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 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
22 /* If __ASSUME_DEVPTS__ is defined, grantpt() reduces to a stub since we
23 assume that the devfs/devpts filesystem automatically manages the
25 #if !defined __ASSUME_DEVPTS__
26 #include <sys/statfs.h>
28 /* Constant that identifies the `devpts' filesystem. */
29 #define DEVPTS_SUPER_MAGIC 0x1cd1
30 /* Constant that identifies the `devfs' filesystem. */
31 #define DEVFS_SUPER_MAGIC 0x1373
33 /* Prototype for function that changes ownership and access permission
34 for slave pseudo terminals that do not live on a `devpts'
36 int __unix_grantpt (int fd);
38 /* Prototype for private function that gets the name of the slave
39 pseudo terminal in a safe way. */
40 static int pts_name (int fd, char **pts, size_t buf_len);
41 extern __typeof(statfs) __libc_statfs;
44 /* Change the ownership and access permission of the slave pseudo
45 terminal associated with the master pseudo terminal specified
48 #if !defined __ASSUME_DEVPTS__
51 grantpt (attribute_unused int fd)
54 #if !defined __ASSUME_DEVPTS__
59 if (pts_name (fd, &buf, sizeof (_buf)))
62 if (__libc_statfs (buf, &fsbuf) < 0)
65 /* If the slave pseudo terminal lives on a `devpts' filesystem, the
66 ownership and access permission are already set. */
67 if (fsbuf.f_type != DEVPTS_SUPER_MAGIC && fsbuf.f_type != DEVFS_SUPER_MAGIC)
68 return __unix_grantpt (fd);
73 #if !defined __ASSUME_DEVPTS__
74 # define grantpt __unix_grantpt
75 # include "unix_grantpt.c"