Subversion Repositories scarts

#include <stdlib.h>

#include <stdio.h>

#include <fcntl.h>

#include <ffi.h>

#include "fficonfig.h"

#define MAX_ARGS 256

#define CHECK(x) (!(x) ? abort() : (void)0)

/* Prefer MAP_ANON(YMOUS) to /dev/zero, since we don't need to keep a

   file open.  */

#ifdef HAVE_MMAP_ANON

# undef HAVE_MMAP_DEV_ZERO

# include <sys/mman.h>

# ifndef MAP_FAILED

#  define MAP_FAILED -1

# endif

# if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)

#  define MAP_ANONYMOUS MAP_ANON

# endif

# define USING_MMAP

#endif

#ifdef HAVE_MMAP_DEV_ZERO

# include <sys/mman.h>

# ifndef MAP_FAILED

#  define MAP_FAILED -1

# endif

# define USING_MMAP

#endif

#ifdef USING_MMAP

static inline void *

allocate_mmap (size_t size)

{

  void *page;

#if defined (HAVE_MMAP_DEV_ZERO)

  static int dev_zero_fd = -1;

#endif

#ifdef HAVE_MMAP_DEV_ZERO

  if (dev_zero_fd == -1)

    {

      dev_zero_fd = open ("/dev/zero", O_RDONLY);

      if (dev_zero_fd == -1)

        {

          perror ("open /dev/zero: %m");

          exit (1);

        }

    }

#endif

#ifdef HAVE_MMAP_ANON

  page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,

               MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

#endif

#ifdef HAVE_MMAP_DEV_ZERO

  page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,

               MAP_PRIVATE, dev_zero_fd, 0);

#endif

  if (page == MAP_FAILED)

    {

      perror ("virtual memory exhausted");

      exit (1);

    }

  return page;

}

#endif