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/* Copyright (C) 1998, 2000 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <sys/types.h>
#include <sys/fsuid.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <linux/posix_types.h>
#include "kernel-features.h"
#ifdef __NR_setfsuid
extern int __syscall_setfsuid (__kernel_uid_t);
# ifdef __NR_setfsuid32
extern int __syscall_setfsuid32 (__kernel_uid32_t);
# if __ASSUME_32BITUIDS == 0
/* This variable is shared with all files that need to check for 32bit
uids. */
extern int __libc_missing_32bit_uids;
# endif
# endif /* __NR_setfsuid32 */
int
setfsuid (uid_t uid)
{
# if __ASSUME_32BITUIDS > 0
return INLINE_SYSCALL (setfsuid32, 1, uid);
# else
# ifdef __NR_setfsuid32
if (__libc_missing_32bit_uids <= 0)
{
int result;
int saved_errno = errno;
result = INLINE_SYSCALL (setfsuid32, 1, uid);
if (result == 0 || errno != ENOSYS)
return result;
__set_errno (saved_errno);
__libc_missing_32bit_uids = 1;
}
# endif /* __NR_setfsuid32 */
if (uid != (uid_t) ((__kernel_uid_t) uid))
{
__set_errno (EINVAL);
return -1;
}
return INLINE_SYSCALL (setfsuid, 1, uid);
# endif
}
#endif
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