summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/ttyname.h
blob: ddd148bb57703987dc54e72e90b0ee0a30a960af (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
/* Copyright (C) 2016-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, see <https://www.gnu.org/licenses/>.  */

#include <unistd.h>
#include <stdbool.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/stat.h>

/* Return true if this is a UNIX98 pty device, as defined in
   linux/Documentation/devices.txt (on linux < 4.10) or
   linux/Documentation/admin-guide/devices.txt (on linux >= 4.10).  */
static inline bool
is_pty (struct stat64 *sb)
{
#ifdef _STATBUF_ST_RDEV
  int m = __gnu_dev_major (sb->st_rdev);
  return (136 <= m && m <= 143);
#else
  return false;
#endif
}

static inline bool
is_mytty (const struct stat64 *mytty, const struct stat64 *maybe)
{
  return (maybe->st_ino == mytty->st_ino
	  && maybe->st_dev == mytty->st_dev
#ifdef _STATBUF_ST_RDEV
	  && S_ISCHR (maybe->st_mode)
	  && maybe->st_rdev == mytty->st_rdev
#endif
	  );
}