/doc/man/Makefile
/include/Makefile
/src/common/Makefile
-/src/liblttng-ust-comm/Makefile
/src/lib/lttng-ust-ctl/Makefile
/src/lib/lttng-ust-cyg-profile/Makefile
/src/lib/lttng-ust-dl/Makefile
doc/man/Makefile
include/Makefile
src/common/Makefile
- src/liblttng-ust-comm/Makefile
src/lib/lttng-ust-ctl/Makefile
src/lib/lttng-ust-cyg-profile/Makefile
src/lib/lttng-ust-dl/Makefile
SUBDIRS = \
common \
- liblttng-ust-comm \
liblttng-ust \
lib
logging.h \
macros.h \
patient.h \
- safe-snprintf.h \
- ustcomm.h
+ safe-snprintf.h
noinst_HEADERS += \
compat/dlfcn.h \
msgpack/libmsgpack.la \
libringbuffer.la \
snprintf/libsnprintf.la \
- libcommon.la
+ libcommon.la \
+ libustcomm.la
# counter
libcounter_la_SOURCES = \
msgpack/libmsgpack.la \
snprintf/libsnprintf.la
+libustcomm_la_SOURCES = \
+ ustcomm.c \
+ ustcomm.h
+
EXTRA_DIST = snprintf/README
--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <lttng/ust-ctl.h>
+#include "common/ustcomm.h"
+#include "common/ust-fd.h"
+#include "common/macros.h"
+#include <lttng/ust-error.h>
+#include "common/dynamic-type.h"
+#include "common/logging.h"
+
+#include "../liblttng-ust/ust-events-internal.h"
+#include "../liblttng-ust/compat.h"
+
+#define USTCOMM_CODE_OFFSET(code) \
+ (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1))
+
+#define USTCOMM_MAX_SEND_FDS 4
+
+static
+ssize_t count_fields_recursive(size_t nr_fields,
+ const struct lttng_ust_event_field **lttng_fields);
+static
+int serialize_one_field(struct lttng_ust_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const struct lttng_ust_event_field *lf);
+static
+int serialize_fields(struct lttng_ust_session *session,
+ struct ustctl_field *ustctl_fields,
+ size_t *iter_output, size_t nr_lttng_fields,
+ const struct lttng_ust_event_field **lttng_fields);
+
+/*
+ * Human readable error message.
+ */
+static const char *ustcomm_readable_code[] = {
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK) ] = "Success",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting",
+
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED) ] = "Cannot get unix socket peer credentials",
+ [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED_PID) ] = "Peer credentials PID is invalid. Socket appears to belong to a distinct, non-nested pid namespace.",
+};
+
+/*
+ * lttng_ust_strerror
+ * @code: must be a negative value of enum lttng_ust_error_code (or 0).
+ *
+ * Returns a ptr to a string representing a human readable error code from the
+ * ustcomm_return_code enum.
+ */
+const char *lttng_ust_strerror(int code)
+{
+ code = -code;
+
+ if (code < LTTNG_UST_OK || code >= LTTNG_UST_ERR_NR)
+ code = LTTNG_UST_ERR;
+
+ return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)];
+}
+
+/*
+ * ustcomm_connect_unix_sock
+ *
+ * Connect to unix socket using the path name.
+ *
+ * Caller handles FD tracker.
+ */
+int ustcomm_connect_unix_sock(const char *pathname, long timeout)
+{
+ struct sockaddr_un sun;
+ int fd, ret;
+
+ /*
+ * libust threads require the close-on-exec flag for all
+ * resources so it does not leak file descriptors upon exec.
+ * SOCK_CLOEXEC is not used since it is linux specific.
+ */
+ fd = socket(PF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0) {
+ PERROR("socket");
+ ret = -errno;
+ goto error;
+ }
+ if (timeout >= 0) {
+ /* Give at least 10ms. */
+ if (timeout < 10)
+ timeout = 10;
+ ret = ustcomm_setsockopt_snd_timeout(fd, timeout);
+ if (ret < 0) {
+ WARN("Error setting connect socket send timeout");
+ }
+ }
+ ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
+ if (ret < 0) {
+ PERROR("fcntl");
+ ret = -errno;
+ goto error_fcntl;
+ }
+
+ memset(&sun, 0, sizeof(sun));
+ sun.sun_family = AF_UNIX;
+ strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
+ sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
+
+ ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
+ if (ret < 0) {
+ /*
+ * Don't print message on connect ENOENT error, because
+ * connect is used in normal execution to detect if
+ * sessiond is alive. ENOENT is when the unix socket
+ * file does not exist, and ECONNREFUSED is when the
+ * file exists but no sessiond is listening.
+ */
+ if (errno != ECONNREFUSED && errno != ECONNRESET
+ && errno != ENOENT && errno != EACCES)
+ PERROR("connect");
+ ret = -errno;
+ if (ret == -ECONNREFUSED || ret == -ECONNRESET)
+ ret = -EPIPE;
+ goto error_connect;
+ }
+
+ return fd;
+
+error_connect:
+error_fcntl:
+ {
+ int closeret;
+
+ closeret = close(fd);
+ if (closeret)
+ PERROR("close");
+ }
+error:
+ return ret;
+}
+
+/*
+ * ustcomm_accept_unix_sock
+ *
+ * Do an accept(2) on the sock and return the
+ * new file descriptor. The socket MUST be bind(2) before.
+ */
+int ustcomm_accept_unix_sock(int sock)
+{
+ int new_fd;
+ struct sockaddr_un sun;
+ socklen_t len = 0;
+
+ /* Blocking call */
+ new_fd = accept(sock, (struct sockaddr *) &sun, &len);
+ if (new_fd < 0) {
+ if (errno != ECONNABORTED)
+ PERROR("accept");
+ new_fd = -errno;
+ if (new_fd == -ECONNABORTED)
+ new_fd = -EPIPE;
+ }
+ return new_fd;
+}
+
+/*
+ * ustcomm_create_unix_sock
+ *
+ * Creates a AF_UNIX local socket using pathname
+ * bind the socket upon creation and return the fd.
+ */
+int ustcomm_create_unix_sock(const char *pathname)
+{
+ struct sockaddr_un sun;
+ int fd, ret;
+
+ /* Create server socket */
+ if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
+ PERROR("socket");
+ ret = -errno;
+ goto error;
+ }
+
+ memset(&sun, 0, sizeof(sun));
+ sun.sun_family = AF_UNIX;
+ strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
+ sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
+
+ /* Unlink the old file if present */
+ (void) unlink(pathname);
+ ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
+ if (ret < 0) {
+ PERROR("bind");
+ ret = -errno;
+ goto error_close;
+ }
+
+ return fd;
+
+error_close:
+ {
+ int closeret;
+
+ closeret = close(fd);
+ if (closeret) {
+ PERROR("close");
+ }
+ }
+error:
+ return ret;
+}
+
+/*
+ * ustcomm_listen_unix_sock
+ *
+ * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
+ */
+int ustcomm_listen_unix_sock(int sock)
+{
+ int ret;
+
+ ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN);
+ if (ret < 0) {
+ ret = -errno;
+ PERROR("listen");
+ }
+
+ return ret;
+}
+
+/*
+ * ustcomm_close_unix_sock
+ *
+ * Shutdown cleanly a unix socket.
+ *
+ * Handles fd tracker internally.
+ */
+int ustcomm_close_unix_sock(int sock)
+{
+ int ret;
+
+ lttng_ust_lock_fd_tracker();
+ ret = close(sock);
+ if (!ret) {
+ lttng_ust_delete_fd_from_tracker(sock);
+ } else {
+ PERROR("close");
+ ret = -errno;
+ }
+ lttng_ust_unlock_fd_tracker();
+
+ return ret;
+}
+
+/*
+ * ustcomm_recv_unix_sock
+ *
+ * Receive data of size len in put that data into
+ * the buf param. Using recvmsg API.
+ * Return the size of received data.
+ * Return 0 on orderly shutdown.
+ */
+ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+ ssize_t ret = -1;
+ size_t len_last;
+
+ memset(&msg, 0, sizeof(msg));
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = len;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ do {
+ len_last = iov[0].iov_len;
+ ret = recvmsg(sock, &msg, 0);
+ if (ret > 0) {
+ iov[0].iov_base += ret;
+ iov[0].iov_len -= ret;
+ assert(ret <= len_last);
+ }
+ } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
+
+ if (ret < 0) {
+ int shutret;
+
+ if (errno != EPIPE && errno != ECONNRESET && errno != ECONNREFUSED)
+ PERROR("recvmsg");
+ ret = -errno;
+ if (ret == -ECONNRESET || ret == -ECONNREFUSED)
+ ret = -EPIPE;
+
+ shutret = shutdown(sock, SHUT_RDWR);
+ if (shutret)
+ ERR("Socket shutdown error");
+ } else if (ret > 0) {
+ ret = len;
+ }
+ /* ret = 0 means an orderly shutdown. */
+
+ return ret;
+}
+
+/*
+ * ustcomm_send_unix_sock
+ *
+ * Send buf data of size len. Using sendmsg API.
+ * Return the size of sent data.
+ */
+ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+ ssize_t ret;
+
+ memset(&msg, 0, sizeof(msg));
+
+ iov[0].iov_base = (void *) buf;
+ iov[0].iov_len = len;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ /*
+ * Using the MSG_NOSIGNAL when sending data from sessiond to
+ * libust, so libust does not receive an unhandled SIGPIPE or
+ * SIGURG. The sessiond receiver side can be made more resilient
+ * by ignoring SIGPIPE, but we don't have this luxury on the
+ * libust side.
+ */
+ do {
+ ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
+ } while (ret < 0 && errno == EINTR);
+
+ if (ret < 0) {
+ int shutret;
+
+ if (errno != EPIPE && errno != ECONNRESET)
+ PERROR("sendmsg");
+ ret = -errno;
+ if (ret == -ECONNRESET)
+ ret = -EPIPE;
+
+ shutret = shutdown(sock, SHUT_RDWR);
+ if (shutret)
+ ERR("Socket shutdown error");
+ }
+
+ return ret;
+}
+
+/*
+ * Send a message accompanied by fd(s) over a unix socket.
+ *
+ * Returns the size of data sent, or negative error value.
+ */
+ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
+{
+ struct msghdr msg;
+ struct cmsghdr *cmptr;
+ struct iovec iov[1];
+ ssize_t ret = -1;
+ unsigned int sizeof_fds = nb_fd * sizeof(int);
+ char tmp[CMSG_SPACE(sizeof_fds)];
+ char dummy = 0;
+
+ memset(&msg, 0, sizeof(msg));
+ memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char));
+
+ if (nb_fd > USTCOMM_MAX_SEND_FDS)
+ return -EINVAL;
+
+ msg.msg_control = (caddr_t)tmp;
+ msg.msg_controllen = CMSG_LEN(sizeof_fds);
+
+ cmptr = CMSG_FIRSTHDR(&msg);
+ if (!cmptr)
+ return -EINVAL;
+ cmptr->cmsg_level = SOL_SOCKET;
+ cmptr->cmsg_type = SCM_RIGHTS;
+ cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
+ memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
+ /* Sum of the length of all control messages in the buffer: */
+ msg.msg_controllen = cmptr->cmsg_len;
+
+ iov[0].iov_base = &dummy;
+ iov[0].iov_len = 1;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ do {
+ ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ /*
+ * We consider EPIPE and ECONNRESET as expected.
+ */
+ if (errno != EPIPE && errno != ECONNRESET) {
+ PERROR("sendmsg");
+ }
+ ret = -errno;
+ if (ret == -ECONNRESET)
+ ret = -EPIPE;
+ }
+ return ret;
+}
+
+/*
+ * Recv a message accompanied by fd(s) from a unix socket.
+ *
+ * Expect at most "nb_fd" file descriptors. Returns the number of fd
+ * actually received in nb_fd.
