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