mirror of
https://github.com/jart/cosmopolitan.git
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86 lines
3.3 KiB
C
86 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/syscall-sysv.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/fmt/itoa.h"
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#include "libc/paths.h"
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#include "libc/str/str.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 fiodgname_arg {
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int len;
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void *buf;
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};
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static int PtsName(int fd, char *buf, size_t size) {
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if (size < 9 + 12) return erange();
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if (_isptmaster(fd)) return -1;
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if (IsLinux()) {
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int pty;
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if (sys_ioctl(fd, TIOCGPTN, &pty)) return -1;
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buf[0] = '/', buf[1] = 'd', buf[2] = 'e', buf[3] = 'v';
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buf[4] = '/', buf[5] = 'p', buf[6] = 't', buf[7] = 's';
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buf[8] = '/', FormatInt32(buf + 9, pty);
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return 0;
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}
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if (IsFreebsd()) {
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struct fiodgname_arg fgn = {size - 5, buf + 5};
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buf[0] = '/', buf[1] = 'd';
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buf[2] = 'e', buf[3] = 'v';
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buf[4] = '/', buf[5] = 0;
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if (sys_ioctl(fd, FIODGNAME, &fgn) == -1) {
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if (errno == EINVAL) errno = ERANGE;
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return -1;
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}
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return 0;
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}
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if (IsXnu()) {
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char b2[128];
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if (sys_ioctl(fd, TIOCPTYGNAME, b2)) return -1;
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if (strlen(b2) + 1 > size) return erange();
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strcpy(buf, b2);
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return 0;
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}
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return enosys();
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}
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/**
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* Gets name subordinate pseudoteletypewriter.
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*
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* @return 0 on success, or errno on error
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*/
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errno_t ptsname_r(int fd, char *buf, size_t size) {
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int rc, e = errno;
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if (!PtsName(fd, buf, size)) {
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rc = 0;
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} else {
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rc = errno;
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errno = e;
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}
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return rc;
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}
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