test/t68b.c

   1 #include <sys/types.h>
   2 #include <sys/wait.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8
   9 int
  10 main(int argc, char *argv[])
  11 {
  12         int fd, fd_parent;
  13         char buf[1];
  14
  15         if (argc != 2) {
  16                 return 1;
  17         }
  18
  19         fd_parent = atoi(argv[1]);
  20
  21         /* Writing to fd_parent should fail as it has to be closed at this
  22          * point */
  23         if (write(fd_parent, buf, sizeof(buf)) != -1) {
  24                 return 2;
  25         }
  26         if (errno != EBADF) {
  27                 return 3;
  28         }
  29
  30         /* If we open a new file, the fd we obtain should be identical to
  31          * fd_parent */
  32         fd = open("open_identical_fd", O_CREAT|O_RDWR, 0660);
  33         if (fd != fd_parent) {
  34                 return 4;
  35         }
  36
  37         return 0;
  38 }
  39