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