/*
* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#define _GNU_SOURCE
#include <limits.h>
+#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
+#include <lttng/ust-ctl.h>
#include <ust-comm.h>
+#include <ust-fd.h>
+#include <helper.h>
+#include <lttng/ust-error.h>
+#include <lttng/ust-events.h>
+#include <lttng/ust-dynamic-type.h>
+#include <usterr-signal-safe.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_event_field *lttng_fields);
+static
+int serialize_one_field(struct lttng_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const struct lttng_event_field *lf);
/*
* Human readable error message.
*/
static const char *ustcomm_readable_code[] = {
- [ USTCOMM_ERR_INDEX(USTCOMM_ERR) ] = "Unknown error",
- [ USTCOMM_ERR_INDEX(USTCOMM_UND) ] = "Undefined command",
- [ USTCOMM_ERR_INDEX(USTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
- [ USTCOMM_ERR_INDEX(USTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_SESSION) ] = "No session found",
- [ USTCOMM_ERR_INDEX(USTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_APPS) ] = "No traceable apps found",
- [ USTCOMM_ERR_INDEX(USTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_TRACE) ] = "No trace found",
- [ USTCOMM_ERR_INDEX(USTCOMM_FATAL) ] = "Fatal error of the session daemon",
- [ USTCOMM_ERR_INDEX(USTCOMM_CREATE_FAIL) ] = "Create trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_START_FAIL) ] = "Start trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_STOP_FAIL) ] = "Stop trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_TRACEABLE) ] = "App is not traceable",
- [ USTCOMM_ERR_INDEX(USTCOMM_SELECT_SESS) ] = "A session MUST be selected",
- [ USTCOMM_ERR_INDEX(USTCOMM_EXIST_SESS) ] = "Session name already exist",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_NA) ] = "UST tracer not available",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_EVENT_EXIST) ] = "UST event already exists",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_SESS_FAIL) ] = "UST create session failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_FAIL) ] = "UST create channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_NOT_FOUND) ] = "UST channel not found",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CONTEXT_FAIL) ] = "Add UST context failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_ENABLE_FAIL) ] = "Enable UST event failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DISABLE_FAIL) ] = "Disable UST event failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_START_FAIL) ] = "Starting UST trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_STOP_FAIL) ] = "Stoping UST trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CONSUMER_FAIL) ] = "UST consumer start failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_STREAM_FAIL) ] = "UST create stream failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DIR_FAIL) ] = "UST trace directory creation failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DIR_EXIST) ] = "UST trace directory already exist",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_NO_SESSION) ] = "No UST session found",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_LIST_FAIL) ] = "Listing UST events failed",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_COMMAND_SOCK_READY) ] = "UST consumer command socket ready",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SUCCESS_RECV_FD) ] = "UST consumer success on receiving fds",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_ERROR_RECV_FD) ] = "UST consumer error on receiving fds",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_ERROR) ] = "UST consumer error in polling thread",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_NVAL) ] = "UST consumer polling on closed fd",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_HUP) ] = "UST consumer all fd hung up",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_EXIT_SUCCESS) ] = "UST consumer exiting normally",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_EXIT_FAILURE) ] = "UST consumer exiting on error",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_OUTFD_ERROR) ] = "UST consumer error opening the tracefile",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_EBADF) ] = "UST consumer splice EBADF",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_EINVAL) ] = "UST consumer splice EINVAL",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_ENOMEM) ] = "UST consumer splice ENOMEM",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_ESPIPE) ] = "UST consumer splice ESPIPE",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_EVENT) ] = "Event not found",
+ [ 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",
};
/*
- * lttcom_get_readable_code
+ * lttng_ust_strerror
*
- * Return ptr to string representing a human readable
- * error code from the ustcomm_return_code enum.
+ * Receives positive error value.
+ * Return ptr to string representing a human readable
+ * error code from the ustcomm_return_code enum.
