mirror of
https://github.com/jart/cosmopolitan.git
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53 lines
2.8 KiB
C
53 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 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/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/errno.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Opens new pseudo teletypewriter.
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*
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* @return fd of master pty, or -1 w/ errno
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* @params flags is usually O_RDWR|O_NOCTTY
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* @return file descriptor, or -1 w/ errno
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*/
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int posix_openpt(int flags) {
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int rc;
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if ((flags & O_ACCMODE) != O_RDWR) {
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rc = einval();
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} else if (IsLinux() || IsXnu() || IsNetbsd()) {
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rc = sys_openat(AT_FDCWD, "/dev/ptmx", flags, 0);
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} else if (IsOpenbsd()) {
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rc = sys_openat(AT_FDCWD, "/dev/ptm", flags, 0);
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} else if (IsFreebsd()) {
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rc = sys_posix_openpt(flags);
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if (rc == -1 && errno == ENOSPC)
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errno = EAGAIN;
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} else {
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rc = enosys();
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}
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STRACE("posix_openpt(%s) → %d% m", DescribeOpenFlags(flags), rc);
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return rc;
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}
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