zdtp: Test that supplementary groups are supported

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -24,6 +24,7 @@ static/timers
 static/futex
 static/futex-rl
 static/xids00
+static/groups
 static/pthread00
 streaming/pipe_loop00
 streaming/pipe_shared00

test/zdtm/live/static/Makefile

@@ -47,6 +47,7 @@ TST_NOFILE	=				\
 		sem				\
 		maps01				\
 		xids00				\
+		groups				\
 		file_fown			\
 		eventfs00			\
 		signalfd00			\

test/zdtm/live/static/groups.c

+#define _GNU_SOURCE
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <grp.h>
+#include <sys/wait.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that supplementary groups are supported";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+int main(int argc, char **argv)
+{
+	unsigned int ng, *grp, *grp2, i, max;
+
+	test_init(argc, argv);
+
+	ng = getgroups(0, NULL);
+	if (ng < 0) {
+		err("Can't get groups");
+		return -1;
+	}
+
+	grp = malloc((ng + 1) * sizeof(*grp));
+	ng = getgroups(ng, grp);
+	if (ng < 0) {
+		err("Can't get groups2");
+		return -1;
+	}
+
+	max = 0;
+	for (i = 0; i < ng; i++)
+		if (max < grp[i])
+			max = grp[i];
+
+	grp[ng++] = max + 1;
+
+	if (setgroups(ng, grp) < 0) {
+		err("Can't set groups");
+		return -1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	grp2 = malloc(ng * sizeof(*grp2));
+
+	if (getgroups(ng, grp2) != ng) {
+		fail("Nr groups changed");
+		return -1;
+	}
+
+	if (memcmp(grp, grp2, ng * sizeof(*grp))) {
+		fail("Groups have changed");
+		return -1;
+	}
+
+	pass();
+
+	return 0;
+}