1 files changed, 67 insertions, 0 deletions
diff --git a/src/util/fifo_open.c b/src/util/fifo_open.c
new file mode 100644
index 0000000..1587779
--- /dev/null
+++ b/src/util/fifo_open.c
@@ -0,0 +1,67 @@
+/*++
+/* NAME
+/*	fifo_open 1
+/* SUMMARY
+/*	fifo client test program
+/* SYNOPSIS
+/*	fifo_open
+/* DESCRIPTION
+/*	fifo_open creates a FIFO, then attempts to open it for writing
+/*	with non-blocking mode enabled. According to the POSIX standard
+/*	the open should succeed.
+/* DIAGNOSTICS
+/*	Problems are reported to the standard error stream.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#define FIFO_PATH	"test-fifo"
+#define perrorexit(s)	{ perror(s); exit(1); }
+
+static void cleanup(void)
+{
+    printf("Removing fifo %s...\n", FIFO_PATH);
+    if (unlink(FIFO_PATH))
+	perrorexit("unlink");
+    printf("Done.\n");
+}
+
+static void stuck(int unused_sig)
+{
+    printf("Non-blocking, write-only open of FIFO blocked\n");
+    cleanup();
+    exit(1);
+}
+
+int     main(int unused_argc, char **unused_argv)
+{
+    (void) unlink(FIFO_PATH);
+    printf("Creating fifo %s...\n", FIFO_PATH);
+    if (mkfifo(FIFO_PATH, 0600) < 0)
+	perrorexit("mkfifo");
+    signal(SIGALRM, stuck);
+    alarm(5);
+    printf("Opening fifo %s, non-blocking, write-only mode...\n", FIFO_PATH);
+    if (open(FIFO_PATH, O_WRONLY | O_NONBLOCK, 0) < 0) {
+	perror("open");
+	cleanup();
+	exit(1);
+    }
+    printf("Non-blocking, write-only open of FIFO succeeded\n");
+    cleanup();
+    exit(0);
+}