ceph/src/test/test_cfuse_cache_invalidate.cc

   1
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <sys/types.h>
   6 #include <sys/wait.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <assert.h>
  11
  12 #define REGION 1048576
  13 int main(int argc, char *argv[]) {
  14
  15   pid_t p = fork();
  16   char buf[REGION];
  17   memset(buf, 0, sizeof(buf));
  18
  19   if (p != 0) {
  20     int done = 0;
  21     int fd = open(argv[1], O_RDWR|O_CREAT, 0644);
  22     if (fd < 0) {
  23       perror(argv[1]);
  24       return 1;
  25     }
  26
  27     int i = 0;
  28     while(!done) {
  29       printf("writing %d\n", i++);
  30       assert(pwrite(fd, buf, REGION, 0) == REGION);
  31       int status;
  32       int ret = waitpid(p, &status, WNOHANG);
  33       assert(ret >= 0);
  34       if (ret > 0) {
  35         done = 1;
  36       }
  37     }
  38     close(fd);
  39   } else {
  40     sleep(1);
  41     int fd = open(argv[2], O_RDONLY, 0644);
  42     if (fd < 0) {
  43       perror(argv[2]);
  44       return 1;
  45     }
  46
  47     printf("reading\n");
  48     assert(pread(fd, buf, REGION, 0) == REGION);
  49     close(fd);
  50   }
  51
  52   return 0;
  53 }