1#include <stdio.h> 2#include <unistd.h> 3#include <grp.h> 4#include <pwd.h> 5#include <sys/types.h> 6 7int main(int argc, char **argv) 8{ 9 int result, ngroups, i; 10 gid_t *groups; 11 struct passwd *pw; 12 13 if (!(pw = getpwnam(argv[1]))) { 14 printf("FAIL: no passwd entry for %s\n", argv[1]); 15 return 1; 16 } 17 18 result = initgroups(argv[1], pw->pw_gid); 19 20 if (result == -1) { 21 printf("FAIL"); 22 return 1; 23 } 24 25 ngroups = getgroups(0, NULL); 26 27 groups = (gid_t *)malloc(sizeof(gid_t) * ngroups); 28 ngroups = getgroups(ngroups, groups); 29 30 printf("%s is a member of groups:\n", argv[1]); 31 32 for (i = 0; i < ngroups; i++) { 33 struct group *grp; 34 35 grp = getgrgid(groups[i]); 36 37 printf("%d (%s)\n", groups[i], grp ? grp->gr_name : "?"); 38 } 39 40 printf("PASS\n"); 41 return 0; 42} 43