--- /dev/null
+/* Copyright (C) 2009 Pierre-Marc Fournier
+ * 2010 Alexis Halle
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/epoll.h>
+#include <sys/shm.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <signal.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <ust/ustconsumer.h>
+#include "lowlevel.h"
+#include "usterr.h"
+#include "ustcomm.h"
+
+#define GET_SUBBUF_OK 1
+#define GET_SUBBUF_DONE 0
+#define GET_SUBBUF_DIED 2
+
+#define PUT_SUBBUF_OK 1
+#define PUT_SUBBUF_DIED 0
+#define PUT_SUBBUF_PUSHED 2
+#define PUT_SUBBUF_DONE 3
+
+#define UNIX_PATH_MAX 108
+
+static int get_subbuffer(struct buffer_info *buf)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_buffer_info _send_msg, _recv_msg;
+ struct ustcomm_buffer_info *send_msg, *recv_msg;
+ int result;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ send_msg = &_send_msg;
+ recv_msg = &_recv_msg;
+
+ result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace,
+ buf->channel, buf->channel_cpu);
+ if (result < 0) {
+ return result;
+ }
+
+ send_hdr->command = GET_SUBBUFFER;
+
+ result = ustcomm_req(buf->app_sock, send_hdr, (char *)send_msg,
+ recv_hdr, (char *)recv_msg);
+ if ((result < 0 && (errno == ECONNRESET || errno == EPIPE)) ||
+ result == 0) {
+ DBG("app died while being traced");
+ return GET_SUBBUF_DIED;
+ } else if (result < 0) {
+ ERR("get_subbuffer: ustcomm_req failed");
+ return result;
+ }
+
+ if (!recv_hdr->result) {
+ DBG("got subbuffer %s", buf->name);
+ buf->consumed_old = recv_msg->consumed_old;
+ return GET_SUBBUF_OK;
+ } else if (recv_hdr->result == -ENODATA) {
+ DBG("For buffer %s, the trace was not found. This likely means"
+ " it was destroyed by the user.", buf->name);
+ return GET_SUBBUF_DIED;
+ }
+
+ DBG("error getting subbuffer %s", buf->name);
+ return recv_hdr->result;
+}
+
+static int put_subbuffer(struct buffer_info *buf)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_buffer_info _send_msg, *send_msg;
+ int result;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ send_msg = &_send_msg;
+
+ result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace,
+ buf->channel, buf->channel_cpu);
+ if (result < 0) {
+ return result;
+ }
+
+ send_hdr->command = PUT_SUBBUFFER;
+ send_msg->consumed_old = buf->consumed_old;
+
+ result = ustcomm_req(buf->app_sock, send_hdr, (char *)send_msg,
+ recv_hdr, NULL);
+ if ((result < 0 && (errno == ECONNRESET || errno == EPIPE)) ||
+ result == 0) {
+ DBG("app died while being traced");
+ return PUT_SUBBUF_DIED;
+ } else if (result < 0) {
+ ERR("put_subbuffer: ustcomm_req failed");
+ return result;
+ }
+
+ if (!recv_hdr->result) {
+ DBG("put subbuffer %s", buf->name);
+ return PUT_SUBBUF_OK;
+ } else if (recv_hdr->result == -ENODATA) {
+ DBG("For buffer %s, the trace was not found. This likely means"
+ " it was destroyed by the user.", buf->name);
+ return PUT_SUBBUF_DIED;
+ }
+
+ DBG("error getting subbuffer %s", buf->name);
+ return recv_hdr->result;
+}
+
+void decrement_active_buffers(void *arg)
+{
+ struct ustconsumer_instance *instance = arg;
+ pthread_mutex_lock(&instance->mutex);
+ instance->active_buffers--;
+ pthread_mutex_unlock(&instance->mutex);
+}
+
+static int get_pidunique(int sock, s64 *pidunique)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_pidunique _recv_msg, *recv_msg;
+ int result;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ recv_msg = &_recv_msg;
+
+ memset(send_hdr, 0, sizeof(*send_hdr));
+
+ send_hdr->command = GET_PIDUNIQUE;
+ result = ustcomm_req(sock, send_hdr, NULL, recv_hdr, (char *)recv_msg);
+ if (result < 1) {
+ return -ENOTCONN;
+ }
+ if (recv_hdr->result < 0) {
+ ERR("App responded with error: %s", strerror(recv_hdr->result));
+ return recv_hdr->result;
+ }
+
