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65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
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/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <limits.h>
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#include <stdlib.h>
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#include <sys/statfs.h>
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/* Constant that identifies the `devpts' filesystem. */
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#define DEVPTS_SUPER_MAGIC 0x1cd1
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/* Prototype for function that changes ownership and access permission
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for slave pseudo terminals that do not live on a `devpts'
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filesystem. */
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int __unix_grantpt (int fd);
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/* Prototype for private function that gets the name of the slave
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pseudo terminal in a safe way. */
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static int pts_name (int fd, char **pts, size_t buf_len);
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/* Change the ownership and access permission of the slave pseudo
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terminal associated with the master pseudo terminal specified
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by FD. */
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int
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grantpt (int fd)
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{
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struct statfs fsbuf;
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#ifdef PATH_MAX
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char _buf[PATH_MAX];
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#else
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char _buf[512];
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#endif
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char *buf = _buf;
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if (pts_name (fd, &buf, sizeof (_buf)))
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return -1;
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if (__statfs (buf, &fsbuf) < 0)
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return -1;
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/* If the slave pseudo terminal lives on a `devpts' filesystem, the
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ownership and access permission are already set. */
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if (fsbuf.f_type == DEVPTS_SUPER_MAGIC)
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return 0;
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return __unix_grantpt (fd);
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}
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#define grantpt __unix_grantpt
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#include <sysdeps/unix/grantpt.c>
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