mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
104 lines
4.4 KiB
C
104 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/blockcancel.internal.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/struct/metatermios.internal.h"
|
|
#include "libc/calls/struct/termios.h"
|
|
#include "libc/calls/struct/winsize.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/calls/syscall_support-sysv.internal.h"
|
|
#include "libc/calls/termios.h"
|
|
#include "libc/calls/termios.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/log/rop.internal.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/at.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/consts/pty.h"
|
|
#include "libc/sysv/consts/termios.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
#define PTMGET 0x40287401 // openbsd
|
|
|
|
struct IoctlPtmGet {
|
|
int m;
|
|
int s;
|
|
char mname[16];
|
|
char sname[16];
|
|
};
|
|
|
|
static int openpty_impl(int *mfd, int *sfd, char *name,
|
|
const struct termios *tio, //
|
|
const struct winsize *wsz) {
|
|
int m, s, p;
|
|
struct IoctlPtmGet t;
|
|
RETURN_ON_ERROR((m = posix_openpt(O_RDWR | O_NOCTTY)));
|
|
if (!IsOpenbsd()) {
|
|
RETURN_ON_ERROR(grantpt(m));
|
|
RETURN_ON_ERROR(unlockpt(m));
|
|
RETURN_ON_ERROR(_ptsname(m, t.sname, sizeof(t.sname)));
|
|
RETURN_ON_ERROR((s = sys_openat(AT_FDCWD, t.sname, O_RDWR, 0)));
|
|
} else {
|
|
RETURN_ON_ERROR(sys_ioctl(m, PTMGET, &t));
|
|
close(m);
|
|
m = t.m;
|
|
s = t.s;
|
|
}
|
|
*mfd = m;
|
|
*sfd = s;
|
|
if (name) strcpy(name, t.sname);
|
|
if (tio) npassert(!tcsetattr(s, TCSAFLUSH, tio));
|
|
if (wsz) npassert(!tcgetwinsize(s, wsz));
|
|
return 0;
|
|
OnError:
|
|
if (m != -1) sys_close(m);
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Opens new pseudo teletypewriter.
|
|
*
|
|
* @param mfd receives controlling tty rw fd on success
|
|
* @param sfd receives subordinate tty rw fd on success
|
|
* @param tio may be passed to tune a century of legacy behaviors
|
|
* @param wsz may be passed to set terminal display dimensions
|
|
* @params flags is usually O_RDWR|O_NOCTTY
|
|
* @return 0 on success, or -1 w/ errno
|
|
*/
|
|
int openpty(int *mfd, int *sfd, char *name, //
|
|
const struct termios *tio, //
|
|
const struct winsize *wsz) {
|
|
int rc;
|
|
if (IsWindows() || IsMetal()) {
|
|
return enosys();
|
|
}
|
|
if (IsAsan() && (!__asan_is_valid(mfd, sizeof(int)) ||
|
|
!__asan_is_valid(sfd, sizeof(int)) ||
|
|
(name && !__asan_is_valid(name, 16)) ||
|
|
(tio && !__asan_is_valid(tio, sizeof(*tio))) ||
|
|
(wsz && !__asan_is_valid(wsz, sizeof(*wsz))))) {
|
|
return efault();
|
|
}
|
|
BLOCK_CANCELLATIONS;
|
|
rc = openpty_impl(mfd, sfd, name, tio, wsz);
|
|
ALLOW_CANCELLATIONS;
|
|
return rc;
|
|
}
|