10 /* Define __UNUSED__ that also other compilers than gcc can run the tests. */
13 #define __UNUSED__ __attribute__((__unused__))
18 #define CHECK(x) (!(x) ? abort() : (void)0)
20 /* Prefer MAP_ANON(YMOUS) to /dev/zero, since we don't need to keep a
23 # undef HAVE_MMAP_DEV_ZERO
25 # include <sys/mman.h>
27 # define MAP_FAILED -1
29 # if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)
30 # define MAP_ANONYMOUS MAP_ANON
36 #ifdef HAVE_MMAP_DEV_ZERO
38 # include <sys/mman.h>
40 # define MAP_FAILED -1
48 allocate_mmap (size_t size)
51 #if defined (HAVE_MMAP_DEV_ZERO)
52 static int dev_zero_fd = -1;
55 #ifdef HAVE_MMAP_DEV_ZERO
56 if (dev_zero_fd == -1)
58 dev_zero_fd = open ("/dev/zero", O_RDONLY);
59 if (dev_zero_fd == -1)
61 perror ("open /dev/zero: %m");
69 page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
70 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
72 #ifdef HAVE_MMAP_DEV_ZERO
73 page = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
74 MAP_PRIVATE, dev_zero_fd, 0);
77 if (page == MAP_FAILED)
79 perror ("virtual memory exhausted");