zdtm: Test that rlimits are c/r-ed

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

test/zdtm.sh

@@ -66,6 +66,7 @@ static/fifo-ghost
 static/fifo
 static/fifo_wronly
 static/zombie00
+static/rlimits00
 transition/fork
 static/pty00
 static/pty01

test/zdtm/live/static/Makefile

@@ -68,6 +68,7 @@ TST_NOFILE	=				\
 		inotify00			\
 		uptime_grow			\
 		session00			\
+		rlimits00			\
 		pty00				\
 		pty01				\
 		pty02				\

test/zdtm/live/static/rlimits00.c

+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that rlimits are saved";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+int main(int argc, char **argv)
+{
+	int r, changed = 0;
+	struct rlimit rlims[RLIM_NLIMITS], trlim;
+
+	test_init(argc, argv);
+
+	for (r = 0; r < RLIM_NLIMITS; r++) {
+		if (getrlimit(r, &rlims[r])) {
+			err("Can't get rlimit");
+			goto out;
+		}
+
+		if (rlims[r].rlim_cur > 1 &&
+				rlims[r].rlim_cur != RLIM_INFINITY) {
+			rlims[r].rlim_cur--;
+
+			if (setrlimit(r, &rlims[r])) {
+				err("Can't set rlimit");
+				goto out;
+			}
+
+			changed = 1;
+		}
+	}
+
+	if (!changed) {
+		err("Can't change any rlimir");
+		goto out;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	for (r = 0; r < RLIM_NLIMITS; r++) {
+		if (getrlimit(r, &trlim)) {
+			fail("Can't get rlimit after rst");
+			goto out;
+		}
+
+		if (rlims[r].rlim_cur != trlim.rlim_cur) {
+			fail("Cur changed");
+			goto out;
+		}
+
+		if (rlims[r].rlim_max != trlim.rlim_max) {
+			fail("Max changed");
+			goto out;
+		}
+	}
+
+	pass();
+out:
+	return 0;
+}
+