*/
-const char *ustcomm_get_readable_code(int code)
+const char *lttng_ust_strerror(int code)
{
- if (code == USTCOMM_OK) {
- return "Success";
- }
- if (code >= USTCOMM_ERR && code < USTCOMM_NR) {
- return ustcomm_readable_code[USTCOMM_ERR_INDEX(code)];
- }
- return strerror(code);
+ if (code == LTTNG_UST_OK)
+ return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)];
+ if (code < LTTNG_UST_ERR)
+ return strerror(code);
+ if (code >= LTTNG_UST_ERR_NR)
+ code = LTTNG_UST_ERR;
+ return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)];
}
/*
- * ustcomm_connect_unix_sock
+ * ustcomm_connect_unix_sock
*
- * Connect to unix socket using the path name.
+ * Connect to unix socket using the path name.
+ *
+ * Caller handles FD tracker.
*/
-int ustcomm_connect_unix_sock(const char *pathname)
+int ustcomm_connect_unix_sock(const char *pathname, long timeout)
{
struct sockaddr_un sun;
- int fd;
- int ret;
+ int fd, ret;
/*
* libust threads require the close-on-exec flag for all
*/
fd = socket(PF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
- perror("socket");
- ret = fd;
+ 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");
+ PERROR("fcntl");
+ ret = -errno;
goto error_fcntl;
}
ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
if (ret < 0) {
/*
- * Don't print message on connect error, because connect
- * is used in normal execution to detect if sessiond is
- * alive.
+ * 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;
}
error_connect:
error_fcntl:
- close(fd);
+ {
+ int closeret;
+
+ closeret = close(fd);
+ if (closeret)
+ PERROR("close");
+ }
error:
return ret;
}
/*
- * ustcomm_accept_unix_sock
+ * ustcomm_accept_unix_sock
*
- * Do an accept(2) on the sock and return the
- * new file descriptor. The socket MUST be bind(2) before.
+ * 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)
{
/* Blocking call */
new_fd = accept(sock, (struct sockaddr *) &sun, &len);
if (new_fd < 0) {
- perror("accept");
- goto error;
+ if (errno != ECONNABORTED)
+ PERROR("accept");
+ new_fd = -errno;
+ if (new_fd == -ECONNABORTED)
+ new_fd = -EPIPE;
}
-
return new_fd;
-
-error:
- return -1;
}
/*
- * ustcomm_create_unix_sock
+ * ustcomm_create_unix_sock
*
- * Creates a AF_UNIX local socket using pathname
- * bind the socket upon creation and return the fd.
+ * 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;
- int ret = -1;
+ int fd, ret;
/* Create server socket */
if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
- perror("socket");
+ PERROR("socket");
+ ret = -errno;
goto error;
}
(void) unlink(pathname);
ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
if (ret < 0) {
- perror("bind");
- goto error;
+ 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
+ * ustcomm_listen_unix_sock
*
- * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
+ * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
*/
int ustcomm_listen_unix_sock(int sock)
{
ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN);
if (ret < 0) {
- perror("listen");
+ 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
+ * 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.
+ * 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));
msg.msg_iov = iov;
msg.msg_iovlen = 1;
- ret = recvmsg(sock, &msg, 0);
+ 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) {
- perror("recvmsg");
+ 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
+ * ustcomm_send_unix_sock
*
- * Send buf data of size len. Using sendmsg API.
- * Return the size of sent data.
+ * Send buf data of size len. Using sendmsg API.
+ * Return the size of sent data.
*/
-ssize_t ustcomm_send_unix_sock(int sock, void *buf, size_t len)
+ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len)
{
struct msghdr msg;
struct iovec iov[1];
- ssize_t ret = -1;
+ ssize_t ret;
memset(&msg, 0, sizeof(msg));
- iov[0].iov_base = buf;
+ iov[0].iov_base = (void *) buf;
iov[0].iov_len = len;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
* by ignoring SIGPIPE, but we don't have this luxury on the
* libust side.
