#define _GNU_SOURCE
#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/shm.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
+#include <getopt.h>
#include "ustd.h"
#include "localerr.h"
#define PUT_SUBBUF_DIED 0
#define PUT_SUBBUF_PUSHED 2
+char *sock_path=NULL;
+char *trace_path=NULL;
+
+/* Number of active buffers and the mutex to protect it. */
+int active_buffers = 0;
+pthread_mutex_t active_buffers_mutex = PTHREAD_MUTEX_INITIALIZER;
+/* Whether a request to end the program was received. */
+sig_atomic_t terminate_req = 0;
+
int test_sigpipe(void)
{
sigset_t sigset;
return bufc-(const char *)buf;
}
+void decrement_active_buffers(void *arg)
+{
+ pthread_mutex_lock(&active_buffers_mutex);
+ active_buffers--;
+ pthread_mutex_unlock(&active_buffers_mutex);
+}
+
void *consumer_thread(void *arg)
{
struct buffer_info *buf = (struct buffer_info *) arg;
int result;
+ pthread_cleanup_push(decrement_active_buffers, NULL);
+
for(;;) {
/* get the subbuffer */
result = get_subbuffer(buf);
/* FIXME: destroy, unalloc... */
+ pthread_cleanup_pop(1);
+
return NULL;
}
return 0;
}
+int is_directory(const char *dir)
+{
+ int result;
+ struct stat st;
+
+ result = stat(dir, &st);
+ if(result == -1) {
+ PERROR("stat");
+ return 0;
+ }
+
+ if(!S_ISDIR(st.st_mode)) {
+ return 0;
+ }
+
+ return 1;
+}
+
int add_buffer(pid_t pid, char *bufname)
{
struct buffer_info *buf;
buf->memlen = shmds.shm_segsz;
/* open file for output */
- result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH);
- if(result == -1) {
- ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH);
- return -1;
+ if(!trace_path) {
+ /* Only create the directory if using the default path, because
+ * of the risk of typo when using trace path override. We don't
+ * want to risk creating plenty of useless directories in that case.
+ */
+ result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH);
+ if(result == -1) {
+ ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH);
+ return -1;
+ }
+
+ trace_path = USTD_DEFAULT_TRACE_PATH;
}
- asprintf(&tmp, "%s/%u", USTD_DEFAULT_TRACE_PATH, buf->pid);
+ asprintf(&tmp, "%s/%u", trace_path, buf->pid);
result = create_dir_if_needed(tmp);
if(result == -1) {
ERR("could not create directory %s", tmp);
}
free(tmp);
- asprintf(&tmp, "%s/%u/%s_0", USTD_DEFAULT_TRACE_PATH, buf->pid, buf->name);
+ asprintf(&tmp, "%s/%u/%s_0", trace_path, buf->pid, buf->name);
result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600);
if(result == -1) {
PERROR("open");
buf->file_fd = fd;
free(tmp);
+ pthread_mutex_lock(&active_buffers_mutex);
+ active_buffers++;
+ pthread_mutex_unlock(&active_buffers_mutex);
+
pthread_create(&thr, NULL, consumer_thread, buf);
return 0;
}
+void usage(void)
+{
+ fprintf(stderr, "Usage:\nustd OPTIONS\n\nOptions:\n"
+ "\t-h\t\tDisplay this usage.\n"
+ "\t-o DIR\t\tSpecify the directory where to output the traces.\n"
+ "\t-s PATH\t\tSpecify the path to use for the daemon socket.\n");
+}
+
+int parse_args(int argc, char **argv)
+{
+ int c;
+
+ while (1) {
+ int option_index = 0;
+ static struct option long_options[] = {
+ {"help", 0, 0, 'h'},
+ {"version", 0, 0, 'V'},
+ {0, 0, 0, 0}
+ };
+
+ c = getopt_long(argc, argv, "hs:o:", long_options, &option_index);
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 0:
+ printf("option %s", long_options[option_index].name);
+ if (optarg)
+ printf(" with arg %s", optarg);
+ printf("\n");
+ break;
+ case 's':
+ sock_path = optarg;
+ break;
+ case 'o':
+ trace_path = optarg;
+ if(!is_directory(trace_path)) {
+ ERR("Not a valid directory. (%s)", trace_path);
+ return -1;
+ }
+ break;
+ case 'h':
+ usage();
+ exit(0);
+ case 'V':
+ printf("Version 0.0\n");
+ break;
+
+ default:
+ /* unknown option or other error; error is
+ printed by getopt, just return */
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+void sigterm_handler(int sig)
+{
+ terminate_req = 1;
+}
+
int main(int argc, char **argv)
{
struct ustcomm_ustd ustd;
int result;
sigset_t sigset;
+ struct sigaction sa;
- result = ustcomm_init_ustd(&ustd);
+ result = sigemptyset(&sigset);
+ if(result == -1) {
+ perror("sigemptyset");
+ return 1;
+ }
+ sa.sa_handler = sigterm_handler;
+ sa.sa_mask = sigset;
+ sa.sa_flags = SA_RESTART;
+ result = sigaction(SIGTERM, &sa, NULL);
+ if(result == -1) {
+ PERROR("sigaction");
+ return 1;
+ }
+
+ result = parse_args(argc, argv);
+ if(result == -1) {
+ exit(1);
+ }
+
+ result = ustcomm_init_ustd(&ustd, sock_path);
if(result == -1) {
ERR("failed to initialize socket");
return 1;
}
+ /* setup handler for SIGPIPE */
result = sigemptyset(&sigset);
if(result == -1) {
perror("sigemptyset");
free(recvbuf);
}
+
+ if(terminate_req) {
+ pthread_mutex_lock(&active_buffers_mutex);
+ if(active_buffers == 0) {
+ pthread_mutex_unlock(&active_buffers_mutex);
+ break;
+ }
+ pthread_mutex_unlock(&active_buffers_mutex);
+ }
}
return 0;
projects / ust.git / blobdiff