libc/sysdeps/linux/common/seteuid.c

   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 <pwd.h>
  11 #include <sys/types.h>
  12 #include <sys/syscall.h>
  13
  14 #if !defined __UCLIBC_LINUX_SPECIFIC__
  15 #undef __NR_setresuid
  16 #undef __NR_setresuid32
  17 #endif
  18
  19 int seteuid(uid_t uid)
  20 {
  21     int result;
  22
  23     if (uid == (uid_t) ~0)
  24     {
  25         __set_errno (EINVAL);
  26         return -1;
  27     }
  28
  29 #if (defined __NR_setresuid || defined __NR_setresuid32) && defined __USE_GNU
  30     result = setresuid(-1, uid, -1);
  31     if (result == -1 && errno == ENOSYS)
  32         /* Will also set the saved user ID if euid != uid,
  33          * making it impossible to switch back...*/
  34 #endif
  35         result = setreuid(-1, uid);
  36
  37     return result;
  38 }
  39 libc_hidden_def(seteuid)