+ * Returns -EPIPE on orderly shutdown.
+ */
+ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
+{
+ struct iovec iov[1];
+ ssize_t ret = 0;
+ struct cmsghdr *cmsg;
+ size_t sizeof_fds = nb_fd * sizeof(int);
+ char recv_fd[CMSG_SPACE(sizeof_fds)];
+ struct msghdr msg;
+ char dummy;
+ int i;
+
+ memset(&msg, 0, sizeof(msg));
+
+ /* Prepare to receive the structures */
+ iov[0].iov_base = &dummy;
+ iov[0].iov_len = 1;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = recv_fd;
+ msg.msg_controllen = sizeof(recv_fd);
+
+ do {
+ ret = recvmsg(sock, &msg, 0);
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ if (errno != EPIPE && errno != ECONNRESET) {
+ PERROR("recvmsg fds");
+ }
+ ret = -errno;
+ if (ret == -ECONNRESET)
+ ret = -EPIPE;
+ goto end;
+ }
+ if (ret == 0) {
+ /* orderly shutdown */
+ ret = -EPIPE;
+ goto end;
+ }
+ if (ret != 1) {
+ ERR("Error: Received %zd bytes, expected %d\n",
+ ret, 1);
+ goto end;
+ }
+ if (msg.msg_flags & MSG_CTRUNC) {
+ ERR("Error: Control message truncated.\n");
+ ret = -1;
+ goto end;
+ }
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ ERR("Error: Invalid control message header\n");
+ ret = -1;
+ goto end;
+ }
+ if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
+ ERR("Didn't received any fd\n");
+ ret = -1;
+ goto end;
+ }
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
+ ERR("Error: Received %zu bytes of ancillary data, expected %zu\n",
+ (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds));
+ ret = -1;
+ goto end;
+ }
+
+ memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
+
+ /* Set FD_CLOEXEC */
+ for (i = 0; i < nb_fd; i++) {
+ ret = fcntl(fds[i], F_SETFD, FD_CLOEXEC);
+ if (ret < 0) {
+ PERROR("fcntl failed to set FD_CLOEXEC on fd %d",
+ fds[i]);
+ }
+ }
+
+ ret = nb_fd;
+end:
+ return ret;
+}
+
+int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum)
+{
+ ssize_t len;
+
+ len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum));
+ switch (len) {
+ case sizeof(*lum):
+ break;
+ default:
+ if (len < 0) {
+ return len;
+ } else {
+ ERR("incorrect message size: %zd\n", len);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
+ uint32_t expected_handle, uint32_t expected_cmd)
+{
+ ssize_t len;
+
+ memset(lur, 0, sizeof(*lur));
+ len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur));
+ switch (len) {
+ case 0: /* orderly shutdown */
+ return -EPIPE;
+ case sizeof(*lur):
+ {
+ int err = 0;
+
+ if (lur->handle != expected_handle) {
+ ERR("Unexpected result message handle: "
+ "expected: %u vs received: %u\n",
+ expected_handle, lur->handle);
+ err = 1;
+ }
+ if (lur->cmd != expected_cmd) {
+ ERR("Unexpected result message command "
+ "expected: %u vs received: %u\n",
+ expected_cmd, lur->cmd);
+ err = 1;
+ }
+ if (err) {
+ return -EINVAL;
+ } else {
+ return lur->ret_code;
+ }
+ }
+ default:
+ if (len >= 0) {
+ ERR("incorrect message size: %zd\n", len);
+ }
+ return len;
+ }
+}
+
+int ustcomm_send_app_cmd(int sock,
+ struct ustcomm_ust_msg *lum,
+ struct ustcomm_ust_reply *lur)
+{
+ int ret;
+
+ ret = ustcomm_send_app_msg(sock, lum);
+ if (ret)
+ return ret;
+ ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd);
+ if (ret > 0)
+ return -EIO;
+ return ret;
+}
+
+/*
+ * chan_data is allocated internally if this function returns the
+ * expected var_len.
+ */
+ssize_t ustcomm_recv_channel_from_sessiond(int sock,
+ void **_chan_data, uint64_t var_len,
+ int *_wakeup_fd)
+{
+ void *chan_data;
+ ssize_t len, nr_fd;
+ int wakeup_fd, ret;
+
+ if (var_len > LTTNG_UST_ABI_CHANNEL_DATA_MAX_LEN) {
+ len = -EINVAL;
+ goto error_check;
+ }
+ /* Receive variable length data */
+ chan_data = zmalloc(var_len);
+ if (!chan_data) {
+ len = -ENOMEM;
+ goto error_alloc;
+ }
+ len = ustcomm_recv_unix_sock(sock, chan_data, var_len);
+ if (len != var_len) {
+ goto error_recv;
+ }
+ /* recv wakeup fd */
+ lttng_ust_lock_fd_tracker();
+ nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1);
+ if (nr_fd <= 0) {
+ lttng_ust_unlock_fd_tracker();
+ if (nr_fd < 0) {
+ len = nr_fd;
+ goto error_recv;
+ } else {
+ len = -EIO;
+ goto error_recv;
+ }
+ }
+
+ ret = lttng_ust_add_fd_to_tracker(wakeup_fd);
+ if (ret < 0) {
+ ret = close(wakeup_fd);
+ if (ret) {
+ PERROR("close on wakeup_fd");
+ }
+ len = -EIO;
+ lttng_ust_unlock_fd_tracker();
+ goto error_recv;
+ }
+
+ *_wakeup_fd = ret;
+ lttng_ust_unlock_fd_tracker();
+
+ *_chan_data = chan_data;
+ return len;
+
+error_recv:
+ free(chan_data);
+error_alloc:
+error_check:
+ return len;
+}
+
+ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock,
+ int *_event_notifier_notif_fd)
+{
+ ssize_t nr_fd;
+ int event_notifier_notif_fd, ret;
+
+ /* Receive event_notifier notification fd */
+ lttng_ust_lock_fd_tracker();
+ nr_fd = ustcomm_recv_fds_unix_sock(sock, &event_notifier_notif_fd, 1);
+ if (nr_fd <= 0) {
+ lttng_ust_unlock_fd_tracker();
+ if (nr_fd < 0) {
+ ret = nr_fd;
+ goto error;
+ } else {
+ ret = -EIO;
+ goto error;
+ }
+ }
+
+ ret = lttng_ust_add_fd_to_tracker(event_notifier_notif_fd);
+ if (ret < 0) {
+ ret = close(event_notifier_notif_fd);
+ if (ret) {
+ PERROR("close on event_notifier notif fd");
+ }
+ ret = -EIO;
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+
+ *_event_notifier_notif_fd = ret;
+ lttng_ust_unlock_fd_tracker();
+
+ ret = nr_fd;
+
+error:
+ return ret;
+}
+
+int ustcomm_recv_stream_from_sessiond(int sock,
+ uint64_t *memory_map_size __attribute__((unused)),
+ int *shm_fd, int *wakeup_fd)
+{
+ ssize_t len;
+ int ret;
+ int fds[2];
+
+ /* recv shm fd and wakeup fd */
+ lttng_ust_lock_fd_tracker();
+ len = ustcomm_recv_fds_unix_sock(sock, fds, 2);
+ if (len <= 0) {
+ lttng_ust_unlock_fd_tracker();
+ if (len < 0) {
+ ret = len;
+ goto error;
+ } else {
+ ret = -EIO;
+ goto error;
+ }
+ }
+
+ ret = lttng_ust_add_fd_to_tracker(fds[0]);
+ if (ret < 0) {
+ ret = close(fds[0]);
+ if (ret) {
+ PERROR("close on received shm_fd");
+ }
+ ret = -EIO;
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+ *shm_fd = ret;
+
+ ret = lttng_ust_add_fd_to_tracker(fds[1]);
+ if (ret < 0) {
+ ret = close(*shm_fd);
+ if (ret) {
+ PERROR("close on shm_fd");
+ }
+ *shm_fd = -1;
+ ret = close(fds[1]);
+ if (ret) {
+ PERROR("close on received wakeup_fd");
+ }
+ ret = -EIO;
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+ *wakeup_fd = ret;
+ lttng_ust_unlock_fd_tracker();
+ return 0;
+
+error:
+ return ret;
+}
+
+ssize_t ustcomm_recv_counter_from_sessiond(int sock,
+ void **_counter_data, uint64_t var_len)
+{
+ void *counter_data;
+ ssize_t len;
+
+ if (var_len > LTTNG_UST_ABI_COUNTER_DATA_MAX_LEN) {
+ len = -EINVAL;
+ goto error_check;
+ }
+ /* Receive variable length data */
+ counter_data = zmalloc(var_len);
+ if (!counter_data) {
+ len = -ENOMEM;
+ goto error_alloc;
+ }
+ len = ustcomm_recv_unix_sock(sock, counter_data, var_len);
+ if (len != var_len) {
+ goto error_recv;
+ }
+ *_counter_data = counter_data;
+ return len;
+
+error_recv:
+ free(counter_data);
+error_alloc:
+error_check:
+ return len;
+}
+
+int ustcomm_recv_counter_shm_from_sessiond(int sock,
+ int *shm_fd)
+{
+ ssize_t len;
+ int ret;
+ int fds[1];
+
+ /* recv shm fd fd */
+ lttng_ust_lock_fd_tracker();
+ len = ustcomm_recv_fds_unix_sock(sock, fds, 1);
+ if (len <= 0) {
+ lttng_ust_unlock_fd_tracker();
+ if (len < 0) {
+ ret = len;
+ goto error;
+ } else {
+ ret = -EIO;
+ goto error;
+ }
+ }
+
+ ret = lttng_ust_add_fd_to_tracker(fds[0]);
+ if (ret < 0) {
+ ret = close(fds[0]);
+ if (ret) {
+ PERROR("close on received shm_fd");
+ }
+ ret = -EIO;
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+ *shm_fd = ret;
+ lttng_ust_unlock_fd_tracker();
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Returns 0 on success, negative error value on error.
+ */
+int ustcomm_send_reg_msg(int sock,
+ enum ustctl_socket_type type,
+ uint32_t bits_per_long,
+ uint32_t uint8_t_alignment,
+ uint32_t uint16_t_alignment,
+ uint32_t uint32_t_alignment,
+ uint32_t uint64_t_alignment,
+ uint32_t long_alignment)
+{
+ ssize_t len;
+ struct ustctl_reg_msg reg_msg;
+
+ reg_msg.magic = LTTNG_UST_ABI_COMM_MAGIC;
+ reg_msg.major = LTTNG_UST_ABI_MAJOR_VERSION;
+ reg_msg.minor = LTTNG_UST_ABI_MINOR_VERSION;
+ reg_msg.pid = getpid();
+ reg_msg.ppid = getppid();
+ reg_msg.uid = getuid();
+ reg_msg.gid = getgid();
+ reg_msg.bits_per_long = bits_per_long;
+ reg_msg.uint8_t_alignment = uint8_t_alignment;
+ reg_msg.uint16_t_alignment = uint16_t_alignment;
+ reg_msg.uint32_t_alignment = uint32_t_alignment;
+ reg_msg.uint64_t_alignment = uint64_t_alignment;
+ reg_msg.long_alignment = long_alignment;
+ reg_msg.socket_type = type;
+ lttng_pthread_getname_np(reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN);
+ memset(reg_msg.padding, 0, sizeof(reg_msg.padding));
+
+ len = ustcomm_send_unix_sock(sock, ®_msg, sizeof(reg_msg));
+ if (len > 0 && len != sizeof(reg_msg))
+ return -EIO;
+ if (len < 0)
+ return len;
+ return 0;
+}
+
+static
+ssize_t count_one_type(const struct lttng_ust_type_common *lt)
+{
+ switch (lt->type) {
+ case lttng_ust_type_integer:
+ case lttng_ust_type_float:
+ case lttng_ust_type_string:
+ return 1;
+ case lttng_ust_type_enum:
+ return count_one_type(lttng_ust_get_type_enum(lt)->container_type) + 1;
+ case lttng_ust_type_array:
+ return count_one_type(lttng_ust_get_type_array(lt)->elem_type) + 1;
+ case lttng_ust_type_sequence:
+ return count_one_type(lttng_ust_get_type_sequence(lt)->elem_type) + 1;
+ case lttng_ust_type_struct:
+ return count_fields_recursive(lttng_ust_get_type_struct(lt)->nr_fields,
+ lttng_ust_get_type_struct(lt)->fields) + 1;
+
+ case lttng_ust_type_dynamic:
+ {
+ const struct lttng_ust_event_field **choices;
+ size_t nr_choices;
+ int ret;
+
+ ret = lttng_ust_dynamic_type_choices(&nr_choices,
+ &choices);
+ if (ret)
+ return ret;
+ /*
+ * Two fields for enum, one field for variant, and
+ * one field per choice.
