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49 lines
2.9 KiB
C
49 lines
2.9 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/sched-sysv.internal.h"
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#include "libc/calls/struct/sched_param.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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/**
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* Gets scheduler policy for `pid`.
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*
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* @param pid is the id of the process whose scheduling policy should be
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* queried. Setting `pid` to zero means the same thing as getpid().
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* This applies to all threads associated with the process. Linux is
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* special; the kernel treats this as a thread id (noting that
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* `getpid() == gettid()` is always the case on Linux for the main
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* thread) and will only take effect for the specified tid.
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* @return scheduler policy, or -1 w/ errno
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* @error ESRCH if `pid` not found
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* @error EPERM if not permitted
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* @error EINVAL if `pid` is negative on Linux
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*/
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int sched_getscheduler(int pid) {
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int rc;
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if (IsNetbsd()) {
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struct sched_param p;
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rc = sys_sched_getscheduler_netbsd(pid, &p);
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} else {
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rc = sys_sched_getscheduler(pid);
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}
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STRACE("sched_getscheduler(%d) → %s% m", pid, DescribeSchedPolicy(rc));
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return rc;
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}
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