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/* 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,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#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. */
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);
#endif
/* Change the ownership and access permission of the slave pseudo
terminal associated with the master pseudo terminal specified
by FD. */
int
grantpt (int fd)
{
#if !defined __ASSUME_DEVPTS__
struct statfs fsbuf;
# ifdef PATH_MAX
char _buf[PATH_MAX];
# else
char _buf[512];
# endif
char *buf = _buf;
if (pts_name (fd, &buf, sizeof (_buf)))
return -1;
if (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);
#endif
return 0;
}
#if !defined __ASSUME_DEVPTS__
# define grantpt __unix_grantpt
# include "unix_grantpt.c"
#endif
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