X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/b176d0a2d0e3048f22b35083ea7d6571aaa69260..597cdc6b5c6ae4508861bb1122c05acd5850198c:/slstatus.c

diff --git a/slstatus.c b/slstatus.c
index d6f5e2d..b592446 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,393 +1,870 @@
 /* See LICENSE file for copyright and license details. */
 
-/* global libraries */
-#include <alsa/asoundlib.h>
+#include <err.h>
 #include <fcntl.h>
+#include <ifaddrs.h>
+#include <limits.h>
+#include <linux/wireless.h>
 #include <locale.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
+#include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <sys/socket.h>
+#include <sys/soundcard.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
 #include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 
-/* global variables */
-static Display *dpy;
+#include "arg.h"
 
-/* statusbar configuration type and struct */
-typedef char *(*op_fun) (const char *);
 struct arg {
-    op_fun func;
-    const char *format;
-    const char *args;
+	const char *(*func)();
+	const char *fmt;
+	const char *args;
 };
 
-/* functions */
-void setstatus(const char *);
-char *smprintf(const char *, ...);
-char *get_battery(const char *);
-char *get_cpu_temperature(const char *);
-char *get_cpu_usage(const char *);
-char *get_datetime(const char *);
-char *get_diskusage(const char *);
-char *get_ram_usage(const char *);
-char *get_volume(const char *);
-char *get_wifi_signal(const char *);
-
-/* include config header */
+static const char *bprintf(const char *fmt, ...);
+static const char *battery_perc(const char *bat);
+static const char *battery_power(const char *bat);
+static const char *battery_state(const char *bat);
+static const char *cpu_freq(void);
+static const char *cpu_perc(void);
+static const char *datetime(const char *fmt);
+static const char *disk_free(const char *mnt);
+static const char *disk_perc(const char *mnt);
+static const char *disk_total(const char *mnt);
+static const char *disk_used(const char *mnt);
+static const char *entropy(void);
+static const char *gid(void);
+static const char *hostname(void);
+static const char *ip(const char *iface);
+static const char *kernel_release(void);
+static const char *keyboard_indicators(void);
+static const char *load_avg(void);
+static const char *ram_free(void);
+static const char *ram_perc(void);
+static const char *ram_used(void);
+static const char *ram_total(void);
+static const char *run_command(const char *cmd);
+static const char *swap_free(void);
+static const char *swap_perc(void);
+static const char *swap_used(void);
+static const char *swap_total(void);
+static const char *temp(const char *file);
+static const char *uid(void);
+static const char *uptime(void);
+static const char *username(void);
+static const char *vol_perc(const char *card);
+static const char *wifi_perc(const char *iface);
+static const char *wifi_essid(const char *iface);
+static void sighandler(const int signo);
+static void usage(const int eval);
+
+char *argv0;
+static unsigned short int delay = 0;
+static unsigned short int done;
+static unsigned short int dflag, oflag, nflag;
+static Display *dpy;
+
 #include "config.h"
 
-/* set statusbar */
-void
-setstatus(const char *str)
+static char buf[MAXLEN];
+
+static const char *
+bprintf(const char *fmt, ...)
+{
+	va_list ap;
+	size_t len;
+
+	va_start(ap, fmt);
+	len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+	va_end(ap);
+
+	if (len >= sizeof(buf))
+		buf[sizeof(buf)-1] = '\0';
+
+	return buf;
+}
+
+static const char *
+battery_perc(const char *bat)
+{
+	int perc;
+	char path[PATH_MAX];
+	FILE *fp;
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", path);
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%i", &perc);
+	fclose(fp);
+
+	return bprintf("%d", perc);
+}
+
+static const char *
+battery_power(const char *bat)
+{
+	char path[PATH_MAX];
+	FILE *fp;
+	int watts;
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", path);
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%i", &watts);
+	fclose(fp);
+
+	return bprintf("%d", (watts + 500000) / 1000000);
+}
+
+static const char *
+battery_state(const char *bat)
+{
+	char path[PATH_MAX];
+	char state[12];
+	FILE *fp;
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", path);
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%12s", state);
+	fclose(fp);
+
+	if (strcmp(state, "Charging") == 0) {
+		return "+";
+	} else if (strcmp(state, "Discharging") == 0) {
+		return "-";
+	} else if (strcmp(state, "Full") == 0) {
+		return "=";
+	} else if (strcmp(state, "Unknown") == 0) {
+		return "/";
+	} else {
+		return "?";
+	}
+}
+
+static const char *
+cpu_freq(void)
+{
+	int freq;
+	FILE *fp;
+
+	fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%i", &freq);
+	fclose(fp);
+
+	return bprintf("%d", (freq + 500) / 1000);
+}
+
+static const char *
+cpu_perc(void)
+{
+	int perc;
+	long double a[4], b[4];
+	FILE *fp;
+
+	fp = fopen("/proc/stat", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/stat");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+	fclose(fp);
+
+	delay++;
+	sleep(delay);
+
+	fp = fopen("/proc/stat", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/stat");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+	fclose(fp);
+
+	perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
+	return bprintf("%d", perc);
+}
+
+static const char *
+datetime(const char *fmt)
+{
+	time_t t;
+
+	t = time(NULL);
+	if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
+		return UNKNOWN_STR;
+
+	return buf;
+}
+
+static const char *
+disk_free(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return UNKNOWN_STR;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+}
+
+static const char *
+disk_perc(const char *mnt)
+{
+	int perc;
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return UNKNOWN_STR;
+	}
+
+	perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+
+	return bprintf("%d", perc);
+}
+
+static const char *
+disk_total(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return UNKNOWN_STR;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+}
+
+static const char *
+disk_used(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return UNKNOWN_STR;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+}
+
+static const char *
+entropy(void)
 {
-    /* set WM_NAME via X11 */
-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
+	int num;
+	FILE *fp;
+
+	fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%d", &num);
+	fclose(fp);
+
+	return bprintf("%d", num);
 }
 
