l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libc/sysdeps/linux/common/setgroups.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * setgroups() 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
  10 #include <sys/syscall.h>
  11
  12 #ifdef __USE_BSD
  13 #include <grp.h>
  14
  15 #if defined(__NR_setgroups32)
  16 # undef __NR_setgroups
  17 # define __NR_setgroups __NR_setgroups32
  18 _syscall2(int, setgroups, size_t, size, const gid_t *, list)
  19
  20 #elif __WORDSIZE == 64
  21 _syscall2(int, setgroups, size_t, size, const gid_t *, list)
  22
  23 #else
  24 # include <errno.h>
  25 # include <stdlib.h>
  26 # include <unistd.h>
  27 # include <sys/types.h>
  28
  29 # define __NR___syscall_setgroups __NR_setgroups
  30 static __always_inline _syscall2(int, __syscall_setgroups,
  31                                  size_t, size, const __kernel_gid_t *, list)
  32
  33 int setgroups(size_t size, const gid_t *groups)
  34 {
  35         if (size > (size_t) sysconf(_SC_NGROUPS_MAX)) {
  36 ret_error:
  37                 __set_errno(EINVAL);
  38                 return -1;
  39         } else {
  40                 size_t i;
  41                 __kernel_gid_t *kernel_groups = NULL;
  42
  43                 if (size) {
  44                         kernel_groups = (__kernel_gid_t *)malloc(sizeof(*kernel_groups) * size);
  45                         if (kernel_groups == NULL)
  46                                 goto ret_error;
  47                 }
  48
  49                 for (i = 0; i < size; i++) {
  50                         kernel_groups[i] = (groups)[i];
  51                         if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i])) {
  52                                 goto ret_error;
  53                         }
  54                 }
  55
  56                 i = __syscall_setgroups(size, kernel_groups);
  57                 free(kernel_groups);
  58                 return i;
  59         }
  60 }
  61 #endif
  62
  63 libc_hidden_def(setgroups)
  64 #endif