/* Copyright (C) 1998, 1999 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #include <limits.h> #include <stdlib.h> /* If __ASSUME_DEVPTS__ is defined, grantpt() reduces to a stub since we assume that the devfs/devpts filesystem automatically manages the permissions. */ #if !defined __ASSUME_DEVPTS__ #include <sys/statfs.h> /* Constant that identifies the `devpts' filesystem. */ #define DEVPTS_SUPER_MAGIC 0x1cd1 /* Constant that identifies the `devfs' filesystem. */ #define DEVFS_SUPER_MAGIC 0x1373 /* Prototype for function that changes ownership and access permission for slave pseudo terminals that do not live on a `devpts' filesystem. */ static int __unix_grantpt (int fd); /* Prototype for private function that gets the name of the slave pseudo terminal in a safe way. */ static int pts_name (int fd, char **pts, size_t buf_len); extern __typeof(statfs) __libc_statfs; /* Change the ownership and access permission of the slave pseudo terminal associated with the master pseudo terminal specified by FD. */ int grantpt (int fd) { struct statfs fsbuf; char _buf[PATH_MAX]; char *buf = _buf; if (pts_name (fd, &buf, sizeof (_buf))) return -1; if (__libc_statfs (buf, &fsbuf) < 0) return -1; /* If the slave pseudo terminal lives on a `devpts' filesystem, the ownership and access permission are already set. */ if (fsbuf.f_type != DEVPTS_SUPER_MAGIC && fsbuf.f_type != DEVFS_SUPER_MAGIC) return __unix_grantpt (fd); return 0; } # define grantpt __unix_grantpt # include "unix_grantpt.c" #else int grantpt (attribute_unused int fd) { return 0; } #endif