+ *pidunique = recv_msg->pidunique;
+
+ return 0;
+}
+
+static int get_buf_shmid_pipe_fd(int sock, struct buffer_info *buf,
+ int *buf_shmid, int *buf_struct_shmid,
+ int *buf_pipe_fd)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_buffer_info _send_msg, *send_msg;
+ struct ustcomm_buffer_info _recv_msg, *recv_msg;
+ int result, recv_pipe_fd;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ send_msg = &_send_msg;
+ recv_msg = &_recv_msg;
+
+ result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace,
+ buf->channel, buf->channel_cpu);
+ if (result < 0) {
+ ERR("Failed to pack buffer info");
+ return result;
+ }
+
+ send_hdr->command = GET_BUF_SHMID_PIPE_FD;
+
+ result = ustcomm_send(sock, send_hdr, (char *)send_msg);
+ if (result < 1) {
+ ERR("Failed to send request");
+ return -ENOTCONN;
+ }
+ result = ustcomm_recv_fd(sock, recv_hdr, (char *)recv_msg, &recv_pipe_fd);
+ if (result < 1) {
+ ERR("Failed to receive message and fd");
+ return -ENOTCONN;
+ }
+ if (recv_hdr->result < 0) {
+ ERR("App responded with error %s", strerror(recv_hdr->result));
+ return recv_hdr->result;
+ }
+
+ *buf_shmid = recv_msg->buf_shmid;
+ *buf_struct_shmid = recv_msg->buf_struct_shmid;
+ *buf_pipe_fd = recv_pipe_fd;
+
+ return 0;
+}
+
+static int get_subbuf_num_size(int sock, struct buffer_info *buf,
+ int *subbuf_num, int *subbuf_size)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_channel_info _send_msg, *send_msg;
+ struct ustcomm_channel_info _recv_msg, *recv_msg;
+ int result;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ send_msg = &_send_msg;
+ recv_msg = &_recv_msg;
+
+ result = ustcomm_pack_channel_info(send_hdr, send_msg, buf->trace,
+ buf->channel);
+ if (result < 0) {
+ return result;
+ }
+
+ send_hdr->command = GET_SUBBUF_NUM_SIZE;
+
+ result = ustcomm_req(sock, send_hdr, (char *)send_msg,
+ recv_hdr, (char *)recv_msg);
+ if (result < 1) {
+ return -ENOTCONN;
+ }
+
+ *subbuf_num = recv_msg->subbuf_num;
+ *subbuf_size = recv_msg->subbuf_size;
+
+ return recv_hdr->result;
+}
+
+
+static int notify_buffer_mapped(int sock, struct buffer_info *buf)
+{
+ struct ustcomm_header _send_hdr, *send_hdr;
+ struct ustcomm_header _recv_hdr, *recv_hdr;
+ struct ustcomm_buffer_info _send_msg, *send_msg;
+ int result;
+
+ send_hdr = &_send_hdr;
+ recv_hdr = &_recv_hdr;
+ send_msg = &_send_msg;
+
+ result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace,
+ buf->channel, buf->channel_cpu);
+ if (result < 0) {
+ return result;
+ }
+
+ send_hdr->command = NOTIFY_BUF_MAPPED;
+
+ result = ustcomm_req(sock, send_hdr, (char *)send_msg,
+ recv_hdr, NULL);
+ if (result < 1) {
+ return -ENOTCONN;
+ }
+
+ return recv_hdr->result;
+}
+
+
+struct buffer_info *connect_buffer(struct ustconsumer_instance *instance, pid_t pid,
+ const char *trace, const char *channel,
+ int channel_cpu)
+{
+ struct buffer_info *buf;
+ int result;
+ struct shmid_ds shmds;
+
+ buf = (struct buffer_info *) zmalloc(sizeof(struct buffer_info));
+ if(buf == NULL) {
+ ERR("add_buffer: insufficient memory");
+ return NULL;
+ }
+
+ buf->trace = strdup(trace);
+ if (!buf->trace) {
+ goto free_buf;
+ }
+
+ buf->channel = strdup(channel);
+ if (!buf->channel) {
+ goto free_buf_trace;
+ }
+
+ result = asprintf(&buf->name, "%s_%d", channel, channel_cpu);
+ if (result < 0 || buf->name == NULL) {
+ goto free_buf_channel;
+ }
+
+ buf->channel_cpu = channel_cpu;
+ buf->pid = pid;
+
+ result = ustcomm_connect_app(buf->pid, &buf->app_sock);
+ if(result) {
+ WARN("unable to connect to process, it probably died before we were able to connect");
+ goto free_buf_name;
+ }
+
+ /* get pidunique */
+ result = get_pidunique(buf->app_sock, &buf->pidunique);
+ if (result < 0) {
+ ERR("Failed to get pidunique");
+ goto close_app_sock;
+ }
+