+ */
+ return count_fields_recursive(nr_choices, choices) + 3;
+ }
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+ssize_t count_fields_recursive(size_t nr_fields,
+ const struct lttng_ust_event_field **lttng_fields)
+{
+ int i;
+ ssize_t ret, count = 0;
+
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_ust_event_field *lf;
+
+ lf = lttng_fields[i];
+ /* skip 'nowrite' fields */
+ if (lf->nowrite)
+ continue;
+ ret = count_one_type(lf->type);
+ if (ret < 0)
+ return ret; /* error */
+ count += ret;
+ }
+ return count;
+}
+
+static
+ssize_t count_ctx_fields_recursive(size_t nr_fields,
+ struct lttng_ust_ctx_field *lttng_fields)
+{
+ int i;
+ ssize_t ret, count = 0;
+
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_ust_event_field *lf;
+
+ lf = lttng_fields[i].event_field;
+ /* skip 'nowrite' fields */
+ if (lf->nowrite)
+ continue;
+ ret = count_one_type(lf->type);
+ if (ret < 0)
+ return ret; /* error */
+ count += ret;
+ }
+ return count;
+}
+
+static
+int serialize_string_encoding(int32_t *ue,
+ enum lttng_ust_string_encoding le)
+{
+ switch (le) {
+ case lttng_ust_string_encoding_none:
+ *ue = ustctl_encode_none;
+ break;
+ case lttng_ust_string_encoding_UTF8:
+ *ue = ustctl_encode_UTF8;
+ break;
+ case lttng_ust_string_encoding_ASCII:
+ *ue = ustctl_encode_ASCII;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+int serialize_integer_type(struct ustctl_integer_type *uit,
+ const struct lttng_ust_type_integer *lit,
+ enum lttng_ust_string_encoding lencoding)
+{
+ int32_t encoding;
+
+ uit->size = lit->size;
+ uit->signedness = lit->signedness;
+ uit->reverse_byte_order = lit->reverse_byte_order;
+ uit->base = lit->base;
+ if (serialize_string_encoding(&encoding, lencoding))
+ return -EINVAL;
+ uit->encoding = encoding;
+ uit->alignment = lit->alignment;
+ return 0;
+}
+
+static
+int serialize_dynamic_type(struct lttng_ust_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const char *field_name)
+{
+ const struct lttng_ust_event_field **choices;
+ char tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ const struct lttng_ust_type_common *tag_type;
+ const struct lttng_ust_event_field *tag_field_generic;
+ struct lttng_ust_event_field tag_field = {
+ .name = tag_field_name,
+ .nowrite = 0,
+ };
+ struct ustctl_field *uf;
+ size_t nr_choices, i;
+ int ret;
+
+ tag_field_generic = lttng_ust_dynamic_type_tag_field();
+ tag_type = tag_field_generic->type;
+
+ /* Serialize enum field. */
+ strncpy(tag_field_name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ strncat(tag_field_name,
+ "_tag",
+ LTTNG_UST_ABI_SYM_NAME_LEN - strlen(tag_field_name) - 1);
+ tag_field.type = tag_type;
+ ret = serialize_one_field(session, fields, iter_output,
+ &tag_field);
+ if (ret)
+ return ret;
+
+ /* Serialize variant field. */
+ uf = &fields[*iter_output];
+ ret = lttng_ust_dynamic_type_choices(&nr_choices, &choices);
+ if (ret)
+ return ret;
+
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ uf->type.atype = ustctl_atype_variant;
+ uf->type.u.variant_nestable.nr_choices = nr_choices;
+ strncpy(uf->type.u.variant_nestable.tag_name,
+ tag_field_name,
+ LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->type.u.variant_nestable.tag_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ uf->type.u.variant_nestable.alignment = 0;
+ (*iter_output)++;
+
+ /* Serialize choice fields after variant. */
+ for (i = 0; i < nr_choices; i++) {
+ ret = serialize_one_field(session, fields,
+ iter_output, choices[i]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static
+int serialize_one_type(struct lttng_ust_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const char *field_name, const struct lttng_ust_type_common *lt,
+ enum lttng_ust_string_encoding parent_encoding)
+{
+ int ret;
+
+ /*
+ * Serializing a type (rather than a field) generates a ustctl_field
+ * entry with 0-length name.
+ */
+
+ switch (lt->type) {
+ case lttng_ust_type_integer:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ ret = serialize_integer_type(&ut->u.integer, lttng_ust_get_type_integer(lt),
+ parent_encoding);
+ if (ret)
+ return ret;
+ ut->atype = ustctl_atype_integer;
+ (*iter_output)++;
+ break;
+ }
+ case lttng_ust_type_float:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+ struct ustctl_float_type *uft;
+ const struct lttng_ust_type_float *lft;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ uft = &ut->u._float;
+ lft = lttng_ust_get_type_float(lt);
+ uft->exp_dig = lft->exp_dig;
+ uft->mant_dig = lft->mant_dig;
+ uft->alignment = lft->alignment;
+ uft->reverse_byte_order = lft->reverse_byte_order;
+ ut->atype = ustctl_atype_float;
+ (*iter_output)++;
+ break;
+ }
+ case lttng_ust_type_string:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+ int32_t encoding;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ ret = serialize_string_encoding(&encoding, lttng_ust_get_type_string(lt)->encoding);
+ if (ret)
+ return ret;
+ ut->u.string.encoding = encoding;
+ ut->atype = ustctl_atype_string;
+ (*iter_output)++;
+ break;
+ }
+ case lttng_ust_type_array:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ ut->atype = ustctl_atype_array_nestable;
+ ut->u.array_nestable.length = lttng_ust_get_type_array(lt)->length;
+ ut->u.array_nestable.alignment = lttng_ust_get_type_array(lt)->alignment;
+ (*iter_output)++;
+
+ ret = serialize_one_type(session, fields, iter_output, NULL,
+ lttng_ust_get_type_array(lt)->elem_type,
+ lttng_ust_get_type_array(lt)->encoding);
+ if (ret)
+ return -EINVAL;
+ break;
+ }
+ case lttng_ust_type_sequence:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ ut->atype = ustctl_atype_sequence_nestable;
+ strncpy(ut->u.sequence_nestable.length_name,
+ lttng_ust_get_type_sequence(lt)->length_name,
+ LTTNG_UST_ABI_SYM_NAME_LEN);
+ ut->u.sequence_nestable.length_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ ut->u.sequence_nestable.alignment = lttng_ust_get_type_sequence(lt)->alignment;
+ (*iter_output)++;
+
+ ret = serialize_one_type(session, fields, iter_output, NULL,
+ lttng_ust_get_type_sequence(lt)->elem_type,
+ lttng_ust_get_type_sequence(lt)->encoding);
+ if (ret)
+ return -EINVAL;
+ break;
+ }
+ case lttng_ust_type_dynamic:
+ {
+ ret = serialize_dynamic_type(session, fields, iter_output,
+ field_name);
+ if (ret)
+ return -EINVAL;
+ break;
+ }
+ case lttng_ust_type_struct:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ uf->type.atype = ustctl_atype_struct_nestable;
+ uf->type.u.struct_nestable.nr_fields = lttng_ust_get_type_struct(lt)->nr_fields;
+ uf->type.u.struct_nestable.alignment = lttng_ust_get_type_struct(lt)->alignment;
+ (*iter_output)++;
+
+ ret = serialize_fields(session, fields, iter_output,
+ lttng_ust_get_type_struct(lt)->nr_fields,
+ lttng_ust_get_type_struct(lt)->fields);
+ if (ret)
+ return -EINVAL;
+ break;
+ }
+ case lttng_ust_type_enum:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+
+ if (field_name) {
+ strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ } else {
+ uf->name[0] = '\0';
+ }
+ strncpy(ut->u.enum_nestable.name, lttng_ust_get_type_enum(lt)->desc->name,
+ LTTNG_UST_ABI_SYM_NAME_LEN);
+ ut->u.enum_nestable.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ ut->atype = ustctl_atype_enum_nestable;
+ (*iter_output)++;
+
+ ret = serialize_one_type(session, fields, iter_output, NULL,
+ lttng_ust_get_type_enum(lt)->container_type,
+ lttng_ust_string_encoding_none);
+ if (ret)
+ return -EINVAL;
+ if (session) {
+ const struct lttng_enum *_enum;
+
+ _enum = lttng_ust_enum_get_from_desc(session, lttng_ust_get_type_enum(lt)->desc);
+ if (!_enum)
+ return -EINVAL;
+ ut->u.enum_nestable.id = _enum->id;
+ } else {
+ ut->u.enum_nestable.id = -1ULL;
+ }
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+int serialize_one_field(struct lttng_ust_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const struct lttng_ust_event_field *lf)
+{
+ /* skip 'nowrite' fields */
+ if (lf->nowrite)
+ return 0;
+
+ return serialize_one_type(session, fields, iter_output, lf->name, lf->type, lttng_ust_string_encoding_none);
+}
+
+static
+int serialize_fields(struct lttng_ust_session *session,
+ struct ustctl_field *ustctl_fields,
+ size_t *iter_output, size_t nr_lttng_fields,
+ const struct lttng_ust_event_field **lttng_fields)
+{
+ int ret;
+ size_t i;
+
+ for (i = 0; i < nr_lttng_fields; i++) {
+ ret = serialize_one_field(session, ustctl_fields,
+ iter_output, lttng_fields[i]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static
+int alloc_serialize_fields(struct lttng_ust_session *session,
+ size_t *_nr_write_fields,
+ struct ustctl_field **ustctl_fields,
+ size_t nr_fields,
+ const struct lttng_ust_event_field **lttng_fields)
+{
+ struct ustctl_field *fields;
+ int ret;
+ size_t iter_output = 0;
+ ssize_t nr_write_fields;
+
+ nr_write_fields = count_fields_recursive(nr_fields, lttng_fields);
+ if (nr_write_fields < 0) {
+ return (int) nr_write_fields;
+ }
+
+ fields = zmalloc(nr_write_fields * sizeof(*fields));
+ if (!fields)
+ return -ENOMEM;
+
+ ret = serialize_fields(session, fields, &iter_output, nr_fields,
+ lttng_fields);
+ if (ret)
+ goto error_type;
+
+ *_nr_write_fields = nr_write_fields;
+ *ustctl_fields = fields;
+ return 0;
+
+error_type:
+ free(fields);
+ return ret;
+}
+
+static
+int serialize_entries(struct ustctl_enum_entry **_entries,
+ size_t nr_entries,
+ const struct lttng_ust_enum_entry **lttng_entries)
+{
+ struct ustctl_enum_entry *entries;
+ int i;
+
+ /* Serialize the entries */
+ entries = zmalloc(nr_entries * sizeof(*entries));
+ if (!entries)
+ return -ENOMEM;
+ for (i = 0; i < nr_entries; i++) {
+ struct ustctl_enum_entry *uentry;
+ const struct lttng_ust_enum_entry *lentry;
+
+ uentry = &entries[i];
+ lentry = lttng_entries[i];
+
+ uentry->start.value = lentry->start.value;
+ uentry->start.signedness = lentry->start.signedness;
+ uentry->end.value = lentry->end.value;
+ uentry->end.signedness = lentry->end.signedness;
+ strncpy(uentry->string, lentry->string, LTTNG_UST_ABI_SYM_NAME_LEN);
+ uentry->string[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+
+ if (lentry->options & LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO) {
+ uentry->u.extra.options |=
+ USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO;
+ }
+ }
+ *_entries = entries;
+ return 0;
+}
+
+static
+int serialize_ctx_fields(struct lttng_ust_session *session,
+ size_t *_nr_write_fields,
+ struct ustctl_field **ustctl_fields,
+ size_t nr_fields,
+ struct lttng_ust_ctx_field *lttng_fields)
+{
+ struct ustctl_field *fields;
+ int ret;
+ size_t i, iter_output = 0;
+ ssize_t nr_write_fields;
+
+ nr_write_fields = count_ctx_fields_recursive(nr_fields,
+ lttng_fields);
+ if (nr_write_fields < 0) {
+ return (int) nr_write_fields;
+ }
+
+ fields = zmalloc(nr_write_fields * sizeof(*fields));
+ if (!fields)
+ return -ENOMEM;
+
+ for (i = 0; i < nr_fields; i++) {
+ ret = serialize_one_field(session, fields, &iter_output,
+ lttng_fields[i].event_field);
+ if (ret)
+ goto error_type;
+ }
+
+ *_nr_write_fields = nr_write_fields;
+ *ustctl_fields = fields;
+ return 0;
+
+error_type:
+ free(fields);
+ return ret;
+}
+
+/*
+ * Returns 0 on success, negative error value on error.
