cosmopolitan/libc/calls/sched_getscheduler.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
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Copyright 2022 Justine Alexandra Roberts Tunney
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Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
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*/
#include "libc/calls/sched-sysv.internal.h"
#include "libc/calls/struct/sched_param.h"
#include "libc/dce.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
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/**
* Gets scheduler policy for `pid`.
*
* @param pid is the id of the process whose scheduling policy should be
* queried. Setting `pid` to zero means the same thing as getpid().
* This applies to all threads associated with the process. Linux is
* special; the kernel treats this as a thread id (noting that
* `getpid() == gettid()` is always the case on Linux for the main
* thread) and will only take effect for the specified tid.
* Therefore this function is POSIX-compliant iif `!__threaded`.
* @return scheduler policy, or -1 w/ errno
* @error ESRCH if `pid` not found
* @error EPERM if not permitted
* @error EINVAL if `pid` is negative on Linux
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*/
int sched_getscheduler(int pid) {
int rc;
if (IsNetbsd()) {
struct sched_param p;
rc = sys_sched_getscheduler_netbsd(pid, &p);
} else {
rc = sys_sched_getscheduler(pid);
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}
STRACE("sched_getscheduler(%d) → %s% m", pid, DescribeSchedPolicy(rc));
return rc;
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}