setuid.c 765 B

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * setuid() 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. #if (__WORDSIZE == 32 && defined(__NR_setuid32)) || __WORDSIZE == 64
  13. # ifdef __NR_setuid32
  14. # undef __NR_setuid
  15. # define __NR_setuid __NR_setuid32
  16. # endif
  17. _syscall1(int, setuid, uid_t, uid)
  18. #else
  19. # define __NR___syscall_setuid __NR_setuid
  20. static __always_inline _syscall1(int, __syscall_setuid, __kernel_uid_t, uid)
  21. int setuid(uid_t uid)
  22. {
  23. if (uid == (uid_t) ~ 0 || uid != (uid_t) ((__kernel_uid_t) uid)) {
  24. __set_errno(EINVAL);
  25. return -1;
  26. }
  27. return __syscall_setuid(uid);
  28. }
  29. #endif