int
main(int argc, char *argv[])
{
bus_t bus;
int i;
if (argc < 2)
return fprintf(stderr, "USAGE: %s daemon...", *argv), 2;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_WRONLY));
for (i = 1; i < argc; i++) {
sprintf(arg, "grep '^%s$' < \"${XDG_RUNTIME_DIR}/started-daemons\" >/dev/null", argv[i]);
if (WEXITSTATUS(system(arg))) {
sprintf(arg, "%ji require %s", (intmax_t)getppid(), argv[i]);
t(bus_write(&bus, arg, 0));
}
}
bus_close(&bus);
return 0;
fail:
perror("require");
bus_close(&bus);
return 1;
}
/**
* Change the permissions for a bus
*
* `stat(2)` can be used of the bus's associated file to get the bus's permissions
*
* @param file The pathname of the bus
* @param mode The permissions of the bus, any permission for a user implies
* full permissions for that user, except only the owner may
* edit the bus's associated file
* @return 0 on success, -1 on error
*/
int
bus_chmod(const char *file, mode_t mode)
{
bus_t bus;
mode_t fmode;
struct semid_ds sem_stat;
struct shmid_ds shm_stat;
int shm_id;
mode = (mode & S_IRWXU) ? (mode | S_IRWXU) : (mode & ~S_IRWXU);
mode = (mode & S_IRWXG) ? (mode | S_IRWXG) : (mode & ~S_IRWXG);
mode = (mode & S_IRWXO) ? (mode | S_IRWXO) : (mode & ~S_IRWXO);
mode &= (S_IWUSR | S_IWGRP | S_IWOTH | S_IRUSR | S_IRGRP | S_IROTH);
fmode = mode & ~(S_IWGRP | S_IWOTH);
t(bus_open(&bus, file, -1));
t(chmod(file, fmode));
/* chmod sem */
t(open_semaphores(&bus));
t(semctl(bus.sem_id, 0, IPC_STAT, &sem_stat));
sem_stat.sem_perm.mode = mode;
t(semctl(bus.sem_id, 0, IPC_SET, &sem_stat));
/* chmod shm */
t(shm_id = shmget(bus.key_shm, (size_t)BUS_MEMORY_SIZE, 0));
t(shmctl(shm_id, IPC_STAT, &shm_stat));
shm_stat.shm_perm.mode = mode;
t(shmctl(shm_id, IPC_SET, &shm_stat));
return 0;
fail:
return -1;
}
/**
* Change the ownership of a bus
*
* `stat(2)` can be used of the bus's associated file to get the bus's ownership
*
* @param file The pathname of the bus
* @param owner The user ID of the bus's new owner
* @param group The group ID of the bus's new group
* @return 0 on success, -1 on error
*/
int
bus_chown(const char *file, uid_t owner, gid_t group)
{
bus_t bus;
struct semid_ds sem_stat;
struct shmid_ds shm_stat;
int shm_id;
t(bus_open(&bus, file, -1));
t(chown(file, owner, group));
/* chown sem */
t(open_semaphores(&bus));
t(semctl(bus.sem_id, 0, IPC_STAT, &sem_stat));
sem_stat.sem_perm.uid = owner;
sem_stat.sem_perm.gid = group;
t(semctl(bus.sem_id, 0, IPC_SET, &sem_stat));
/* chown shm */
t(shm_id = shmget(bus.key_shm, (size_t)BUS_MEMORY_SIZE, 0));
t(shmctl(shm_id, IPC_STAT, &shm_stat));
shm_stat.shm_perm.uid = owner;
shm_stat.shm_perm.gid = group;
t(shmctl(shm_id, IPC_SET, &shm_stat));
return 0;
fail:
return -1;
}
int main(int argc, char *argv[])
{
bus_t bus;
if (argc < 3)
return fprintf(stderr, "USAGE: %s state daemon", *argv), 2;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_WRONLY));
sprintf(arg, "%ji %s %s", (intmax_t)getppid(), argv[1], argv[2]);
t(bus_write(&bus, arg));
t(bus_close(&bus));
return 0;
fail:
perror("announce");
return 1;
}
static void
announce_wait(pid_t pid)
{
bus_t bus;
int i;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_WRONLY));
for (i = 1; i < argc; i++) {
if (!started[i]) {
sprintf(arg, "%ji awaiting-started %s", (intmax_t)pid, argv[i]);
t(bus_write(&bus, arg, 0));
}
}
t(bus_close(&bus));
return;
fail:
perror("await-started");
}
int
main()
{
bus_t bus;
struct timespec timeout;
t(bus_open(&bus, "/tmp/example-bus", BUS_RDONLY));
t(clock_gettime(CLOCK_MONOTONIC, &timeout));
timeout.tv_sec += 10;
t(bus_read_timed(&bus, callback, NULL, &timeout, CLOCK_MONOTONIC));
bus_close(&bus);
return 0;
fail:
perror("poll");
bus_poll_stop(&bus);
bus_close(&bus);
return 1;
}
int
main(int argc_, char *argv_[])
{
bus_t bus;
int i;
argc = argc_;
argv = argv_;
if (argc < 2)
return fprintf(stderr, "USAGE: %s daemon...", *argv), 2;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_RDONLY));
started = calloc(argc, sizeof(char));
t(started == NULL);
started[0] = 1;
for (i = 1; i < argc; i++) {
sprintf(arg, "grep '^%s$' < \"${XDG_RUNTIME_DIR}/started-daemons\" >/dev/null", argv[i]);
if (!WEXITSTATUS(system(arg))) {
started[i] = 1;
} else {
sprintf(arg, "grep '^%s$' < \"${XDG_RUNTIME_DIR}/ready-daemons\" >/dev/null", argv[i]);
if (!WEXITSTATUS(system(arg)))
started[i] = 1;
else
remaining++;
}
}
if (remaining)
bus_read(&bus, callback, NULL);
bus_close(&bus);
free(started);
return 0;
fail:
perror("await-started");
bus_close(&bus);
free(started);
return 1;
}
/**
* Remove a bus
*
* @param file The pathname of the bus
* @return 0 on success, -1 on error
*/
int
bus_unlink(const char *file)
{
int r = 0, saved_errno = 0;
bus_t bus;
t(bus_open(&bus, file, -1));
r |= remove_semaphores(&bus);
if (r && !saved_errno)
saved_errno = errno;
r |= remove_shared_memory(&bus);
if (r && !saved_errno)
saved_errno = errno;
r |= unlink(file);
if (r && !saved_errno)
saved_errno = errno;
errno = saved_errno;
return r;
fail:
return -1;
}
