89f063b90
Christian Eggers
2020-11-15
Subject
chrt: support for musl C library
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util-linux/chrt.c+32 -2
| @@ -39,6 +39,17 @@ | |
| # define SCHED_IDLE 5 | |
| #endif | |
| + | //musl has no __MUSL__ or similar define to check for, |
| + | //but its <sys/types.h> has these lines: |
| + | // #define __NEED_fsblkcnt_t |
| + | // #define __NEED_fsfilcnt_t |
| + | #if defined(__linux__) && defined(__NEED_fsblkcnt_t) && defined(__NEED_fsfilcnt_t) |
| + | # define LIBC_IS_MUSL 1 |
| + | # include <sys/syscall.h> |
| + | #else |
| + | # define LIBC_IS_MUSL 0 |
| + | #endif |
| + | |
| static const char *policy_name(int pol) | |
| { | |
| if (pol > 6) | |
| @@ -85,6 +96,7 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| char *priority = priority; /* for compiler */ | |
| const char *current_new; | |
| int policy = SCHED_RR; | |
| + | int ret; |
| opt = getopt32(argv, "^" | |
| "+" "mprfobi" | |
| @@ -132,7 +144,15 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| if (opt & OPT_p) { | |
| int pol; | |
| print_rt_info: | |
| + | #if LIBC_IS_MUSL |
| + | /* musl libc returns ENOSYS for its sched_getscheduler library |
| + | * function, because the sched_getscheduler Linux kernel system call |
| + | * does not conform to Posix; so we use the system call directly |
| + | */ |
| + | pol = syscall(SYS_sched_getscheduler, pid); |
| + | #else |
| pol = sched_getscheduler(pid); | |
| + | #endif |
| if (pol < 0) | |
| bb_perror_msg_and_die("can't %cet pid %u's policy", 'g', (int)pid); | |
| #ifdef SCHED_RESET_ON_FORK | |
| @@ -149,7 +169,12 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| printf("pid %u's %s scheduling policy: SCHED_%s\n", | |
| pid, current_new, policy_name(pol) | |
| ); | |
| - | if (sched_getparam(pid, &sp)) |
| + | #if LIBC_IS_MUSL |
| + | ret = syscall(SYS_sched_getparam, pid, &sp); |
| + | #else |
| + | ret = sched_getparam(pid, &sp); |
| + | #endif |
| + | if (ret) |
| bb_perror_msg_and_die("can't get pid %u's attributes", (int)pid); | |
| printf("pid %u's %s scheduling priority: %d\n", | |
| (int)pid, current_new, sp.sched_priority | |
| @@ -168,7 +193,12 @@ int chrt_main(int argc UNUSED_PARAM, char **argv) | |
| sched_get_priority_min(policy), sched_get_priority_max(policy) | |
| ); | |
| - | if (sched_setscheduler(pid, policy, &sp) < 0) |
| + | #if LIBC_IS_MUSL |
| + | ret = syscall(SYS_sched_setscheduler, pid, policy, &sp); |
| + | #else |
| + | ret = sched_setscheduler(pid, policy, &sp); |
| + | #endif |
| + | if (ret) |
| bb_perror_msg_and_die("can't %cet pid %u's policy", 's', (int)pid); | |
| if (!argv[0]) /* "-p PRIO PID [...]" */ | |