mirror of
https://github.com/sheumann/hush.git
synced 2024-12-28 22:30:05 +00:00
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* chrt - manipulate real-time attributes of a process
|
|
* Copyright (c) 2006-2007 Bernhard Fischer
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include "busybox.h"
|
|
#include <unistd.h>
|
|
#include <sched.h>
|
|
#include <getopt.h> /* optind */
|
|
#ifndef _POSIX_PRIORITY_SCHEDULING
|
|
#warning your system may be foobared
|
|
#endif
|
|
static const struct {
|
|
const int policy;
|
|
const char const name[12];
|
|
} policies[] = {
|
|
{SCHED_OTHER, "SCHED_OTHER"},
|
|
{SCHED_FIFO, "SCHED_FIFO"},
|
|
{SCHED_RR, "SCHED_RR"}
|
|
};
|
|
|
|
static void show_min_max(int pol)
|
|
{
|
|
const char *fmt = "%s min/max priority\t: %d/%d\n\0%s not supported?\n";
|
|
int max, min;
|
|
max = sched_get_priority_max(pol);
|
|
min = sched_get_priority_min(pol);
|
|
if (max >= 0 && min >= 0)
|
|
printf(fmt, policies[pol].name, min, max);
|
|
else {
|
|
fmt += 29;
|
|
printf(fmt, policies[pol].name);
|
|
}
|
|
}
|
|
|
|
#define OPT_m (1<<0)
|
|
#define OPT_p (1<<1)
|
|
#define OPT_r (1<<2)
|
|
#define OPT_f (1<<3)
|
|
#define OPT_o (1<<4)
|
|
|
|
int chrt_main(int argc, char** argv);
|
|
int chrt_main(int argc, char** argv)
|
|
{
|
|
pid_t pid = 0;
|
|
unsigned opt;
|
|
struct sched_param sp;
|
|
char *p_opt = NULL, *priority = NULL;
|
|
const char *state = "current\0new";
|
|
int prio = 0, policy = SCHED_RR;
|
|
|
|
opt_complementary = "r--fo:f--ro:r--fo"; /* only one policy accepted */
|
|
opt = getopt32(argc, argv, "+mp:rfo", &p_opt);
|
|
if (opt & OPT_r)
|
|
policy = SCHED_RR;
|
|
if (opt & OPT_f)
|
|
policy = SCHED_FIFO;
|
|
if (opt & OPT_o)
|
|
policy = SCHED_OTHER;
|
|
|
|
if (opt & OPT_m) { /* print min/max */
|
|
show_min_max(SCHED_FIFO);
|
|
show_min_max(SCHED_RR);
|
|
show_min_max(SCHED_OTHER);
|
|
fflush_stdout_and_exit(EXIT_SUCCESS);
|
|
}
|
|
if (opt & OPT_p) {
|
|
if (argc == optind+1) { /* -p <priority> <pid> */
|
|
priority = p_opt;
|
|
p_opt = argv[optind];
|
|
}
|
|
argv += optind; /* me -p <arg> */
|
|
pid = xatoul_range(p_opt, 1, ULONG_MAX); /* -p <pid> */
|
|
} else {
|
|
argv += optind; /* me -p <arg> */
|
|
priority = *argv;
|
|
}
|
|
if (priority) {
|
|
/* from the manpage of sched_getscheduler:
|
|
[...] sched_priority can have a value
|
|
in the range 0 to 99.
|
|
[...] SCHED_OTHER or SCHED_BATCH must be assigned
|
|
the static priority 0. [...] SCHED_FIFO or
|
|
SCHED_RR can have a static priority in the range 1 to 99.
|
|
*/
|
|
prio = xstrtol_range(priority, 0, policy == SCHED_OTHER
|
|
? 0 : 1, 99);
|
|
}
|
|
|
|
if (opt & OPT_p) {
|
|
int pol = 0;
|
|
print_rt_info:
|
|
pol = sched_getscheduler(pid);
|
|
if (pol < 0)
|
|
bb_perror_msg_and_die("failed to %cet pid %d's policy", 'g', pid);
|
|
printf("pid %d's %s scheduling policy: %s\n",
|
|
pid, state, policies[pol].name);
|
|
if (sched_getparam(pid, &sp))
|
|
bb_perror_msg_and_die("failed to get pid %d's attributes", pid);
|
|
printf("pid %d's %s scheduling priority: %d\n",
|
|
pid, state, sp.sched_priority);
|
|
if (!*argv) /* no new prio given or we did print already, done. */
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
sp.sched_priority = prio;
|
|
if (sched_setscheduler(pid, policy, &sp) < 0)
|
|
bb_perror_msg_and_die("failed to %cet pid %d's policy", 's', pid);
|
|
if (opt & OPT_p) {
|
|
state += 8;
|
|
++argv;
|
|
goto print_rt_info;
|
|
}
|
|
++argv;
|
|
BB_EXECVP(*argv, argv);
|
|
bb_perror_msg_and_die("%s", *argv);
|
|
}
|
|
#undef OPT_p
|
|
#undef OPT_r
|
|
#undef OPT_f
|
|
#undef OPT_o
|
|
#undef OPT_m
|