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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/util/fifo_open.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/fifo_open.c')
-rw-r--r--src/util/fifo_open.c67
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);
+}