+ /* get shmid and pipe fd */
+ result = get_buf_shmid_pipe_fd(buf->app_sock, buf, &buf->shmid,
+ &buf->bufstruct_shmid, &buf->pipe_fd);
+ if (result < 0) {
+ ERR("Failed to get buf_shmid and pipe_fd");
+ goto close_app_sock;
+ } else {
+ struct stat temp;
+ fstat(buf->pipe_fd, &temp);
+ if (!S_ISFIFO(temp.st_mode)) {
+ ERR("Didn't receive a fifo from the app");
+ goto close_app_sock;
+ }
+ }
+
+
+ /* get number of subbufs and subbuf size */
+ result = get_subbuf_num_size(buf->app_sock, buf, &buf->n_subbufs,
+ &buf->subbuf_size);
+ if (result < 0) {
+ ERR("Failed to get subbuf number and size");
+ goto close_fifo;
+ }
+
+ /* attach memory */
+ buf->mem = shmat(buf->shmid, NULL, 0);
+ if(buf->mem == (void *) 0) {
+ PERROR("shmat");
+ goto close_fifo;
+ }
+ DBG("successfully attached buffer memory");
+
+ buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0);
+ if(buf->bufstruct_mem == (void *) 0) {
+ PERROR("shmat");
+ goto shmdt_mem;
+ }
+ DBG("successfully attached buffer bufstruct memory");
+
+ /* obtain info on the memory segment */
+ result = shmctl(buf->shmid, IPC_STAT, &shmds);
+ if(result == -1) {
+ PERROR("shmctl");
+ goto shmdt_bufstruct_mem;
+ }
+ buf->memlen = shmds.shm_segsz;
+
+ /* Notify the application that we have mapped the buffer */
+ result = notify_buffer_mapped(buf->app_sock, buf);
+ if (result < 0) {
+ goto shmdt_bufstruct_mem;
+ }
+
+ if(instance->callbacks->on_open_buffer)
+ instance->callbacks->on_open_buffer(instance->callbacks, buf);
+
+ pthread_mutex_lock(&instance->mutex);
+ instance->active_buffers++;
+ pthread_mutex_unlock(&instance->mutex);
+
+ return buf;
+
+shmdt_bufstruct_mem:
+ shmdt(buf->bufstruct_mem);
+
+shmdt_mem:
+ shmdt(buf->mem);
+
+close_fifo:
+ close(buf->pipe_fd);
+
+close_app_sock:
+ close(buf->app_sock);
+
+free_buf_name:
+ free(buf->name);
+
+free_buf_channel:
+ free(buf->channel);
+
+free_buf_trace:
+ free(buf->trace);
+
+free_buf:
+ free(buf);
+ return NULL;
+}
+
+static void destroy_buffer(struct ustconsumer_callbacks *callbacks,
+ struct buffer_info *buf)
+{
+ int result;
+
+ result = close(buf->app_sock);
+ if(result == -1) {
+ WARN("problem calling ustcomm_close_app");
+ }
+
+ result = shmdt(buf->mem);
+ if(result == -1) {
+ PERROR("shmdt");
+ }
+
+ result = shmdt(buf->bufstruct_mem);
+ if(result == -1) {
+ PERROR("shmdt");
+ }
+
+ if(callbacks->on_close_buffer)
+ callbacks->on_close_buffer(callbacks, buf);
+
+ free(buf);
+}
+
+int consumer_loop(struct ustconsumer_instance *instance, struct buffer_info *buf)
+{
+ int result, read_result;
+ char read_buf;
+
+ pthread_cleanup_push(decrement_active_buffers, instance);
+
+ for(;;) {
+ read_result = read(buf->pipe_fd, &read_buf, 1);
+ /* get the subbuffer */
+ if (read_result == 1) {
+ result = get_subbuffer(buf);
+ if (result < 0) {
+ ERR("error getting subbuffer");
+ continue;
+ } else if (result == GET_SUBBUF_DIED) {
+ finish_consuming_dead_subbuffer(instance->callbacks, buf);
+ break;
+ }
+ } else if ((read_result == -1 && (errno == ECONNRESET || errno == EPIPE)) ||
+ result == 0) {
+ DBG("App died while being traced");
+ finish_consuming_dead_subbuffer(instance->callbacks, buf);
+ break;
+ }
+
+ if(instance->callbacks->on_read_subbuffer)
+ instance->callbacks->on_read_subbuffer(instance->callbacks, buf);
+
+ /* put the subbuffer */
+ result = put_subbuffer(buf);
+ if(result == -1) {
+ ERR("unknown error putting subbuffer (channel=%s)", buf->name);
+ break;
+ }
+ else if(result == PUT_SUBBUF_PUSHED) {
+ ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name);
+ break;
+ }
+ else if(result == PUT_SUBBUF_DIED) {
+ DBG("application died while putting subbuffer");
+ /* Skip the first subbuffer. We are not sure it is trustable
+ * because the put_subbuffer() did not complete.
