remove newlines from warn() in swap_*(), those functions already print a newline...

[slstatus.git] / slstatus.c

diff --git a/slstatus.c b/slstatus.c
index 42e5751..e6e726e 100644 (file)
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,364 +1,842 @@
 /* See LICENSE file for copyright and license details. */
 
 /* See LICENSE file for copyright and license details. */
 

-/* global libraries */

 #include <alsa/asoundlib.h>
 #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 <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/socket.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
+#include <sys/utsname.h>

 #include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 
 #include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 

-/* local libraries */
+#undef strlcat
+#undef strlcpy
+
+#include "extern/arg.h"
+#include "extern/strlcat.h"
+#include "extern/concat.h"
+
+struct arg {
+       char *(*func)();
+       const char *fmt;
+       const char *args;
+};
+
+static char *smprintf(const char *fmt, ...);
+static char *battery_perc(const char *bat);
+static char *battery_state(const char *bat);
+static char *cpu_perc(void);
+static char *datetime(const char *fmt);
+static char *disk_free(const char *mnt);
+static char *disk_perc(const char *mnt);
+static char *disk_total(const char *mnt);
+static char *disk_used(const char *mnt);
+static char *entropy(void);
+static char *gid(void);
+static char *hostname(void);
+static char *ip(const char *iface);
+static char *load_avg(void);
+static char *ram_free(void);
+static char *ram_perc(void);
+static char *ram_used(void);
+static char *ram_total(void);
+static char *run_command(const char *cmd);
+static char *swap_free(void);
+static char *swap_perc(void);
+static char *swap_used(void);
+static char *swap_total(void);
+static char *temp(const char *file);
+static char *uid(void);
+static char *uptime(void);
+static char *username(void);
+static char *vol_perc(const char *card);
+static char *wifi_perc(const char *iface);
+static char *wifi_essid(const char *iface);
+static char *kernel_release(void);
+static void set_status(const char *str);
+static void sighandler(const int signo);
+static void usage(void);
+
+char *argv0;
+char concat[];
+static unsigned short int delay;
+static unsigned short int done;
+static unsigned short int dflag, oflag;
+static Display *dpy;
+

 #include "config.h"
 
 #include "config.h"
 

-/* functions */
-void setstatus(char *str);
-char *smprintf(char *fmt, ...);
-char *get_battery();
-char *get_cpu_temperature();
-char *get_cpu_usage();
-char *get_datetime();
-char *get_ram_usage();
-char *get_volume();
-char *get_wifi_signal();
-
-/* global variables */
-static Display *dpy;
+static char *
+smprintf(const char *fmt, ...)
+{
+       va_list ap;
+       char *ret;
+       int len;
+
+       va_start(ap, fmt);
+       len = vsnprintf(NULL, 0, fmt, ap);
+       va_end(ap);
+
+       ret = malloc(++len);
+       if (ret == NULL) {
+               err(1, "malloc");
+       }
+
+       va_start(ap, fmt);
+       vsnprintf(ret, len, fmt, ap);
+       va_end(ap);
+
+       return ret;
+}
+
+static char *
+battery_perc(const char *bat)
+{
+       int perc;
+       FILE *fp;
+
+       ccat(3, "/sys/class/power_supply/", bat, "/capacity");
+       fp = fopen(concat, "r");
+       if (fp == NULL) {
+               warn("Failed to open file %s", concat);
+               return smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "%i", &perc);
+       fclose(fp);
+
+       return smprintf("%d%%", perc);
+}
+
+static char *
+battery_state(const char *bat)
+{
+       char state[12];
+       FILE *fp;
+
+       ccat(3, "/sys/class/power_supply/", bat, "/status");
+       fp = fopen(concat, "r");
+       if (fp == NULL) {
+               warn("Failed to open file %s", concat);
+               return smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "%12s", state);
+       fclose(fp);
+
+       if (strcmp(state, "Charging") == 0) {
+               return smprintf("+");
+       } else if (strcmp(state, "Discharging") == 0) {
+               return smprintf("-");
+       } else if (strcmp(state, "Full") == 0) {
+               return smprintf("=");
+       } else {
+               return smprintf("?");
+       }
+}
+
+static 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 smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+       fclose(fp);
+
+       delay = (UPDATE_INTERVAL - (UPDATE_INTERVAL - 1));
+       sleep(delay);
+
+       fp = fopen("/proc/stat", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/stat");
+               return smprintf(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 smprintf("%d%%", perc);
+}
+
+static char *
+datetime(const char *fmt)
+{
+       time_t t;
+       char str[80];
+
+       t = time(NULL);
+       if (strftime(str, sizeof(str), fmt, localtime(&t)) == 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%s", str);
+}
+
+static char *
+disk_free(const char *mnt)
+{
+       struct statvfs fs;
+
+       if (statvfs(mnt, &fs) < 0) {
+               warn("Failed to get filesystem info");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+}
+
+static char *
+disk_perc(const char *mnt)
+{
+       int perc;
+       struct statvfs fs;
+
+       if (statvfs(mnt, &fs) < 0) {
+               warn("Failed to get filesystem info");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+
+       return smprintf("%d%%", perc);
+}
+
+static char *
+disk_total(const char *mnt)
+{
+       struct statvfs fs;
+
+       if (statvfs(mnt, &fs) < 0) {
+               warn("Failed to get filesystem info");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+}
+
+static char *
+disk_used(const char *mnt)
+{
+       struct statvfs fs;
+
+       if (statvfs(mnt, &fs) < 0) {
+               warn("Failed to get filesystem info");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+}
+
+static char *
+entropy(void)
+{
+       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 smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "%d", &num);
+       fclose(fp);
+
+       return smprintf("%d", num);
+}

