1/* 2 * Lookup a group by gid. 3 */ 4 5#include <stdio.h> 6#include <grp.h> 7#include <sys/types.h> 8 9int main(int argc, char **argv) 10{ 11 struct group *gr; 12 gid_t gid; 13 14 /* Check args */ 15 16 if (argc != 2) { 17 printf("ERROR: no arg specified\n"); 18 exit(1); 19 } 20 21 if ((gid = atoi(argv[1])) == 0) { 22 printf("ERROR: invalid gid specified\n"); 23 exit(1); 24 } 25 26 /* Do getgrgid() */ 27 28 if ((gr = getgrgid(gid)) == NULL) { 29 printf("FAIL: gid %d does not exist\n", gid); 30 exit(1); 31 } 32 33 /* Print group info */ 34 35 printf("PASS: gid %d exists\n", gid); 36 printf("gr_name = %s\n", gr->gr_name); 37 printf("gr_passwd = %s\n", gr->gr_passwd); 38 printf("gr_gid = %d\n", gr->gr_gid); 39 40 /* Group membership */ 41 42 if (gr->gr_mem != NULL) { 43 int i = 0; 44 45 printf("gr_mem = "); 46 while(gr->gr_mem[i] != NULL) { 47 printf("%s", gr->gr_mem[i]); 48 i++; 49 if (gr->gr_mem != NULL) { 50 printf(","); 51 } 52 } 53 printf("\n"); 54 } 55 56 exit(0); 57} 58