external/ibm-public/postfix/dist/src/util/fifo_open.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      fifo_open 1
   6 /* SUMMARY
   7 /*      fifo client test program
   8 /* SYNOPSIS
   9 /*      fifo_open
  10 /* DESCRIPTION
  11 /*      fifo_open creates a FIFO, then attempts to open it for writing
  12 /*      with non-blocking mode enabled. According to the POSIX standard
  13 /*      the open should succeed.
  14 /* DIAGNOSTICS
  15 /*      Problems are reported to the standard error stream.
  16 /* LICENSE
  17 /* .ad
  18 /* .fi
  19 /*      The Secure Mailer license must be distributed with this software.
  20 /* AUTHOR(S)
  21 /*      Wietse Venema
  22 /*      IBM T.J. Watson Research
  23 /*      P.O. Box 704
  24 /*      Yorktown Heights, NY 10598, USA
  25 /*--*/
  26
  27 #include <sys/stat.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <signal.h>
  31 #include <unistd.h>
  32 #include <stdlib.h>
  33
  34 #define FIFO_PATH       "test-fifo"
  35 #define perrorexit(s)   { perror(s); exit(1); }
  36
  37 static void cleanup(void)
  38 {
  39     printf("Removing fifo %s...\n", FIFO_PATH);
  40     if (unlink(FIFO_PATH))
  41         perrorexit("unlink");
  42     printf("Done.\n");
  43 }
  44
  45 static void stuck(int unused_sig)
  46 {
  47     printf("Non-blocking, write-only open of FIFO blocked\n");
  48     cleanup();
  49     exit(1);
  50 }
  51
  52 int     main(int unused_argc, char **unused_argv)
  53 {
  54     (void) unlink(FIFO_PATH);
  55     printf("Creating fifo %s...\n", FIFO_PATH);
  56     if (mkfifo(FIFO_PATH, 0600) < 0)
  57         perrorexit("mkfifo");
  58     signal(SIGALRM, stuck);
  59     alarm(5);
  60     printf("Opening fifo %s, non-blocking, write-only mode...\n", FIFO_PATH);
  61     if (open(FIFO_PATH, O_WRONLY | O_NONBLOCK, 0) < 0) {
  62         perror("open");
  63         cleanup();
  64         exit(1);
  65     }
  66     printf("Non-blocking, write-only open of FIFO succeeded\n");
  67     cleanup();
  68     exit(0);
  69 }