mirror of
https://github.com/jart/cosmopolitan.git
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63 lines
3.2 KiB
C
63 lines
3.2 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 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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*
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* @param pid is process id (may be zero for current process)
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* @param pgid is process group id (may be zero for current process)
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* @return 0 on success, or -1 w/ errno
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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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// "When a process is created with kNtCreateNewProcessGroup
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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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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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