+ */
+ if(instance->callbacks->on_put_error)
+ instance->callbacks->on_put_error(instance->callbacks, buf);
+
+ finish_consuming_dead_subbuffer(instance->callbacks, buf);
+ break;
+ }
+ else if(result == PUT_SUBBUF_DONE) {
+ /* Done with this subbuffer */
+ /* FIXME: add a case where this branch is used? Upon
+ * normal trace termination, at put_subbuf time, a
+ * special last-subbuffer code could be returned by
+ * the listener.
+ */
+ break;
+ }
+ else if(result == PUT_SUBBUF_OK) {
+ }
+ }
+
+ DBG("thread for buffer %s is stopping", buf->name);
+
+ /* FIXME: destroy, unalloc... */
+
+ pthread_cleanup_pop(1);
+
+ return 0;
+}
+
+struct consumer_thread_args {
+ pid_t pid;
+ const char *trace;
+ const char *channel;
+ int channel_cpu;
+ struct ustconsumer_instance *instance;
+};
+
+void *consumer_thread(void *arg)
+{
+ struct buffer_info *buf;
+ struct consumer_thread_args *args = (struct consumer_thread_args *) arg;
+ int result;
+ sigset_t sigset;
+
+ if(args->instance->callbacks->on_new_thread)
+ args->instance->callbacks->on_new_thread(args->instance->callbacks);
+
+ /* Block signals that should be handled by the main thread. */
+ result = sigemptyset(&sigset);
+ if(result == -1) {
+ PERROR("sigemptyset");
+ goto end;
+ }
+ result = sigaddset(&sigset, SIGTERM);
+ if(result == -1) {
+ PERROR("sigaddset");
+ goto end;
+ }
+ result = sigaddset(&sigset, SIGINT);
+ if(result == -1) {
+ PERROR("sigaddset");
+ goto end;
+ }
+ result = sigprocmask(SIG_BLOCK, &sigset, NULL);
+ if(result == -1) {
+ PERROR("sigprocmask");
+ goto end;
+ }
+
+ buf = connect_buffer(args->instance, args->pid, args->trace,
+ args->channel, args->channel_cpu);
+ if(buf == NULL) {
+ ERR("failed to connect to buffer");
+ goto end;
+ }
+
+ consumer_loop(args->instance, buf);
+
+ destroy_buffer(args->instance->callbacks, buf);
+
+ end:
+
+ if(args->instance->callbacks->on_close_thread)
+ args->instance->callbacks->on_close_thread(args->instance->callbacks);
+
+ free((void *)args->channel);
+ free(args);
+ return NULL;
+}
+
+int start_consuming_buffer(struct ustconsumer_instance *instance, pid_t pid,
+ const char *trace, const char *channel,
+ int channel_cpu)
+{
+ pthread_t thr;
+ struct consumer_thread_args *args;
+ int result;
+
+ DBG("beginning of start_consuming_buffer: args: pid %d bufname %s_%d", pid, channel,
+ channel_cpu);
+
+ args = (struct consumer_thread_args *) zmalloc(sizeof(struct consumer_thread_args));
+ if (!args) {
+ return -ENOMEM;
+ }
+
+ args->pid = pid;
+ args->trace = strdup(trace);
+ args->channel = strdup(channel);
+ args->channel_cpu = channel_cpu;
+ args->instance = instance;
+ DBG("beginning2 of start_consuming_buffer: args: pid %d trace %s"
+ " bufname %s_%d", args->pid, args->channel, args->channel_cpu);
+
+ result = pthread_create(&thr, NULL, consumer_thread, args);
+ if(result == -1) {
+ ERR("pthread_create failed");
+ return -1;
+ }
+ result = pthread_detach(thr);
+ if(result == -1) {
+ ERR("pthread_detach failed");
+ return -1;
+ }
+ DBG("end of start_consuming_buffer: args: pid %d trace %s "
+ "bufname %s_%d", args->pid, args->channel, args->channel_cpu);
+
+ return 0;
+}
+static void process_client_cmd(int sock, struct ustcomm_header *req_header,
+ char *recvbuf, struct ustconsumer_instance *instance)