-/* smprintf function */
-char *
-smprintf(const char *fmt, ...)
+static const char *
+gid(void)
 {
-    va_list fmtargs;
-    char *ret = NULL;
+	return bprintf("%d", getgid());
+}
 
-    va_start(fmtargs, fmt);
-    if (vasprintf(&ret, fmt, fmtargs) < 0)
-        return NULL;
-    va_end(fmtargs);
+static const char *
+hostname(void)
+{
+	if (gethostname(buf, sizeof(buf)) == -1) {
+		warn("hostname");
+		return UNKNOWN_STR;
+	}
 
-    return ret;
+	return buf;
 }
 
-/* battery percentage */
-char *
-get_battery(const char *battery)
+static const char *
+ip(const char *iface)
 {
-    int now, full, perc;
-    char batterynowfile[64] = "";
-    char batteryfullfile[64] = "";
-    FILE *fp;
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
+
+	if (getifaddrs(&ifaddr) == -1) {
+		warn("Failed to get IP address for interface %s", iface);
+		return UNKNOWN_STR;
+	}
+
+	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+		if (ifa->ifa_addr == NULL) {
+			continue;
+		}
+		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+		if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
+			if (s != 0) {
+				warnx("Failed to get IP address for interface %s", iface);
+				return UNKNOWN_STR;
+			}
+			return bprintf("%s", host);
+		}
+	}
+
+	freeifaddrs(ifaddr);
+
+	return UNKNOWN_STR;
+}
 
-    /* generate battery nowfile path */
-    strcat(batterynowfile, batterypath);
-    strcat(batterynowfile, battery);
-    strcat(batterynowfile, "/");
-    strcat(batterynowfile, batterynow);
+static const char *
+kernel_release(void)
+{
+	struct utsname udata;
 
-    /* generate battery fullfile path */
-    strcat(batteryfullfile, batterypath);
-    strcat(batteryfullfile, battery);
-    strcat(batteryfullfile, "/");
-    strcat(batteryfullfile, batteryfull);
+	if (uname(&udata) < 0) {
+		return UNKNOWN_STR;
+	}
 
-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.%s",batterynowfile);
-        return smprintf("n/a");
-    }
+	return bprintf("%s", udata.release);
+}
 
-    /* read value */
-    fscanf(fp, "%i", &now);
+static const char *
+keyboard_indicators(void)
+{
+	Display *dpy = XOpenDisplay(NULL);
+	XKeyboardState state;
+	XGetKeyboardControl(dpy, &state);
+	XCloseDisplay(dpy);
+
+	switch (state.led_mask) {
+		case 1:
+			return "c";
+		case 2:
+			return "n";
+		case 3:
+			return "cn";
+		default:
+			return "";
+	}
+}
 
-    /* close battery now file */
-    fclose(fp);
+static const char *
+load_avg(void)
+{
+	double avgs[3];
 
-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
+	if (getloadavg(avgs, 3) < 0) {
+		warnx("Failed to get the load avg");
+		return UNKNOWN_STR;
+	}
 
-    /* read value */
-    fscanf(fp, "%i", &full);
+	return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
+}
 
