static void listGroupMembers(gid_t gid, uint maxCount, std::function<void(passwd *)> handleNextGroupUser)
{
if (maxCount == 0) {
return;
}
struct group *g = getgrgid(gid);
if (!g) {
return;
}
uint found = 0;
QVarLengthArray<uid_t> addedUsers;
struct passwd *p = 0;
for (char **user = g->gr_mem; *user; user++) {
if ((p = getpwnam(*user))) {
addedUsers.append(p->pw_uid);
handleNextGroupUser(p);
found++;
if (found >= maxCount) {
break;
}
}
}
//gr_mem doesn't contain users where the primary group == gid -> we have to iterate over all users
setpwent();
while ((p = getpwent()) && found < maxCount) {
if (p->pw_gid != gid) {
continue; // only need primary gid since otherwise gr_mem already contains this user
}
// make sure we don't list a user twice
if (std::find(addedUsers.cbegin(), addedUsers.cend(), p->pw_uid) == addedUsers.cend()) {
handleNextGroupUser(p);
found++;
}
}
endpwent();
}
