3cc246095
Denys Vlasenko
2025-10-07
Subject
chrt: support passing `-p 0` to operate on self
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util-linux/chrt.c+10 -3
| @@ -17,9 +17,9 @@ | |
| //kbuild:lib-$(CONFIG_CHRT) += chrt.o | |
| //usage:#define chrt_trivial_usage | |
| - | //usage: "-m | -p [PRIO] PID | [-rfobi] PRIO PROG ARGS" |
| + | //usage: "-m | [-rfobi] { -p [PRIO] PID | PRIO PROG ARGS }" |
| //usage:#define chrt_full_usage "\n\n" | |
| - | //usage: "Change scheduling priority and class for a process\n" |
| + | //usage: "Change scheduling priority and class (default RR) for a process\n" |
| //usage: "\n -m Show min/max priorities" | |
| //usage: "\n -p Operate on PID" | |
| //usage: "\n -r Set SCHED_RR class" | |
| @@ -133,7 +133,14 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| pid_str = *argv; | |
| } | |
| /* else "-p PID", and *argv == NULL */ | |
| - | pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1); |
| + | pid = xatoul_range(pid_str, 0, ((unsigned)(pid_t)ULONG_MAX) >> 1); |
| + | |
| + | /* sched_{get,set}scheduler accept PID 0 to mean the calling process, |
| + | * but this is needed to display the actual PID like util-linux's chrt |
| + | */ |
| + | if (pid == 0) { |
| + | pid = getpid(); |
| + | } |
| } else { | |
| priority = *argv++; | |
| if (!*argv) | |