 
 

-/* set statusbar (WM_NAME) */
-void
-setstatus(char *str)
+static char *
+gid(void)

 {
 {

-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
+       return smprintf("%d", getgid());

 }
 
 }
 

-/* smprintf function */
-char *
-smprintf(char *fmt, ...)
+static char *
+hostname(void)

 {
 {

-    va_list fmtargs;
-    char *ret;
-    int len;
+       char buf[HOST_NAME_MAX];
+
+       if (gethostname(buf, sizeof(buf)) == -1) {
+               warn("hostname");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%s", buf);
+}

 
 

-    va_start(fmtargs, fmt);
-    len = vsnprintf(NULL, 0, fmt, fmtargs);
-    va_end(fmtargs);
+static char *
+ip(const char *iface)
+{
+       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 smprintf(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 smprintf(UNKNOWN_STR);
+                       }
+                       return smprintf("%s", host);
+               }
+       }
+
+       freeifaddrs(ifaddr);
+
+       return smprintf(UNKNOWN_STR);
+}

 
 

-    ret = malloc(++len);
-    if (ret == NULL) {
-        fprintf(stderr, "Malloc error.");
-        exit(1);
-    }
+static char *
+load_avg(void)
+{
+       double avgs[3];

 
 

-    va_start(fmtargs, fmt);
-    vsnprintf(ret, len, fmt, fmtargs);
-    va_end(fmtargs);
+       if (getloadavg(avgs, 3) < 0) {
+               warnx("Failed to get the load avg");
+               return smprintf(UNKNOWN_STR);
+       }

 
 

-    return ret;
+       return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);

 }
 
 }
 

-/* battery percentage */
-char *
-get_battery()
+static char *
+ram_free(void)

 {
 {

-    int now, full, perc;
-    FILE *fp;
+       long free;
+       FILE *fp;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "MemFree: %ld kB\n", &free);
+       fclose(fp);
+
+       return smprintf("%f", (float)free / 1024 / 1024);
+}

 
 

-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        exit(1);
-    }
+static 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 smprintf(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 smprintf("%d%%", 100 * ((total - free) - (buffers + cached)) / total);
+}

 
 

-    /* read value */
-    fscanf(fp, "%i", &now);
+static char *
+ram_total(void)
+{
+       long total;
+       FILE *fp;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "MemTotal: %ld kB\n", &total);
+       fclose(fp);
+
+       return smprintf("%f", (float)total / 1024 / 1024);
+}

 
 

-    /* close battery now file */
-    fclose(fp);
+static char *
+ram_used(void)
+{
+       long free, total, buffers, cached;
+       FILE *fp;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(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 smprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
+}

 
 

-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        exit(1);
-    }
+static char *
+run_command(const char *cmd)
+{
+       char *nlptr;
+       FILE *fp;
+       char buf[1024] = UNKNOWN_STR;
+
+       fp = popen(cmd, "r");
+       if (fp == NULL) {
+               warn("Failed to get command output for %s", cmd);
+               return smprintf(UNKNOWN_STR);
+       }
+       fgets(buf, sizeof(buf), fp);
+       pclose(fp);
+       buf[strlen(buf)] = '\0';
+
+       if ((nlptr = strstr(buf, "\n")) != NULL) {
+               nlptr[0] = '\0';
+       }
+
+       return smprintf("%s", buf);
+}

 
 

-    /* read value */
-    fscanf(fp, "%i", &full);
+static char *
+swap_free(void)
+{
+       long total, free;
+       FILE *fp;
+       char buf[2048];
+       size_t bytes_read;
+       char *match;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+       buf[bytes_read] = '\0';
+       fclose(fp);
+       if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+               warn("Failed to read from /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapTotal");
+       sscanf(match, "SwapTotal: %ld kB\n", &total);
+       if (total == 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapFree");
+       sscanf(match, "SwapFree: %ld kB\n", &free);
+
+       return smprintf("%f", (float)free / 1024 / 1024);
+}

 
 