*/
- ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
- if (ret < 0) {
- perror("sendmsg");
- }
+ do {
+ ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
+ } while (ret < 0 && errno == EINTR);
- return ret;
-}
+ if (ret < 0) {
+ int shutret;
-/*
- * ustcomm_close_unix_sock
- *
- * Shutdown cleanly a unix socket.
- */
-int ustcomm_close_unix_sock(int sock)
-{
- int ret;
+ if (errno != EPIPE && errno != ECONNRESET)
+ PERROR("sendmsg");
+ ret = -errno;
+ if (ret == -ECONNRESET)
+ ret = -EPIPE;
- /* Shutdown receptions and transmissions */
- ret = shutdown(sock, SHUT_RDWR);
- if (ret < 0) {
- perror("shutdown");
+ shutret = shutdown(sock, SHUT_RDWR);
+ if (shutret)
+ ERR("Socket shutdown error");
}
return ret;
}
/*
- * ustcomm_send_fds_unix_sock
+ * Send a message accompanied by fd(s) over a unix socket.
*
- * Send multiple fds on a unix socket.
+ * Returns the size of data sent, or negative error value.
*/
-ssize_t ustcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len)
+ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
{
struct msghdr msg;
struct cmsghdr *cmptr;
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));
- /*
- * Note: the consumerd receiver only supports receiving one FD per
- * message.
- */
- assert(nb_fd == 1);
+ 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);
/* Sum of the length of all control messages in the buffer: */
msg.msg_controllen = cmptr->cmsg_len;
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
+ iov[0].iov_base = &dummy;
+ iov[0].iov_len = 1;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
- ret = sendmsg(sock, &msg, 0);
+ do {
+ ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
+ } while (ret < 0 && errno == EINTR);
if (ret < 0) {
- perror("sendmsg");
+ /*
+ * 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;
+
+ 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);
+ ret = nb_fd;
+end:
return ret;
}
switch (len) {
case sizeof(*lum):
break;
- case -1:
- if (errno == ECONNRESET) {
- fprintf(stderr, "remote end closed connection\n");
- return 0;
- }
- return -1;
default:
- fprintf(stderr, "incorrect message size: %zd\n", len);
- return -1;
+ if (len < 0) {
+ return len;
+ } else {
+ ERR("incorrect message size: %zd\n", len);
+ return -EINVAL;
+ }
}
return 0;
}
len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur));
switch (len) {
case 0: /* orderly shutdown */
- return -EINVAL;
+ return -EPIPE;
case sizeof(*lur):
+ {
+ int err = 0;
+
if (lur->handle != expected_handle) {
- fprintf(stderr, "Unexpected result message handle\n");
- return -EINVAL;
+ ERR("Unexpected result message handle: "
+ "expected: %u vs received: %u\n",
+ expected_handle, lur->handle);
+ err = 1;
}
-
if (lur->cmd != expected_cmd) {
- fprintf(stderr, "Unexpected result message command\n");
- return -EINVAL;
+ ERR("Unexpected result message command "
+ "expected: %u vs received: %u\n",
+ expected_cmd, lur->cmd);
+ err = 1;
}
- if (lur->ret_code != USTCOMM_OK) {
- /*
- * Some errors are normal.. we should put this
- * in a debug level message...
- * fprintf(stderr, "remote operation failed with code %d.\n",
- * lur->ret_code);
- */
- return lur->ret_code;
- }
- return 0;
- case -1:
- if (errno == ECONNRESET) {
- fprintf(stderr, "remote end closed connection\n");
+ if (err) {
return -EINVAL;
+ } else {
+ return lur->ret_code;
}
- return -1;
+ }
default:
- fprintf(stderr, "incorrect message size: %zd\n", len);
- return len > 0 ? -1 : len;
+ if (len >= 0) {
+ ERR("incorrect message size: %zd\n", len);
+ }
+ return len;
}
}
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_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;
+}
+
+int ustcomm_recv_stream_from_sessiond(int sock,
+ uint64_t *memory_map_size,
+ 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;
+}
+
+/*
+ * 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_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_ust_getprocname(reg_msg.name);
+ 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_type *lt)
+{
+ switch (lt->atype) {
+ case atype_integer:
+ case atype_float:
+ case atype_string:
+ case atype_enum:
+ case atype_array:
+ case atype_sequence:
+ return 1;
+ case atype_struct:
+ //TODO: implement non-empty struct.
