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#define _GNU_SOURCE
#include <grp.h>
#include <stdio.h>
#include <string.h>
#define BUFLEN 4096
int main() {
struct group gr, *grp;
char buf[BUFLEN];
int i, cnt;
cnt = 0;
setgrent();
while (1) {
i = getgrent_r(&gr, buf, BUFLEN, &grp);
if (i) {
printf("status: %d\n", i);
break;
}
printf("\n%d: %s (%d)\n", cnt, grp->gr_name, grp->gr_gid);
int num_members = strlen((char*)grp->gr_mem) / sizeof(char*);
for (i = 0; i < num_members; i++)
printf("%s ", grp->gr_mem[i]);
if (num_members) printf("\n");
cnt++;
}
endgrent();
return 0;
}
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