tools/regression/nfsmmap/test1/test1.c

   1 #include <sys/types.h>
   2 #include <sys/fcntl.h>
   3 #include <sys/mman.h>
   4 #include <unistd.h>
   5
   6 int main(int argc, char** argv)
   7 {
   8     int fd, fd2;
   9     caddr_t addr;
  10     char zeros[4096];
  11     char ones[200];
  12
  13     memset(zeros, 0, sizeof zeros);
  14     memset(ones, 1, sizeof ones);
  15 #if 0
  16     unlink("test1.data");
  17     fd = open("test1.data", O_RDWR|O_CREAT, 0666);
  18     if (fd < 0)
  19         err(1, "creating file");
  20     if (write(fd, zeros, sizeof zeros) < 0)
  21         err(1, "writing zeros");
  22     close(fd);
  23 #endif
  24
  25     fd = open("test1.data", O_RDWR);
  26     if (fd < 0)
  27         err(1, "opening file");
  28     if (lseek(fd, 600, SEEK_SET) < 0)
  29         err(1, "seeking");
  30
  31     if (write(fd, ones, sizeof ones) < 0)
  32         err(1, "writing ones");
  33
  34     fsync(fd);
  35
  36     addr = mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
  37     if (addr == MAP_FAILED)
  38         err(1, "mapping");
  39     unlink("test1.scratch");
  40     fd2 = open("test1.scratch", O_RDWR|O_CREAT, 0666);
  41     if (fd2 < 0)
  42         err(1, "creating scratch");
  43
  44     if (write(fd2, addr, 4096) < 0)
  45         err(1, "writing scratch");
  46 }