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Small test program that shows Haiku doesn't deal correctly with resizing

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mmap()ed files. Also reproduces #5473.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36359 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-04-19 20:15:32 +00:00
parent 17aad616d2
commit fba84f08b8
2 changed files with 63 additions and 0 deletions
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2
src/tests/system/kernel/Jamfile
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@ -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 ;

61
src/tests/system/kernel/mmap_resize_test.cpp Normal file
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@ -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;
}