/* 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 */ #include <sys/types.h> #include <stdio.h> #include <unistd.h> #include <grp.h> main() { 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); }