From fba84f08b854b61ac65e44d2269667847fd10bcd Mon Sep 17 00:00:00 2001
From: Ingo Weinhold <ingo_weinhold@gmx.de>
Date: Mon, 19 Apr 2010 20:15:32 +0000
Subject: [PATCH] Small test program that shows Haiku doesn't deal correctly
 with resizing mmap()ed files. Also reproduces #5473.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36359 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/tests/system/kernel/Jamfile              |  2 +
 src/tests/system/kernel/mmap_resize_test.cpp | 61 ++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 src/tests/system/kernel/mmap_resize_test.cpp

diff --git a/src/tests/system/kernel/Jamfile b/src/tests/system/kernel/Jamfile
index 3e50fc40aa..545e4c38f7 100644
--- a/src/tests/system/kernel/Jamfile
+++ b/src/tests/system/kernel/Jamfile
@@ -47,6 +47,8 @@ SimpleTest port_wakeup_test_7 : port_wakeup_test_7.cpp ;
 SimpleTest port_wakeup_test_8 : port_wakeup_test_8.cpp ;
 SimpleTest port_wakeup_test_9 : port_wakeup_test_9.cpp ;
 
+SimpleTest mmap_resize_test : mmap_resize_test.cpp ;
+
 SimpleTest reserved_areas_test : reserved_areas_test.cpp ;
 
 SimpleTest select_check : select_check.cpp ;
diff --git a/src/tests/system/kernel/mmap_resize_test.cpp b/src/tests/system/kernel/mmap_resize_test.cpp
new file mode 100644
index 0000000000..965cb93c72
--- /dev/null
+++ b/src/tests/system/kernel/mmap_resize_test.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+
+int
+main()
+{
+	const char* fileName = "/tmp/mmap-resize-test-file";
+
+	// create file
+	printf("creating file...\n");
+	int fd = open(fileName, O_CREAT | O_RDWR | O_TRUNC, 0644);
+	if (fd < 0) {
+		fprintf(stderr, "Failed to open \"%s\": %s\n", fileName,
+			strerror(errno));
+		exit(1);
+	}
+
+	// write half a page
+	printf("writing data to file...\n");
+	char buffer[2048];
+	memset(buffer, 0xdd, sizeof(buffer));
+	if (write(fd, buffer, sizeof(buffer)) != (ssize_t)sizeof(buffer)) {
+		fprintf(stderr, "Failed to write to file!\n");
+		exit(1);
+	}
+
+	// map the page
+	printf("mapping file...\n");
+	void* address = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (address == MAP_FAILED) {
+		fprintf(stderr, "Failed to map the file: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	// truncate the file
+	printf("truncating file...\n");
+	if (ftruncate(fd, 0) < 0) {
+		fprintf(stderr, "Failed to truncate the file: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	// touch data
+	printf("touching no longer mapped data (should fail with SIGBUS)...\n");
+	*(int*)address = 42;
+
+	printf("Shouldn't get here!!!\n");
+
+	return 0;
+}