Apply changes to code to support path; Add signal handling; Update README

makefile

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+# see LICENSE file for copyright and license information.
+
+NAME=mergeinputs
+LIBS = -lpthread
+SRC = ${NAME}.c
+OBJ = ${SRC:.c=.o}
+CFLAGS = -Os
+DESTDIR = /usr/local
+CC=gcc
+
+.c.o:
+	@echo CC $<
+	@${CC} -c ${CFLAGS} ${LIBS} $<
+
+${NAME}: ${OBJ}
+	@echo CC -o $@
+	@${CC} -o $@ ${OBJ} ${CFLAGS} ${LIBS}
+
+clean:
+	@echo cleaning
+	@rm -f ${NAME} *.o
+
+install: ${NAME}
+	@echo installing executable file to ${DESTDIR}/bin
+	@mkdir -p ${DESTDIR}/bin
+	@cp -f ${NAME} ${DESTDIR}/bin/${NAME}
+	@chmod 755 ${DESTDIR}/bin/${NAME}
+uninstall: ${NAME}
+	@echo removing executable file from ${DESTDIR}/bin
+	@rm -f ${DESTDIR}/bin/${NAME}

mergeinputs-restart.path

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+[Path]
+Unit=mergeinputs-restart.service
+PathChanged=/dev/input/by-path
+
+[Unit]
+StartLimitIntervalSec=5
+StartLimitBurst=20
+
+[Install]
+WantedBy=multi-user.target

mergeinputs-restart.service

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+[Unit]
+Description=mergeinputs restarter
+After=multi-user.target
+StartLimitIntervalSec=5
+StartLimitBurst=20
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/systemctl restart mergeinputs.service
+
+[Install]
+WantedBy=multi-user.target

mergeinputs.service

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+[Unit]
+Description=Merge multiple keyboards into one input
+After=multi-user.target
+ConditionPathExistsGlob=/dev/input/by-path/*-kbd
+StartLimitIntervalSec=5
+StartLimitBurst=20
+
+[Service]
+ExecStart=/bin/sh -c '/usr/local/bin/mergeinputs /dev/input/by-path/*-kbd'
+
+[Install]
+WantedBy=multi-user.target