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
  11 #include "include/ceph_assert.h"
  12
  13 #define REGION 1048576
  14 int main(int argc, char *argv[]) {
  15
  16   pid_t p = fork();
  17   char buf[REGION];
  18   memset(buf, 0, sizeof(buf));
  19
  20   if (p != 0) {
  21     int done = 0;
  22     int fd = open(argv[1], O_RDWR|O_CREAT, 0644);
  23     if (fd < 0) {
  24       perror(argv[1]);
  25       return 1;
  26     }
  27
  28     int i = 0;
  29     while(!done) {
  30       printf("writing %d\n", i++);
  31       ceph_assert(pwrite(fd, buf, REGION, 0) == REGION);
  32       int status;
  33       int ret = waitpid(p, &status, WNOHANG);
  34       ceph_assert(ret >= 0);
  35       if (ret > 0) {
  36         done = 1;
  37       }
  38     }
  39     close(fd);
  40   } else {
  41     sleep(1);
  42     int fd = open(argv[2], O_RDONLY, 0644);
  43     if (fd < 0) {
  44       perror(argv[2]);
  45       return 1;
  46     }
  47
  48     printf("reading\n");
  49     ceph_assert(pread(fd, buf, REGION, 0) == REGION);
  50     close(fd);
  51   }
  52
  53   return 0;
  54 }