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#include <stdio.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void generate_test_file(int count)
{
FILE *f;
int i;
f = fopen("testfile", "w+");
for (i=0;i<count;i++) {
fwrite(&i, 1, sizeof(i), f);
}
fclose(f);
}
void test_mmap_directly()
{
int fd;
void *area_short, *area_long;
generate_test_file(1024);
fd = open("testfile", O_RDONLY);
assert(fd>=0);
area_short = mmap(0, 4096, PROT_READ, MAP_PRIVATE, fd, 0);
assert(area_short != MAP_FAILED);
close(fd);
generate_test_file(1024*1024);
fd = open("testfile", O_RDONLY);
assert(fd>=0);
area_long = mmap(area_short, 4096*1024, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, 0);
assert(area_long != MAP_FAILED);
assert(area_short == area_long);
}
int main(int argc, char ** argv)
{
test_mmap_directly();
/* Crashes on shutdown for libc 2.5 and kernel 2.6.18 (CentOS 5) */
}
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