setreuid.c 938 B

1234567891011121314151617181920212223242526272829303132333435363738394041
  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * setreuid() for uClibc
  4. *
  5. * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
  6. *
  7. * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  8. */
  9. #include <sys/syscall.h>
  10. #include <unistd.h>
  11. #include <bits/wordsize.h>
  12. libc_hidden_proto(setreuid)
  13. #if (__WORDSIZE == 32 && defined(__NR_setreuid32)) || __WORDSIZE == 64
  14. # ifdef __NR_setreuid32
  15. # undef __NR_setreuid
  16. # define __NR_setreuid __NR_setreuid32
  17. # endif
  18. _syscall2(int, setreuid, uid_t, ruid, uid_t, euid);
  19. #else
  20. # define __NR___syscall_setreuid __NR_setreuid
  21. static inline _syscall2(int, __syscall_setreuid,
  22. __kernel_uid_t, ruid, __kernel_uid_t, euid);
  23. int setreuid(uid_t ruid, uid_t euid)
  24. {
  25. if (((ruid + 1) > (uid_t) ((__kernel_uid_t) - 1U))
  26. || ((euid + 1) > (uid_t) ((__kernel_uid_t) - 1U))) {
  27. __set_errno(EINVAL);
  28. return -1;
  29. }
  30. return (__syscall_setreuid(ruid, euid));
  31. }
  32. #endif
  33. libc_hidden_def(setreuid)