1#include <stdlib.h> 2#include <stdio.h> 3#include <string.h> 4#include <fcntl.h> 5#include <ffi.h> 6#include <fficonfig.h> 7 8#define MAX_ARGS 256 9 10#define CHECK(x) !(x) ? abort() : 0 11 12 13/* Prefer MAP_ANON(YMOUS) to /dev/zero, since we don't need to keep a 14 file open. */ 15#ifdef HAVE_MMAP_ANON 16# undef HAVE_MMAP_DEV_ZERO 17 18# include <sys/mman.h> 19# ifndef MAP_FAILED 20# define MAP_FAILED -1 21# endif 22# if !defined (MAP_ANONYMOUS) && defined (MAP_ANON) 23# define MAP_ANONYMOUS MAP_ANON 24# endif 25# define USING_MMAP 26 27#endif 28 29#ifdef HAVE_MMAP_DEV_ZERO 30 31# include <sys/mman.h> 32# ifndef MAP_FAILED 33# define MAP_FAILED -1 34# endif 35# define USING_MMAP 36 37#endif 38 39#ifdef USING_MMAP 40static inline void * 41allocate_mmap (size_t size) 42{ 43 void *page; 44#if defined (HAVE_MMAP_DEV_ZERO) 45 static int dev_zero_fd = -1; 46#endif 47 48#ifdef HAVE_MMAP_DEV_ZERO 49 if (dev_zero_fd == -1) 50 { 51 dev_zero_fd = open ("/dev/zero", O_RDONLY); 52 if (dev_zero_fd == -1) 53 { 54 perror ("open /dev/zero: %m"); 55 exit (1); 56 } 57 } 58#endif 59 60 61#ifdef HAVE_MMAP_ANON 62 page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, 63 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 64#endif 65#ifdef HAVE_MMAP_DEV_ZERO 66 page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, 67 MAP_PRIVATE, dev_zero_fd, 0); 68#endif 69 70 if (page == (void *) MAP_FAILED) 71 { 72 perror ("virtual memory exhausted"); 73 exit (1); 74 } 75 76 return page; 77} 78 79#endif 80