+/*
+ * 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 program 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/shm.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
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_OK 1
+#define GET_SUBBUF_DONE 0
+#define GET_SUBBUF_DIED 2
+
+int get_subbuffer(struct buffer_info *buf)
+{
+ char *send_msg;
+ char *received_msg;
+ char *rep_code;
+ int retval;
+ int result;
+
+ asprintf(&send_msg, "get_subbuffer %s", buf->name);
+ result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
+ free(send_msg);
+ if(result < 0) {
+ ERR("get_subbuffer: ustcomm_send_request failed");
+ return -1;
+ }
+ else if(result == 0) {
+ DBG("app died while being traced");
+ return GET_SUBBUF_DIED;
+ }
+
+ result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old);
+ if(result != 2 && result != 1) {
+ ERR("unable to parse response to get_subbuffer");
+ return -1;
+ }
+
+ DBG("received msg is %s", received_msg);
+
+ if(!strcmp(rep_code, "OK")) {
+ DBG("got subbuffer %s", buf->name);
+ retval = GET_SUBBUF_OK;
+ }
+ else if(nth_token_is(received_msg, "END", 0) == 1) {
+ return GET_SUBBUF_DONE;
+ }
+ else {
+ DBG("error getting subbuffer %s", buf->name);
+ retval = -1;
+ }
+
+ /* FIMXE: free correctly the stuff */
+ free(received_msg);
+ free(rep_code);
+ return retval;
+}
+
+int put_subbuffer(struct buffer_info *buf)
+{
+ char *send_msg;
+ char *received_msg;
+ char *rep_code;
+ int retval;
+ int result;
+
+ asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old);
+ result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
+ if(result < 0) {
+ ERR("put_subbuffer: send_message failed");
+ return -1;
+ }
+ free(send_msg);
+
+ result = sscanf(received_msg, "%as", &rep_code);
+ if(result != 1) {
+ ERR("unable to parse response to put_subbuffer");
+ return -1;
+ }
+ free(received_msg);
+
+ if(!strcmp(rep_code, "OK")) {
+ DBG("subbuffer put %s", buf->name);
+ retval = 1;
+ }
+ else {
+ ERR("invalid response to put_subbuffer");
+ }
+
+ free(rep_code);
+ return retval;
+}
+
+ssize_t patient_write(int fd, const void *buf, size_t count)
+{
+ const char *bufc = (const char *) buf;
+ int result;
+
+ for(;;) {
+ result = write(fd, bufc, count);
+ if(result <= 0) {
+ return result;
+ }
+ count -= result;
+ bufc += result;
+
+ if(count == 0) {
+ break;
+ }
+ }
+
+ 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;
+ }
+ }
+ if(died == 1) {
+ result = get_subbuffer_died(buf);
+ if(result <= 0) {
+ break;
+ }
+ }
+
+ /* write data to file */
+ result = patient_write(buf->file_fd, buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)), buf->subbuf_size);
+ if(result == -1) {
+ PERROR("write");
+ /* FIXME: maybe drop this trace */
+ }
+
+ /* put the subbuffer */
+ if(died == 0) {
+ result = put_subbuffer(buf);
+ if(result == -1) {
+ ERR("error putting subbuffer");
+ break;
+ }
+ }
+ else {
+// result = put_subbuffer_died(buf);
+ }
+ }
+
+ DBG("thread for buffer %s is stopping", buf->name);
+
+ /* FIXME: destroy, unalloc... */
+
+ return NULL;
+}
+
int add_buffer(pid_t pid, char *bufname)
{
struct buffer_info *buf;
char *send_msg;
char *received_msg;
int result;
+ char *tmp;
+ int fd;
+ pthread_t thr;
buf = (struct buffer_info *) malloc(sizeof(struct buffer_info));
if(buf == NULL) {
buf->name = bufname;
buf->pid = pid;
+ /* connect to app */
+ result = ustcomm_connect_app(buf->pid, &buf->conn);
+ if(result) {
+ ERR("unable to connect to process");
+ return -1;
+ }
+
/* get shmid */
asprintf(&send_msg, "get_shmid %s", buf->name);
- send_message(pid, send_msg, &received_msg);
+ ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
DBG("got buffer name %s", buf->name);
- result = sscanf(received_msg, "%d", &buf->shmid);
- if(result != 1) {
+ result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid);
+ if(result != 2) {
ERR("unable to parse response to get_shmid");
return -1;
}
free(received_msg);
- DBG("got shmid %d", buf->shmid);
+ DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid);
/* get n_subbufs */
asprintf(&send_msg, "get_n_subbufs %s", buf->name);
- send_message(pid, send_msg, &received_msg);
+ ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
result = sscanf(received_msg, "%d", &buf->n_subbufs);
/* get subbuf size */
asprintf(&send_msg, "get_subbuf_size %s", buf->name);
- send_message(pid, send_msg, &received_msg);
+ ustcomm_send_request(&buf->conn, send_msg, &received_msg);
free(send_msg);
result = sscanf(received_msg, "%d", &buf->subbuf_size);
perror("shmat");
return -1;
}
- DBG("successfully attached memory");
+ DBG("successfully attached buffer memory");
+
+ buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0);
+ if(buf->bufstruct_mem == (void *) 0) {
+ perror("shmat");
+ return -1;
+ }
+ DBG("successfully attached buffer bufstruct memory");
+
+ /* 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");
+ return -1;
+ }
+ buf->file_fd = fd;
+ free(tmp);
+
+ //list_add(&buf->list, &buffers);
+
+ pthread_create(&thr, NULL, consumer_thread, buf);
return 0;
}
return 1;
}
+ /* app loop */
for(;;) {
char *recvbuf;
- ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL);
+ /* check for requests on our public socket */
+ result = ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL, 100);
+ if(result == -1) {
+ ERR("error in ustcomm_ustd_recv_message");
+ continue;
+ }
+ if(result > 0) {
+ if(!strncmp(recvbuf, "collect", 7)) {
+ pid_t pid;
+ char *bufname;
+ int result;
- if(!strncmp(recvbuf, "collect", 7)) {
- pid_t pid;
- char *bufname;
- int result;
+ result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname);
+ if(result != 2) {
+ fprintf(stderr, "parsing error: %s\n", recvbuf);
+ }
- result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname);
- if(result != 2) {
- fprintf(stderr, "parsing error: %s\n", recvbuf);
+ result = add_buffer(pid, bufname);
+ if(result < 0) {
+ ERR("error in add_buffer");
+ continue;
+ }
}
- add_buffer(pid, bufname);
-
+ free(recvbuf);
}
-
- free(recvbuf);
}
return 0;
projects / ust.git / blobdiff