1#include <stdlib.h>
2#include <stdio.h>
3#include <fcntl.h>
4#include <ffi.h>
5#include "fficonfig.h"
6
7#define MAX_ARGS 256
8
9#define CHECK(x) (!(x) ? abort() : (void)0)
10
11/* Prefer MAP_ANON(YMOUS) to /dev/zero, since we don't need to keep a
12   file open.  */
13#ifdef HAVE_MMAP_ANON
14# undef HAVE_MMAP_DEV_ZERO
15
16# include <sys/mman.h>
17# ifndef MAP_FAILED
18#  define MAP_FAILED -1
19# endif
20# if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)
21#  define MAP_ANONYMOUS MAP_ANON
22# endif
23# define USING_MMAP
24
25#endif
26
27#ifdef HAVE_MMAP_DEV_ZERO
28
29# include <sys/mman.h>
30# ifndef MAP_FAILED
31#  define MAP_FAILED -1
32# endif
33# define USING_MMAP
34
35#endif
36
37#ifdef USING_MMAP
38static inline void *
39allocate_mmap (size_t size)
40{
41  void *page;
42#if defined (HAVE_MMAP_DEV_ZERO)
43  static int dev_zero_fd = -1;
44#endif
45
46#ifdef HAVE_MMAP_DEV_ZERO
47  if (dev_zero_fd == -1)
48    {
49      dev_zero_fd = open ("/dev/zero", O_RDONLY);
50      if (dev_zero_fd == -1)
51	{
52	  perror ("open /dev/zero: %m");
53	  exit (1);
54	}
55    }
56#endif
57
58
59#ifdef HAVE_MMAP_ANON
60  page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
61	       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
62#endif
63#ifdef HAVE_MMAP_DEV_ZERO
64  page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
65	       MAP_PRIVATE, dev_zero_fd, 0);
66#endif
67
68  if (page == MAP_FAILED)
69    {
70      perror ("virtual memory exhausted");
71      exit (1);
72    }
73
74  return page;
75}
76
77#endif
78