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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
3.2 KiB
C
68 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 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-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/utmp.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Prepares terminal for login.
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*
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* After this operation `fd` will be used for all stdio handles.
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*
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* @return 0 on success, or -1 w/ errno
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* @raise EPERM if terminal is already controlling another sid?
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* @raise EPERM if pledge() was used without tty
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* @raise ENOTTY if `fd` isn't a teletypewriter
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* @raise ENOSYS on Windows and Metal
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* @raise EBADF if `fd` isn't open
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*/
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int login_tty(int fd) {
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int rc;
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if (!IsLinux() && !IsBsd()) {
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rc = enosys();
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} else if (!isatty(fd)) {
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rc = -1; // validate before changing the process's state
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} else {
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// become session leader
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// we don't care if it fails due to already being the one
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int e = errno;
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sys_setsid();
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errno = e;
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// take control of teletypewriter (requires being leader)
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if ((rc = sys_ioctl(fd, TIOCSCTTY, 0)) != -1) {
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unassert(sys_dup2(fd, 0, 0) == 0);
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unassert(sys_dup2(fd, 1, 0) == 1);
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unassert(sys_dup2(fd, 2, 0) == 2);
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if (fd > 2) {
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unassert(!sys_close(fd));
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}
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rc = 0;
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}
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}
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STRACE("login_tty(%d) → %d% m", fd, rc);
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return rc;
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}
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