e65b56003
Michele Dionisio via busybox
2026-10-04
Subject
chrt: add -R to set SCHED_RESET_ON_FORK
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Commit Diff GitHub →
util-linux/chrt.c+9 -4
| @@ -17,7 +17,7 @@ | |
| //kbuild:lib-$(CONFIG_CHRT) += chrt.o | |
| //usage:#define chrt_trivial_usage | |
| - | //usage: "-m | [-rfobi] { -p [PRIO] PID | PRIO PROG ARGS }" |
| + | //usage: "-m | [-rfobiR] { -p [PRIO] PID | PRIO PROG ARGS }" |
| //usage:#define chrt_full_usage "\n\n" | |
| //usage: "Change scheduling priority and class (default RR) for a process\n" | |
| //usage: "\n -m Show min/max priorities" | |
| @@ -27,6 +27,7 @@ | |
| //usage: "\n -o Set SCHED_OTHER class" | |
| //usage: "\n -b Set SCHED_BATCH class" | |
| //usage: "\n -i Set SCHED_IDLE class" | |
| + | //usage: "\n -R Set SCHED_RESET_ON_FORK" |
| //usage: | |
| //usage:#define chrt_example_usage | |
| //usage: "$ chrt -r 4 sleep 900; x=$!\n" | |
| @@ -38,6 +39,9 @@ | |
| #ifndef SCHED_IDLE | |
| # define SCHED_IDLE 5 | |
| #endif | |
| + | #ifndef SCHED_RESET_ON_FORK |
| + | # define SCHED_RESET_ON_FORK 0x40000000 |
| + | #endif |
| //musl has no __MUSL__ or similar define to check for, | |
| //but its <sys/types.h> has these lines: | |
| @@ -85,6 +89,7 @@ static void show_min_max(int pol) | |
| #define OPT_o (1<<4) | |
| #define OPT_b (1<<5) | |
| #define OPT_i (1<<6) | |
| + | #define OPT_R (1<<7) |
| int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | |
| int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| @@ -99,7 +104,7 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| int ret; | |
| opt = getopt32(argv, "^" | |
| - | "+" "mprfobi" |
| + | "+" "mprfobiR" |
| "\0" | |
| /* only one policy accepted: */ | |
| "r--fobi:f--robi:o--rfbi:b--rfoi:i--rfob" | |
| @@ -162,7 +167,6 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| #endif | |
| if (pol < 0) | |
| bb_perror_msg_and_die("can't %cet pid %u's policy", 'g', (int)pid); | |
| - | #ifdef SCHED_RESET_ON_FORK |
| /* "Since Linux 2.6.32, the SCHED_RESET_ON_FORK flag | |
| * can be ORed in policy when calling sched_setscheduler(). | |
| * As a result of including this flag, children created by | |
| @@ -172,7 +176,6 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| * (TODO: do we want to show it?) | |
| */ | |
| pol &= ~SCHED_RESET_ON_FORK; | |
| - | #endif |
| printf("pid %u's %s scheduling policy: SCHED_%s\n", | |
| pid, current_new, policy_name(pol) | |
| ); | |
| @@ -199,6 +202,8 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| sp.sched_priority = xstrtou_range(priority, 0, | |
| sched_get_priority_min(policy), sched_get_priority_max(policy) | |
| ); | |
| + | if (opt & OPT_R) |
| + | policy |= SCHED_RESET_ON_FORK; |
| #if LIBC_IS_MUSL | |
| ret = syscall(SYS_sched_setscheduler, pid, policy, &sp); | |