source3/tests/getgroups.c

   1 /* this tests whether getgroups actually returns lists of integers
   2    rather than gid_t. The test only works if the user running
   3    the test is in at least 1 group
   4
   5    The test is designed to check for those broken OSes that define
   6    getgroups() as returning an array of gid_t but actually return a
   7    array of ints! Ultrix is one culprit
   8   */
   9
  10 #if defined(HAVE_UNISTD_H)
  11 #include <unistd.h>
  12 #endif
  13
  14 #if defined(HAVE_STDLIB_H)
  15 #include <stdlib.h>
  16 #endif
  17
  18 #include <sys/types.h>
  19 #include <stdio.h>
  20 #include <unistd.h>
  21 #include <grp.h>
  22
  23 main()
  24 {
  25         int i;
  26         int *igroups;
  27         char *cgroups;
  28         int grp = 0;
  29         int  ngroups = getgroups(0,&grp);
  30
  31         if (sizeof(gid_t) == sizeof(int)) {
  32                 fprintf(stderr,"gid_t and int are the same size\n");
  33                 return 1;
  34         }
  35
  36         if (ngroups <= 0)
  37                 ngroups = 32;
  38
  39         igroups = (int *)malloc(sizeof(int)*ngroups);
  40
  41         for (i=0;i<ngroups;i++)
  42                 igroups[i] = 0x42424242;
  43
  44         ngroups = getgroups(ngroups,(gid_t *)igroups);
  45
  46         if (igroups[0] == 0x42424242)
  47                 ngroups = 0;
  48
  49         if (ngroups == 0) {
  50                 printf("WARNING: can't determine getgroups return type\n");
  51                 return 1;
  52         }
  53
  54         cgroups = (char *)igroups;
  55
  56         if (ngroups == 1 &&
  57             cgroups[2] == 0x42 && cgroups[3] == 0x42) {
  58                 fprintf(stderr,"getgroups returns gid_t\n");
  59                 return 1;
  60         }
  61
  62         for (i=0;i<ngroups;i++) {
  63                 if (igroups[i] == 0x42424242) {
  64                         fprintf(stderr,"getgroups returns gid_t\n");
  65                         return 1;
  66                 }
  67         }
  68
  69         return 0;
  70 }