int main(int argc, char **argv)
{
int i, policy = SCHED_RR, priority = 0, verbose = 0, policy_flag = 0,
all_tasks = 0;
struct sched_param sp;
pid_t pid = -1;
static const struct option longopts[] = {
{ "all-tasks", 0, NULL, 'a' },
{ "batch", 0, NULL, 'b' },
{ "fifo", 0, NULL, 'f' },
{ "idle", 0, NULL, 'i' },
{ "pid", 0, NULL, 'p' },
{ "help", 0, NULL, 'h' },
{ "max", 0, NULL, 'm' },
{ "other", 0, NULL, 'o' },
{ "rr", 0, NULL, 'r' },
{ "reset-on-fork", 0, NULL, 'R' },
{ "verbose", 0, NULL, 'v' },
{ "version", 0, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
while((i = getopt_long(argc, argv, "+abfiphmoRrvV", longopts, NULL)) != -1)
{
int ret = EXIT_FAILURE;
switch (i) {
case 'a':
all_tasks = 1;
break;
case 'b':
#ifdef SCHED_BATCH
policy = SCHED_BATCH;
#endif
break;
case 'f':
policy = SCHED_FIFO;
break;
case 'R':
#ifdef SCHED_RESET_ON_FORK
policy_flag |= SCHED_RESET_ON_FORK;
#endif
break;
case 'i':
#ifdef SCHED_IDLE
policy = SCHED_IDLE;
#endif
break;
case 'm':
show_min_max();
return EXIT_SUCCESS;
case 'o':
policy = SCHED_OTHER;
break;
case 'p':
errno = 0;
pid = strtol_or_err(argv[argc - 1], _("failed to parse pid"));
break;
case 'r':
policy = SCHED_RR;
break;
case 'v':
verbose = 1;
break;
case 'V':
printf("%s from %s\n", program_invocation_short_name,
PACKAGE_STRING);
return EXIT_SUCCESS;
case 'h':
ret = EXIT_SUCCESS;
/* fallthrough */
default:
show_usage(ret);
}
}
if (((pid > -1) && argc - optind < 1) ||
((pid == -1) && argc - optind < 2))
show_usage(EXIT_FAILURE);
if ((pid > -1) && (verbose || argc - optind == 1)) {
if (all_tasks) {
pid_t tid;
struct proc_tasks *ts = proc_open_tasks(pid);
if (!ts)
err(EXIT_FAILURE, _("cannot obtain the list of tasks"));
while (!proc_next_tid(ts, &tid))
show_rt_info(tid, FALSE);
proc_close_tasks(ts);
} else
show_rt_info(pid, FALSE);
if (argc - optind == 1)
return EXIT_SUCCESS;
}
errno = 0;
priority = strtol_or_err(argv[optind], _("failed to parse priority"));
#ifdef SCHED_RESET_ON_FORK
/* sanity check */
if ((policy_flag & SCHED_RESET_ON_FORK) &&
!(policy == SCHED_FIFO || policy == SCHED_RR))
errx(EXIT_FAILURE, _("SCHED_RESET_ON_FORK flag is suppoted for "
"SCHED_FIFO and SCHED_RR policies only"));
#endif
policy |= policy_flag;
if (pid == -1)
pid = 0;
sp.sched_priority = priority;
if (all_tasks) {
pid_t tid;
struct proc_tasks *ts = proc_open_tasks(pid);
if (!ts)
err(EXIT_FAILURE, _("cannot obtain the list of tasks"));
while (!proc_next_tid(ts, &tid))
if (sched_setscheduler(tid, policy, &sp) == -1)
err(EXIT_FAILURE, _("failed to set tid %d's policy"), tid);
proc_close_tasks(ts);
} else if (sched_setscheduler(pid, policy, &sp) == -1)
err(EXIT_FAILURE, _("failed to set pid %d's policy"), pid);
if (verbose)
show_rt_info(pid, TRUE);
if (!pid) {
argv += optind + 1;
execvp(argv[0], argv);
perror("execvp");
err(EXIT_FAILURE, _("failed to execute %s"), argv[0]);
}
return EXIT_SUCCESS;
}
int main(int argc, char *argv[])
{
int i, policy = SCHED_RR, priority = 0, verbose = 0;
struct sched_param sp;
pid_t pid = 0;
struct option longopts[] = {
{ "fifo", 0, NULL, 'f' },
{ "pid", 0, NULL, 'p' },
{ "help", 0, NULL, 'h' },
{ "max", 0, NULL, 'm' },
{ "other", 0, NULL, 'o' },
{ "rr", 0, NULL, 'r' },
{ "verbose", 0, NULL, 'v' },
{ "version", 0, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
while((i = getopt_long(argc, argv, "+fphmorvV", longopts, NULL)) != -1)
{
int ret = 1;
switch (i) {
case 'f':
policy = SCHED_FIFO;
break;
case 'm':
show_min_max();
return 0;
case 'o':
policy = SCHED_OTHER;
break;
case 'p':
errno = 0;
pid = strtol(argv[argc - 1], NULL, 10);
if (errno) {
perror("strtol");
fprintf(stderr, "failed to parse pid!\n");
return 1;
}
break;
case 'r':
policy = SCHED_RR;
break;
case 'v':
verbose = 1;
break;
case 'V':
printf("chrt (%s)\n", PACKAGE_STRING);
return 0;
case 'h':
ret = 0;
default:
show_usage(argv[0]);
return ret;
}
}
if ((pid && argc - optind < 1) || (!pid && argc - optind < 2)) {
show_usage(argv[0]);
return 1;
}
if (pid && (verbose || argc - optind == 1)) {
show_rt_info("current", pid);
if (argc - optind == 1)
return 0;
}
errno = 0;
priority = strtol(argv[optind], NULL, 10);
if (errno) {
perror("strtol");
fprintf(stderr, "failed to parse priority!\n");
return 1;
}
sp.sched_priority = priority;
if (sched_setscheduler(pid, policy, &sp) == -1) {
perror("sched_setscheduler");
fprintf(stderr, "failed to set pid %d's policy\n", pid);
return 1;
}
if (verbose)
show_rt_info("new", pid);
if (!pid) {
argv += optind + 1;
execvp(argv[0], argv);
perror("execvp");
fprintf(stderr, "failed to execute %s\n", argv[0]);
return 1;
}
return 0;
}
