lib/replace/tests/shared_mremap.c

   1 /* this tests whether we can use mremap */
   2
   3 #if defined(HAVE_UNISTD_H)
   4 #include <unistd.h>
   5 #endif
   6 #ifdef HAVE_STDLIB_H
   7 #include <stdlib.h>
   8 #endif
   9 #include <sys/mman.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13
  14 #define DATA "conftest.mmap"
  15
  16 #ifndef MAP_FILE
  17 #define MAP_FILE 0
  18 #endif
  19
  20 #ifndef MAP_FAILED
  21 #define MAP_FAILED (int *)-1
  22 #endif
  23
  24 int main(void)
  25 {
  26         int *buf;
  27         int fd;
  28         int err = 1;
  29
  30         fd = open(DATA, O_RDWR|O_CREAT|O_TRUNC, 0666);
  31         if (fd == -1) {
  32                 exit(1);
  33         }
  34
  35         buf = (int *)mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
  36                           MAP_FILE | MAP_SHARED, fd, 0);
  37         if (buf == MAP_FAILED) {
  38                 goto done;
  39         }
  40
  41         buf = mremap(buf, 0x1000, 0x2000, MREMAP_MAYMOVE);
  42         if (buf == MAP_FAILED) {
  43                 goto done;
  44         }
  45
  46         err = 0;
  47 done:
  48         close(fd);
  49         unlink(DATA);
  50         exit(err);
  51 }