| /* Copyright (C) 1998,2000,2002,2003,2004,2006 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 <unistd.h> |
| #include <setxid.h> |
| #include <kernel-features.h> |
| |
| |
| #ifdef __NR_setresuid |
| extern int __setresuid (uid_t ruid, uid_t euid, uid_t suid); |
| #endif |
| |
| int |
| seteuid (uid_t uid) |
| { |
| int result; |
| |
| if (uid == (uid_t) ~0) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| #if __ASSUME_32BITUIDS > 0 |
| result = INLINE_SETXID_SYSCALL (setresuid32, 3, -1, uid, -1); |
| #else |
| /* First try the syscall. */ |
| # ifdef __NR_setresuid |
| result = __setresuid (-1, uid, -1); |
| # if __ASSUME_SETRESUID_SYSCALL > 0 |
| if (0) |
| # else |
| if (result == -1 && errno == ENOSYS) |
| # endif |
| /* No system call available. Use emulation. This may not work |
| since `setreuid' also sets the saved user ID when UID is not |
| equal to the real user ID, making it impossible to switch back. */ |
| # endif |
| result = __setreuid (-1, uid); |
| #endif |
| |
| return result; |
| } |
| libc_hidden_def (seteuid) |
