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/* this tests whether getgroups actually returns lists of integers
rather than gid_t. The test only works if the user running
the test is in at least 1 group
The test is designed to check for those broken OSes that define
getgroups() as returning an array of gid_t but actually return a
array of ints! Ultrix is one culprit
*/
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <grp.h>
int main(void)
{
int i;
int *igroups;
char *cgroups;
int grp = 0;
int ngroups = getgroups(0,&grp);
if (sizeof(gid_t) == sizeof(int)) {
fprintf(stderr,"gid_t and int are the same size\n");
exit(1);
}
if (ngroups <= 0)
ngroups = 32;
igroups = (int *)malloc(sizeof(int)*ngroups);
for (i=0;i<ngroups;i++)
igroups[i] = 0x42424242;
ngroups = getgroups(ngroups,(gid_t *)igroups);
if (igroups[0] == 0x42424242)
ngroups = 0;
if (ngroups == 0) {
printf("WARNING: can't determine getgroups return type\n");
exit(1);
}
cgroups = (char *)igroups;
if (ngroups == 1 &&
cgroups[2] == 0x42 && cgroups[3] == 0x42) {
fprintf(stderr,"getgroups returns gid_t\n");
exit(1);
}
for (i=0;i<ngroups;i++) {
if (igroups[i] == 0x42424242) {
fprintf(stderr,"getgroups returns gid_t\n");
exit(1);
}
}
exit(0);
}
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