-/*
- * Copyright (C) 2009 Pierre-Marc Fournier
+/* Copyright (C) 2009 Pierre-Marc Fournier
*
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ * 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 program is distributed in the hope that it will be useful,
+ * 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 General Public License for more details.
+ * 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 General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ * 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 <fcntl.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 "ustd.h"
#include "localerr.h"
#include "ustcomm.h"
-struct list_head buffers = LIST_HEAD_INIT(buffers);
-
-struct buffer_info {
- char *name;
- pid_t pid;
- struct ustcomm_connection conn;
-
- int shmid;
- int bufstruct_shmid;
-
- /* the buffer memory */
- void *mem;
- /* buffer size */
- int memlen;
- /* number of subbuffers in buffer */
- int n_subbufs;
- /* size of each subbuffer */
- int subbuf_size;
-
- /* the buffer information struct */
- void *bufstruct_mem;
-
- int file_fd; /* output file */
-
- struct list_head list;
-
- long consumed_old;
-};
-
/* return value: 0 = subbuffer is finished, it won't produce data anymore
* 1 = got subbuffer successfully
* <0 = error
#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
+
+int test_sigpipe(void)
+{
+ sigset_t sigset;
+ int result;
+
+ result = sigemptyset(&sigset);
+ if(result == -1) {
+ perror("sigemptyset");
+ return -1;
+ }
+ result = sigaddset(&sigset, SIGPIPE);
+ if(result == -1) {
+ perror("sigaddset");
+ return -1;
+ }
+
+ result = sigtimedwait(&sigset, NULL, &(struct timespec){0,0});
+ if(result == -1 && errno == EAGAIN) {
+ /* no signal received */
+ return 0;
+ }
+ else if(result == -1) {
+ perror("sigtimedwait");
+ return -1;
+ }
+ else if(result == SIGPIPE) {
+ /* received sigpipe */
+ return 1;
+ }
+ else {
+ assert(0);
+ }
+}
+
int get_subbuffer(struct buffer_info *buf)
{
char *send_msg;
asprintf(&send_msg, "get_subbuffer %s", buf->name);
result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
- if(result < 0) {
+ if(test_sigpipe()) {
+ WARN("process %d destroyed before we could connect to it", buf->pid);
+ return GET_SUBBUF_DONE;
+ }
+ else if(result < 0) {
ERR("get_subbuffer: ustcomm_send_request failed");
return -1;
}
if(!strcmp(rep_code, "OK")) {
DBG("subbuffer put %s", buf->name);
- retval = 1;
+ retval = PUT_SUBBUF_OK;
}
else {
- ERR("invalid response to put_subbuffer");
+ DBG("put_subbuffer: received error, we were pushed");
+ return PUT_SUBBUF_PUSHED;
}
free(rep_code);
return retval;
}
+/* This write is patient because it restarts if it was incomplete.
+ */
+
ssize_t patient_write(int fd, const void *buf, size_t count)
{
const char *bufc = (const char *) buf;
return bufc-(const char *)buf;
}
-int get_subbuffer_died(struct buffer_info *buf)
-{
- return 0;
-}
-
-//int ltt_do_get_subbuf(struct rchan_buf *buf, struct ltt_channel_buf_struct *ltt_buf, long *pconsumed_old)
-//{
-// struct ltt_channel_buf_struct *ltt_buf = buf->bufstruct_mem;
-//
-////ust// struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)buf->chan->private_data;
-// long consumed_old, consumed_idx, commit_count, write_offset;
-// consumed_old = atomic_long_read(<t_buf->consumed);
-// consumed_idx = SUBBUF_INDEX(consumed_old, buf->chan);
-// commit_count = local_read(<t_buf->commit_count[consumed_idx]);
-// /*
-// * Make sure we read the commit count before reading the buffer
-// * data and the write offset. Correct consumed offset ordering
-// * wrt commit count is insured by the use of cmpxchg to update
-// * the consumed offset.
-// */
-// smp_rmb();
-// write_offset = local_read(<t_buf->offset);
-// /*
-// * Check that the subbuffer we are trying to consume has been
-// * already fully committed.
-// */
-// if (((commit_count - buf->chan->subbuf_size)
-// & ltt_channel->commit_count_mask)
-// - (BUFFER_TRUNC(consumed_old, buf->chan)
-// >> ltt_channel->n_subbufs_order)
-// != 0) {
-// return -EAGAIN;
-// }
-// /*
-// * Check that we are not about to read the same subbuffer in
-// * which the writer head is.
