test/mmap/mmap.c

   1
   2 /* The mmap test is useful, since syscalls with 6 arguments
   3  * (as mmap) are done differently on various architectures.
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <errno.h>
  10 #include <unistd.h>
  11 #include <sys/mman.h>
  12
  13 #define SIZEOF_ARRAY(type) (sizeof(type)/sizeof(*type))
  14
  15 struct mmap_test {
  16         void *ret;
  17         int err;
  18         struct {
  19                 void *start;
  20                 size_t length;
  21                 int prot;
  22                 int flags;
  23                 int fd;
  24                 off_t offset;
  25         } args;
  26 };
  27
  28 struct mmap_test tests[] = {
  29         [0] {
  30                 .err = 0,
  31                 .args.start = NULL,
  32                 .args.length = 4096,
  33                 .args.prot = PROT_READ|PROT_WRITE,
  34                 .args.flags = MAP_PRIVATE|MAP_ANONYMOUS,
  35                 .args.fd = 0,
  36                 .args.offset = 0
  37         },
  38 };
  39
  40 #define err(fmt, args...) \
  41         do { \
  42                 fprintf(stderr, fmt "\n" , ## args); \
  43                 exit(1); \
  44         } while (0)
  45 #define errp(fmt, args...) err(fmt ": %s" , ## args , strerror(errno))
  46
  47 int main(int argc, char **argv)
  48 {
  49         int i;
  50         struct mmap_test *t;
  51
  52         for (i=0; i<SIZEOF_ARRAY(tests); ++i) {
  53                 t = tests + i;
  54
  55                 errno = 0;
  56                 t->ret = mmap(t->args.start, t->args.length, t->args.prot,
  57                               t->args.flags, t->args.fd, t->args.offset);
  58
  59                 if (t->err) {
  60                         if (t->ret != MAP_FAILED)
  61                                 err("mmap test %i should have failed, but gave us %p", i, t->ret);
  62                         else if (t->err != errno)
  63                                 errp("mmap test %i failed, but gave us wrong errno (got %i instead of %i)", i, errno, t->err);
  64                 } else {
  65                         if (t->ret == MAP_FAILED)
  66                                 errp("mmap test %i failed", i);
  67                         else if (munmap(t->ret, t->args.length) != 0)
  68                                 errp("munmap test %i failed", i);
  69                 }
  70         }
  71
  72         exit(0);
  73 }