+{
+ int result;
+ struct ustcomm_header _res_header;
+ struct ustcomm_header *res_header = &_res_header;
+ struct ustcomm_buffer_info *buf_inf;
+
+ DBG("Processing client command");
+
+ switch (req_header->command) {
+ case CONSUME_BUFFER:
+
+ buf_inf = (struct ustcomm_buffer_info *)recvbuf;
+ result = ustcomm_unpack_buffer_info(buf_inf);
+ if (result < 0) {
+ ERR("Couldn't unpack buffer info");
+ return;
+ }
+
+ DBG("Going to consume trace %s buffer %s_%d in process %d",
+ buf_inf->trace, buf_inf->channel, buf_inf->ch_cpu,
+ buf_inf->pid);
+ result = start_consuming_buffer(instance, buf_inf->pid,
+ buf_inf->trace,
+ buf_inf->channel,
+ buf_inf->ch_cpu);
+ if (result < 0) {
+ ERR("error in add_buffer");
+ return;
+ }
+
+ res_header->result = 0;
+ break;
+ case EXIT:
+ res_header->result = 0;
+ /* Only there to force poll to return */
+ break;
+ default:
+ res_header->result = -EINVAL;
+ WARN("unknown command: %d", req_header->command);
+ }
+
+ if (ustcomm_send(sock, res_header, NULL) <= 0) {
+ ERR("couldn't send command response");
+ }
+}
+
+#define MAX_EVENTS 10
+
+int ustconsumer_start_instance(struct ustconsumer_instance *instance)
+{
+ struct ustcomm_header recv_hdr;
+ char recv_buf[USTCOMM_BUFFER_SIZE];
+ struct ustcomm_sock *epoll_sock;
+ struct epoll_event events[MAX_EVENTS];
+ struct sockaddr addr;
+ int result, epoll_fd, accept_fd, nfds, i, addr_size, timeout;
+
+ if(!instance->is_init) {
+ ERR("libustconsumer instance not initialized");
+ return 1;
+ }
+ epoll_fd = instance->epoll_fd;
+
+ timeout = -1;
+
+ /* app loop */
+ for(;;) {
+ nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, timeout);
+ if (nfds == -1 && errno == EINTR) {
+ /* Caught signal */
+ } else if (nfds == -1) {
+ PERROR("ustconsumer_start_instance: epoll_wait failed");
+ continue;
+ }
+
+ for (i = 0; i < nfds; ++i) {
+ epoll_sock = (struct ustcomm_sock *)events[i].data.ptr;
+ if (epoll_sock == instance->listen_sock) {
+ addr_size = sizeof(struct sockaddr);
+ accept_fd = accept(epoll_sock->fd,
+ &addr,
+ (socklen_t *)&addr_size);
+ if (accept_fd == -1) {
+ PERROR("ustconsumer_start_instance: "
+ "accept failed");
+ continue;
+ }
+ ustcomm_init_sock(accept_fd, epoll_fd,
+ &instance->connections);
+ } else {
+ result = ustcomm_recv(epoll_sock->fd, &recv_hdr,
+ recv_buf);
+ if (result < 1) {
+ ustcomm_del_sock(epoll_sock, 0);
+ } else {
+ process_client_cmd(epoll_sock->fd,
+ &recv_hdr, recv_buf,
+ instance);
+ }
+
+ }
+ }
+
+ if (instance->quit_program) {
+ pthread_mutex_lock(&instance->mutex);
+ if(instance->active_buffers == 0) {
+ pthread_mutex_unlock(&instance->mutex);
+ break;
+ }
+ pthread_mutex_unlock(&instance->mutex);
+ timeout = 100;
+ }
+ }
+
+ if(instance->callbacks->on_trace_end)
+ instance->callbacks->on_trace_end(instance);
+
+ ustconsumer_delete_instance(instance);
+
+ return 0;
+}
+
+/* FIXME: threads and connections !? */
+void ustconsumer_delete_instance(struct ustconsumer_instance *instance)
+{
+ if (instance->is_init) {
+ ustcomm_del_named_sock(instance->listen_sock, 0);
+ close(instance->epoll_fd);
+ }
+
+ pthread_mutex_destroy(&instance->mutex);
+ free(instance->sock_path);
+ free(instance);
+}
+
+/* FIXME: Do something about the fixed path length, maybe get rid
+ * of the whole concept and use a pipe?
