#include <acl/libacl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	int ret, get;
	acl_t acl;
	acl_entry_t entry = NULL;
	acl_entry_t e;
	acl_permset_t permset;
	char *filename = argv[1];

	acl = acl_get_file(filename, ACL_TYPE_ACCESS);
	if (!acl) {
		printf("no acl found");
		exit(1);
	}

	get = acl_get_entry(acl, ACL_FIRST_ENTRY, &e);
	while (get == 1) {
		acl_tag_t t;

		acl_get_tag_type(e, &t);
		if (t == ACL_USER) {
			uid_t *u;

			u = (uid_t *)acl_get_qualifier(e);
			printf("got user acl for %d\n",
				u ? *u : -1);
		} else {
			printf("got non-user acl type %d\n", t);
		}
		get = acl_get_entry(acl, ACL_NEXT_ENTRY, &e);
	}

	acl_get_permset(entry, &permset);
	acl_add_perm(permset, ACL_READ|ACL_WRITE);
	acl_calc_mask(&acl);
	ret = acl_set_file(filename, ACL_TYPE_ACCESS, acl);
	printf("acl_set_file returned %d\n", ret);

	acl_free(acl);
}