-// */
-// if ((SUBBUF_TRUNC(write_offset, buf->chan)
-// - SUBBUF_TRUNC(consumed_old, buf->chan))
-// == 0) {
-// return -EAGAIN;
-// }
-//
-// *pconsumed_old = consumed_old;
-// return 0;
-//}
-
void *consumer_thread(void *arg)
{
struct buffer_info *buf = (struct buffer_info *) arg;
int result;
- int died = 0;
for(;;) {
/* get the subbuffer */
- if(died == 0) {
- result = get_subbuffer(buf);
- if(result == -1) {
- ERR("error getting subbuffer");
- continue;
- }
- else if(result == GET_SUBBUF_DONE) {
- /* this is done */
- break;
- }
- else if(result == GET_SUBBUF_DIED) {
- died = 1;
- }
+ result = get_subbuffer(buf);
+ if(result == -1) {
+ ERR("error getting subbuffer");
+ continue;
}
- if(died == 1) {
- result = get_subbuffer_died(buf);
- if(result <= 0) {
- break;
- }
+ else if(result == GET_SUBBUF_DONE) {
+ /* this is done */
+ break;
+ }
+ else if(result == GET_SUBBUF_DIED) {
+ finish_consuming_dead_subbuffer(buf);
+ break;
}
/* write data to file */
}
/* put the subbuffer */
- if(died == 0) {
- result = put_subbuffer(buf);
- if(result == -1) {
- ERR("error putting subbuffer");
- break;
- }
+ 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 {
-// result = put_subbuffer_died(buf);
+ else if(result == PUT_SUBBUF_DIED) {
+ WARN("application died while putting subbuffer");
+ /* FIXME: probably need to skip the first subbuffer in finish_consuming_dead_subbuffer */
+ finish_consuming_dead_subbuffer(buf);
+ }
+ else if(result == PUT_SUBBUF_OK) {
}
}
char *tmp;
int fd;
pthread_t thr;
+ struct shmid_ds shmds;
buf = (struct buffer_info *) malloc(sizeof(struct buffer_info));
if(buf == NULL) {
/* connect to app */
result = ustcomm_connect_app(buf->pid, &buf->conn);
if(result) {
- ERR("unable to connect to process");
+ WARN("unable to connect to process, it probably died before we were able to connect");
return -1;
}
/* get shmid */
asprintf(&send_msg, "get_shmid %s", buf->name);
- ustcomm_send_request(&buf->conn, send_msg, &received_msg);
+ result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
- DBG("got buffer name %s", buf->name);
+ if(result == -1) {
+ ERR("problem in ustcomm_send_request(get_shmid)");
+ return -1;
+ }
result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid);
if(result != 2) {
/* get n_subbufs */
asprintf(&send_msg, "get_n_subbufs %s", buf->name);
- ustcomm_send_request(&buf->conn, send_msg, &received_msg);
+ result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
+ if(result == -1) {
+ ERR("problem in ustcomm_send_request(g_n_subbufs)");
+ return -1;
+ }
result = sscanf(received_msg, "%d", &buf->n_subbufs);
if(result != 1) {
}
DBG("successfully attached buffer bufstruct memory");
+ /* obtain info on the memory segment */
+ result = shmctl(buf->shmid, IPC_STAT, &shmds);
+ if(result == -1) {
+ perror("shmctl");
+ return -1;
+ }
+ buf->memlen = shmds.shm_segsz;
+
/* open file for output */
asprintf(&tmp, "/tmp/trace/%s_0", buf->name);
result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600);
if(result == -1) {
PERROR("open");
+ ERR("failed opening trace file %s", tmp);
return -1;
}
buf->file_fd = fd;
free(tmp);
- //list_add(&buf->list, &buffers);
-
pthread_create(&thr, NULL, consumer_thread, buf);
return 0;
{
struct ustcomm_ustd ustd;
int result;
+ sigset_t sigset;
result = ustcomm_init_ustd(&ustd);
if(result == -1) {
return 1;
}
+ result = sigemptyset(&sigset);
+ if(result == -1) {
+ perror("sigemptyset");
+ return 1;
+ }
+ result = sigaddset(&sigset, SIGPIPE);
+ if(result == -1) {
+ perror("sigaddset");
+ return 1;
+ }
+ result = sigprocmask(SIG_BLOCK, &sigset, NULL);
+ if(result == -1) {
+ perror("sigprocmask");
+ return 1;
+ }
+
/* app loop */
for(;;) {
char *recvbuf;
projects / ust.git / blobdiff