//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))
#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_BATCH, "SCHED_BATCH"},
- {0 /* unused */, ""},
- {SCHED_IDLE, "SCHED_IDLE"}
+ { "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 */
};
static void show_min_max(int pol)
const char *current_new;
int policy = SCHED_RR;
- /* only one policy accepted */
- opt = getopt32(argv, "^+" "mprfobi" "\0" "r--fobi:f--robi:o--rfbi:b--rfoi:i--rfob");
+ 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)
current_new += 8;
}
- /* from the manpage of sched_getscheduler:
- [...] sched_priority can have a value in the range 0 to 99.
- [...] SCHED_OTHER, SCHED_BATCH or SCHED_IDLE 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 && policy != SCHED_BATCH && policy != SCHED_IDLE) ? 1 : 0, 99);
+ 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);