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43 lines
2.6 KiB
C
43 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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int sys_sched_rr_get_interval(int, struct timespec *);
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/**
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* Returns round-robin `SCHED_RR` quantum for `pid`.
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*
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* @param pid is id of process (where 0 is same as getpid())
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* @param tp receives output interval
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* @return 0 on success, or -1 w/ errno
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* @error ENOSYS if not Linux or FreeBSD
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* @error EFAULT if `tp` memory is invalid
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* @error EINVAL if invalid `pid`
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* @error ESRCH if could not find `pid`
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*/
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int sched_rr_get_interval(int pid, struct timespec *tp) {
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int rc;
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rc = sys_sched_rr_get_interval(pid, tp);
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STRACE("sched_rr_get_interval(%d, [%s]) → %d% m", pid,
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DescribeTimespec(rc, tp), rc);
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return rc;
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}
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