1 /*
2  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
3  *
4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
5  */
6 
7 #include <unistd.h>
8 #include <stdio.h>
9 #include <errno.h>
10 #include <grp.h>
11 #include <sys/types.h>
12 #include <sys/syscall.h>
13 
14 
15 #if !defined __UCLIBC_LINUX_SPECIFIC__
16 #undef __NR_setresgid
17 #undef __NR_setresgid32
18 #endif
19 
setegid(gid_t gid)20 int setegid(gid_t gid)
21 {
22     int result;
23 
24     if (gid == (gid_t) ~0)
25     {
26 	__set_errno (EINVAL);
27 	return -1;
28     }
29 
30 #if (defined __NR_setresgid || defined __NR_setresgid32) && defined __USE_GNU
31     result = setresgid(-1, gid, -1);
32     if (result == -1 && errno == ENOSYS)
33 	/* Will also set the saved group ID if egid != gid,
34 	 * making it impossible to switch back...*/
35 #endif
36 	result = setregid(-1, gid);
37 
38     return result;
39 }
40