-    /* close battery full file */
-    fclose(fp);
+static const char *
+ram_free(void)
+{
+	long free;
+	FILE *fp;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fclose(fp);
+
+	return bprintf("%f", (float)free / 1024 / 1024);
+}
 
-    /* calculate percent */
-    perc = now / (full / 100);
+static const char *
+ram_perc(void)
+{
+	long total, free, buffers, cached;
+	FILE *fp;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
+	fclose(fp);
+
+	return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
+}
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+static const char *
+ram_total(void)
+{
+	long total;
+	FILE *fp;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fclose(fp);
+
+	return bprintf("%f", (float)total / 1024 / 1024);
 }
 
-/* cpu temperature */
-char *
-get_cpu_temperature(const char *file)
+static const char *
+ram_used(void)
 {
-    int temperature;
-    FILE *fp;
+	long free, total, buffers, cached;
+	FILE *fp;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
+	fclose(fp);
+
+	return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
+}
 
-    /* open temperature file */
-    if (!(fp = fopen(file, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        return smprintf("n/a");
-    }
+static const char *
+run_command(const char *cmd)
+{
+	char *nlptr;
+	FILE *fp;
+
+	fp = popen(cmd, "r");
+	if (fp == NULL) {
+		warn("Failed to get command output for %s", cmd);
+		return UNKNOWN_STR;
+	}
+	fgets(buf, sizeof(buf) - 1, fp);
+	pclose(fp);
+	if ((nlptr = strrchr(buf, '\n')) != NULL)
+		nlptr[0] = '\0';
+
+	return buf[0] ? buf : UNKNOWN_STR;
+}
 
-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+static const char *
+swap_free(void)
+{
+	long total, free;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_free: read error");
+		fclose(fp);
+		return UNKNOWN_STR;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)free / 1024 / 1024);
+}
 
-    /* close temperature file */
-    fclose(fp);
+static const char *
+swap_perc(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_perc: read error");
+		fclose(fp);
+		return UNKNOWN_STR;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%d", 100 * (total - free - cached) / total);
+}
 
-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+static const char *
+swap_total(void)
+{
+	long total;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_total: read error");
+		fclose(fp);
+		return UNKNOWN_STR;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	return bprintf("%f", (float)total / 1024 / 1024);
 }
 
-/* cpu percentage */
-char *
-get_cpu_usage(const char *null)
+static const char *
+swap_used(void)
 {
-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return UNKNOWN_STR;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_used: read error");
+		fclose(fp);
+		return UNKNOWN_STR;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return UNKNOWN_STR;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
+}
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+static const char *
+temp(const char *file)
+{
+	int temp;
+	FILE *fp;
+
+	fp = fopen(file, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", file);
+		return UNKNOWN_STR;
+	}
+	fscanf(fp, "%d", &temp);
+	fclose(fp);
+
+	return bprintf("%d", temp / 1000);
+}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+static const char *
+uptime(void)
+{
+	struct sysinfo info;
+	int h = 0;
+	int m = 0;
 
-    /* close stat file */
-    fclose(fp);
+	sysinfo(&info);
+	h = info.uptime / 3600;
+	m = (info.uptime - h * 3600 ) / 60;
 
-    /* wait a second (for avg values) */
-    sleep(1);
+	return bprintf("%dh %dm", h, m);
+}
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+static const char *
+username(void)
+{
+	struct passwd *pw = getpwuid(geteuid());
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+	if (pw == NULL) {
+		warn("Failed to get username");
+		return UNKNOWN_STR;
+	}
 
-    /* close stat file */
-    fclose(fp);
+	return bprintf("%s", pw->pw_name);
+}
+
+static const char *
+uid(void)
+{
+	return bprintf("%d", geteuid());
+}
 
-    /* calculate avg in this second */
-    perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+static const char *
+vol_perc(const char *card)
+{
+	unsigned int i;
+	int v, afd, devmask;
+	char *vnames[] = SOUND_DEVICE_NAMES;
+
+	afd = open(card, O_RDONLY | O_NONBLOCK);
+	if (afd == -1) {
+		warn("Cannot open %s", card);
+		return UNKNOWN_STR;
+	}
+
+	if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
+		warn("Cannot get volume for %s", card);
+		close(afd);
+		return UNKNOWN_STR;
+	}
+	for (i = 0; i < (sizeof(vnames) / sizeof((vnames[0]))); i++) {
+		if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
+			if (ioctl(afd, MIXER_READ(i), &v) == -1) {
+				warn("vol_perc: ioctl");
+				close(afd);
+				return UNKNOWN_STR;
+			}
+		}
+	}
+
+	close(afd);
+
+	return bprintf("%d", v & 0xff);
 }
 
