Make some formats/paths configurable, add initscript

Makefile

@@ -1,2 +1,10 @@
-all:
+wmiistatus: wmiistatus.c wmiistatus.h config.h Makefile
 	gcc -Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wshadow -Wpointer-arith -Wcast-qual -Wsign-compare -g -O2 -o wmiistatus wmiistatus.c
+
+install:
+	install -m 755 -d $(DESTDIR)/usr/bin
+	install -m 755 -d $(DESTDIR)/etc/init.d
+	install -m 755 wmiistatus $(DESTDIR)/usr/bin/wmiistatus
+	install -m 755 wmiistatus.init $(DESTDIR)/etc/init.d/wmiistatus
+
+all: wmiistatus

config.h

@@ -1,5 +1,7 @@
 const char *wlan_interface = "wlan0";
 const char *eth_interface = "eth0";
 const char *wmii_path = "/mnt/wmii/rbar/status";
+const char *time_format = "%d.%m.%Y %H:%M:%S";
+const char *battery = "/sys/class/power_supply/BAT0/uevent";
 const char *run_watches[] = {"DHCP", "/var/run/dhclient*.pid",
 			     "VPN", "/var/run/vpnc*.pid"};

wmiistatus.c

@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <stdbool.h>
+#include <stdarg.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <ctype.h>
@@ -63,8 +64,14 @@ static void write_to_statusbar(const char *message) {
  * Write errormessage to statusbar and exit
  *
  */
-static void die(const char *message) {
-	write_to_statusbar(message);
+static void die(const char *fmt, ...) {
+	char buffer[512];
+	va_list ap;
+	va_start(ap, fmt);
+	vsprintf(buffer, fmt, ap);
+	va_end(ap);
+
+	write_to_statusbar(buffer);
 	exit(-1);
 }
 
@@ -97,9 +104,9 @@ static char *get_battery_info() {
 	char buf[1024];
 	static char part[512];
 	char *walk, *last = buf;
-	int fd = open("/sys/class/power_supply/BAT0/uevent", O_RDONLY);
+	int fd = open(battery, O_RDONLY);
 	if (fd == -1)
-		die("Could not open /sys/class/power_supply/BAT0/uevent");
+		die("Could not open %s", battery);
 	int full_design = -1,
 	    remaining = -1,
 	    present_rate = -1;
@@ -237,7 +244,7 @@ static char *get_eth_info() {
  * Checks if the PID in path is still valid by checking if /proc/<pid> exists
  *
  */
-bool process_runs(const char *path) {
+static bool process_runs(const char *path) {
 	char pidbuf[512],
 	     procbuf[512];
 	static glob_t globbuf;
@@ -291,12 +298,10 @@ int main(void) {
 		/* Get date & time */
 		time_t current_time = time(NULL);
 		struct tm *current_tm = localtime(&current_time);
-		strftime(part, sizeof(part), "%d.%m.%Y %H:%M:%S", current_tm);
+		strftime(part, sizeof(part), time_format, current_tm);
 		push_part(part, strlen(part));
 
-		int fd = open("/mnt/wmii/rbar/status", O_RDWR);
-		write(fd, output, strlen(output));
-		close(fd);
+		write_to_statusbar(output);
 
 		sleep(1);
 	}

wmiistatus.h

@@ -6,11 +6,11 @@ static bool first_push = true;
 typedef enum { CS_DISCHARGING, CS_CHARGING, CS_FULL } charging_status_t;
 
 static void write_to_statusbar(const char *message);
-static void die(const char *message);
+static void die(const char *fmt, ...);
 static char *skip_character(char *input, char character, int amount);
 static void push_part(const char *input, const int n);
 static char *get_battery_info(void);
 static char *get_wireless_info(void);
 static char *get_ip_address(const char *interface);
 static char *get_eth_info(void);
-bool process_runs(const char *path);
+static bool process_runs(const char *path);

wmiistatus.init

@@ -0,0 +1,35 @@
+#!/bin/sh
+#
+### BEGIN INIT INFO
+# Provides:          wmiistatus
+# Required-Start:
+# Required-Stop:
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: little application to fill up wmii's status bar
+# Description:       little application to fill up wmii's status bar
+### END INIT INFO
+
+# For the pidfile, you must be root. wmiistatus itself runs as user just fine
+[ $UID -eq 0 ] || { echo "You need to be root"; exit 1; }
+
+. /lib/lsb/init-functions
+
+case "$1" in
+start)	log_daemon_msg "Starting wmii status bar filler" "wmiistatus"
+	start-stop-daemon --start --background --quiet --make-pidfile --pidfile /var/run/wmiistatus.pid --name wmiistatus --startas /usr/bin/wmiistatus
+	log_end_msg $?
+	;;
+stop)	log_daemon_msg "Stopping wmii status bar filler" "wmiistatus"
+	start-stop-daemon --stop --quiet --pidfile /var/run/wmiistatus.pid --name wmiistatus
+	log_end_msg $?
+	;;
+restart|reload|force-reload)	log_daemon_msg "Restarting wmii status bar filler" "wmiistatus"
+	start-stop-daemon --stop --retry 5 --quiet --pidfile /var/run/wmiistatus.pid --name wmiistatus
+	start-stop-daemon --start --background --quiet --make-pidfile --pidfile /var/run/wmiistatus.pid --name wmiistatus --startas /usr/bin/wmiistatus
+	;;
+*)	log_action_msg "Usage: $0 {start|stop|restart|reload|force-reload}"
+	exit 2
+	;;
+esac
+exit 0