#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <OS.h>
static int usage(char *prog)
{
printf("usage: release [-f] [-c count] semaphore_number\n");
printf("warning: this can be hazardous...\n");
exit(1);
}
int main(int argc, char **argv)
{
int count = 1;
bool force = false;
sem_id semid = -1;
status_t err;
team_id teamid = -1;
int i;
if (argc < 2 || argc > 5)
usage("release");
for (i = 1; i < argc; i++) {
if (strncmp(argv[i], "-f", 2) == 0) {
force = true;
} else if (strncmp(argv[i], "-c", 2) == 0) {
i++;
if (i < argc) {
count = strtol(argv[i], NULL, 10);
} else
usage("release");
} else {
semid = strtol(argv[i], NULL, 10);
}
}
if (semid <=0)
usage("release");
if (force) {
sem_info sinfo;
thread_info tinfo;
get_sem_info(semid, &sinfo);
teamid = sinfo.team;
get_thread_info(find_thread(NULL), &tinfo);
set_sem_owner(semid, tinfo.team);
}
printf("releasing semaphore %d\n", (int)semid);
err = release_sem_etc(semid, count, 0);
if (err < B_OK) {
fprintf(stderr, "release_sem failed: %s\n", strerror(err));
return 1;
} else if (force) {
set_sem_owner(semid, teamid);
}
return 0;
}
