From b5896ba9f6047e7031e2bdee0622d543e11a6734 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:46:30 +0200
Subject: Adding upstream version 3.4.23.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/util/fifo_rdonly_bug.c | 127 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/util/fifo_rdonly_bug.c

(limited to 'src/util/fifo_rdonly_bug.c')

diff --git a/src/util/fifo_rdonly_bug.c b/src/util/fifo_rdonly_bug.c
new file mode 100644
index 0000000..bf93467
--- /dev/null
+++ b/src/util/fifo_rdonly_bug.c
@@ -0,0 +1,127 @@
+/*++
+/* NAME
+/*	fifo_rdonly_bug 1
+/* SUMMARY
+/*	fifo server test program
+/* SYNOPSIS
+/*	fifo_rdonly_bug
+/* DESCRIPTION
+/*	fifo_rdonly_bug creates a FIFO and opens it read only. It
+/*	then opens the FIFO for writing, writes one byte, and closes
+/*	the writing end. On Linux Redhat 4.2 and 5.0, and HP-UX 9.05
+/*	and 10.20, select() will report that the FIFO remains readable
+/*	even after multiple read operations.
+/* 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_defs.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define FIFO_PATH	"test-fifo"
+#define TRIGGER_DELAY	5
+
+#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 perrorcleanup(char *str)
+{
+    perror(str);
+    cleanup();
+    exit(0);
+}
+
+static void readable_event(int fd)
+{
+    char    ch;
+    static int count = 0;
+
+    if (read(fd, &ch, 1) < 0) {
+	perror("read");
+	sleep(1);
+    }
+    if (count++ > 5) {
+	printf("FIFO remains readable after multiple reads.\n");
+	cleanup();
+	exit(1);
+    }
+}
+
+int     main(int unused_argc, char **unused_argv)
+{
+    struct timeval tv;
+    fd_set  read_fds;
+    fd_set  except_fds;
+    int     fd;
+    int     fd2;
+
+    (void) unlink(FIFO_PATH);
+
+    printf("Create fifo %s...\n", FIFO_PATH);
+    if (mkfifo(FIFO_PATH, 0600) < 0)
+	perrorexit("mkfifo");
+
+    printf("Open fifo %s, read-only mode...\n", FIFO_PATH);
+    if ((fd = open(FIFO_PATH, O_RDONLY | O_NONBLOCK, 0)) < 0)
+	perrorcleanup("open");
+
+    printf("Write one byte to the fifo, then close it...\n");
+    if ((fd2 = open(FIFO_PATH, O_WRONLY, 0)) < 0)
+	perrorcleanup("open fifo O_WRONLY");
+    if (write(fd2, "", 1) < 1)
+	perrorcleanup("write one byte to fifo");
+    if (close(fd2) < 0)
+	perrorcleanup("close fifo");
+
+    printf("Selecting the fifo for readability...\n");
+
+    for (;;) {
+	FD_ZERO(&read_fds);
+	FD_SET(fd, &read_fds);
+	FD_ZERO(&except_fds);
+	FD_SET(fd, &except_fds);
+	tv.tv_sec = 1;
+	tv.tv_usec = 0;
+
+	switch (select(fd + 1, &read_fds, (fd_set *) 0, &except_fds, &tv)) {
+	case -1:
+	    perrorexit("select");
+	default:
+	    if (FD_ISSET(fd, &except_fds)) {
+		printf("Exceptional fifo condition! You are not normal!\n");
+		readable_event(fd);
+	    } else if (FD_ISSET(fd, &read_fds)) {
+		printf("Readable fifo condition\n");
+		readable_event(fd);
+	    }
+	    break;
+	case 0:
+	    printf("The fifo is not readable. You're normal.\n");
+	    cleanup();
+	    exit(0);
+	    break;
+	}
+    }
+}
-- 
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