+ */
+int ustcomm_register_event(int sock,
+ struct lttng_ust_session *session,
+ int session_objd, /* session descriptor */
+ int channel_objd, /* channel descriptor */
+ const char *event_name, /* event name (input) */
+ int loglevel,
+ const char *signature, /* event signature (input) */
+ size_t nr_fields, /* fields */
+ const struct lttng_ust_event_field **lttng_fields,
+ const char *model_emf_uri,
+ uint32_t *id) /* event id (output) */
+{
+ ssize_t len;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_event_msg m;
+ } msg;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_event_reply r;
+ } reply;
+ size_t signature_len, fields_len, model_emf_uri_len;
+ struct ustctl_field *fields = NULL;
+ size_t nr_write_fields = 0;
+ int ret;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.header.notify_cmd = USTCTL_NOTIFY_CMD_EVENT;
+ msg.m.session_objd = session_objd;
+ msg.m.channel_objd = channel_objd;
+ strncpy(msg.m.event_name, event_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ msg.m.event_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+ msg.m.loglevel = loglevel;
+ signature_len = strlen(signature) + 1;
+ msg.m.signature_len = signature_len;
+
+ /* Calculate fields len, serialize fields. */
+ if (nr_fields > 0) {
+ ret = alloc_serialize_fields(session, &nr_write_fields, &fields,
+ nr_fields, lttng_fields);
+ if (ret)
+ return ret;
+ }
+
+ fields_len = sizeof(*fields) * nr_write_fields;
+ msg.m.fields_len = fields_len;
+ if (model_emf_uri) {
+ model_emf_uri_len = strlen(model_emf_uri) + 1;
+ } else {
+ model_emf_uri_len = 0;
+ }
+ msg.m.model_emf_uri_len = model_emf_uri_len;
+
+ len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
+ if (len > 0 && len != sizeof(msg)) {
+ ret = -EIO;
+ goto error_fields;
+ }
+ if (len < 0) {
+ ret = len;
+ goto error_fields;
+ }
+
+ /* send signature */
+ len = ustcomm_send_unix_sock(sock, signature, signature_len);
+ if (len > 0 && len != signature_len) {
+ ret = -EIO;
+ goto error_fields;
+ }
+ if (len < 0) {
+ ret = len;
+ goto error_fields;
+ }
+
+ /* send fields */
+ if (fields_len > 0) {
+ len = ustcomm_send_unix_sock(sock, fields, fields_len);
+ if (len > 0 && len != fields_len) {
+ ret = -EIO;
+ goto error_fields;
+ }
+ if (len < 0) {
+ ret = len;
+ goto error_fields;
+ }
+ }
+ free(fields);
+
+ if (model_emf_uri_len) {
+ /* send model_emf_uri */
+ len = ustcomm_send_unix_sock(sock, model_emf_uri,
+ model_emf_uri_len);
+ if (len > 0 && len != model_emf_uri_len) {
+ return -EIO;
+ }
+ if (len < 0) {
+ return len;
+ }
+ }
+
+ /* receive reply */
+ len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
+ switch (len) {
+ case 0: /* orderly shutdown */
+ return -EPIPE;
+ case sizeof(reply):
+ if (reply.header.notify_cmd != msg.header.notify_cmd) {
+ ERR("Unexpected result message command "
+ "expected: %u vs received: %u\n",
+ msg.header.notify_cmd, reply.header.notify_cmd);
+ return -EINVAL;
+ }
+ if (reply.r.ret_code > 0)
+ return -EINVAL;
+ if (reply.r.ret_code < 0)
+ return reply.r.ret_code;
+ *id = reply.r.event_id;
+ DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n",
+ event_name, reply.r.ret_code, reply.r.event_id);
+ return 0;
+ default:
+ if (len < 0) {
+ /* Transport level error */
+ if (errno == EPIPE || errno == ECONNRESET)
+ len = -errno;
+ return len;
+ } else {
+ ERR("incorrect message size: %zd\n", len);
+ return len;
+ }
+ }
+ /* Unreached. */
+
+ /* Error path only. */
+error_fields:
+ free(fields);
+ return ret;
+}
+
+/*
+ * Returns 0 on success, negative error value on error.
+ * Returns -EPIPE or -ECONNRESET if other end has hung up.
+ */
+int ustcomm_register_enum(int sock,
+ int session_objd, /* session descriptor */
+ const char *enum_name, /* enum name (input) */
+ size_t nr_entries, /* entries */
+ const struct lttng_ust_enum_entry **lttng_entries,
+ uint64_t *id)
+{
+ ssize_t len;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_enum_msg m;
+ } msg;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_enum_reply r;
+ } reply;
+ size_t entries_len;
+ struct ustctl_enum_entry *entries = NULL;
+ int ret;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.header.notify_cmd = USTCTL_NOTIFY_CMD_ENUM;
+ msg.m.session_objd = session_objd;
+ strncpy(msg.m.enum_name, enum_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+ msg.m.enum_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
+
+ /* Calculate entries len, serialize entries. */
+ if (nr_entries > 0) {
+ ret = serialize_entries(&entries,
+ nr_entries, lttng_entries);
+ if (ret)
+ return ret;
+ }
+
+ entries_len = sizeof(*entries) * nr_entries;
+ msg.m.entries_len = entries_len;
+
+ len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
+ if (len > 0 && len != sizeof(msg)) {
+ ret = -EIO;
+ goto error_entries;
+ }
+ if (len < 0) {
+ ret = len;
+ goto error_entries;
+ }
+
+ /* send entries */
+ if (entries_len > 0) {
+ len = ustcomm_send_unix_sock(sock, entries, entries_len);
+ if (len > 0 && len != entries_len) {
+ ret = -EIO;
+ goto error_entries;
+ }
+ if (len < 0) {
+ ret = len;
+ goto error_entries;
+ }
+ }
+ free(entries);
+ entries = NULL;
+
+ /* receive reply */
+ len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
+ switch (len) {
+ case 0: /* orderly shutdown */
+ return -EPIPE;
+ case sizeof(reply):
+ if (reply.header.notify_cmd != msg.header.notify_cmd) {
+ ERR("Unexpected result message command "
+ "expected: %u vs received: %u\n",
+ msg.header.notify_cmd, reply.header.notify_cmd);
+ return -EINVAL;
+ }
+ if (reply.r.ret_code > 0)
+ return -EINVAL;
+ if (reply.r.ret_code < 0)
+ return reply.r.ret_code;
+ *id = reply.r.enum_id;
+ DBG("Sent register enum notification for name \"%s\": ret_code %d\n",
+ enum_name, reply.r.ret_code);
+ return 0;
+ default:
+ if (len < 0) {
+ /* Transport level error */
+ if (errno == EPIPE || errno == ECONNRESET)
+ len = -errno;
+ return len;
+ } else {
+ ERR("incorrect message size: %zd\n", len);
+ return len;
+ }
+ }
+ return ret;
+
+error_entries:
+ free(entries);
+ return ret;
+}
+
+/*
+ * Returns 0 on success, negative error value on error.
+ * Returns -EPIPE or -ECONNRESET if other end has hung up.
+ */
+int ustcomm_register_channel(int sock,
+ struct lttng_ust_session *session,
+ int session_objd, /* session descriptor */
+ int channel_objd, /* channel descriptor */
+ size_t nr_ctx_fields,
+ struct lttng_ust_ctx_field *ctx_fields,
+ uint32_t *chan_id, /* channel id (output) */
+ int *header_type) /* header type (output) */
+{
+ ssize_t len;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_channel_msg m;
+ } msg;
+ struct {
+ struct ustcomm_notify_hdr header;
+ struct ustcomm_notify_channel_reply r;
+ } reply;
+ size_t fields_len;
+ struct ustctl_field *fields = NULL;
+ int ret;
+ size_t nr_write_fields = 0;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.header.notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL;
+ msg.m.session_objd = session_objd;
+ msg.m.channel_objd = channel_objd;
+
+ /* Calculate fields len, serialize fields. */
+ if (nr_ctx_fields > 0) {
+ ret = serialize_ctx_fields(session, &nr_write_fields, &fields,
+ nr_ctx_fields, ctx_fields);
+ if (ret)
+ return ret;
+ }
+
+ fields_len = sizeof(*fields) * nr_write_fields;
+ msg.m.ctx_fields_len = fields_len;
+ len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
+ if (len > 0 && len != sizeof(msg)) {
+ free(fields);
+ return -EIO;
+ }
+ if (len < 0) {
+ free(fields);
+ return len;
+ }
+
+ /* send fields */
+ if (fields_len > 0) {
+ len = ustcomm_send_unix_sock(sock, fields, fields_len);
+ free(fields);
+ if (len > 0 && len != fields_len) {
+ return -EIO;
+ }
+ if (len < 0) {
+ return len;
+ }
+ } else {
+ free(fields);
+ }
+
+ len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
+ switch (len) {
+ case 0: /* orderly shutdown */
+ return -EPIPE;
+ case sizeof(reply):
+ if (reply.header.notify_cmd != msg.header.notify_cmd) {
+ ERR("Unexpected result message command "
+ "expected: %u vs received: %u\n",
+ msg.header.notify_cmd, reply.header.notify_cmd);
+ return -EINVAL;
+ }
+ if (reply.r.ret_code > 0)
+ return -EINVAL;
+ if (reply.r.ret_code < 0)
+ return reply.r.ret_code;
+ *chan_id = reply.r.chan_id;
+ switch (reply.r.header_type) {
+ case 1:
+ case 2:
+ *header_type = reply.r.header_type;
+ break;
+ default:
+ ERR("Unexpected channel header type %u\n",
+ reply.r.header_type);
+ return -EINVAL;
+ }
+ DBG("Sent register channel notification: chan_id %d, header_type %d\n",
+ reply.r.chan_id, reply.r.header_type);
+ return 0;
+ default:
+ if (len < 0) {
+ /* Transport level error */
+ if (errno == EPIPE || errno == ECONNRESET)
+ len = -errno;
+ return len;
+ } else {
+ ERR("incorrect message size: %zd\n", len);
+ return len;
+ }
+ }
+}
+
+/*
+ * Set socket reciving timeout.
