--- a/.hgignore	Sat Feb 29 12:26:40 2020 -0500
+++ b/.hgignore	Wed Apr 08 11:53:23 2020 -0400
@@ -16,3 +16,5 @@
 dump-ubx
 print-state
 reframe
+zeromq-log-recv
+zeromq-log-send

--- a/CMakeLists.txt	Sat Feb 29 12:26:40 2020 -0500
+++ b/CMakeLists.txt	Wed Apr 08 11:53:23 2020 -0400
@@ -125,3 +125,37 @@
 target_link_libraries(reframe
 	${JEFFPC_LIBRARY}
 )
+
+add_executable(zeromq-log-recv
+	zeromq-log-recv.c
+)
+
+set_target_properties(zeromq-log-recv PROPERTIES
+	LINK_FLAGS "-L${ZEROMQ_LIBRARY_DIRS}"
+)
+
+target_include_directories(zeromq-log-recv PRIVATE
+	${ZEROMQ_INCLUDE_DIRS}
+)
+
+target_link_libraries(zeromq-log-recv
+	${JEFFPC_LIBRARY}
+	${ZEROMQ_LIBRARIES}
+)
+
+add_executable(zeromq-log-send
+	zeromq-log-send.c
+)
+
+set_target_properties(zeromq-log-send PROPERTIES
+	LINK_FLAGS "-L${ZEROMQ_LIBRARY_DIRS}"
+)
+
+target_include_directories(zeromq-log-send PRIVATE
+	${ZEROMQ_INCLUDE_DIRS}
+)
+
+target_link_libraries(zeromq-log-send
+	${JEFFPC_LIBRARY}
+	${ZEROMQ_LIBRARIES}
+)

--- a/config.cmake	Sat Feb 29 12:26:40 2020 -0500
+++ b/config.cmake	Wed Apr 08 11:53:23 2020 -0400
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2019 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
+# Copyright (c) 2019-2020 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -22,3 +22,6 @@
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")
 find_package(jeffpc)
+
+include(FindPkgConfig)
+pkg_check_modules(ZEROMQ REQUIRED libzmq)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zeromq-log-recv.c	Wed Apr 08 11:53:23 2020 -0400
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2019-2020 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <jeffpc/error.h>
+
+#include <zmq.h>
+
+#include "xstdio.h"
+#include "frame.h"
+
+static const char *prog;
+
+static void usage(void)
+{
+	fprintf(stderr, "Usage: %s <endpoint>\n", prog);
+	fprintf(stderr, "\n");
+	fprintf(stderr, "  <stdout>       received frames\n");
+	fprintf(stderr, "  <endpoint>     address to receive messages from "
+		"(e.g., tcp://example.com:1234)\n");
+	exit(99);
+}
+
+int main(int argc, char **argv)
+{
+	const char *endpoint;
+	size_t frames;
+	void *sock;
+	void *ctx;
+	int ret;
+
+	prog = argv[0];
+
+	if (argc != 2)
+		usage();
+
+	endpoint = argv[1];
+
+	ctx = zmq_ctx_new();
+	if (!ctx) {
+		fprintf(stderr, "Error: failed to create context: %s\n",
+			strerror(errno));
+		return 1;
+	}
+
+	sock = zmq_socket(ctx, ZMQ_SUB);
+	if (!sock) {
+		fprintf(stderr, "Error: failed to create socket: %s\n",
+			strerror(errno));
+		return 2;
+	}
+
+	ret = zmq_setsockopt(sock, ZMQ_SUBSCRIBE, NULL, 0);
+	if (ret) {
+		fprintf(stderr, "Error: failed to subscribe: %s\n",
+			strerror(errno));
+		return 3;
+	}
+
+	ret = zmq_connect(sock, endpoint);
+	if (ret) {
+		fprintf(stderr, "Error: failed to connect socket: %s\n",
+			strerror(errno));
+		return 4;
+	}
+
+	for (frames = 0;; frames++) {
+		uint8_t buf[(1u << 16) + sizeof(struct frame)];
+		struct frame frame;
+		size_t payload_len;
+
+		ret = zmq_recv(sock, buf, sizeof(buf), 0);
+		if (ret < 0) {
+			fprintf(stderr, "Error: failed to recv a message: %s\n",
+				strerror(errno));
+			return 5;
+		}
+		if (ret > sizeof(buf)) {
+			fprintf(stderr, "Warning: received message truncated: "
+				"expected max %zu bytes, got %d\n",
+				sizeof(buf), ret);
+			continue;
+		}
+
+		memcpy(&frame, buf, sizeof(frame));
+
+		if (be32_to_cpu(frame.magic) != FRAME_MAGIC) {
+			fprintf(stderr, "Warning: frame magic mismatch "
+				"(got %08x exp %08x)\n",
+				be32_to_cpu(frame.magic), FRAME_MAGIC);
+			continue;
+		}
+
+		payload_len = be32_to_cpu(frame.len);
+
+		if ((sizeof(struct frame) + payload_len) != ret) {
+			fprintf(stderr, "Warning: frame payload length mismatch: "