+ return 1;
+ case atype_dynamic:
+ {
+ const struct lttng_event_field *choices;
+ size_t nr_choices;
+ int ret;
+
+ ret = lttng_ust_dynamic_type_choices(&nr_choices,
+ &choices);
+ if (ret)
+ return ret;
+ /*
+ * One field for enum, one field for variant, and
+ * one field per choice.
+ */
+ return count_fields_recursive(nr_choices, choices) + 2;
+ }
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+ssize_t count_fields_recursive(size_t nr_fields,
+ const struct lttng_event_field *lttng_fields)
+{
+ int i;
+ ssize_t ret, count = 0;
+
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_event_field *lf;
+
+ lf = <tng_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,
+ const struct lttng_ctx_field *lttng_fields)
+{
+ int i;
+ ssize_t ret, count = 0;
+
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_event_field *lf;
+
+ lf = <tng_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_string_encodings le)
+{
+ switch (le) {
+ case lttng_encode_none:
+ *ue = ustctl_encode_none;
+ break;
+ case lttng_encode_UTF8:
+ *ue = ustctl_encode_UTF8;
+ break;
+ case lttng_encode_ASCII:
+ *ue = ustctl_encode_ASCII;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+int serialize_integer_type(struct ustctl_integer_type *uit,
+ const struct lttng_integer_type *lit)
+{
+ 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, lit->encoding))
+ return -EINVAL;
+ uit->encoding = encoding;
+ uit->alignment = lit->alignment;
+ return 0;
+}
+
+static
+int serialize_basic_type(struct lttng_session *session,
+ enum ustctl_abstract_types *uatype,
+ enum lttng_abstract_types atype,
+ union _ustctl_basic_type *ubt,
+ const union _lttng_basic_type *lbt)
+{
+ switch (atype) {
+ case atype_integer:
+ {
+ if (serialize_integer_type(&ubt->integer, &lbt->integer))
+ return -EINVAL;
+ *uatype = ustctl_atype_integer;
+ break;
+ }
+ case atype_string:
+ {
+ int32_t encoding;
+
+ if (serialize_string_encoding(&encoding, lbt->string.encoding))
+ return -EINVAL;
+ ubt->string.encoding = encoding;
+ *uatype = ustctl_atype_string;
+ break;
+ }
+ case atype_float:
+ {
+ struct ustctl_float_type *uft;
+ const struct lttng_float_type *lft;
+
+ uft = &ubt->_float;
+ lft = &lbt->_float;
+ uft->exp_dig = lft->exp_dig;
+ uft->mant_dig = lft->mant_dig;
+ uft->alignment = lft->alignment;
+ uft->reverse_byte_order = lft->reverse_byte_order;
+ *uatype = ustctl_atype_float;
+ break;
+ }
+ case atype_enum:
+ {
+ strncpy(ubt->enumeration.name, lbt->enumeration.desc->name,
+ LTTNG_UST_SYM_NAME_LEN);
+ ubt->enumeration.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ if (serialize_integer_type(&ubt->enumeration.container_type,
+ &lbt->enumeration.container_type))
+ return -EINVAL;
+ if (session) {
+ const struct lttng_enum *_enum;
+
+ _enum = lttng_ust_enum_get_from_desc(session, lbt->enumeration.desc);
+ if (!_enum)
+ return -EINVAL;
+ ubt->enumeration.id = _enum->id;
+ } else {
+ ubt->enumeration.id = -1ULL;
+ }
+ *uatype = ustctl_atype_enum;
+ break;
+ }
+ case atype_array:
+ case atype_sequence:
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+int serialize_dynamic_type(struct lttng_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const struct lttng_event_field *lf)
+{
