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/*
#progos: linux
*/
#define _GNU_SOURCE
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
int main (int argc, char *argv[])
{
int fd = open (argv[0], O_RDONLY);
struct stat sb;
int size;
void *a;
void *b;
const char *str = "a string you'll only find in the program";
if (fd == -1)
{
perror ("open");
abort ();
}
if (fstat (fd, &sb) < 0)
{
perror ("fstat");
abort ();
}
size = 8192;
#ifdef MMAP_SIZE1
size = MMAP_SIZE1;
#endif
#ifndef MMAP_PROT1
#define MMAP_PROT1 PROT_READ | PROT_WRITE | PROT_EXEC
#endif
#ifndef MMAP_FLAGS1
#define MMAP_FLAGS1 MAP_PRIVATE | MAP_ANONYMOUS
#endif
/* Get a page, any page. */
b = mmap (NULL, size, MMAP_PROT1, MMAP_FLAGS1, -1, 0);
if (b == MAP_FAILED)
abort ();
/* Remember it, unmap it. */
#ifndef NO_MUNMAP
if (munmap (b, size) != 0)
abort ();
#endif
#ifdef MMAP_ADDR2
b = MMAP_ADDR2;
#endif
#ifndef MMAP_PROT2
#define MMAP_PROT2 PROT_READ | PROT_EXEC
#endif
#ifndef MMAP_FLAGS2
#define MMAP_FLAGS2 MAP_DENYWRITE | MAP_FIXED | MAP_PRIVATE
#endif
size = sb.st_size;
#ifdef MMAP_SIZE2
size = MMAP_SIZE2;
#endif
#define MMAP_TEST_BAD_ORIG \
(a == MAP_FAILED || memmem (a, size, str, strlen (str) + 1) == NULL)
#ifndef MMAP_TEST_BAD
#define MMAP_TEST_BAD MMAP_TEST_BAD_ORIG
#endif
/* Try mapping the now non-mapped page fixed. */
a = mmap (b, size, MMAP_PROT2, MMAP_FLAGS2, fd, 0);
if (MMAP_TEST_BAD)
abort ();
printf ("pass\n");
exit (0);
}
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