+				"received %d byte message, frame should have "
+				"%zu byte payload + %zu header (%zu total)\n",
+				ret, payload_len, sizeof(struct frame),
+				sizeof(struct frame) + payload_len);
+			continue;
+		}
+
+		ret = xfwrite(stdout, buf, sizeof(struct frame) + payload_len);
+		if (ret) {
+			fprintf(stderr, "Error: failed to write frame to stdout\n");
+			return 4;
+		}
+
+		fflush(stdout);
+	}
+
+	fprintf(stderr, "Info: processed %zu frames\n", frames);
+
+	ret = zmq_close(sock);
+	if (ret) {
+		fprintf(stderr, "Error: failed to close socket: %s\n",
+			strerror(errno));
+		return 8;
+	}
+
+	ret = zmq_ctx_destroy(ctx);
+	if (ret) {
+		fprintf(stderr, "Error: failed to destroy context: %s\n",
+			strerror(errno));
+		return 9;
+	}
+
+	return 0;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zeromq-log-send.c	Wed Apr 08 11:53:23 2020 -0400
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2019-2020 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <jeffpc/error.h>
+
+#include <zmq.h>
+
+#include "xstdio.h"
+#include "frame.h"
+
+static const char *prog;
+
+static void usage(void)
+{
+	fprintf(stderr, "Usage: %s <endpoint>\n", prog);
+	fprintf(stderr, "\n");
+	fprintf(stderr, "  <stdin>        input framed log\n");
+	fprintf(stderr, "  <stdout>       copy of input\n");
+	fprintf(stderr, "  <endpoint>     address to send messages to "
+		"(e.g., tcp://example.com:1234)\n");
+	exit(99);
+}
+
+int main(int argc, char **argv)
+{
+	const char *endpoint;
+	size_t frames;
+	void *sock;
+	void *ctx;
+	int ret;
+
+	prog = argv[0];
+
+	if (argc != 2)
+		usage();
+
+	endpoint = argv[1];
+
+	ctx = zmq_ctx_new();
+	if (!ctx) {
+		fprintf(stderr, "Error: failed to create context: %s\n",
+			strerror(errno));
+		return 1;
+	}
+
+	sock = zmq_socket(ctx, ZMQ_PUB);
+	if (!sock) {
+		fprintf(stderr, "Error: failed to create socket: %s\n",
+			strerror(errno));
+		return 2;
+	}
+
+	ret = zmq_bind(sock, endpoint);
+	if (ret) {
+		fprintf(stderr, "Error: failed to bind socket: %s\n",
+			strerror(errno));
+		return 3;
+	}
+
+	for (frames = 0;; frames++) {
+		uint8_t buf[(1u << 16) + sizeof(struct frame)];
+		struct frame frame;
+		size_t payload_len;
+
+		ret = xfread(stdin, &frame, sizeof(frame));
+		if (ret) {
+			fprintf(stderr, "Error: failed to read frame header\n");
+			break;
+		}
+
+		if (be32_to_cpu(frame.magic) != FRAME_MAGIC) {
+			fprintf(stderr, "Error: frame magic mismatch "
+				"(got %08x exp %08x)\n",
+				be32_to_cpu(frame.magic), FRAME_MAGIC);
+			break;
+		}
+
+		payload_len = be32_to_cpu(frame.len);
+
+		memcpy(buf, &frame, sizeof(frame));
+
+		ret = xfread(stdin, &buf[sizeof(struct frame)], payload_len);
+		if (ret) {
+			fprintf(stderr, "Error: failed to read frame payload\n");
+			break;
+		}
+
+		ret = xfwrite(stdout, buf, sizeof(struct frame) + payload_len);
+		if (ret) {
+			fprintf(stderr, "Error: failed to write frame to stdout\n");
+			return 4;
+		}
+
+		fflush(stdout);
+
+		ret = zmq_send(sock, buf, sizeof(struct frame) + payload_len, 0);
+		if (ret < 0)
+			fprintf(stderr, "Warning: failed to send frame: %s\n",
+				strerror(errno));
+		else if (ret != (sizeof(struct frame) + payload_len))
+			fprintf(stderr, "Warning: failed to send the whole "
+				"frame of %zu bytes (%d sent)\n",
+				sizeof(struct frame) + payload_len, ret);
+	}
+
+	fprintf(stderr, "Info: processed %zu frames\n", frames);
+
+	ret = zmq_close(sock);
+	if (ret) {
+		fprintf(stderr, "Error: failed to close socket: %s\n",
+			strerror(errno));
+		return 8;
+	}
+
+	ret = zmq_ctx_destroy(ctx);
+	if (ret) {
+		fprintf(stderr, "Error: failed to destroy context: %s\n",
+			strerror(errno));
+		return 9;
+	}
+
+	return 0;
+}