+ const struct lttng_event_field *choices;
+ char tag_field_name[LTTNG_UST_SYM_NAME_LEN];
+ const struct lttng_type *tag_type;
+ const struct lttng_event_field *tag_field_generic;
+ struct lttng_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, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ tag_field_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ strncat(tag_field_name,
+ "_tag",
+ LTTNG_UST_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, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ uf->type.atype = ustctl_atype_variant;
+ uf->type.u.variant.nr_choices = nr_choices;
+ strncpy(uf->type.u.variant.tag_name,
+ tag_field_name,
+ LTTNG_UST_SYM_NAME_LEN);
+ uf->type.u.variant.tag_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\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_field(struct lttng_session *session,
+ struct ustctl_field *fields, size_t *iter_output,
+ const struct lttng_event_field *lf)
+{
+ const struct lttng_type *lt = &lf->type;
+ int ret;
+
+ /* skip 'nowrite' fields */
+ if (lf->nowrite)
+ return 0;
+
+ switch (lt->atype) {
+ case atype_integer:
+ case atype_float:
+ case atype_string:
+ case atype_enum:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+ enum ustctl_abstract_types atype;
+
+ strncpy(uf->name, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ ret = serialize_basic_type(session, &atype, lt->atype,
+ &ut->u.basic, <->u.basic);
+ if (ret)
+ return ret;
+ ut->atype = atype;
+ (*iter_output)++;
+ break;
+ }
+ case atype_array:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+ struct ustctl_basic_type *ubt;
+ const struct lttng_basic_type *lbt;
+ enum ustctl_abstract_types atype;
+
+ strncpy(uf->name, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ uf->type.atype = ustctl_atype_array;
+ ubt = &ut->u.array.elem_type;
+ lbt = <->u.array.elem_type;
+ ut->u.array.length = lt->u.array.length;
+ ret = serialize_basic_type(session, &atype, lbt->atype,
+ &ubt->u.basic, &lbt->u.basic);
+ if (ret)
+ return -EINVAL;
+ ubt->atype = atype;
+ ut->atype = ustctl_atype_array;
+ (*iter_output)++;
+ break;
+ }
+ case atype_sequence:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+ struct ustctl_type *ut = &uf->type;
+ struct ustctl_basic_type *ubt;
+ const struct lttng_basic_type *lbt;
+ enum ustctl_abstract_types atype;
+ int ret;
+
+ strncpy(uf->name, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ uf->type.atype = ustctl_atype_sequence;
+ ubt = &ut->u.sequence.length_type;
+ lbt = <->u.sequence.length_type;
+ ret = serialize_basic_type(session, &atype, lbt->atype,
+ &ubt->u.basic, &lbt->u.basic);
+ if (ret)
+ return -EINVAL;
+ ubt->atype = atype;
+ ubt = &ut->u.sequence.elem_type;
+ lbt = <->u.sequence.elem_type;
+ ret = serialize_basic_type(session, &atype, lbt->atype,
+ &ubt->u.basic, &lbt->u.basic);
+ if (ret)
+ return -EINVAL;
+ ubt->atype = atype;
+ ut->atype = ustctl_atype_sequence;
+ (*iter_output)++;
+ break;
+ }
+ case atype_dynamic:
+ {
+ ret = serialize_dynamic_type(session, fields, iter_output, lf);
+ if (ret)
+ return -EINVAL;
+ break;
+ }
+ case atype_struct:
+ {
+ struct ustctl_field *uf = &fields[*iter_output];
+
+ /*
+ * TODO: add support for non-empty struct.
