lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1998, 1999 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 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. |
| 8 | |
| 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. |
| 13 | |
| 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. */ |
| 18 | |
| 19 | #include <limits.h> |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | /* If __ASSUME_DEVPTS__ is defined, grantpt() reduces to a stub since we |
| 23 | assume that the devfs/devpts filesystem automatically manages the |
| 24 | permissions. */ |
| 25 | #if !defined __ASSUME_DEVPTS__ |
| 26 | #include <sys/statfs.h> |
| 27 | |
| 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 |
| 32 | |
| 33 | /* Prototype for function that changes ownership and access permission |
| 34 | for slave pseudo terminals that do not live on a `devpts' |
| 35 | filesystem. */ |
| 36 | int __unix_grantpt (int fd); |
| 37 | |
| 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; |
| 42 | #endif |
| 43 | |
| 44 | /* Change the ownership and access permission of the slave pseudo |
| 45 | terminal associated with the master pseudo terminal specified |
| 46 | by FD. */ |
| 47 | int |
| 48 | #if !defined __ASSUME_DEVPTS__ |
| 49 | grantpt (int fd) |
| 50 | #else |
| 51 | grantpt (attribute_unused int fd) |
| 52 | #endif |
| 53 | { |
| 54 | #if !defined __ASSUME_DEVPTS__ |
| 55 | struct statfs fsbuf; |
| 56 | char _buf[PATH_MAX]; |
| 57 | char *buf = _buf; |
| 58 | |
| 59 | if (pts_name (fd, &buf, sizeof (_buf))) |
| 60 | return -1; |
| 61 | |
| 62 | if (__libc_statfs (buf, &fsbuf) < 0) |
| 63 | return -1; |
| 64 | |
| 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); |
| 69 | #endif |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | #if !defined __ASSUME_DEVPTS__ |
| 74 | # define grantpt __unix_grantpt |
| 75 | # include "unix_grantpt.c" |
| 76 | #endif |