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#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
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