+ */
+int ustconsumer_stop_instance(struct ustconsumer_instance *instance, int send_msg)
+{
+ int result;
+ int fd;
+ int bytes = 0;
+
+ char msg[] = "exit";
+
+ instance->quit_program = 1;
+
+ if(!send_msg)
+ return 0;
+
+ /* Send a message through the socket to force poll to return */
+
+ struct sockaddr_un addr;
+
+ result = fd = socket(PF_UNIX, SOCK_STREAM, 0);
+ if(result == -1) {
+ PERROR("socket");
+ return 1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ strncpy(addr.sun_path, instance->sock_path, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX-1] = '\0';
+
+ result = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if(result == -1) {
+ PERROR("connect");
+ }
+
+ while(bytes != sizeof(msg))
+ bytes += send(fd, msg, sizeof(msg), 0);
+
+ close(fd);
+
+ return 0;
+}
+
+struct ustconsumer_instance
+*ustconsumer_new_instance(struct ustconsumer_callbacks *callbacks,
+ char *sock_path)
+{
+ struct ustconsumer_instance *instance =
+ zmalloc(sizeof(struct ustconsumer_instance));
+ if(!instance) {
+ return NULL;
+ }
+
+ instance->callbacks = callbacks;
+ instance->quit_program = 0;
+ instance->is_init = 0;
+ instance->active_buffers = 0;
+ pthread_mutex_init(&instance->mutex, NULL);
+
+ if (sock_path) {
+ instance->sock_path = strdup(sock_path);
+ } else {
+ instance->sock_path = NULL;
+ }
+
+ return instance;
+}
+
+static int init_ustconsumer_socket(struct ustconsumer_instance *instance)
+{
+ char *name;
+
+ if (instance->sock_path) {
+ if (asprintf(&name, "%s", instance->sock_path) < 0) {
+ ERR("ustcomm_init_ustconsumer : asprintf failed (sock_path %s)",
+ instance->sock_path);
+ return -1;
+ }
+ } else {
+ int result;
+
+ /* Only check if socket dir exists if we are using the default directory */
+ result = ensure_dir_exists(SOCK_DIR);
+ if (result == -1) {
+ ERR("Unable to create socket directory %s", SOCK_DIR);
+ return -1;
+ }
+
+ if (asprintf(&name, "%s/%s", SOCK_DIR, "ustconsumer") < 0) {
+ ERR("ustcomm_init_ustconsumer : asprintf failed (%s/ustconsumer)",
+ SOCK_DIR);
+ return -1;
+ }
+ }
+
+ /* Set up epoll */
+ instance->epoll_fd = epoll_create(MAX_EVENTS);
+ if (instance->epoll_fd == -1) {
+ ERR("epoll_create failed, start instance bailing");
+ goto free_name;
+ }
+
+ /* Create the named socket */
+ instance->listen_sock = ustcomm_init_named_socket(name,
+ instance->epoll_fd);
+ if(!instance->listen_sock) {
+ ERR("error initializing named socket at %s", name);
+ goto close_epoll;
+ }
+
+ CDS_INIT_LIST_HEAD(&instance->connections);
+
+ free(name);
+
+ return 0;
+
+close_epoll:
+ close(instance->epoll_fd);
+free_name:
+ free(name);
+
+ return -1;
+}
+
+int ustconsumer_init_instance(struct ustconsumer_instance *instance)
+{
+ int result;
+ result = init_ustconsumer_socket(instance);
+ if(result == -1) {
+ ERR("failed to initialize socket");
+ return 1;
+ }
+ instance->is_init = 1;
+ return 0;
+}
+
projects / ust.git / blobdiff