+ */
+ if (lf->type.u._struct.nr_fields != 0) {
+ return -EINVAL;
+ }
+ strncpy(uf->name, lf->name, LTTNG_UST_SYM_NAME_LEN);
+ uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ uf->type.atype = ustctl_atype_struct;
+ uf->type.u._struct.nr_fields = 0;
+ (*iter_output)++;
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
return 0;
}
+static
+int serialize_fields(struct lttng_session *session,
+ size_t *_nr_write_fields,
+ struct ustctl_field **ustctl_fields,
+ size_t nr_fields,
+ const struct lttng_event_field *lttng_fields)
+{
+ struct ustctl_field *fields;
+ int ret;
+ size_t i, 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;
+
+ for (i = 0; i < nr_fields; i++) {
+ ret = serialize_one_field(session, fields, &iter_output,
+ <tng_fields[i]);
+ 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_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_enum_entry *lentry;
+
+ uentry = &entries[i];
+ lentry = <tng_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_SYM_NAME_LEN);
+ uentry->string[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+
+ if (lentry->u.extra.options & LTTNG_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_session *session,
+ size_t *_nr_write_fields,
+ struct ustctl_field **ustctl_fields,
+ size_t nr_fields,
+ const struct lttng_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,
+ <tng_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;
+}
/*
- * Receives a single fd from socket.
- *
- * Returns the size of received data
+ * Returns 0 on success, negative error value on error.
*/
-int ustcomm_recv_fd(int sock)
+int ustcomm_register_event(int sock,
+ struct lttng_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_event_field *lttng_fields,
+ const char *model_emf_uri,
+ uint32_t *id) /* event id (output) */
{
- struct iovec iov[1];
- int ret = 0;
- int data_fd;
- struct cmsghdr *cmsg;
- char recv_fd[CMSG_SPACE(sizeof(int))];
- struct msghdr msg;
- union {
- unsigned char vc[4];
- int vi;
- } tmp;
- int i;
+ 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_SYM_NAME_LEN);
+ msg.m.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ msg.m.loglevel = loglevel;
+ signature_len = strlen(signature) + 1;
+ msg.m.signature_len = signature_len;
- /* Prepare to receive the structures */
- iov[0].iov_base = &data_fd;
- iov[0].iov_len = sizeof(data_fd);
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
- msg.msg_control = recv_fd;
- msg.msg_controllen = sizeof(recv_fd);
+ /* Calculate fields len, serialize fields. */
+ if (nr_fields > 0) {
+ ret = serialize_fields(session, &nr_write_fields, &fields,
+ nr_fields, lttng_fields);
+ if (ret)
+ return ret;
+ }
- if ((ret = recvmsg(sock, &msg, 0)) < 0) {
- perror("recvmsg");
- goto end;
+ 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;
}
- if (ret != sizeof(data_fd)) {
- fprintf(stderr, "Received %d bytes, expected %zd", ret, sizeof(data_fd));
- goto end;
+ 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;
}
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg) {
- fprintf(stderr, "Invalid control message header\n");
- ret = -1;
- goto end;
+ if (len < 0) {
+ ret = len;
+ goto error_fields;
}
- if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
- fprintf(stderr, "Didn't received any fd\n");
- ret = -1;
- goto end;
+
+ /* send signature */
+ len = ustcomm_send_unix_sock(sock, signature, signature_len);
+ if (len > 0 && len != signature_len) {
+ ret = -EIO;
+ goto error_fields;
}
- /* this is our fd */
- for (i = 0; i < sizeof(int); i++)
- tmp.vc[i] = CMSG_DATA(cmsg)[i];
- ret = tmp.vi;
- /*
- * Useful for fd leak debug.
- * fprintf(stderr, "received fd %d\n", ret);
- */
-end:
+ 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_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_SYM_NAME_LEN);
+ msg.m.enum_name[LTTNG_UST_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_session *session,
+ int session_objd, /* session descriptor */
+ int channel_objd, /* channel descriptor */
+ size_t nr_ctx_fields,
+ const struct lttng_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;
}
projects / lttng-ust.git / blobdiff