mirror of
https://github.com/jart/cosmopolitan.git
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d2f49ca175
Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
127 lines
5.2 KiB
C
127 lines
5.2 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/assert.h"
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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/dll.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/files.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/nt/synchronization.h"
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#include "libc/nt/thread.h"
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#include "libc/proc/proc.internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/syslib.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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struct Dll *e;
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int ax, dx, tid, parent;
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parent = __pid;
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BLOCK_SIGNALS;
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if (IsWindows()) __proc_lock();
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if (__threaded && _weaken(_pthread_onfork_prepare)) {
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_weaken(_pthread_onfork_prepare)();
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}
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if (!IsWindows()) {
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ax = sys_fork();
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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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// get new process id
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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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__pid = dx;
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// turn other threads into zombies
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// we can't free() them since we're monopolizing all locks
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// we assume the operating system already reclaimed system handles
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struct CosmoTib *tib = __get_tls();
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struct PosixThread *pt = (struct PosixThread *)tib->tib_pthread;
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dll_remove(&_pthread_list, &pt->list);
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for (e = dll_first(_pthread_list); e; e = dll_next(_pthread_list, e)) {
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atomic_store_explicit(&POSIXTHREAD_CONTAINER(e)->pt_status,
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kPosixThreadZombie, memory_order_relaxed);
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atomic_store_explicit(&POSIXTHREAD_CONTAINER(e)->tib->tib_syshand, 0,
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memory_order_relaxed);
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}
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dll_make_first(&_pthread_list, &pt->list);
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// get new main thread id
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tid = IsLinux() || IsXnuSilicon() ? dx : sys_gettid();
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atomic_store_explicit(&tib->tib_tid, tid, memory_order_relaxed);
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atomic_store_explicit(&pt->ptid, tid, memory_order_relaxed);
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// get new system thread handle
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intptr_t syshand = 0;
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if (IsXnuSilicon()) {
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syshand = __syslib->__pthread_self();
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} else if (IsWindows()) {
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DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
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GetCurrentProcess(), &syshand, 0, false,
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kNtDuplicateSameAccess);
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}
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atomic_store_explicit(&tib->tib_syshand, syshand, memory_order_relaxed);
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// we can't be canceled if the canceler no longer exists
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atomic_store_explicit(&pt->pt_canceled, false, memory_order_relaxed);
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// run user fork callbacks
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if (__threaded && _weaken(_pthread_onfork_child)) {
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_weaken(_pthread_onfork_child)();
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}
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STRACE("fork() → 0 (child of %d)", parent);
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} else {
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// this is the parent process
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if (__threaded && _weaken(_pthread_onfork_parent)) {
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_weaken(_pthread_onfork_parent)();
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}
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if (IsWindows()) __proc_unlock();
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STRACE("fork() → %d% m", ax);
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}
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ALLOW_SIGNALS;
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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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