/* * Print out the gids of all groups for the current user.  This is like * `id -G` on Linux, but it's too hard to find a portable equivalent. * * Copyright (C) 2002 Martin Pool * Copyright (C) 2003-2020 Wayne Davison * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 3 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, visit the http://fsf.org website. */ #include "rsync.h"  int main(UNUSED(int argc), UNUSED(char *argv[])){	int n, i;	gid_t *list;	gid_t gid = MY_GID();	int gid_in_list = 0; #ifdef HAVE_GETGROUPS	if ((n = getgroups(0, NULL)) < 0) {		perror("getgroups");		return 1;	}#else	n = 0;#endif 	list = (gid_t*)malloc(sizeof (gid_t) * (n + 1));	if (!list) {		fprintf(stderr, "out of memory!\n");		exit(1);	} #ifdef HAVE_GETGROUPS	if (n > 0)		n = getgroups(n, list);#endif 	for (i = 0; i < n; i++)  {		printf("%lu ", (unsigned long)list[i]);		if (list[i] == gid)			gid_in_list = 1;	}	/* The default gid might not be in the list on some systems. */	if (!gid_in_list)		printf("%lu", (unsigned long)gid);	printf("\n"); 	free(list);	return 0;}