tests: Add a test for max_sockets

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/tests/test_max_sockets.c b/tests/test_max_sockets.c
new file mode 100644
index 0000000..0aac181
--- /dev/null
+++ b/tests/test_max_sockets.c
@@ -0,0 +1,110 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include "config.h"
+#include "torture.h"
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#ifdef HAVE_RPC_RPC_H
+#include <rpc/rpc.h>
+#endif
+
+
+#define MAX_SOCKETS 4
+
+static int setup(void **state)
+{
+	int ret;
+	char str[10];
+
+	torture_setup_socket_dir(state);
+
+	ret = snprintf(str, 10, "%d", MAX_SOCKETS);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = setenv("SOCKET_WRAPPER_MAX_SOCKETS", str, 1);
+
+	return 0;
+}
+
+static int teardown(void **state)
+{
+	torture_teardown_socket_dir(state);
+
+	return 0;
+}
+
+static int _socket(int *_s)
+{
+	int s;
+
+	s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+	if (_s != NULL) {
+		*_s = s;
+	}
+
+	if (s < 0) {
+		return -1;
+	}
+
+	return 0;
+}
+
+static void test_max_sockets(void **state)
+{
+	int rc;
+	int s[MAX_SOCKETS+1] = { 0 };
+	int i;
+
+	(void) state; /* unused */
+
+	for (i = 0; i < MAX_SOCKETS; i++) {
+		rc = _socket(&s[i]);
+		assert_return_code(rc, errno);
+	}
+
+	/* no free space for sockets left */
+	rc = _socket(&s[MAX_SOCKETS]);
+	assert_int_equal(rc, -1);
+	assert_int_equal(errno, ENOMEM);
+
+	/* closing a socket frees up space */
+	close(s[0]);
+	rc = _socket(&s[0]);
+	assert_return_code(rc, errno);
+
+	/* but just one */
+	rc = _socket(&s[MAX_SOCKETS]);
+	assert_int_equal(rc, -1);
+	assert_int_equal(errno, ENOMEM);
+
+	for (i = 0; i < MAX_SOCKETS; i++) {
+		close(s[i]);
+	}
+}
+
+int main(void) {
+	int rc;
+
+	const struct CMUnitTest max_sockets_tests[] = {
+		cmocka_unit_test_setup_teardown(test_max_sockets,
+						setup, teardown),
+	};
+
+	rc = cmocka_run_group_tests(max_sockets_tests, NULL, NULL);
+
+	return rc;
+}