-/* date and time */
-char *
-get_datetime(const char *timeformat)
+static const char *
+wifi_perc(const char *iface)
 {
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
+	int perc;
+	char *datastart;
+	char path[PATH_MAX];
+	char status[5];
+	FILE *fp;
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", path);
+		return UNKNOWN_STR;
+	}
+	fgets(status, 5, fp);
+	fclose(fp);
+	if(strcmp(status, "up\n") != 0) {
+		return UNKNOWN_STR;
+	}
+
+	fp = fopen("/proc/net/wireless", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/net/wireless");
+		return UNKNOWN_STR;
+	}
+
+	fgets(buf, sizeof(buf) - 1, fp);
+	fgets(buf, sizeof(buf) - 1, fp);
+	fgets(buf, sizeof(buf) - 1, fp);
+	fclose(fp);
+
+	if ((datastart = strstr(buf, iface)) == NULL)
+		return UNKNOWN_STR;
+
+	datastart = (datastart+(strlen(iface)+1));
+	sscanf(datastart + 1, " %*d   %d  %*d  %*d		  %*d	   %*d		%*d		 %*d	  %*d		 %*d", &perc);
+
+	return bprintf("%d", perc);
+}
 
-    /* get time in format */
-    time(&tm);
-    setlocale(LC_TIME, "");
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-        setlocale(LC_TIME, "C");
-        fprintf(stderr, "Strftime failed.\n");
-        return smprintf("n/a");
-    }
+static const char *
+wifi_essid(const char *iface)
+{
+	static char id[IW_ESSID_MAX_SIZE+1];
+	int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+	struct iwreq wreq;
+
+	memset(&wreq, 0, sizeof(struct iwreq));
+	wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
+	snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
+
+	if (sockfd == -1) {
+		warn("Failed to get ESSID for interface %s", iface);
+		return UNKNOWN_STR;
+	}
+	wreq.u.essid.pointer = id;
+	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+		warn("Failed to get ESSID for interface %s", iface);
+		return UNKNOWN_STR;
+	}
+
+	close(sockfd);
+
+	if (strcmp(id, "") == 0)
+		return UNKNOWN_STR;
+	else
+		return id;
+}
 
-    setlocale(LC_TIME, "C");
-    /* return time */
-    return smprintf("%s", buf);
+static void
+sighandler(const int signo)
+{
+	if (signo == SIGTERM || signo == SIGINT) {
+		done = 1;
+	}
+}
+
+static void
+usage(const int eval)
+{
+	fprintf(stderr, "usage: %s [-d] [-o] [-n] [-v] [-h]\n", argv0);
+	exit(eval);
 }
 
