libc/sysdeps/linux/common/setreuid.c

   1 /*
   2  * setreuid() for uClibc
   3  *
   4  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   5  *
   6  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   7  */
   8
   9 #include <sys/syscall.h>
  10 #include <unistd.h>
  11 #include <bits/wordsize.h>
  12
  13
  14 #if (__WORDSIZE == 32 && defined(__NR_setreuid32)) || __WORDSIZE == 64
  15 # ifdef __NR_setreuid32
  16 #  undef __NR_setreuid
  17 #  define __NR_setreuid __NR_setreuid32
  18 # endif
  19
  20 _syscall2(int, setreuid, uid_t, ruid, uid_t, euid)
  21
  22 #else
  23
  24 # define __NR___syscall_setreuid __NR_setreuid
  25 static __inline__ _syscall2(int, __syscall_setreuid,
  26                 __kernel_uid_t, ruid, __kernel_uid_t, euid)
  27
  28 int setreuid(uid_t ruid, uid_t euid)
  29 {
  30         if (((ruid + 1) > (uid_t) ((__kernel_uid_t) - 1U))
  31                 || ((euid + 1) > (uid_t) ((__kernel_uid_t) - 1U))) {
  32                 __set_errno(EINVAL);
  33                 return -1;
  34         }
  35         return (__syscall_setreuid(ruid, euid));
  36 }
  37 #endif
  38
  39 libc_hidden_weak(setreuid)