mirror of
https://github.com/jart/cosmopolitan.git
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4a59210008
This change improves the way internal APIs are being hidden behind the `COSMO` define. The cosmo.h header will take care of defining that, so that a separate define statement isn't needed. This change also does a lot more to define which APIs are standard, and which belong to Cosmo.
106 lines
4.4 KiB
C
106 lines
4.4 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/assert.h"
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#include "libc/calls/blockcancel.internal.h"
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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/metatermios.internal.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/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/calls/termios.h"
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#include "libc/calls/termios.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/rop.internal.h"
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#include "libc/str/str.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/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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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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static int openpty_impl(int *mfd, int *sfd, char *name,
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const struct termios *tio, //
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const struct winsize *wsz) {
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int m, s, p;
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union metatermios mt;
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struct IoctlPtmGet t;
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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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RETURN_ON_ERROR(_ptsname(m, t.sname, sizeof(t.sname)));
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RETURN_ON_ERROR((s = sys_openat(AT_FDCWD, t.sname, O_RDWR, 0)));
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} else {
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RETURN_ON_ERROR(sys_ioctl(m, PTMGET, &t));
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close(m);
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m = t.m;
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s = t.s;
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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.sname);
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if (tio) _npassert(!sys_ioctl(s, TCSETSF, __termios2host(&mt, tio)));
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if (wsz) _npassert(!sys_ioctl(s, TIOCGWINSZ, wsz));
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return 0;
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OnError:
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if (m != -1) sys_close(m);
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return -1;
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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, //
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const struct termios *tio, //
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const struct winsize *wsz) {
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int rc;
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if (IsWindows() || IsMetal()) {
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return enosys();
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}
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if (IsAsan() && (!__asan_is_valid(mfd, sizeof(int)) ||
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!__asan_is_valid(sfd, sizeof(int)) ||
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(name && !__asan_is_valid(name, 16)) ||
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(tio && !__asan_is_valid(tio, sizeof(*tio))) ||
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(wsz && !__asan_is_valid(wsz, sizeof(*wsz))))) {
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return efault();
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}
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BLOCK_CANCELLATIONS;
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rc = openpty_impl(mfd, sfd, name, tio, wsz);
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ALLOW_CANCELLATIONS;
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return rc;
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}
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