+ */
+int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec)
+{
+ int ret;
+ struct timeval tv;
+
+ tv.tv_sec = msec / 1000;
+ tv.tv_usec = (msec * 1000 % 1000000);
+
+ ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+ if (ret < 0) {
+ PERROR("setsockopt SO_RCVTIMEO");
+ ret = -errno;
+ }
+
+ return ret;
+}
+
+/*
+ * Set socket sending timeout.
+ */
+int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec)
+{
+ int ret;
+ struct timeval tv;
+
+ tv.tv_sec = msec / 1000;
+ tv.tv_usec = (msec * 1000) % 1000000;
+
+ ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+ if (ret < 0) {
+ PERROR("setsockopt SO_SNDTIMEO");
+ ret = -errno;
+ }
+
+ return ret;
+}
* These declarations should NOT be considered stable API.
*/
-#ifndef _UST_COMMON_USTCOMM_H
-#define _UST_COMMON_USTCOMM_H
+#ifndef _UST_COMMON_UST_COMM_H
+#define _UST_COMMON_UST_COMM_H
#include <stdint.h>
#include <limits.h>
int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec)
__attribute__((visibility("hidden")));
-#endif /* _UST_COMMON_USTCOMM_H */
+#endif /* _UST_COMMON_UST_COMM_H */
liblttng_ust_ctl_la_LIBADD = \
$(top_builddir)/src/liblttng-ust/liblttng-ust-common.la \
- $(top_builddir)/src/liblttng-ust-comm/liblttng-ust-comm.la \
$(top_builddir)/src/liblttng-ust/liblttng-ust-support.la \
+ $(top_builddir)/src/common/libustcomm.la \
$(top_builddir)/src/common/libcommon.la \
$(DL_LIBS)
+++ /dev/null
-# SPDX-License-Identifier: LGPL-2.1-only
-
-noinst_LTLIBRARIES = liblttng-ust-comm.la
-
-liblttng_ust_comm_la_SOURCES = lttng-ust-comm.c
+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#include <limits.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/un.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include <lttng/ust-ctl.h>
-#include "common/ustcomm.h"
-#include "common/ust-fd.h"
-#include "common/macros.h"
-#include <lttng/ust-error.h>
-#include "common/dynamic-type.h"
-#include "common/logging.h"
-
-#include "../liblttng-ust/ust-events-internal.h"
-#include "../liblttng-ust/compat.h"
-
-#define USTCOMM_CODE_OFFSET(code) \
- (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1))
-
-#define USTCOMM_MAX_SEND_FDS 4
-
-static
-ssize_t count_fields_recursive(size_t nr_fields,
- const struct lttng_ust_event_field **lttng_fields);
-static
-int serialize_one_field(struct lttng_ust_session *session,
- struct ustctl_field *fields, size_t *iter_output,
- const struct lttng_ust_event_field *lf);
-static
-int serialize_fields(struct lttng_ust_session *session,
- struct ustctl_field *ustctl_fields,
- size_t *iter_output, size_t nr_lttng_fields,
- const struct lttng_ust_event_field **lttng_fields);
-
-/*
- * Human readable error message.
- */
-static const char *ustcomm_readable_code[] = {
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK) ] = "Success",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting",
-
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED) ] = "Cannot get unix socket peer credentials",
- [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PEERCRED_PID) ] = "Peer credentials PID is invalid. Socket appears to belong to a distinct, non-nested pid namespace.",
-};
-
-/*
- * lttng_ust_strerror
- * @code: must be a negative value of enum lttng_ust_error_code (or 0).
- *
- * Returns a ptr to a string representing a human readable error code from the
- * ustcomm_return_code enum.
- */
-const char *lttng_ust_strerror(int code)
-{
- code = -code;
-
- if (code < LTTNG_UST_OK || code >= LTTNG_UST_ERR_NR)
- code = LTTNG_UST_ERR;
-
- return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)];
-}
-
-/*
- * ustcomm_connect_unix_sock
- *
- * Connect to unix socket using the path name.
- *
- * Caller handles FD tracker.
- */
-int ustcomm_connect_unix_sock(const char *pathname, long timeout)
-{
- struct sockaddr_un sun;
- int fd, ret;
-
- /*
- * libust threads require the close-on-exec flag for all
- * resources so it does not leak file descriptors upon exec.
- * SOCK_CLOEXEC is not used since it is linux specific.
- */
- fd = socket(PF_UNIX, SOCK_STREAM, 0);
- if (fd < 0) {
- PERROR("socket");
- ret = -errno;
- goto error;
- }
- if (timeout >= 0) {
- /* Give at least 10ms. */
- if (timeout < 10)
- timeout = 10;
- ret = ustcomm_setsockopt_snd_timeout(fd, timeout);
- if (ret < 0) {
- WARN("Error setting connect socket send timeout");
- }
- }
- ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl");
- ret = -errno;
- goto error_fcntl;
- }
-
- memset(&sun, 0, sizeof(sun));
- sun.sun_family = AF_UNIX;
- strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
- sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
-
- ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
- if (ret < 0) {
- /*
- * Don't print message on connect ENOENT error, because
- * connect is used in normal execution to detect if
- * sessiond is alive. ENOENT is when the unix socket
- * file does not exist, and ECONNREFUSED is when the
- * file exists but no sessiond is listening.
- */
- if (errno != ECONNREFUSED && errno != ECONNRESET
- && errno != ENOENT && errno != EACCES)
- PERROR("connect");
- ret = -errno;
- if (ret == -ECONNREFUSED || ret == -ECONNRESET)
- ret = -EPIPE;
- goto error_connect;
- }
-
- return fd;
-
-error_connect:
-error_fcntl:
- {
- int closeret;
-
- closeret = close(fd);
- if (closeret)
- PERROR("close");
- }
-error:
- return ret;
-}
-
-/*
- * ustcomm_accept_unix_sock
- *
- * Do an accept(2) on the sock and return the
- * new file descriptor. The socket MUST be bind(2) before.
- */
-int ustcomm_accept_unix_sock(int sock)
-{
- int new_fd;
- struct sockaddr_un sun;
- socklen_t len = 0;
-
- /* Blocking call */
- new_fd = accept(sock, (struct sockaddr *) &sun, &len);
- if (new_fd < 0) {
- if (errno != ECONNABORTED)
- PERROR("accept");
- new_fd = -errno;
- if (new_fd == -ECONNABORTED)
- new_fd = -EPIPE;
- }
- return new_fd;
-}
-
-/*
- * ustcomm_create_unix_sock
- *
- * Creates a AF_UNIX local socket using pathname
- * bind the socket upon creation and return the fd.
- */
-int ustcomm_create_unix_sock(const char *pathname)
-{
- struct sockaddr_un sun;
- int fd, ret;
-
- /* Create server socket */
- if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
- PERROR("socket");
- ret = -errno;
- goto error;
- }
-
- memset(&sun, 0, sizeof(sun));
- sun.sun_family = AF_UNIX;
- strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
- sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
-
- /* Unlink the old file if present */
- (void) unlink(pathname);
- ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
- if (ret < 0) {
- PERROR("bind");
- ret = -errno;
- goto error_close;
- }
-
- return fd;
-
-error_close:
- {
- int closeret;
-
- closeret = close(fd);
- if (closeret) {
- PERROR("close");
- }
- }
-error:
- return ret;
-}
-
-/*
- * ustcomm_listen_unix_sock
- *
- * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
- */
-int ustcomm_listen_unix_sock(int sock)
-{
- int ret;
-
- ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN);
- if (ret < 0) {
- ret = -errno;
- PERROR("listen");
- }
-
- return ret;
-}
-
-/*
- * ustcomm_close_unix_sock
- *
- * Shutdown cleanly a unix socket.
- *
- * Handles fd tracker internally.
- */
-int ustcomm_close_unix_sock(int sock)
-{
- int ret;
-
- lttng_ust_lock_fd_tracker();
- ret = close(sock);
- if (!ret) {
- lttng_ust_delete_fd_from_tracker(sock);
- } else {
- PERROR("close");
- ret = -errno;
- }
- lttng_ust_unlock_fd_tracker();
-
- return ret;
-}
-
-/*
- * ustcomm_recv_unix_sock
- *
- * Receive data of size len in put that data into
- * the buf param. Using recvmsg API.
- * Return the size of received data.
- * Return 0 on orderly shutdown.
- */
-ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret = -1;
- size_t len_last;
-
- memset(&msg, 0, sizeof(msg));
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- do {
- len_last = iov[0].iov_len;
- ret = recvmsg(sock, &msg, 0);
- if (ret > 0) {
- iov[0].iov_base += ret;
- iov[0].iov_len -= ret;
- assert(ret <= len_last);
- }
- } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
-
- if (ret < 0) {
- int shutret;
-
- if (errno != EPIPE && errno != ECONNRESET && errno != ECONNREFUSED)
- PERROR("recvmsg");
- ret = -errno;
- if (ret == -ECONNRESET || ret == -ECONNREFUSED)
- ret = -EPIPE;
-
- shutret = shutdown(sock, SHUT_RDWR);
- if (shutret)
- ERR("Socket shutdown error");
- } else if (ret > 0) {
- ret = len;
- }
- /* ret = 0 means an orderly shutdown. */
-
- return ret;
-}
-
-/*
- * ustcomm_send_unix_sock
- *
- * Send buf data of size len. Using sendmsg API.
- * Return the size of sent data.
- */
-ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret;
-
- memset(&msg, 0, sizeof(msg));
-
- iov[0].iov_base = (void *) buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- /*
- * Using the MSG_NOSIGNAL when sending data from sessiond to
- * libust, so libust does not receive an unhandled SIGPIPE or
- * SIGURG. The sessiond receiver side can be made more resilient
- * by ignoring SIGPIPE, but we don't have this luxury on the
- * libust side.
- */
- do {
- ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
- } while (ret < 0 && errno == EINTR);
-
- if (ret < 0) {
- int shutret;
-
- if (errno != EPIPE && errno != ECONNRESET)
- PERROR("sendmsg");
- ret = -errno;
- if (ret == -ECONNRESET)
- ret = -EPIPE;
-
- shutret = shutdown(sock, SHUT_RDWR);
- if (shutret)
- ERR("Socket shutdown error");
- }
-
- return ret;
-}
-
-/*
- * Send a message accompanied by fd(s) over a unix socket.
- *
- * Returns the size of data sent, or negative error value.
- */
-ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
-{
- struct msghdr msg;
- struct cmsghdr *cmptr;
- struct iovec iov[1];
- ssize_t ret = -1;
- unsigned int sizeof_fds = nb_fd * sizeof(int);
- char tmp[CMSG_SPACE(sizeof_fds)];
- char dummy = 0;
-
- memset(&msg, 0, sizeof(msg));
- memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char));
-
- if (nb_fd > USTCOMM_MAX_SEND_FDS)
- return -EINVAL;
-
- msg.msg_control = (caddr_t)tmp;
- msg.msg_controllen = CMSG_LEN(sizeof_fds);
-
- cmptr = CMSG_FIRSTHDR(&msg);
- if (!cmptr)
- return -EINVAL;
- cmptr->cmsg_level = SOL_SOCKET;
- cmptr->cmsg_type = SCM_RIGHTS;
- cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
- memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
- /* Sum of the length of all control messages in the buffer: */
- msg.msg_controllen = cmptr->cmsg_len;
-
- iov[0].iov_base = &dummy;
- iov[0].iov_len = 1;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- do {
- ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
- /*
- * We consider EPIPE and ECONNRESET as expected.
- */
- if (errno != EPIPE && errno != ECONNRESET) {
- PERROR("sendmsg");
- }
- ret = -errno;
- if (ret == -ECONNRESET)
- ret = -EPIPE;
- }
- return ret;
-}
-
-/*
- * Recv a message accompanied by fd(s) from a unix socket.
- *
- * Expect at most "nb_fd" file descriptors. Returns the number of fd
- * actually received in nb_fd.