-/* disk usage percentage */
-char *
-get_diskusage(const char *mountpoint)
-{
-    int perc = 0;
-    struct statvfs fs;
-
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
-
-    /* calculate percent */
-    perc = 100 * (1.0f - ((float)fs.f_bavail / (float)fs.f_blocks));
-
-    /* return perc */
-    return smprintf("%d%%", perc);
-}
-
-/* ram percentage */
-char *
-get_ram_usage(const char *null)
-{
-    int perc;
-    long total, free, buffers, cached;
-    FILE *fp;
-
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
-
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
-    fscanf(fp, "MemFree: %ld kB\n", &free);
-    fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
-    fscanf(fp, "Cached: %ld kB\n", &cached);
-
-    /* close meminfo file */
-    fclose(fp);
-
-    /* calculate percentage */
-    perc = 100 * ((total - free) - (buffers + cached)) / total;
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
-}
-
-/* alsa volume percentage */
-char *
-get_volume(const char *soundcard)
-{
-    int mute = 0;
-    long vol = 0, max = 0, min = 0;
-
-    /* get volume from alsa */
-    snd_mixer_t *handle;
-    snd_mixer_elem_t *pcm_mixer, *mas_mixer;
-    snd_mixer_selem_id_t *vol_info, *mute_info;
-    snd_mixer_open(&handle, 0);
-    snd_mixer_attach(handle, soundcard);
-    snd_mixer_selem_register(handle, NULL, NULL);
-    snd_mixer_load(handle);
-    snd_mixer_selem_id_malloc(&vol_info);
-    snd_mixer_selem_id_malloc(&mute_info);
-    snd_mixer_selem_id_set_name(vol_info, channel);
-    snd_mixer_selem_id_set_name(mute_info, channel);
-    pcm_mixer = snd_mixer_find_selem(handle, vol_info);
-    mas_mixer = snd_mixer_find_selem(handle, mute_info);
-    snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
-    snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
-    snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
-    if (vol_info)
-        snd_mixer_selem_id_free(vol_info);
-    if (mute_info)
-        snd_mixer_selem_id_free(mute_info);
-    if (handle)
-        snd_mixer_close(handle);
-
-    /* return the string (mute) */
-    if (!mute)
-        return smprintf("mute");
-    else
-        return smprintf("%d%%", (vol * 100) / max);
-}
-
-/* wifi percentage */
-char *
-get_wifi_signal(const char *wificard)
-{
-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path[64];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
-
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, "/sys/class/net/");
-    strcat(path, wificard);
-    strcat(path, "/operstate");
-
-    /* open wifi file */
-    if(!(fp = fopen(path, "r"))) {
-        fprintf(stderr, "Error opening wifi operstate file.");
-        return smprintf("n/a");
-    }
-
-    /* read the status */
-    fgets(status, 5, fp);
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* check if interface down */
-    if(strcmp(status, "up\n") != 0){
-        return smprintf("n/a");
-    }
-
-    /* open wifi file */
-    if (!(fp = fopen("/proc/net/wireless", "r"))) {
-        fprintf(stderr, "Error opening wireless file.");
-        return smprintf("n/a");
-    }
-
-    /* extract the signal strength */
-    strcpy(needle, wificard);
-    strcat(needle, ":");
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    if ((datastart = strstr(buf, needle)) != NULL) {
-        datastart = strstr(buf, ":");
-        sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
-    }
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* return strength in percent */
-    return smprintf("%d%%", strength);
-}
-
-/* main function */
 int
-main()
-{
-    char status_string[1024];
-    struct arg argument;
-
-    /* try to open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
-
-    /* return status every interval */
-    for (;;) {
-        /* clear the string */
-        strcpy(status_string, "");
-
-        /* generate status_string */
-        for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
-            argument = args[i];
-            char *res = argument.func(argument.args);
-            char *element = smprintf(argument.format, res);
-            strcat(status_string, element);
-        }
-
-        /* return the statusbar */
-        setstatus(status_string);
-
-        /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
-        sleep(update_interval -1);
-    }
-
-    /* close display */
-    XCloseDisplay(dpy);
-
-    /* exit successfully */
-    return 0;
+main(int argc, char *argv[])
+{
+	unsigned short int i;
+	char status_string[MAXLEN];
+	char *element;
+	struct arg argument;
+	struct sigaction act;
+	size_t len;
+
+	ARGBEGIN {
+		case 'd':
+			dflag = 1;
+			break;
+		case 'o':
+			oflag = 1;
+			break;
+		case 'n':
+			nflag = 1;
+			break;
+		case 'v':
+			printf("slstatus (C) 2016-2017 slstatus engineers\n");
+			return 0;
+		case 'h':
+			usage(0);
+		default:
+			usage(1);
+	} ARGEND
+
+	if ((dflag && oflag) || (dflag && nflag) || (oflag && nflag)) {
+		usage(1);
+	}
+	if (dflag && daemon(1, 1) < 0) {
+		err(1, "daemon");
+	}
+
+	memset(&act, 0, sizeof(act));
+	act.sa_handler = sighandler;
+	sigaction(SIGINT,  &act, 0);
+	sigaction(SIGTERM, &act, 0);
+
+	if (!oflag) {
+		dpy = XOpenDisplay(NULL);
+	}
+
+	setlocale(LC_ALL, "");
+
+	while (!done) {
+		status_string[0] = '\0';
+
+		for (element = status_string, i = len = 0;
+		     i < sizeof(args) / sizeof(args[0]);
+		     ++i, element += len) {
+			argument = args[i];
+			len = snprintf(element, sizeof(status_string)-1 - len,
+			               argument.fmt,
+			               argument.func(argument.args));
+			if (len >= sizeof(status_string)) {
+				status_string[sizeof(status_string)-1] = '\0';
+				break;
+			}
+		}
+
+		if (oflag) {
+			printf("%s\n", status_string);
+		} else if (nflag) {
+			printf("%s\n", status_string);
+			done = 1;
+		} else {
+			XStoreName(dpy, DefaultRootWindow(dpy), status_string);
+			XSync(dpy, False);
+		}
+
+		if ((UPDATE_INTERVAL - delay) <= 0) {
+			delay = 0;
+			continue;
+		} else {
+			sleep(UPDATE_INTERVAL - delay);
+			delay = 0;
+		}
+	}
+
+	if (!oflag) {
+		XStoreName(dpy, DefaultRootWindow(dpy), NULL);
+		XCloseDisplay(dpy);
+	}
+
+	return 0;
 }