mirror of
https://github.com/jart/cosmopolitan.git
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77 lines
3.3 KiB
C
77 lines
3.3 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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│ 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/ioctl.h"
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#include "libc/calls/struct/termios.h"
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#include "libc/calls/struct/winsize.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/kprintf.h"
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#include "libc/log/rop.h"
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#include "libc/str/str.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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struct IoctlPtmGet {
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int m;
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int s;
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char mname[16];
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char sname[16];
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};
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/**
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* Opens new pseudo teletypewriter.
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*
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* @param mfd receives controlling tty rw fd on success
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* @param sfd receives subordinate tty rw fd on success
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* @param tio may be passed to tune a century of legacy behaviors
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* @param wsz may be passed to set terminal display dimensions
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* @params flags is usually O_RDWR|O_NOCTTY
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* @return 0 on success, or -1 w/ errno
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*/
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int openpty(int *mfd, int *sfd, char *name, const struct termios *tio,
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const struct winsize *wsz) {
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int m, s, p;
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const char *t;
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struct IoctlPtmGet ptm;
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RETURN_ON_ERROR((m = posix_openpt(O_RDWR | O_NOCTTY)));
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if (!IsOpenbsd()) {
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RETURN_ON_ERROR(grantpt(m));
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RETURN_ON_ERROR(unlockpt(m));
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if (!(t = ptsname(m))) goto OnError;
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RETURN_ON_ERROR((s = open(t, O_RDWR)));
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} else {
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RETURN_ON_ERROR(ioctl(m, PTMGET, &ptm));
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close(m);
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m = ptm.m;
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s = ptm.s;
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t = ptm.sname;
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}
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*mfd = m;
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*sfd = s;
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if (name) strcpy(name, t);
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if (tio) ioctl(s, TCSETSF, tio);
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if (wsz) ioctl(s, TIOCSWINSZ, wsz);
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return 0;
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OnError:
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if (m != -1) close(m);
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return -1;
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}
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