- * Returns -EPIPE on orderly shutdown.
- */
-ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
-{
- struct iovec iov[1];
- ssize_t ret = 0;
- struct cmsghdr *cmsg;
- size_t sizeof_fds = nb_fd * sizeof(int);
- char recv_fd[CMSG_SPACE(sizeof_fds)];
- struct msghdr msg;
- char dummy;
- int i;
-
- memset(&msg, 0, sizeof(msg));
-
- /* Prepare to receive the structures */
- iov[0].iov_base = &dummy;
- iov[0].iov_len = 1;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
- msg.msg_control = recv_fd;
- msg.msg_controllen = sizeof(recv_fd);
-
- do {
- ret = recvmsg(sock, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
- if (errno != EPIPE && errno != ECONNRESET) {
- PERROR("recvmsg fds");
- }
- ret = -errno;
- if (ret == -ECONNRESET)
- ret = -EPIPE;
- goto end;
- }
- if (ret == 0) {
- /* orderly shutdown */
- ret = -EPIPE;
- goto end;
- }
- if (ret != 1) {
- ERR("Error: Received %zd bytes, expected %d\n",
- ret, 1);
- goto end;
- }
- if (msg.msg_flags & MSG_CTRUNC) {
- ERR("Error: Control message truncated.\n");
- ret = -1;
- goto end;
- }
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg) {
- ERR("Error: Invalid control message header\n");
- ret = -1;
- goto end;
- }
- if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
- ERR("Didn't received any fd\n");
- ret = -1;
- goto end;
- }
- if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
- ERR("Error: Received %zu bytes of ancillary data, expected %zu\n",
- (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds));
- ret = -1;
- goto end;
- }
-
- memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
-
- /* Set FD_CLOEXEC */
- for (i = 0; i < nb_fd; i++) {
- ret = fcntl(fds[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl failed to set FD_CLOEXEC on fd %d",
- fds[i]);
- }
- }
-
- ret = nb_fd;
-end:
- return ret;
-}
-
-int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum)
-{
- ssize_t len;
-
- len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum));
- switch (len) {
- case sizeof(*lum):
- break;
- default:
- if (len < 0) {
- return len;
- } else {
- ERR("incorrect message size: %zd\n", len);
- return -EINVAL;
- }
- }
- return 0;
-}
-
-int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
- uint32_t expected_handle, uint32_t expected_cmd)
-{
- ssize_t len;
-
- memset(lur, 0, sizeof(*lur));
- len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur));
- switch (len) {
- case 0: /* orderly shutdown */
- return -EPIPE;
- case sizeof(*lur):
- {
- int err = 0;
-
- if (lur->handle != expected_handle) {
- ERR("Unexpected result message handle: "
- "expected: %u vs received: %u\n",
- expected_handle, lur->handle);
- err = 1;
- }
- if (lur->cmd != expected_cmd) {
- ERR("Unexpected result message command "
- "expected: %u vs received: %u\n",
- expected_cmd, lur->cmd);
- err = 1;
- }
- if (err) {
- return -EINVAL;
- } else {
- return lur->ret_code;
- }
- }
- default:
- if (len >= 0) {
- ERR("incorrect message size: %zd\n", len);
- }
- return len;
- }
-}
-
-int ustcomm_send_app_cmd(int sock,
- struct ustcomm_ust_msg *lum,
- struct ustcomm_ust_reply *lur)
-{
- int ret;
-
- ret = ustcomm_send_app_msg(sock, lum);
- if (ret)
- return ret;
- ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd);
- if (ret > 0)
- return -EIO;
- return ret;
-}
-
-/*
- * chan_data is allocated internally if this function returns the
- * expected var_len.
- */
-ssize_t ustcomm_recv_channel_from_sessiond(int sock,
- void **_chan_data, uint64_t var_len,
- int *_wakeup_fd)
-{
- void *chan_data;
- ssize_t len, nr_fd;
- int wakeup_fd, ret;
-
- if (var_len > LTTNG_UST_ABI_CHANNEL_DATA_MAX_LEN) {
- len = -EINVAL;
- goto error_check;
- }
- /* Receive variable length data */
- chan_data = zmalloc(var_len);
- if (!chan_data) {
- len = -ENOMEM;
- goto error_alloc;
- }
- len = ustcomm_recv_unix_sock(sock, chan_data, var_len);
- if (len != var_len) {
- goto error_recv;
- }
- /* recv wakeup fd */
- lttng_ust_lock_fd_tracker();
- nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1);
- if (nr_fd <= 0) {
- lttng_ust_unlock_fd_tracker();
- if (nr_fd < 0) {
- len = nr_fd;
- goto error_recv;
- } else {
- len = -EIO;
- goto error_recv;
- }
- }
-
- ret = lttng_ust_add_fd_to_tracker(wakeup_fd);
- if (ret < 0) {
- ret = close(wakeup_fd);
- if (ret) {
- PERROR("close on wakeup_fd");
- }
- len = -EIO;
- lttng_ust_unlock_fd_tracker();
- goto error_recv;
- }
-
- *_wakeup_fd = ret;
- lttng_ust_unlock_fd_tracker();
-
- *_chan_data = chan_data;
- return len;
-
-error_recv:
- free(chan_data);
-error_alloc:
-error_check:
- return len;
-}
-
-ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock,
- int *_event_notifier_notif_fd)
-{
- ssize_t nr_fd;
- int event_notifier_notif_fd, ret;
-
- /* Receive event_notifier notification fd */
- lttng_ust_lock_fd_tracker();
- nr_fd = ustcomm_recv_fds_unix_sock(sock, &event_notifier_notif_fd, 1);
- if (nr_fd <= 0) {
- lttng_ust_unlock_fd_tracker();
- if (nr_fd < 0) {
- ret = nr_fd;
- goto error;
- } else {
- ret = -EIO;
- goto error;
- }
- }
-
- ret = lttng_ust_add_fd_to_tracker(event_notifier_notif_fd);
- if (ret < 0) {
- ret = close(event_notifier_notif_fd);
- if (ret) {
- PERROR("close on event_notifier notif fd");
- }
- ret = -EIO;
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
-
- *_event_notifier_notif_fd = ret;
- lttng_ust_unlock_fd_tracker();
-
- ret = nr_fd;
-
-error:
- return ret;
-}
-
-int ustcomm_recv_stream_from_sessiond(int sock,
- uint64_t *memory_map_size __attribute__((unused)),
- int *shm_fd, int *wakeup_fd)
-{
- ssize_t len;
- int ret;
- int fds[2];
-
- /* recv shm fd and wakeup fd */
- lttng_ust_lock_fd_tracker();
- len = ustcomm_recv_fds_unix_sock(sock, fds, 2);
- if (len <= 0) {
- lttng_ust_unlock_fd_tracker();
- if (len < 0) {
- ret = len;
- goto error;
- } else {
- ret = -EIO;
- goto error;
- }
- }
-
- ret = lttng_ust_add_fd_to_tracker(fds[0]);
- if (ret < 0) {
- ret = close(fds[0]);
- if (ret) {
- PERROR("close on received shm_fd");
- }
- ret = -EIO;
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
- *shm_fd = ret;
-
- ret = lttng_ust_add_fd_to_tracker(fds[1]);
- if (ret < 0) {
- ret = close(*shm_fd);
- if (ret) {
- PERROR("close on shm_fd");
- }
- *shm_fd = -1;
- ret = close(fds[1]);
- if (ret) {
- PERROR("close on received wakeup_fd");
- }
- ret = -EIO;
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
- *wakeup_fd = ret;
- lttng_ust_unlock_fd_tracker();
- return 0;
-
-error:
- return ret;
-}
-
-ssize_t ustcomm_recv_counter_from_sessiond(int sock,
- void **_counter_data, uint64_t var_len)
-{
- void *counter_data;
- ssize_t len;
-
- if (var_len > LTTNG_UST_ABI_COUNTER_DATA_MAX_LEN) {
- len = -EINVAL;
- goto error_check;
- }
- /* Receive variable length data */
- counter_data = zmalloc(var_len);
- if (!counter_data) {
- len = -ENOMEM;
- goto error_alloc;
- }
- len = ustcomm_recv_unix_sock(sock, counter_data, var_len);
- if (len != var_len) {
- goto error_recv;
- }
- *_counter_data = counter_data;
- return len;
-
-error_recv:
- free(counter_data);
-error_alloc:
-error_check:
- return len;
-}
-
-int ustcomm_recv_counter_shm_from_sessiond(int sock,
- int *shm_fd)
-{
- ssize_t len;
- int ret;
- int fds[1];
-
- /* recv shm fd fd */
- lttng_ust_lock_fd_tracker();
- len = ustcomm_recv_fds_unix_sock(sock, fds, 1);
- if (len <= 0) {
- lttng_ust_unlock_fd_tracker();
- if (len < 0) {
- ret = len;
- goto error;
- } else {
- ret = -EIO;
- goto error;
- }
- }
-
- ret = lttng_ust_add_fd_to_tracker(fds[0]);
- if (ret < 0) {
- ret = close(fds[0]);
- if (ret) {
- PERROR("close on received shm_fd");
- }
- ret = -EIO;
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
- *shm_fd = ret;
- lttng_ust_unlock_fd_tracker();
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Returns 0 on success, negative error value on error.
- */
-int ustcomm_send_reg_msg(int sock,
- enum ustctl_socket_type type,
- uint32_t bits_per_long,
- uint32_t uint8_t_alignment,
- uint32_t uint16_t_alignment,
- uint32_t uint32_t_alignment,
- uint32_t uint64_t_alignment,
- uint32_t long_alignment)
-{
- ssize_t len;
- struct ustctl_reg_msg reg_msg;
-
- reg_msg.magic = LTTNG_UST_ABI_COMM_MAGIC;
- reg_msg.major = LTTNG_UST_ABI_MAJOR_VERSION;
- reg_msg.minor = LTTNG_UST_ABI_MINOR_VERSION;
- reg_msg.pid = getpid();
- reg_msg.ppid = getppid();
- reg_msg.uid = getuid();
- reg_msg.gid = getgid();
- reg_msg.bits_per_long = bits_per_long;
- reg_msg.uint8_t_alignment = uint8_t_alignment;
- reg_msg.uint16_t_alignment = uint16_t_alignment;
- reg_msg.uint32_t_alignment = uint32_t_alignment;
- reg_msg.uint64_t_alignment = uint64_t_alignment;
- reg_msg.long_alignment = long_alignment;
- reg_msg.socket_type = type;
- lttng_pthread_getname_np(reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN);
- memset(reg_msg.padding, 0, sizeof(reg_msg.padding));
-
- len = ustcomm_send_unix_sock(sock, ®_msg, sizeof(reg_msg));
- if (len > 0 && len != sizeof(reg_msg))
- return -EIO;
- if (len < 0)
- return len;
- return 0;
-}
-
-static
-ssize_t count_one_type(const struct lttng_ust_type_common *lt)
-{
- switch (lt->type) {
- case lttng_ust_type_integer:
- case lttng_ust_type_float:
- case lttng_ust_type_string:
- return 1;
- case lttng_ust_type_enum:
- return count_one_type(lttng_ust_get_type_enum(lt)->container_type) + 1;
- case lttng_ust_type_array:
- return count_one_type(lttng_ust_get_type_array(lt)->elem_type) + 1;
- case lttng_ust_type_sequence:
- return count_one_type(lttng_ust_get_type_sequence(lt)->elem_type) + 1;
- case lttng_ust_type_struct:
- return count_fields_recursive(lttng_ust_get_type_struct(lt)->nr_fields,
- lttng_ust_get_type_struct(lt)->fields) + 1;
-
- case lttng_ust_type_dynamic:
- {
- const struct lttng_ust_event_field **choices;
- size_t nr_choices;
- int ret;
-
- ret = lttng_ust_dynamic_type_choices(&nr_choices,
- &choices);
- if (ret)
- return ret;
- /*
- * Two fields for enum, one field for variant, and
- * one field per choice.
