From fadeddfbb2aa38a980dd959b5ec1ffba7afd43cb Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 15 Apr 2024 20:02:34 +0200
Subject: Adding upstream version 1.0.18.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 libevent/sample/event-read-fifo.c | 162 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 libevent/sample/event-read-fifo.c

(limited to 'libevent/sample/event-read-fifo.c')

diff --git a/libevent/sample/event-read-fifo.c b/libevent/sample/event-read-fifo.c
new file mode 100644
index 0000000..a17b9bd
--- /dev/null
+++ b/libevent/sample/event-read-fifo.c
@@ -0,0 +1,162 @@
+/*
+ * This sample code shows how to use Libevent to read from a named pipe.
+ * XXX This code could make better use of the Libevent interfaces.
+ *
+ * XXX This does not work on Windows; ignore everything inside the _WIN32 block.
+ *
+ * On UNIX, compile with:
+ * cc -I/usr/local/include -o event-read-fifo event-read-fifo.c \
+ *     -L/usr/local/lib -levent
+ */
+
+#include <event2/event-config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifndef _WIN32
+#include <sys/queue.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <signal.h>
+#else
+#include <winsock2.h>
+#include <windows.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <event2/event.h>
+
+static void
+fifo_read(evutil_socket_t fd, short event, void *arg)
+{
+	char buf[255];
+	int len;
+	struct event *ev = arg;
+#ifdef _WIN32
+	DWORD dwBytesRead;
+#endif
+
+	fprintf(stderr, "fifo_read called with fd: %d, event: %d, arg: %p\n",
+	    (int)fd, event, arg);
+#ifdef _WIN32
+	len = ReadFile((HANDLE)fd, buf, sizeof(buf) - 1, &dwBytesRead, NULL);
+
+	/* Check for end of file. */
+	if (len && dwBytesRead == 0) {
+		fprintf(stderr, "End Of File");
+		event_del(ev);
+		return;
+	}
+
+	buf[dwBytesRead] = '\0';
+#else
+	len = read(fd, buf, sizeof(buf) - 1);
+
+	if (len <= 0) {
+		if (len == -1)
+			perror("read");
+		else if (len == 0)
+			fprintf(stderr, "Connection closed\n");
+		event_del(ev);
+		event_base_loopbreak(event_get_base(ev));
+		return;
+	}
+
+	buf[len] = '\0';
+#endif
+	fprintf(stdout, "Read: %s\n", buf);
+}
+
+/* On Unix, cleanup event.fifo if SIGINT is received. */
+#ifndef _WIN32
+static void
+signal_cb(evutil_socket_t fd, short event, void *arg)
+{
+	struct event_base *base = arg;
+	event_base_loopbreak(base);
+}
+#endif
+
+int
+main(int argc, char **argv)
+{
+	struct event *evfifo;
+	struct event_base* base;
+#ifdef _WIN32
+	HANDLE socket;
+	/* Open a file. */
+	socket = CreateFileA("test.txt",	/* open File */
+			GENERIC_READ,		/* open for reading */
+			0,			/* do not share */
+			NULL,			/* no security */
+			OPEN_EXISTING,		/* existing file only */
+			FILE_ATTRIBUTE_NORMAL,	/* normal file */
+			NULL);			/* no attr. template */
+
+	if (socket == INVALID_HANDLE_VALUE)
+		return 1;
+
+#else
+	struct event *signal_int;
+	struct stat st;
+	const char *fifo = "event.fifo";
+	int socket;
+
+	if (lstat(fifo, &st) == 0) {
+		if ((st.st_mode & S_IFMT) == S_IFREG) {
+			errno = EEXIST;
+			perror("lstat");
+			exit(1);
+		}
+	}
+
+	unlink(fifo);
+	if (mkfifo(fifo, 0600) == -1) {
+		perror("mkfifo");
+		exit(1);
+	}
+
+	socket = open(fifo, O_RDONLY | O_NONBLOCK, 0);
+
+	if (socket == -1) {
+		perror("open");
+		exit(1);
+	}
+
+	fprintf(stderr, "Write data to %s\n", fifo);
+#endif
+	/* Initialize the event library */
+	base = event_base_new();
+
+	/* Initialize one event */
+#ifdef _WIN32
+	evfifo = event_new(base, (evutil_socket_t)socket, EV_READ|EV_PERSIST, fifo_read,
+                           event_self_cbarg());
+#else
+	/* catch SIGINT so that event.fifo can be cleaned up */
+	signal_int = evsignal_new(base, SIGINT, signal_cb, base);
+	event_add(signal_int, NULL);
+
+	evfifo = event_new(base, socket, EV_READ|EV_PERSIST, fifo_read,
+                           event_self_cbarg());
+#endif
+
+	/* Add it to the active events, without a timeout */
+	event_add(evfifo, NULL);
+
+	event_base_dispatch(base);
+	event_base_free(base);
+#ifdef _WIN32
+	CloseHandle(socket);
+#else
+	close(socket);
+	unlink(fifo);
+#endif
+	libevent_global_shutdown();
+	return (0);
+}
+
-- 
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