* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _REENTRANT
#define _GNU_SOURCE
+#include <features.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/poll.h>
#include <sys/mman.h>
#include <signal.h>
+#include <pthread.h>
/* Relayfs IOCTL */
#include <asm/ioctl.h>
/* Get the next sub buffer that can be read. */
#define RELAYFS_GET_SUBBUF _IOR(0xF4, 0x00,__u32)
/* Release the oldest reserved (by "get") sub buffer. */
-#define RELAYFS_PUT_SUBBUF _IO(0xF4, 0x01)
+#define RELAYFS_PUT_SUBBUF _IOW(0xF4, 0x01,__u32)
/* returns the number of sub buffers in the per cpu channel. */
#define RELAYFS_GET_N_SUBBUFS _IOR(0xF4, 0x02,__u32)
/* returns the size of the sub buffers. */
static char *channel_name = NULL;
static int daemon_mode = 0;
static int append_mode = 0;
+static unsigned long num_threads = 1;
volatile static int quit_program = 0; /* For signal handler */
/* Args :
* -c directory Root directory of the relayfs trace channels.
* -d Run in background (daemon).
* -a Trace append mode.
+ * -s Send SIGUSR1 to parent when ready for IO.
*/
void show_arguments(void)
{
printf("-c directory Root directory of the relayfs trace channels.\n");
printf("-d Run in background (daemon).\n");
printf("-a Append to an possibly existing trace.\n");
+ printf("-n Number of threads to start.\n");
printf("\n");
}
case 'a':
append_mode = 1;
break;
+ case 'n':
+ if(argn+1 < argc) {
+ num_threads = strtoul(argv[argn+1], NULL, 0);
+ argn++;
+ }
+ break;
default:
printf("Invalid argument '%s'.\n", argv[argn]);
printf("\n");
char path_trace[PATH_MAX];
int path_trace_len;
char *path_trace_ptr;
+ int open_ret = 0;
if(channel_dir == NULL) {
perror(subchannel_name);
- return ENOENT;
+ open_ret = ENOENT;
+ goto end;
}
- //FIXME : check if the directory already exist, and ask the user if he wants
- //to append to the traces.
printf("Creating trace subdirectory %s\n", subtrace_name);
ret = mkdir(subtrace_name, S_IRWXU|S_IRWXG|S_IRWXO);
if(ret == -1) {
- if(errno == EEXIST && append_mode) {
- printf("Appending to directory %s as resquested\n", subtrace_name);
- } else {
+ if(errno != EEXIST) {
perror(subtrace_name);
- return -1;
+ open_ret = -1;
+ goto end;
}
}
open(path_channel, O_RDONLY | O_NONBLOCK);
if(fd_pairs->pair[fd_pairs->num_pairs-1].channel == -1) {
perror(path_channel);
+ fd_pairs->num_pairs--;
+ continue;
}
/* Open the trace in write mode, only append if append_mode */
ret = stat(path_trace, &stat_buf);
if(ret == 0) {
if(append_mode) {
- printf("Appending to file %s as resquested\n", path_trace);
+ printf("Appending to file %s as requested\n", path_trace);
fd_pairs->pair[fd_pairs->num_pairs-1].trace =
open(path_trace, O_WRONLY|O_APPEND,
}
} else {
printf("File %s exists, cannot open. Try append mode.\n", path_trace);
- return -1;
+ open_ret = -1;
+ goto end;
}
} else {
if(errno == ENOENT) {
}
}
+end:
closedir(channel_dir);
- return 0;
+ return open_ret;
}
int read_subbuffer(struct fd_pair *pair)
{
- unsigned int subbuf_index;
- int ret;
+ unsigned int consumed_old;
+ int err, ret;
- ret = ioctl(pair->channel, RELAYFS_GET_SUBBUF,
- &subbuf_index);
- if(ret != 0) {
+ err = ioctl(pair->channel, RELAYFS_GET_SUBBUF,
+ &consumed_old);
+ printf("cookie : %u\n", consumed_old);
+ if(err != 0) {
perror("Error in reserving sub buffer");
- goto error;
+ ret = -EPERM;
+ goto get_error;
}
-
- ret = TEMP_FAILURE_RETRY(write(pair->trace,
- pair->mmap + (subbuf_index * pair->subbuf_size),
- pair->subbuf_size));
- if(ret != 0) {
+ err = TEMP_FAILURE_RETRY(write(pair->trace,
+ pair->mmap
+ + (consumed_old & ((pair->n_subbufs * pair->subbuf_size)-1)),
+ pair->subbuf_size));
+
+ if(err < 0) {
perror("Error in writing to file");
- goto error;
+ ret = err;
+ goto write_error;
}
- ret = ioctl(pair->channel, RELAYFS_PUT_SUBBUF);
- if(ret != 0) {
- perror("Error in unreserving sub buffer");
- goto error;
+write_error:
+ err = ioctl(pair->channel, RELAYFS_PUT_SUBBUF, &consumed_old);
+ if(err != 0) {
+ if(errno == -EFAULT) {
+ perror("Error in unreserving sub buffer");
+ ret = -EFAULT;
+ } else if(errno == -EIO) {
+ perror("Reader has been pushed by the writer, last subbuffer corrupted.");
+ /* FIXME : we may delete the last written buffer if we wish. */
+ ret = -EIO;
+ }
+ goto get_error;
}
- return 0;
-error:
- return -1;
+get_error:
+ return ret;
}
-/* read_channels
- *
- * Read the realyfs channels and write them in the paired tracefiles.
