zdtm: add new test case for testing shared memory

* map a big memory region
* fork
* unmap the first and tenth pages
* remap one page in another place
* touch a few pages
* check content of touched pages
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -36,6 +36,7 @@ TST_NOFILE	=				\
 		ipc_namespace			\
 		selfexe00			\
 		sem				\
+		maps01				\
 #		jobctl00			\
 
 TST_FILE	=				\

test/zdtm/live/static/maps01.c

+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <linux/limits.h>
+#include "zdtmtst.h"
+
+#define PAGE_SIZE 4096
+#define MEM_SIZE (1L << 30)
+#define MEM_OFFSET (1L << 29)
+#define MEM_OFFSET2 (MEM_SIZE - PAGE_SIZE)
+#define MEM_OFFSET3 (20 * PAGE_SIZE)
+
+const char *test_doc	= "Test shared memory";
+const char *test_author	= "Andrew Vagin <avagin@openvz.org";
+
+int main(int argc, char ** argv)
+{
+	void *m, *m2;
+	char path[PATH_MAX];
+	uint32_t crc;
+	pid_t pid = -1;
+	int status, fd;
+
+	test_init(argc, argv);
+
+	m = mmap(NULL, MEM_SIZE, PROT_WRITE | PROT_READ,
+				MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+
+	if (m == MAP_FAILED)
+		goto err;
+
+	pid = test_fork();
+	if (pid < 0) {
+		goto err;
+	} else if (pid == 0) {
+		crc = ~0;
+		datagen(m + MEM_OFFSET, PAGE_SIZE, &crc);
+		crc = ~0;
+		datagen(m + MEM_OFFSET2, PAGE_SIZE, &crc);
+
+		test_waitsig();
+
+		crc = ~0;
+		status = datachk(m + MEM_OFFSET, PAGE_SIZE, &crc);
+		if (status)
+			return 1;
+		crc = ~0;
+		status = datachk(m + MEM_OFFSET2, PAGE_SIZE, &crc);
+		if (status)
+			return 1;
+		crc = ~0;
+		status = datachk(m + PAGE_SIZE, PAGE_SIZE, &crc);
+		if (status)
+			return 1;
+		return 0;
+	}
+
+	snprintf(path, PATH_MAX, "/proc/self/map_files/%lx-%lx",
+						(unsigned long) m,
+						(unsigned long) m + MEM_SIZE);
+	fd = open(path, O_RDWR);
+	if (fd == -1) {
+		err("Can't open file %s: %m", path);
+		goto err;
+	}
+
+	m2 = mmap(NULL, PAGE_SIZE, PROT_WRITE | PROT_READ, MAP_SHARED, fd, MEM_OFFSET3);
+	if (m2 == MAP_FAILED) {
+		err("Can't map file %s", path);
+		goto err;
+	}
+	close(fd);
+
+	munmap(m, PAGE_SIZE);
+	munmap(m + PAGE_SIZE * 10, PAGE_SIZE);
+	munmap(m + MEM_OFFSET2, PAGE_SIZE);
+
+	crc = ~0;
+	datagen(m + PAGE_SIZE, PAGE_SIZE, &crc);
+
+	crc = ~0;
+	datagen(m2, PAGE_SIZE, &crc);
+
+	test_daemon();
+	test_waitsig();
+
+	kill(pid, SIGTERM);
+	wait(&status);
+	if (WIFEXITED(status)) {
+		if (WEXITSTATUS(status))
+			goto err;
+	} else
+		goto err;
+
+	crc = ~0;
+	if (datachk(m + MEM_OFFSET, PAGE_SIZE, &crc))
+		goto err;
+
+	crc = ~0;
+	if (datachk(m2, PAGE_SIZE, &crc))
+		goto err;
+
+	pass();
+
+	return 0;
+err:
+	if (waitpid(-1, NULL, WNOHANG) == 0) {
+		kill(pid, SIGTERM);
+		wait(NULL);
+	}
+	return 1;
+}