- */
- return count_fields_recursive(nr_choices, choices) + 3;
- }
-
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static
-ssize_t count_fields_recursive(size_t nr_fields,
- const struct lttng_ust_event_field **lttng_fields)
-{
- int i;
- ssize_t ret, count = 0;
-
- for (i = 0; i < nr_fields; i++) {
- const struct lttng_ust_event_field *lf;
-
- lf = lttng_fields[i];
- /* skip 'nowrite' fields */
- if (lf->nowrite)
- continue;
- ret = count_one_type(lf->type);
- if (ret < 0)
- return ret; /* error */
- count += ret;
- }
- return count;
-}
-
-static
-ssize_t count_ctx_fields_recursive(size_t nr_fields,
- struct lttng_ust_ctx_field *lttng_fields)
-{
- int i;
- ssize_t ret, count = 0;
-
- for (i = 0; i < nr_fields; i++) {
- const struct lttng_ust_event_field *lf;
-
- lf = lttng_fields[i].event_field;
- /* skip 'nowrite' fields */
- if (lf->nowrite)
- continue;
- ret = count_one_type(lf->type);
- if (ret < 0)
- return ret; /* error */
- count += ret;
- }
- return count;
-}
-
-static
-int serialize_string_encoding(int32_t *ue,
- enum lttng_ust_string_encoding le)
-{
- switch (le) {
- case lttng_ust_string_encoding_none:
- *ue = ustctl_encode_none;
- break;
- case lttng_ust_string_encoding_UTF8:
- *ue = ustctl_encode_UTF8;
- break;
- case lttng_ust_string_encoding_ASCII:
- *ue = ustctl_encode_ASCII;
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static
-int serialize_integer_type(struct ustctl_integer_type *uit,
- const struct lttng_ust_type_integer *lit,
- enum lttng_ust_string_encoding lencoding)
-{
- int32_t encoding;
-
- uit->size = lit->size;
- uit->signedness = lit->signedness;
- uit->reverse_byte_order = lit->reverse_byte_order;
- uit->base = lit->base;
- if (serialize_string_encoding(&encoding, lencoding))
- return -EINVAL;
- uit->encoding = encoding;
- uit->alignment = lit->alignment;
- return 0;
-}
-
-static
-int serialize_dynamic_type(struct lttng_ust_session *session,
- struct ustctl_field *fields, size_t *iter_output,
- const char *field_name)
-{
- const struct lttng_ust_event_field **choices;
- char tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN];
- const struct lttng_ust_type_common *tag_type;
- const struct lttng_ust_event_field *tag_field_generic;
- struct lttng_ust_event_field tag_field = {
- .name = tag_field_name,
- .nowrite = 0,
- };
- struct ustctl_field *uf;
- size_t nr_choices, i;
- int ret;
-
- tag_field_generic = lttng_ust_dynamic_type_tag_field();
- tag_type = tag_field_generic->type;
-
- /* Serialize enum field. */
- strncpy(tag_field_name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- tag_field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- strncat(tag_field_name,
- "_tag",
- LTTNG_UST_ABI_SYM_NAME_LEN - strlen(tag_field_name) - 1);
- tag_field.type = tag_type;
- ret = serialize_one_field(session, fields, iter_output,
- &tag_field);
- if (ret)
- return ret;
-
- /* Serialize variant field. */
- uf = &fields[*iter_output];
- ret = lttng_ust_dynamic_type_choices(&nr_choices, &choices);
- if (ret)
- return ret;
-
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- uf->type.atype = ustctl_atype_variant;
- uf->type.u.variant_nestable.nr_choices = nr_choices;
- strncpy(uf->type.u.variant_nestable.tag_name,
- tag_field_name,
- LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->type.u.variant_nestable.tag_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- uf->type.u.variant_nestable.alignment = 0;
- (*iter_output)++;
-
- /* Serialize choice fields after variant. */
- for (i = 0; i < nr_choices; i++) {
- ret = serialize_one_field(session, fields,
- iter_output, choices[i]);
- if (ret)
- return ret;
- }
- return 0;
-}
-
-static
-int serialize_one_type(struct lttng_ust_session *session,
- struct ustctl_field *fields, size_t *iter_output,
- const char *field_name, const struct lttng_ust_type_common *lt,
- enum lttng_ust_string_encoding parent_encoding)
-{
- int ret;
-
- /*
- * Serializing a type (rather than a field) generates a ustctl_field
- * entry with 0-length name.
- */
-
- switch (lt->type) {
- case lttng_ust_type_integer:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- ret = serialize_integer_type(&ut->u.integer, lttng_ust_get_type_integer(lt),
- parent_encoding);
- if (ret)
- return ret;
- ut->atype = ustctl_atype_integer;
- (*iter_output)++;
- break;
- }
- case lttng_ust_type_float:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
- struct ustctl_float_type *uft;
- const struct lttng_ust_type_float *lft;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- uft = &ut->u._float;
- lft = lttng_ust_get_type_float(lt);
- uft->exp_dig = lft->exp_dig;
- uft->mant_dig = lft->mant_dig;
- uft->alignment = lft->alignment;
- uft->reverse_byte_order = lft->reverse_byte_order;
- ut->atype = ustctl_atype_float;
- (*iter_output)++;
- break;
- }
- case lttng_ust_type_string:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
- int32_t encoding;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- ret = serialize_string_encoding(&encoding, lttng_ust_get_type_string(lt)->encoding);
- if (ret)
- return ret;
- ut->u.string.encoding = encoding;
- ut->atype = ustctl_atype_string;
- (*iter_output)++;
- break;
- }
- case lttng_ust_type_array:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- ut->atype = ustctl_atype_array_nestable;
- ut->u.array_nestable.length = lttng_ust_get_type_array(lt)->length;
- ut->u.array_nestable.alignment = lttng_ust_get_type_array(lt)->alignment;
- (*iter_output)++;
-
- ret = serialize_one_type(session, fields, iter_output, NULL,
- lttng_ust_get_type_array(lt)->elem_type,
- lttng_ust_get_type_array(lt)->encoding);
- if (ret)
- return -EINVAL;
- break;
- }
- case lttng_ust_type_sequence:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- ut->atype = ustctl_atype_sequence_nestable;
- strncpy(ut->u.sequence_nestable.length_name,
- lttng_ust_get_type_sequence(lt)->length_name,
- LTTNG_UST_ABI_SYM_NAME_LEN);
- ut->u.sequence_nestable.length_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- ut->u.sequence_nestable.alignment = lttng_ust_get_type_sequence(lt)->alignment;
- (*iter_output)++;
-
- ret = serialize_one_type(session, fields, iter_output, NULL,
- lttng_ust_get_type_sequence(lt)->elem_type,
- lttng_ust_get_type_sequence(lt)->encoding);
- if (ret)
- return -EINVAL;
- break;
- }
- case lttng_ust_type_dynamic:
- {
- ret = serialize_dynamic_type(session, fields, iter_output,
- field_name);
- if (ret)
- return -EINVAL;
- break;
- }
- case lttng_ust_type_struct:
- {
- struct ustctl_field *uf = &fields[*iter_output];
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- uf->type.atype = ustctl_atype_struct_nestable;
- uf->type.u.struct_nestable.nr_fields = lttng_ust_get_type_struct(lt)->nr_fields;
- uf->type.u.struct_nestable.alignment = lttng_ust_get_type_struct(lt)->alignment;
- (*iter_output)++;
-
- ret = serialize_fields(session, fields, iter_output,
- lttng_ust_get_type_struct(lt)->nr_fields,
- lttng_ust_get_type_struct(lt)->fields);
- if (ret)
- return -EINVAL;
- break;
- }
- case lttng_ust_type_enum:
- {
- struct ustctl_field *uf = &fields[*iter_output];
- struct ustctl_type *ut = &uf->type;
-
- if (field_name) {
- strncpy(uf->name, field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- uf->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- } else {
- uf->name[0] = '\0';
- }
- strncpy(ut->u.enum_nestable.name, lttng_ust_get_type_enum(lt)->desc->name,
- LTTNG_UST_ABI_SYM_NAME_LEN);
- ut->u.enum_nestable.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- ut->atype = ustctl_atype_enum_nestable;
- (*iter_output)++;
-
- ret = serialize_one_type(session, fields, iter_output, NULL,
- lttng_ust_get_type_enum(lt)->container_type,
- lttng_ust_string_encoding_none);
- if (ret)
- return -EINVAL;
- if (session) {
- const struct lttng_enum *_enum;
-
- _enum = lttng_ust_enum_get_from_desc(session, lttng_ust_get_type_enum(lt)->desc);
- if (!_enum)
- return -EINVAL;
- ut->u.enum_nestable.id = _enum->id;
- } else {
- ut->u.enum_nestable.id = -1ULL;
- }
- break;
- }
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static
-int serialize_one_field(struct lttng_ust_session *session,
- struct ustctl_field *fields, size_t *iter_output,
- const struct lttng_ust_event_field *lf)
-{
- /* skip 'nowrite' fields */
- if (lf->nowrite)
- return 0;
-
- return serialize_one_type(session, fields, iter_output, lf->name, lf->type, lttng_ust_string_encoding_none);
-}
-
-static
-int serialize_fields(struct lttng_ust_session *session,
- struct ustctl_field *ustctl_fields,
- size_t *iter_output, size_t nr_lttng_fields,
- const struct lttng_ust_event_field **lttng_fields)
-{
- int ret;
- size_t i;
-
- for (i = 0; i < nr_lttng_fields; i++) {
- ret = serialize_one_field(session, ustctl_fields,
- iter_output, lttng_fields[i]);
- if (ret)
- return ret;
- }
- return 0;
-}
-
-static
-int alloc_serialize_fields(struct lttng_ust_session *session,
- size_t *_nr_write_fields,
- struct ustctl_field **ustctl_fields,
- size_t nr_fields,
- const struct lttng_ust_event_field **lttng_fields)
-{
- struct ustctl_field *fields;
- int ret;
- size_t iter_output = 0;
- ssize_t nr_write_fields;
-
- nr_write_fields = count_fields_recursive(nr_fields, lttng_fields);
- if (nr_write_fields < 0) {
- return (int) nr_write_fields;
- }
-
- fields = zmalloc(nr_write_fields * sizeof(*fields));
- if (!fields)
- return -ENOMEM;
-
- ret = serialize_fields(session, fields, &iter_output, nr_fields,
- lttng_fields);
- if (ret)
- goto error_type;
-
- *_nr_write_fields = nr_write_fields;
- *ustctl_fields = fields;
- return 0;
-
-error_type:
- free(fields);
- return ret;
-}
-
-static
-int serialize_entries(struct ustctl_enum_entry **_entries,
- size_t nr_entries,
- const struct lttng_ust_enum_entry **lttng_entries)
-{
- struct ustctl_enum_entry *entries;
- int i;
-
- /* Serialize the entries */
- entries = zmalloc(nr_entries * sizeof(*entries));
- if (!entries)
- return -ENOMEM;
- for (i = 0; i < nr_entries; i++) {
- struct ustctl_enum_entry *uentry;
- const struct lttng_ust_enum_entry *lentry;
-
- uentry = &entries[i];
- lentry = lttng_entries[i];
-
- uentry->start.value = lentry->start.value;
- uentry->start.signedness = lentry->start.signedness;
- uentry->end.value = lentry->end.value;
- uentry->end.signedness = lentry->end.signedness;
- strncpy(uentry->string, lentry->string, LTTNG_UST_ABI_SYM_NAME_LEN);
- uentry->string[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
-
- if (lentry->options & LTTNG_UST_ENUM_ENTRY_OPTION_IS_AUTO) {
- uentry->u.extra.options |=
- USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO;
- }
- }
- *_entries = entries;
- return 0;
-}
-
-static
-int serialize_ctx_fields(struct lttng_ust_session *session,
- size_t *_nr_write_fields,
- struct ustctl_field **ustctl_fields,
- size_t nr_fields,
- struct lttng_ust_ctx_field *lttng_fields)
-{
- struct ustctl_field *fields;
- int ret;
- size_t i, iter_output = 0;
- ssize_t nr_write_fields;
-
- nr_write_fields = count_ctx_fields_recursive(nr_fields,
- lttng_fields);
- if (nr_write_fields < 0) {
- return (int) nr_write_fields;
- }
-
- fields = zmalloc(nr_write_fields * sizeof(*fields));
- if (!fields)
- return -ENOMEM;
-
- for (i = 0; i < nr_fields; i++) {
- ret = serialize_one_field(session, fields, &iter_output,
- lttng_fields[i].event_field);
- if (ret)
- goto error_type;
- }
-
- *_nr_write_fields = nr_write_fields;
- *ustctl_fields = fields;
- return 0;
-
-error_type:
- free(fields);
- return ret;
-}
-
-/*
- * Returns 0 on success, negative error value on error.
