mirror of
https://github.com/jart/cosmopolitan.git
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88 lines
3.8 KiB
C
88 lines
3.8 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/cpuset.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/process.h"
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#include "libc/nt/runtime.h"
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#include "libc/proc/proc.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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static dontinline textwindows int sys_sched_getaffinity_nt(int pid, size_t size,
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cpu_set_t *bitset) {
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int64_t handle;
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uint64_t SystemAffinityMask;
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if (!(handle = __proc_handle(pid))) {
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return esrch();
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}
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if (GetProcessAffinityMask(handle, bitset->__bits, &SystemAffinityMask)) {
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return 8;
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} else if (GetLastError() == kNtErrorInvalidHandle) {
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return esrch();
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} else {
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return __winerr();
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}
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}
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/**
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* Gets CPU affinity for process.
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*
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* @param pid is the process id (or 0 for caller)
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* @param size is bytes in bitset, which should be `sizeof(cpuset_t)`
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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 if not Linux, FreeBSD, NetBSD, or Windows
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* @see pthread_getaffinity_np() for threads
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*/
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int sched_getaffinity(int pid, size_t size, cpu_set_t *bitset) {
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int rc;
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if (size != sizeof(cpu_set_t)) {
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rc = einval();
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} else if (IsWindows()) {
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rc = sys_sched_getaffinity_nt(pid, size, bitset);
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} else if (IsFreebsd()) {
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if (!sys_sched_getaffinity_freebsd(CPU_LEVEL_WHICH, CPU_WHICH_PID, pid, 32,
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bitset)) {
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rc = 32;
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} else {
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rc = -1;
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}
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} else if (IsNetbsd()) {
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if (!sys_sched_getaffinity_netbsd(P_ALL_LWPS, pid, 32, bitset)) {
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rc = 32;
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} else {
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rc = -1;
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}
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} else {
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rc = sys_sched_getaffinity(pid, size, bitset);
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}
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if (rc > 0) {
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if (rc < size) {
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bzero((char *)bitset + rc, 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", pid, size, bitset, rc);
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return rc;
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}
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