listati/FortuneClient.c

   1 int main(int argc, char *argv[])
   2 {
   3 /* Variables definition */
   4     int n = 0;
   5     char *fortunefilename = "/tmp/fortune.fifo";
   6     char line[80];
   7     int fifo_server, fifo_client;
   8     char fifoname[80];
   9     int nread;
  10     char buffer[PIPE_BUF];
  11     ...
  12     snprintf(fifoname, 80, "/tmp/fortune.%d", getpid());     /* compose name */
  13     if (mkfifo(fifoname, 0622)) {                        /* open client fifo */
  14         if (errno!=EEXIST) {
  15             perror("Cannot create well known fifo");
  16             exit(-1);
  17         }
  18     }
  19     fifo_server = open(fortunefilename, O_WRONLY);       /* open server fifo */
  20     if (fifo_server < 0) {
  21         perror("Cannot open well known fifo");
  22         exit(-1);
  23     }
  24     nread = write(fifo_server, fifoname, strlen(fifoname)+1);  /* write name */
  25     close(fifo_server);                                 /* close server fifo */
  26     fifo_client = open(fifoname, O_RDONLY);              /* open client fifo */
  27     if (fifo_client < 0) {
  28         perror("Cannot open well known fifo");
  29         exit(-1);
  30     }
  31     nread = read(fifo_client, buffer, sizeof(buffer));        /* read answer */
  32     printf("%s", buffer);                                   /* print fortune */
  33     close(fifo_client);                                      /* close client */
  34     close(fifo_server);                                      /* close server */
  35     unlink(fifoname);                                  /* remove client fifo */
  36 }