From 783d57af7bb2b851c16cf87df848e0365e5052da Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 12 Apr 2017 13:58:40 +0200 Subject: Sort some miscutils/ applets into coreutils or util-linux No code changes Signed-off-by: Denys Vlasenko --- util-linux/chrt.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 util-linux/chrt.c (limited to 'util-linux/chrt.c') diff --git a/util-linux/chrt.c b/util-linux/chrt.c new file mode 100644 index 0000000..1604a68 --- /dev/null +++ b/util-linux/chrt.c @@ -0,0 +1,149 @@ +/* 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 +#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_str; + pid_str = *argv; + } + /* else "-p ", 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 ", + * or it was "-p " 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 [...]" */ + goto print_rt_info; + + BB_EXECVP_or_die(argv); +} -- cgit v1.1