test:libcriu: add cr_errno test

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/libcriu/Makefile

@@ -2,6 +2,7 @@ TESTS += test_sub
 TESTS += test_self
 TESTS += test_notify
 TESTS += test_iters
+TESTS += test_errno
 
 all: $(TESTS)
 

test/libcriu/run.sh

@@ -39,6 +39,7 @@ run_test test_sub
 run_test test_self
 run_test test_notify
 run_test test_iters
+run_test test_errno
 
 echo "== Stopping service"
 kill -TERM $(cat wdir/s/pidfile)

test/libcriu/test_errno.c

@@ -0,0 +1,152 @@
+#include "criu.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+
+#define PID_MAX "/proc/sys/kernel/pid_max"
+
+static int dir_fd;
+static char *service;
+
+static int init(char *argv[])
+{
+	service = argv[1];
+
+	dir_fd = open(argv[2], O_DIRECTORY);
+	if (dir_fd < 0) {
+		perror("Can't open images dir");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void get_base_req(void)
+{
+	criu_init_opts();
+	criu_set_service_address(service);
+	criu_set_images_dir_fd(dir_fd);
+	criu_set_log_level(4);
+}
+
+static int check_resp(int ret, int expected_ret, int err, int expected_err)
+{
+	if (ret != expected_ret) {
+		fprintf(stderr, "Unexpected ret %d (%d expected)\n", ret, expected_ret);
+		return -1;
+	}
+
+	if (err != expected_err) {
+		fprintf(stderr, "Unexpected errno %d (%d expected)\n", err, expected_err);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int no_process(void)
+{
+	FILE *f = NULL;
+	size_t len;
+	ssize_t count;
+	char *buf = NULL;
+	int pid, fd, ret;
+
+	printf("--- Try to dump unexisting process\n");
+
+	f = fopen(PID_MAX, "r");
+	if (!f) {
+		perror("Can't open " PID_MAX);
+		goto err;
+	}
+
+	count = getline(&buf, &len, f);
+	if (count == -1) {
+		perror("Can't read " PID_MAX);
+		goto err;
+	}
+	pid = atoi(buf);
+
+	if (!kill(pid, 0)) {
+		fprintf(stderr, "max pid is taken\n");
+		goto err;
+	}
+
+	get_base_req();
+	criu_set_pid(pid);
+	ret = criu_dump();
+	if (check_resp(ret, -EBADE, errno, ESRCH))
+		goto err;
+
+	printf("   `- Success\n");
+	return 0;
+err:
+	if (f)
+		fclose(f);
+	return -1;
+
+}
+
+static int process_exists(void)
+{
+	int ret;
+
+	printf("--- Try to restore process which pid is already taken by other process\n");
+
+	get_base_req();
+	criu_set_shell_job(true);
+	criu_set_leave_running(true);
+	if (criu_dump()) {
+		fprintf(stderr, "Self-dump failed");
+		goto err;
+	}
+
+	get_base_req();
+	ret = criu_restore();
+	if (check_resp(ret, -EBADE, errno, EEXIST))
+		goto err;
+
+	printf("   `- Success\n");
+	return 0;
+err:
+	return -1;
+}
+
+static int bad_options(void)
+{
+	int ret;
+
+	printf("--- Try to send criu invalid opts\n");
+
+	get_base_req();
+	criu_set_log_file("../file.log");
+	ret = criu_dump();
+	if (check_resp(ret, -EBADE, errno, EBADRQC))
+		goto err;
+
+	printf("   `- Success\n");
+	return 0;
+err:
+	return -1;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret = 1;
+
+	if (init(argv))
+		goto out;
+
+	if (no_process() || process_exists() || bad_options())
+		goto out;
+
+	ret = 0;
+out:
+	if (dir_fd)
+		close(dir_fd);
+
+	return ret;
+}