1 /* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 see <http://www.gnu.org/licenses/>. */
21 /* If __ASSUME_DEVPTS__ is defined, grantpt() reduces to a stub since we
22 assume that the devfs/devpts filesystem automatically manages the
24 #if !defined __ASSUME_DEVPTS__
25 #include <sys/statfs.h>
27 /* Constant that identifies the `devpts' filesystem. */
28 #define DEVPTS_SUPER_MAGIC 0x1cd1
29 /* Constant that identifies the `devfs' filesystem. */
30 #define DEVFS_SUPER_MAGIC 0x1373
32 /* Prototype for function that changes ownership and access permission
33 for slave pseudo terminals that do not live on a `devpts'
35 static int __unix_grantpt (int fd
);
37 /* Prototype for private function that gets the name of the slave
38 pseudo terminal in a safe way. */
39 static int pts_name (int fd
, char **pts
, size_t buf_len
);
40 extern __typeof(statfs
) __libc_statfs
;
42 /* Change the ownership and access permission of the slave pseudo
43 terminal associated with the master pseudo terminal specified
51 if (pts_name (fd
, &buf
, sizeof (_buf
)))
54 if (__libc_statfs (buf
, &fsbuf
) < 0)
57 /* If the slave pseudo terminal lives on a `devpts' filesystem, the
58 ownership and access permission are already set. */
59 if (fsbuf
.f_type
!= DEVPTS_SUPER_MAGIC
&& fsbuf
.f_type
!= DEVFS_SUPER_MAGIC
)
60 return __unix_grantpt (fd
);
65 # define grantpt __unix_grantpt
66 # include "unix_grantpt.c"
70 int grantpt (attribute_unused
int fd
)