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https://github.com/jart/cosmopolitan.git
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60cb435cb4
If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
60 lines
3.1 KiB
C
60 lines
3.1 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 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/syscall-sysv.internal.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.internal.h"
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#include "libc/nt/console.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Changes process group for process.
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* @vforksafe
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*/
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int setpgid(int pid, int pgid) {
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int rc, me;
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if (!IsWindows()) {
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rc = sys_setpgid(pid, pgid);
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} else {
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me = getpid();
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if ((!pid || pid == me) && (!pgid || pgid == me)) {
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/*
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* "When a process is created with CREATE_NEW_PROCESS_GROUP
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* specified, an implicit call to SetConsoleCtrlHandler(NULL,TRUE)
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* is made on behalf of the new process; this means that the new
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* process has CTRL+C disabled. This lets shells handle CTRL+C
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* themselves, and selectively pass that signal on to
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* sub-processes. CTRL+BREAK is not disabled, and may be used to
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* interrupt the process/process group."
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* ──Quoth MSDN § CreateProcessW()
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*/
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if (SetConsoleCtrlHandler(0, 1)) {
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rc = 0;
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} else {
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rc = __winerr();
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}
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} else {
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// irregular use cases not supported on windows
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rc = einval();
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}
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}
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STRACE("setpgid(%d, %d) → %d% m", pid, pgid, rc);
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return rc;
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}
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