58 lines
2.9 KiB
C
58 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 net 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/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/sysv/consts/o.h"
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#include "libc/sysv/consts/pty.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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* Opens new pseudo teletypewriter.
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*
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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 fd, ilduce;
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struct IoctlPtmGet ptm;
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if ((flags & O_ACCMODE) != O_RDWR) return einval();
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if (SupportsFreebsd() &&
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((fd = posix_openpt$sysv(flags)) != -1 || errno != ENOSYS)) {
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return fd;
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} else if ((fd = open("/dev/ptmx", flags)) != -1 || errno != ENOENT) {
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return fd;
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} else if (SupportsOpenbsd() &&
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((fd = open("/dev/ptm", flags)) != -1 || errno != ENOENT)) {
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if (ioctl(fd, PTMGET, &ptm) != -1) {
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close(ptm.workerfd);
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ilduce = ptm.theduxfd;
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} else {
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ilduce = -1;
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}
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close(fd);
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return ilduce;
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} else {
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return enosys();
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}
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}
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