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313fed01 | 1 | /* Copyright (C) 1998, 2000 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
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5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
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8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
9ffbb612 | 13 | |
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14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include <sys/syscall.h> | |
21 | #include <sys/types.h> | |
22 | #include <unistd.h> | |
23 | ||
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24 | |
25 | #ifdef __NR_setresuid | |
26 | extern int __setresuid (uid_t ruid, uid_t euid, uid_t suid); | |
27 | #endif | |
28 | ||
29 | int | |
30 | seteuid (uid_t uid) | |
31 | { | |
32 | int result; | |
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33 | /* First try the syscall. */ |
34 | #ifdef __NR_setresuid | |
35 | result = __setresuid (-1, uid, -1); | |
36 | if (result == -1 && errno == ENOSYS) | |
37 | /* No system call available. Use emulation. This may not work | |
38 | since `setreuid' also sets the saved user ID when UID is not | |
39 | equal to the real user ID, making it impossible to switch back. */ | |
40 | #endif | |
41 | result = __setreuid (-1, uid); | |
42 | ||
43 | return result; | |
44 | } |