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https://github.com/jart/cosmopolitan.git
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46 lines
2.6 KiB
C
46 lines
2.6 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/str/str.h"
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/**
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* Gets kernel scheduling for particular CPUs.
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*
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* @param pid is the process or thread id (or 0 for caller)
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* @param size is byte length of bitset
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* @param bitset receives bitset and should be uint64_t[16] in order to
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* work on older versions of Linux
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* @return 0 on success, or -1 w/ errno
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* @raise ENOSYS on non-Linux
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*/
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int sched_getaffinity(int tid, size_t size, void *bitset) {
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long rc;
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rc = sys_sched_getaffinity(tid, size, bitset);
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if (rc != -1) {
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if (rc < size) {
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memset((char *)bitset + rc, 0, size - rc);
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}
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rc = 0;
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}
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STRACE("sched_getaffinity(%d, %'zu, %p) → %d% m", tid, size, bitset);
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return rc;
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}
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