From cf4ab5e73f2c94edcf54568a3ee6054020690375 Mon Sep 17 00:00:00 2001
From: David Redondo <kde@david-redondo.de>
Date: Fri, 5 Apr 2024 11:52:02 +0200
Subject: [PATCH] Allow passing a fd to ei-demo-client

Like in ei-debug-events
---
 tools/ei-demo-client.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/ei-demo-client.c b/tools/ei-demo-client.c
index 4a8e1dc..95dd606 100644
--- a/tools/ei-demo-client.c
+++ b/tools/ei-demo-client.c
@@ -57,6 +57,7 @@
 #include "src/util-mem.h"
 #include "src/util-memmap.h"
 #include "src/util-color.h"
+#include "src/util-io.h"
 #include "src/util-strings.h"
 #include "src/util-time.h"
 
@@ -184,6 +185,7 @@ usage(FILE *fp, const char *argv0)
 		"Options:\n"
 		" --socket	Use the socket backend. The socket path is $LIBEI_SOCKET if set, \n"
 		"		otherwise $XDG_RUNTIME_DIR/eis-0\n"
+		" --socketfd    Use the given fd as socket to the EIS implementation\n"
 		" --verbose	Enable debugging output\n"
 		" --receiver	Create a receiver EIS context, receiving events instead of sending them\n"
 		" --interval    Interval in milliseconds between polling\n"
@@ -196,7 +198,9 @@ int main(int argc, char **argv)
 {
 	enum {
 		SOCKET,
+		FD,
 	} backend = SOCKET;
+	_cleanup_close_ int socketfd = -1;
 	bool verbose = false;
 	bool receiver = false;
 	unsigned int interval = 2000;
@@ -210,9 +214,11 @@ int main(int argc, char **argv)
 			OPT_RECEIVER,
 			OPT_INTERVAL,
 			OPT_ITERATIONS,
+			OPT_SOCKETFD,
 		};
 		static struct option long_opts[] = {
 			{"socket",	no_argument, 0, OPT_BACKEND_SOCKET},
+			{"socketfd",	required_argument, 0, OPT_SOCKETFD},
 			{"verbose",	no_argument, 0, OPT_VERBOSE},
 			{"receiver",	no_argument, 0, OPT_RECEIVER},
 			{"interval",    required_argument, 0, OPT_INTERVAL},
@@ -236,6 +242,12 @@ int main(int argc, char **argv)
 		case OPT_BACKEND_SOCKET:
 			backend = SOCKET;
 			break;
+		case OPT_SOCKETFD:
+			backend = FD;
+			if (!xatoi(optarg, &socketfd)) {
+				fprintf(stderr, "Invalid socketfd: %s", optarg);
+				return 2;
+			}
 			break;
 		case OPT_RECEIVER:
 			receiver = true;
@@ -270,6 +282,8 @@ int main(int argc, char **argv)
 		const char SOCKETNAME[] = "eis-0";
 		colorprint("connecting to %s\n", SOCKETNAME);
 		rc = ei_setup_backend_socket(ei, getenv("LIBEI_SOCKET") ? NULL : SOCKETNAME);
+	} else if (backend == FD) {
+		rc = ei_setup_backend_fd(ei, socketfd);
 	}
 
 	if (rc != 0) {