- */
-int ustcomm_register_event(int sock,
- struct lttng_ust_session *session,
- int session_objd, /* session descriptor */
- int channel_objd, /* channel descriptor */
- const char *event_name, /* event name (input) */
- int loglevel,
- const char *signature, /* event signature (input) */
- size_t nr_fields, /* fields */
- const struct lttng_ust_event_field **lttng_fields,
- const char *model_emf_uri,
- uint32_t *id) /* event id (output) */
-{
- ssize_t len;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_event_msg m;
- } msg;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_event_reply r;
- } reply;
- size_t signature_len, fields_len, model_emf_uri_len;
- struct ustctl_field *fields = NULL;
- size_t nr_write_fields = 0;
- int ret;
-
- memset(&msg, 0, sizeof(msg));
- msg.header.notify_cmd = USTCTL_NOTIFY_CMD_EVENT;
- msg.m.session_objd = session_objd;
- msg.m.channel_objd = channel_objd;
- strncpy(msg.m.event_name, event_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- msg.m.event_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
- msg.m.loglevel = loglevel;
- signature_len = strlen(signature) + 1;
- msg.m.signature_len = signature_len;
-
- /* Calculate fields len, serialize fields. */
- if (nr_fields > 0) {
- ret = alloc_serialize_fields(session, &nr_write_fields, &fields,
- nr_fields, lttng_fields);
- if (ret)
- return ret;
- }
-
- fields_len = sizeof(*fields) * nr_write_fields;
- msg.m.fields_len = fields_len;
- if (model_emf_uri) {
- model_emf_uri_len = strlen(model_emf_uri) + 1;
- } else {
- model_emf_uri_len = 0;
- }
- msg.m.model_emf_uri_len = model_emf_uri_len;
-
- len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
- if (len > 0 && len != sizeof(msg)) {
- ret = -EIO;
- goto error_fields;
- }
- if (len < 0) {
- ret = len;
- goto error_fields;
- }
-
- /* send signature */
- len = ustcomm_send_unix_sock(sock, signature, signature_len);
- if (len > 0 && len != signature_len) {
- ret = -EIO;
- goto error_fields;
- }
- if (len < 0) {
- ret = len;
- goto error_fields;
- }
-
- /* send fields */
- if (fields_len > 0) {
- len = ustcomm_send_unix_sock(sock, fields, fields_len);
- if (len > 0 && len != fields_len) {
- ret = -EIO;
- goto error_fields;
- }
- if (len < 0) {
- ret = len;
- goto error_fields;
- }
- }
- free(fields);
-
- if (model_emf_uri_len) {
- /* send model_emf_uri */
- len = ustcomm_send_unix_sock(sock, model_emf_uri,
- model_emf_uri_len);
- if (len > 0 && len != model_emf_uri_len) {
- return -EIO;
- }
- if (len < 0) {
- return len;
- }
- }
-
- /* receive reply */
- len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
- switch (len) {
- case 0: /* orderly shutdown */
- return -EPIPE;
- case sizeof(reply):
- if (reply.header.notify_cmd != msg.header.notify_cmd) {
- ERR("Unexpected result message command "
- "expected: %u vs received: %u\n",
- msg.header.notify_cmd, reply.header.notify_cmd);
- return -EINVAL;
- }
- if (reply.r.ret_code > 0)
- return -EINVAL;
- if (reply.r.ret_code < 0)
- return reply.r.ret_code;
- *id = reply.r.event_id;
- DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n",
- event_name, reply.r.ret_code, reply.r.event_id);
- return 0;
- default:
- if (len < 0) {
- /* Transport level error */
- if (errno == EPIPE || errno == ECONNRESET)
- len = -errno;
- return len;
- } else {
- ERR("incorrect message size: %zd\n", len);
- return len;
- }
- }
- /* Unreached. */
-
- /* Error path only. */
-error_fields:
- free(fields);
- return ret;
-}
-
-/*
- * Returns 0 on success, negative error value on error.
- * Returns -EPIPE or -ECONNRESET if other end has hung up.
- */
-int ustcomm_register_enum(int sock,
- int session_objd, /* session descriptor */
- const char *enum_name, /* enum name (input) */
- size_t nr_entries, /* entries */
- const struct lttng_ust_enum_entry **lttng_entries,
- uint64_t *id)
-{
- ssize_t len;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_enum_msg m;
- } msg;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_enum_reply r;
- } reply;
- size_t entries_len;
- struct ustctl_enum_entry *entries = NULL;
- int ret;
-
- memset(&msg, 0, sizeof(msg));
- msg.header.notify_cmd = USTCTL_NOTIFY_CMD_ENUM;
- msg.m.session_objd = session_objd;
- strncpy(msg.m.enum_name, enum_name, LTTNG_UST_ABI_SYM_NAME_LEN);
- msg.m.enum_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
-
- /* Calculate entries len, serialize entries. */
- if (nr_entries > 0) {
- ret = serialize_entries(&entries,
- nr_entries, lttng_entries);
- if (ret)
- return ret;
- }
-
- entries_len = sizeof(*entries) * nr_entries;
- msg.m.entries_len = entries_len;
-
- len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
- if (len > 0 && len != sizeof(msg)) {
- ret = -EIO;
- goto error_entries;
- }
- if (len < 0) {
- ret = len;
- goto error_entries;
- }
-
- /* send entries */
- if (entries_len > 0) {
- len = ustcomm_send_unix_sock(sock, entries, entries_len);
- if (len > 0 && len != entries_len) {
- ret = -EIO;
- goto error_entries;
- }
- if (len < 0) {
- ret = len;
- goto error_entries;
- }
- }
- free(entries);
- entries = NULL;
-
- /* receive reply */
- len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
- switch (len) {
- case 0: /* orderly shutdown */
- return -EPIPE;
- case sizeof(reply):
- if (reply.header.notify_cmd != msg.header.notify_cmd) {
- ERR("Unexpected result message command "
- "expected: %u vs received: %u\n",
- msg.header.notify_cmd, reply.header.notify_cmd);
- return -EINVAL;
- }
- if (reply.r.ret_code > 0)
- return -EINVAL;
- if (reply.r.ret_code < 0)
- return reply.r.ret_code;
- *id = reply.r.enum_id;
- DBG("Sent register enum notification for name \"%s\": ret_code %d\n",
- enum_name, reply.r.ret_code);
- return 0;
- default:
- if (len < 0) {
- /* Transport level error */
- if (errno == EPIPE || errno == ECONNRESET)
- len = -errno;
- return len;
- } else {
- ERR("incorrect message size: %zd\n", len);
- return len;
- }
- }
- return ret;
-
-error_entries:
- free(entries);
- return ret;
-}
-
-/*
- * Returns 0 on success, negative error value on error.
- * Returns -EPIPE or -ECONNRESET if other end has hung up.
- */
-int ustcomm_register_channel(int sock,
- struct lttng_ust_session *session,
- int session_objd, /* session descriptor */
- int channel_objd, /* channel descriptor */
- size_t nr_ctx_fields,
- struct lttng_ust_ctx_field *ctx_fields,
- uint32_t *chan_id, /* channel id (output) */
- int *header_type) /* header type (output) */
-{
- ssize_t len;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_channel_msg m;
- } msg;
- struct {
- struct ustcomm_notify_hdr header;
- struct ustcomm_notify_channel_reply r;
- } reply;
- size_t fields_len;
- struct ustctl_field *fields = NULL;
- int ret;
- size_t nr_write_fields = 0;
-
- memset(&msg, 0, sizeof(msg));
- msg.header.notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL;
- msg.m.session_objd = session_objd;
- msg.m.channel_objd = channel_objd;
-
- /* Calculate fields len, serialize fields. */
- if (nr_ctx_fields > 0) {
- ret = serialize_ctx_fields(session, &nr_write_fields, &fields,
- nr_ctx_fields, ctx_fields);
- if (ret)
- return ret;
- }
-
- fields_len = sizeof(*fields) * nr_write_fields;
- msg.m.ctx_fields_len = fields_len;
- len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg));
- if (len > 0 && len != sizeof(msg)) {
- free(fields);
- return -EIO;
- }
- if (len < 0) {
- free(fields);
- return len;
- }
-
- /* send fields */
- if (fields_len > 0) {
- len = ustcomm_send_unix_sock(sock, fields, fields_len);
- free(fields);
- if (len > 0 && len != fields_len) {
- return -EIO;
- }
- if (len < 0) {
- return len;
- }
- } else {
- free(fields);
- }
-
- len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply));
- switch (len) {
- case 0: /* orderly shutdown */
- return -EPIPE;
- case sizeof(reply):
- if (reply.header.notify_cmd != msg.header.notify_cmd) {
- ERR("Unexpected result message command "
- "expected: %u vs received: %u\n",
- msg.header.notify_cmd, reply.header.notify_cmd);
- return -EINVAL;
- }
- if (reply.r.ret_code > 0)
- return -EINVAL;
- if (reply.r.ret_code < 0)
- return reply.r.ret_code;
- *chan_id = reply.r.chan_id;
- switch (reply.r.header_type) {
- case 1:
- case 2:
- *header_type = reply.r.header_type;
- break;
- default:
- ERR("Unexpected channel header type %u\n",
- reply.r.header_type);
- return -EINVAL;
- }
- DBG("Sent register channel notification: chan_id %d, header_type %d\n",
- reply.r.chan_id, reply.r.header_type);
- return 0;
- default:
- if (len < 0) {
- /* Transport level error */
- if (errno == EPIPE || errno == ECONNRESET)
- len = -errno;
- return len;
- } else {
- ERR("incorrect message size: %zd\n", len);
- return len;
- }
- }
-}
-
-/*
- * Set socket reciving timeout.
- */
-int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec)
-{
- int ret;
- struct timeval tv;
-
- tv.tv_sec = msec / 1000;
- tv.tv_usec = (msec * 1000 % 1000000);
-
- ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
- if (ret < 0) {
- PERROR("setsockopt SO_RCVTIMEO");
- ret = -errno;
- }
-
- return ret;
-}
-
-/*
- * Set socket sending timeout.
- */
-int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec)
-{
- int ret;
- struct timeval tv;
-
- tv.tv_sec = msec / 1000;
- tv.tv_usec = (msec * 1000) % 1000000;
-
- ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
- if (ret < 0) {
- PERROR("setsockopt SO_SNDTIMEO");
- ret = -errno;
- }
-
- return ret;
-}
liblttng_ust_la_LIBADD = \
-lrt \
liblttng-ust-common.la \
+ $(top_builddir)/src/common/libustcomm.la \
$(top_builddir)/src/common/libcommon.la \
- $(top_builddir)/src/liblttng-ust-comm/liblttng-ust-comm.la \
liblttng-ust-tracepoint.la \
liblttng-ust-runtime.la liblttng-ust-support.la \
$(DL_LIBS)
projects / lttng-ust.git / commitdiff
