mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
c7a8cd21e9
This change improves copy_file_range(), sendfile(), splice(), openpty(), closefrom(), close_range(), fadvise() and posix_fadvise() in addition to writing tests that confirm things like errno and seeking behavior across platforms. We now less aggressively polyfill behavior with some of these functions when the platform support isn't available. Please see: https://justine.lol/cosmopolitan/functions.html
92 lines
4 KiB
C
92 lines
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/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.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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#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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/**
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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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union metatermios mt;
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struct IoctlPtmGet t;
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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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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_open(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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