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04277e02 | 1 | /* Copyright (C) 1998-2019 Free Software Foundation, Inc. |
6591c335 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6591c335 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6591c335 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6591c335 | 18 | |
6591c335 | 19 | #include <errno.h> |
9b3c7c3c | 20 | #include <fcntl.h> |
6591c335 | 21 | #include <stdlib.h> |
d7807bfa UD |
22 | #include <unistd.h> |
23 | #include <paths.h> | |
24 | #include <sys/statfs.h> | |
25 | ||
1503837c | 26 | #include "linux_fsinfo.h" |
9c9f3b17 | 27 | |
9b3c7c3c | 28 | /* Path to the master pseudo terminal cloning device. */ |
d7807bfa UD |
29 | #define _PATH_DEVPTMX _PATH_DEV "ptmx" |
30 | /* Directory containing the UNIX98 pseudo terminals. */ | |
31 | #define _PATH_DEVPTS _PATH_DEV "pts" | |
6591c335 | 32 | |
9b3c7c3c | 33 | /* Prototype for function that opens BSD-style master pseudo-terminals. */ |
3ee8209b | 34 | extern int __bsd_getpt (void) attribute_hidden; |
6591c335 | 35 | |
9b3c7c3c | 36 | /* Open a master pseudo terminal and return its file descriptor. */ |
6591c335 | 37 | int |
bd2260a2 | 38 | __posix_openpt (int oflag) |
6591c335 | 39 | { |
c4563d2d | 40 | static int have_no_dev_ptmx; |
9b3c7c3c | 41 | int fd; |
6591c335 | 42 | |
c4563d2d | 43 | if (!have_no_dev_ptmx) |
6591c335 | 44 | { |
0101a56f | 45 | fd = __open (_PATH_DEVPTMX, oflag); |
6591c335 | 46 | if (fd != -1) |
d7807bfa UD |
47 | { |
48 | struct statfs fsbuf; | |
49 | static int devpts_mounted; | |
50 | ||
9c9f3b17 UD |
51 | /* Check that the /dev/pts filesystem is mounted |
52 | or if /dev is a devfs filesystem (this implies /dev/pts). */ | |
d7807bfa UD |
53 | if (devpts_mounted |
54 | || (__statfs (_PATH_DEVPTS, &fsbuf) == 0 | |
9c9f3b17 | 55 | && fsbuf.f_type == DEVPTS_SUPER_MAGIC) |
0101a56f | 56 | || (__statfs (_PATH_DEV, &fsbuf) == 0 |
9c9f3b17 | 57 | && fsbuf.f_type == DEVFS_SUPER_MAGIC)) |
d7807bfa UD |
58 | { |
59 | /* Everything is ok. */ | |
60 | devpts_mounted = 1; | |
61 | return fd; | |
62 | } | |
63 | ||
64 | /* If /dev/pts is not mounted then the UNIX98 pseudo terminals | |
d79eccd6 | 65 | are not usable. */ |
d7807bfa UD |
66 | __close (fd); |
67 | have_no_dev_ptmx = 1; | |
d79eccd6 | 68 | __set_errno (ENOENT); |
d7807bfa | 69 | } |
6591c335 UD |
70 | else |
71 | { | |
72 | if (errno == ENOENT || errno == ENODEV) | |
c4563d2d | 73 | have_no_dev_ptmx = 1; |
6591c335 UD |
74 | else |
75 | return -1; | |
76 | } | |
77 | } | |
d79eccd6 AS |
78 | else |
79 | __set_errno (ENOENT); | |
6591c335 | 80 | |
0101a56f UD |
81 | return -1; |
82 | } | |
83 | weak_alias (__posix_openpt, posix_openpt) | |
84 | ||
85 | ||
86 | int | |
87 | __getpt (void) | |
88 | { | |
89 | int fd = __posix_openpt (O_RDWR); | |
90 | if (fd == -1) | |
91 | fd = __bsd_getpt (); | |
92 | return fd; | |
6591c335 | 93 | } |
9b3c7c3c | 94 | |
0101a56f | 95 | |
9b3c7c3c UD |
96 | #define PTYNAME1 "pqrstuvwxyzabcde"; |
97 | #define PTYNAME2 "0123456789abcdef"; | |
98 | ||
99 | #define __getpt __bsd_getpt | |
0101a56f | 100 | #define HAVE_POSIX_OPENPT |
9b3c7c3c | 101 | #include <sysdeps/unix/bsd/getpt.c> |