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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
68 lines
2.8 KiB
C
68 lines
2.8 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/nt/enum/processcreationflags.h"
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#include "libc/paths.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/o.h"
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/**
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* Runs process in background.
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*
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* On Unix this calls fork() and setsid(). On Windows this is
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* implemented using CreateProcess(kNtDetachedProcess).
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*
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* @return 0 on success, or -1 w/ errno
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*/
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int daemon(int nochdir, int noclose) {
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int fd;
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switch (_fork(kNtDetachedProcess)) {
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case -1:
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return -1;
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case 0:
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break;
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default:
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_Exit(0);
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}
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if (!IsWindows()) {
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if (setsid() == -1) {
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return -1;
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}
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}
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if (!nochdir) {
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unassert(!chdir("/"));
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}
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if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR)) != -1) {
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unassert(dup2(fd, 0) == 0);
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unassert(dup2(fd, 1) == 1);
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unassert(dup2(fd, 2) == 2);
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if (fd > 2) {
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unassert(!close(fd));
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}
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}
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return 0;
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}
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