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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/' ```
56 lines
2.9 KiB
C
56 lines
2.9 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 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/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/calls/termios.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/consts/termios.h"
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#include "libc/sysv/errfuns.h"
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#define TIOCGPGRP_linux 0x0000540f
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#define TIOCGPGRP_bsd 0x40047477
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/**
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* Returns which process group controls terminal.
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*
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* @return process group id on success, or -1 w/ errno
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* @raise ENOTTY if `fd` is isn't controlling teletypewriter
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* @raise EBADF if `fd` isn't an open file descriptor
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* @raise ENOSYS on Windows and Bare Metal
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* @asyncsignalsafe
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*/
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int tcgetpgrp(int fd) {
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int rc, pgrp;
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if (IsLinux()) {
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rc = sys_ioctl(fd, TIOCGPGRP_linux, &pgrp);
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} else if (IsBsd()) {
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rc = sys_ioctl(fd, TIOCGPGRP_bsd, &pgrp);
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} else if (sys_isatty(fd)) {
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pgrp = rc = getpid();
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} else {
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rc = -1; // ebadf, enotty
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}
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STRACE("tcgetpgrp(%d) → %d% m", fd, rc == -1 ? rc : pgrp);
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return rc == -1 ? rc : pgrp;
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}
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