libc/sysdeps/linux/common/setgroups.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * setgroups() for uClibc
   4  *
   5  * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * GNU Library General Public License (LGPL) version 2 or later.
   8  */
   9
  10 #include "syscalls.h"
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <grp.h>
  14
  15 libc_hidden_proto(sysconf)
  16
  17 #define __NR___syscall_setgroups __NR_setgroups
  18 static inline _syscall2(int, __syscall_setgroups,
  19                 size_t, size, const __kernel_gid_t *, list);
  20
  21 int setgroups(size_t size, const gid_t *groups)
  22 {
  23         if (size > (size_t) sysconf(_SC_NGROUPS_MAX)) {
  24 ret_error:
  25                 __set_errno(EINVAL);
  26                 return -1;
  27         } else {
  28                 size_t i;
  29                 __kernel_gid_t *kernel_groups = NULL;
  30
  31                 if (size) {
  32                         kernel_groups = (__kernel_gid_t *)malloc(sizeof(*kernel_groups) * size);
  33                         if (kernel_groups == NULL)
  34                                 goto ret_error;
  35                 }
  36
  37                 for (i = 0; i < size; i++) {
  38                         kernel_groups[i] = (groups)[i];
  39                         if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i])) {
  40                                 goto ret_error;
  41                         }
  42                 }
  43
  44                 i = __syscall_setgroups(size, kernel_groups);
  45                 if (kernel_groups)
  46                         free(kernel_groups);
  47                 return i;
  48         }
  49 }
  50 libc_hidden_proto(setgroups)
  51 libc_hidden_def(setgroups)