//config: bool "chrt (4.4 kb)"
//config: default y
//config: help
-//config: manipulate real-time attributes of a process.
+//config: Manipulate real-time attributes of a process.
//config: This requires sched_{g,s}etparam support in your libc.
//applet:IF_CHRT(APPLET_NOEXEC(chrt, chrt, BB_DIR_USR_BIN, BB_SUID_DROP, chrt))
//kbuild:lib-$(CONFIG_CHRT) += chrt.o
//usage:#define chrt_trivial_usage
-//usage: "[-prfom] [PRIO] [PID | PROG ARGS]"
+//usage: "[-prfombi] [PRIO] [PID | PROG ARGS]"
//usage:#define chrt_full_usage "\n\n"
//usage: "Change scheduling priority and class for a process\n"
//usage: "\n -p Operate on PID"
//usage: "\n -r Set SCHED_RR class"
//usage: "\n -f Set SCHED_FIFO class"
//usage: "\n -o Set SCHED_OTHER class"
+//usage: "\n -b Set SCHED_BATCH class"
+//usage: "\n -i Set SCHED_IDLE class"
//usage: "\n -m Show min/max priorities"
//usage:
//usage:#define chrt_example_usage
#include <sched.h>
#include "libbb.h"
+#ifndef SCHED_IDLE
+# define SCHED_IDLE 5
+#endif
static const struct {
- int policy;
char name[sizeof("SCHED_OTHER")];
} policies[] = {
- {SCHED_OTHER, "SCHED_OTHER"},
- {SCHED_FIFO, "SCHED_FIFO"},
- {SCHED_RR, "SCHED_RR"}
+ { "SCHED_OTHER" }, /* 0:SCHED_OTHER */
+ { "SCHED_FIFO" }, /* 1:SCHED_FIFO */
+ { "SCHED_RR" }, /* 2:SCHED_RR */
+ { "SCHED_BATCH" }, /* 3:SCHED_BATCH */
+ { "" }, /* 4:SCHED_ISO */
+ { "SCHED_IDLE" }, /* 5:SCHED_IDLE */
+ /* 6:SCHED_DEADLINE */
};
-//TODO: add
-// -b, SCHED_BATCH
-// -i, SCHED_IDLE
-
static void show_min_max(int pol)
{
const char *fmt = "%s min/max priority\t: %u/%u\n";
#define OPT_r (1<<2)
#define OPT_f (1<<3)
#define OPT_o (1<<4)
+#define OPT_b (1<<5)
+#define OPT_i (1<<6)
int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chrt_main(int argc UNUSED_PARAM, char **argv)
const char *current_new;
int policy = SCHED_RR;
- /* only one policy accepted */
- opt_complementary = "r--fo:f--ro:o--rf";
- opt = getopt32(argv, "+mprfo");
+ opt = getopt32(argv, "^"
+ "+" "mprfobi"
+ "\0"
+ /* only one policy accepted: */
+ "r--fobi:f--robi:o--rfbi:b--rfoi:i--rfob"
+ );
if (opt & OPT_m) { /* print min/max and exit */
+ show_min_max(SCHED_OTHER);
show_min_max(SCHED_FIFO);
show_min_max(SCHED_RR);
- show_min_max(SCHED_OTHER);
+ show_min_max(SCHED_BATCH);
+ show_min_max(SCHED_IDLE);
fflush_stdout_and_exit(EXIT_SUCCESS);
}
- if (opt & OPT_r)
- policy = SCHED_RR;
+ //if (opt & OPT_r)
+ // policy = SCHED_RR; - default, already set
if (opt & OPT_f)
policy = SCHED_FIFO;
if (opt & OPT_o)
policy = SCHED_OTHER;
+ if (opt & OPT_b)
+ policy = SCHED_BATCH;
+ if (opt & OPT_i)
+ policy = SCHED_IDLE;
argv += optind;
if (!argv[0])
current_new += 8;
}
- /* 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 static priority 0.
- [...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
- */
- sp.sched_priority = xstrtou_range(priority, 0, policy != SCHED_OTHER ? 1 : 0, 99);
+ sp.sched_priority = xstrtou_range(priority, 0,
+ sched_get_priority_min(policy), sched_get_priority_max(policy)
+ );
if (sched_setscheduler(pid, policy, &sp) < 0)
bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid);