File: mmap1.c

package info (click to toggle)
gdb-doc 13.1-1
  • links: PTS, VCS
  • area: non-free
  • in suites: bookworm
  • size: 234,284 kB
  • sloc: ansic: 1,988,072; asm: 373,465; exp: 187,579; cpp: 75,697; makefile: 69,432; sh: 24,829; yacc: 11,654; python: 9,602; ada: 6,680; xml: 6,073; perl: 5,077; pascal: 3,357; f90: 2,555; tcl: 1,902; lisp: 1,578; cs: 879; lex: 759; sed: 228; awk: 154; objc: 137; fortran: 57
file content (52 lines) | stat: -rw-r--r-- 883 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
/*
#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;
  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 = sb.st_size;

  /* We want to test mmapping a size that isn't exactly a page.  */
  if ((size & 8191) == 0)
    size--;

#ifndef MMAP_FLAGS
#define MMAP_FLAGS MAP_PRIVATE
#endif

  a = mmap (NULL, size, PROT_READ, MMAP_FLAGS, fd, 0);

  if (memmem (a, size, str, strlen (str) + 1) == NULL)
    abort ();

  printf ("pass\n");
  exit (0);
}