test/t68a.c

   1 #include <sys/types.h>
   2 #include <sys/wait.h>
   3 #include <fcntl.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 int
   9 main(int argc, char *argv[])
  10 {
  11         int fd, fd_parent;
  12         char buf[1];
  13
  14         if (argc != 2) {
  15                 return 1;
  16         }
  17
  18         fd_parent = atoi(argv[1]);
  19
  20         /* If we open a new file, the fd we obtain should be fd_parent + 1 */
  21         fd = open("open_plusplus_fd", O_CREAT|O_RDWR, 0660);
  22         if (fd != fd_parent + 1) {
  23                 return 2;
  24         }
  25
  26         /* Also, writing to fd_parent should succeed */
  27         if (write(fd_parent, buf, sizeof(buf)) <= 0) {
  28                 return 3;
  29         }
  30
  31         return 0;
  32 }
  33