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Diffstat (limited to 'miscutils/chrt.c')
| -rw-r--r-- | miscutils/chrt.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/miscutils/chrt.c b/miscutils/chrt.c deleted file mode 100644 index 1604a68..0000000 --- a/miscutils/chrt.c +++ /dev/null @@ -1,149 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * chrt - manipulate real-time attributes of a process - * Copyright (c) 2006-2007 Bernhard Reutner-Fischer - * - * Licensed under GPLv2 or later, see file LICENSE in this source tree. - */ -//config:config CHRT -//config: bool "chrt" -//config: default y -//config: help -//config: manipulate real-time attributes of a process. -//config: This requires sched_{g,s}etparam support in your libc. - -//applet:IF_CHRT(APPLET(chrt, BB_DIR_USR_BIN, BB_SUID_DROP)) - -//kbuild:lib-$(CONFIG_CHRT) += chrt.o - -//usage:#define chrt_trivial_usage -//usage: "[-prfom] [PRIO] [PID | PROG ARGS]" -//usage:#define chrt_full_usage "\n\n" -//usage: "Change scheduling priority and class for a process\n" -//usage: "\n -p Operate on PID" -//usage: "\n -r Set SCHED_RR class" -//usage: "\n -f Set SCHED_FIFO class" -//usage: "\n -o Set SCHED_OTHER class" -//usage: "\n -m Show min/max priorities" -//usage: -//usage:#define chrt_example_usage -//usage: "$ chrt -r 4 sleep 900; x=$!\n" -//usage: "$ chrt -f -p 3 $x\n" -//usage: "You need CAP_SYS_NICE privileges to set scheduling attributes of a process" - -#include <sched.h> -#include "libbb.h" - -static const struct { - int policy; - char name[sizeof("SCHED_OTHER")]; -} policies[] = { - {SCHED_OTHER, "SCHED_OTHER"}, - {SCHED_FIFO, "SCHED_FIFO"}, - {SCHED_RR, "SCHED_RR"} -}; - -//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"; - int max, min; - - max = sched_get_priority_max(pol); - min = sched_get_priority_min(pol); - if ((max|min) < 0) - fmt = "%s not supported\n"; - printf(fmt, policies[pol].name, min, max); -} - -#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) MAIN_EXTERNALLY_VISIBLE; -int chrt_main(int argc UNUSED_PARAM, char **argv) -{ - pid_t pid = 0; - unsigned opt; - struct sched_param sp; - char *pid_str; - char *priority = priority; /* for compiler */ - const char *current_new; - int policy = SCHED_RR; - - /* only one policy accepted */ - opt_complementary = "r--fo:f--ro:o--rf"; - opt = getopt32(argv, "+mprfo"); - if (opt & OPT_m) { /* print min/max and exit */ - show_min_max(SCHED_FIFO); - show_min_max(SCHED_RR); - show_min_max(SCHED_OTHER); - fflush_stdout_and_exit(EXIT_SUCCESS); - } - if (opt & OPT_r) - policy = SCHED_RR; - if (opt & OPT_f) - policy = SCHED_FIFO; - if (opt & OPT_o) - policy = SCHED_OTHER; - - argv += optind; - if (!argv[0]) - bb_show_usage(); - if (opt & OPT_p) { - pid_str = *argv++; - if (*argv) { /* "-p <priority> <pid> [...]" */ - priority = pid_str; - pid_str = *argv; - } - /* else "-p <pid>", and *argv == NULL */ - pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1); - } else { - priority = *argv++; - if (!*argv) - bb_show_usage(); - } - - current_new = "current\0new"; - if (opt & OPT_p) { - int pol; - print_rt_info: - pol = sched_getscheduler(pid); - if (pol < 0) - bb_perror_msg_and_die("can't %cet pid %d's policy", 'g', (int)pid); - printf("pid %d's %s scheduling policy: %s\n", - pid, current_new, policies[pol].name); - if (sched_getparam(pid, &sp)) - bb_perror_msg_and_die("can't get pid %d's attributes", (int)pid); - printf("pid %d's %s scheduling priority: %d\n", - (int)pid, current_new, sp.sched_priority); - if (!*argv) { - /* Either it was just "-p <pid>", - * or it was "-p <priority> <pid>" and we came here - * for the second time (see goto below) */ - return EXIT_SUCCESS; - } - *argv = NULL; - 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); - - if (sched_setscheduler(pid, policy, &sp) < 0) - bb_perror_msg_and_die("can't %cet pid %d's policy", 's', (int)pid); - - if (!argv[0]) /* "-p <priority> <pid> [...]" */ - goto print_rt_info; - - BB_EXECVP_or_die(argv); -} |