toaruos/apps/groups.c

38 lines
860 B
C

/**
* @brief List group memberships.
* @file apps/groups.c
*
* @copyright
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2021 K. Lange
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
int main(int argc, char ** argv) {
/* First print our egid group */
struct passwd * p = getpwuid(getegid());
if (p) {
fprintf(stdout, "%s ", p->pw_name);
}
/* Then get the group list. */
int groupCount = getgroups(0, NULL);
if (groupCount) {
gid_t * myGroups = malloc(sizeof(gid_t) * groupCount);
groupCount = getgroups(groupCount, myGroups);
for (int i = 0; i < groupCount; ++i) {
p = getpwuid(myGroups[i]);
if (p) {
fprintf(stdout, "%s ", p->pw_name);
}
}
}
fprintf(stdout,"\n");
endpwent();
return 0;
}