- *
- * @fd_pairs : paired channels and trace files.
- *
- * returns 0 on success, -1 on error.
- *
- * Note that the high priority polled channels are consumed first. We then poll
- * again to see if these channels are still in priority. Only when no
- * high priority channel is left, we start reading low priority channels.
- *
- * Note that a channel is considered high priority when the buffer is almost
- * full.
- */
-int read_channels(struct channel_trace_fd *fd_pairs)
+int map_channels(struct channel_trace_fd *fd_pairs)
{
- struct pollfd *pollfd;
int i,j;
- int num_rdy, num_hup;
- int high_prio;
- int ret;
+ int ret=0;
+ if(fd_pairs->num_pairs <= 0) {
+ printf("No channel to read\n");
+ goto end;
+ }
+
/* Get the subbuf sizes and number */
for(i=0;i<fd_pairs->num_pairs;i++) {
}
+ /* Error handling */
+ /* munmap only the successfully mmapped indexes */
+munmap:
+ /* Munmap each FD */
+ for(j=0;j<i;j++) {
+ struct fd_pair *pair = &fd_pairs->pair[j];
+ int err_ret;
+
+ err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs);
+ if(err_ret != 0) {
+ perror("Error in munmap");
+ }
+ ret |= err_ret;
+ }
+
+end:
+ return ret;
+
+
+}
+
+
+int unmap_channels(struct channel_trace_fd *fd_pairs)
+{
+ int j;
+ int ret=0;
+
+ /* Munmap each FD */
+ for(j=0;j<fd_pairs->num_pairs;j++) {
+ struct fd_pair *pair = &fd_pairs->pair[j];
+ int err_ret;
+
+ err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs);
+ if(err_ret != 0) {
+ perror("Error in munmap");
+ }
+ ret |= err_ret;
+ }
+
+ return ret;
+}
+
+
+/* read_channels
+ *
+ * Read the relayfs channels and write them in the paired tracefiles.
+ *
+ * @fd_pairs : paired channels and trace files.
+ *
+ * returns 0 on success, -1 on error.
+ *
+ * Note that the high priority polled channels are consumed first. We then poll
+ * again to see if these channels are still in priority. Only when no
+ * high priority channel is left, we start reading low priority channels.
+ *
+ * Note that a channel is considered high priority when the buffer is almost
+ * full.
+ */
+
+int read_channels(struct channel_trace_fd *fd_pairs)
+{
+ struct pollfd *pollfd;
+ int i,j;
+ int num_rdy, num_hup;
+ int high_prio;
+ int ret;
+
/* Start polling the FD */
pollfd = malloc(fd_pairs->num_pairs * sizeof(struct pollfd));
printf("Press a key for next poll...\n");
char buf[1];
read(STDIN_FILENO, &buf, 1);
- printf("Next poll :\n");
+ printf("Next poll (polling %d fd) :\n", fd_pairs->num_pairs);
#endif //DEBUG
/* Have we received a signal ? */
free_fd:
free(pollfd);
- /* munmap only the successfully mmapped indexes */
- i = fd_pairs->num_pairs;
-munmap:
- /* Munmap each FD */
- for(j=0;j<i;j++) {
- struct fd_pair *pair = &fd_pairs->pair[j];
- int err_ret;
-
- err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs);
- if(err_ret != 0) {
- perror("Error in munmap");
- }
- ret |= err_ret;
- }
-
end:
return ret;
}
int main(int argc, char ** argv)
{
- int ret;
- pid_t pid;
+ int ret = 0;
struct channel_trace_fd fd_pairs = { NULL, 0 };
struct sigaction act;
show_info();
if(daemon_mode) {
- pid = fork();
-
- if(pid > 0) {
- /* parent */
- return 0;
- } else if(pid < 0) {
- /* error */
- printf("An error occured while forking.\n");
- return -1;
- }
- /* else, we are the child, continue... */
- }
+ ret = daemon(0, 0);
+
+ if(ret == -1) {
+ perror("An error occured while daemonizing.");
+ exit(-1);
+ }
+ }
/* Connect the signal handlers */
act.sa_handler = handler;
sigaction(SIGQUIT, &act, NULL);
sigaction(SIGINT, &act, NULL);
- //return 0;
+
if(ret = open_channel_trace_pairs(channel_name, trace_name, &fd_pairs))
goto close_channel;
+ if(ret = map_channels(&fd_pairs))
+ goto close_channel;
+
ret = read_channels(&fd_pairs);
+ ret |= unmap_channels(&fd_pairs);
+
close_channel:
close_channel_trace_pairs(&fd_pairs);
projects / ltt-control.git / blobdiff