1 /* $NetBSD: fifo_open.c,v 1.1.1.1 2009/06/23 10:08:59 tron Exp $ */
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
cleanup(void)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
stuck(int unused_sig)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
main(int unused_argc,char ** unused_argv)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 }
70