mirror of
https://github.com/jart/cosmopolitan.git
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90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
/*-*- 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 2020 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/sigset.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/nt/process.h"
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#include "libc/runtime/internal.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/tls.h"
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int _fork(uint32_t dwCreationFlags) {
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axdx_t ad;
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sigset_t old, all;
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int ax, dx, parent, parent_tid = 0;
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if (_weaken(_pthread_atfork)) {
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parent_tid = gettid();
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}
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if (!IsWindows()) {
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sigfillset(&all);
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sys_sigprocmask(SIG_BLOCK, &all, &old);
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ad = sys_fork();
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ax = ad.ax;
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dx = ad.dx;
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if (IsXnu() && ax != -1) {
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// eax always returned with childs pid
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// edx is 0 for parent and 1 for child
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ax &= dx - 1;
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}
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} else {
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ax = sys_fork_nt(dwCreationFlags);
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}
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if (!ax) {
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if (!IsWindows()) {
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dx = sys_getpid().ax;
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} else {
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dx = GetCurrentProcessId();
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}
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parent = __pid;
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__pid = dx;
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if (__tls_enabled) {
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atomic_store_explicit(&__get_tls()->tib_tid,
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IsLinux() ? dx : sys_gettid(),
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memory_order_relaxed);
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}
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if (_weaken(_pthread_atfork)) {
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_weaken(_pthread_atfork)(parent_tid);
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}
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if (!IsWindows()) sys_sigprocmask(SIG_SETMASK, &old, 0);
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STRACE("fork() → 0 (child of %d)", parent);
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} else {
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if (!IsWindows()) sys_sigprocmask(SIG_SETMASK, &old, 0);
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STRACE("fork() → %d% m", ax);
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}
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return ax;
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}
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/**
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* Creates new process.
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*
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* @return 0 to child, child pid to parent, or -1 w/ errno
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* @raise EAGAIN if `RLIMIT_NPROC` was exceeded or system lacked resources
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* @raise ENOMEM if we require more vespene gas
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* @asyncsignalsafe
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*/
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int fork(void) {
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return _fork(0);
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}
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