-    /* close battery full file */
-    fclose(fp);
+static char *
+swap_perc(void)
+{
+       long total, free, cached;
+       FILE *fp;
+       char buf[2048];
+       size_t bytes_read;
+       char *match;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+       buf[bytes_read] = '\0';
+       fclose(fp);
+       if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+               warn("Failed to read from /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapTotal");
+       sscanf(match, "SwapTotal: %ld kB\n", &total);
+       if (total == 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapCached");
+       sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+       match = strstr(buf, "SwapFree");
+       sscanf(match, "SwapFree: %ld kB\n", &free);
+
+       return smprintf("%d%%", 100 * (total - free - cached) / total);
+}
+
+static char *
+swap_total(void)
+{
+       long total;
+       FILE *fp;
+       char buf[2048];
+       size_t bytes_read;
+       char *match;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+       buf[bytes_read] = '\0';
+       fclose(fp);
+       if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+               warn("Failed to read from /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapTotal");
+       sscanf(match, "SwapTotal: %ld kB\n", &total);
+       if (total == 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       return smprintf("%f", (float)total / 1024 / 1024);
+}

 
 

-    /* calculate percent */
-    perc = now / (full / 100);
+static char *
+swap_used(void)
+{
+       long total, free, cached;
+       FILE *fp;
+       char buf[2048];
+       size_t bytes_read;
+       char *match;
+
+       fp = fopen("/proc/meminfo", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+       bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+       buf[bytes_read] = '\0';
+       fclose(fp);
+       if (bytes_read == 0 || bytes_read == sizeof(buf)) {
+               warn("Failed to read from /proc/meminfo");
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapTotal");
+       sscanf(match, "SwapTotal: %ld kB\n", &total);
+       if (total == 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       match = strstr(buf, "SwapCached");
+       sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+       match = strstr(buf, "SwapFree");
+       sscanf(match, "SwapFree: %ld kB\n", &free);
+
+       return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
+}

 
 

-    /* return perc as string */
-    return smprintf("%d%%", perc);
+static char *
+temp(const char *file)
+{
+       int temp;
+       FILE *fp;
+
+       fp = fopen(file, "r");
+       if (fp == NULL) {
+               warn("Failed to open file %s", file);
+               return smprintf(UNKNOWN_STR);
+       }
+       fscanf(fp, "%d", &temp);
+       fclose(fp);
+
+       return smprintf("%d°C", temp / 1000);

 }
 
 }
 

-/* cpu temperature */
-char *
-get_cpu_temperature()
+static char *
+uptime(void)

 {
 {

-    int temperature;
-    FILE *fp;
+       struct sysinfo info;
+       int h = 0;
+       int m = 0;

 
 

-    /* open temperature file */
-    if (!(fp = fopen(tempfile, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        exit(1);
-    }
+       sysinfo(&info);
+       h = info.uptime / 3600;
+       m = (info.uptime - h * 3600 ) / 60;

 
 

-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+       return smprintf("%dh %dm", h, m);
+}
+
+static char *
+username(void)
+{
+       uid_t uid = geteuid();
+       struct passwd *pw = getpwuid(uid);

 
 

-    /* close temperature file */
-    fclose(fp);
+       if (pw == NULL) {
+               warn("Failed to get username");
+               return smprintf(UNKNOWN_STR);
+       }

 
 

-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+       return smprintf("%s", pw->pw_name);

 }
 
 }
 

-/* cpu percentage */
-char *
-get_cpu_usage()
+static char *
+uid(void)

 {
 {

-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+       return smprintf("%d", geteuid());
+}

 
 

-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        exit(1);
-    }

 
 

-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+static char *
+vol_perc(const char *card)
+{
+       int mute;
+       long int vol, max, min;
+       snd_mixer_t *handle;
+       snd_mixer_elem_t *elem;
+       snd_mixer_selem_id_t *s_elem;
+
+       snd_mixer_open(&handle, 0);
+       snd_mixer_attach(handle, card);
+       snd_mixer_selem_register(handle, NULL, NULL);
+       snd_mixer_load(handle);
+       snd_mixer_selem_id_malloc(&s_elem);
+       snd_mixer_selem_id_set_name(s_elem, "Master");
+       elem = snd_mixer_find_selem(handle, s_elem);
+
+       if (elem == NULL) {
+               snd_mixer_selem_id_free(s_elem);
+               snd_mixer_close(handle);
+               warn("Failed to get volume percentage for %s", card);
+               return smprintf(UNKNOWN_STR);
+       }
+
+       snd_mixer_handle_events(handle);
+       snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
+       snd_mixer_selem_get_playback_volume(elem, 0, &vol);
+       snd_mixer_selem_get_playback_switch(elem, 0, &mute);
+
+       snd_mixer_selem_id_free(s_elem);
+       snd_mixer_close(handle);
+
+       if (!mute)
+               return smprintf("mute");
+       else if (max == 0)
+               return smprintf("0%%");
+       else
+               return smprintf("%lu%%", ((uint_fast16_t)(vol * 100) / max));
+}

 
 

-    /* close stat file */
-    fclose(fp);
+static char *
+wifi_perc(const char *iface)
+{
+       int perc;
+       char buf[255];
+       char *datastart;
+       char status[5];
+       FILE *fp;
+
+       ccat(3, "/sys/class/net/", iface, "/operstate");
+       fp = fopen(concat, "r");
+       if (fp == NULL) {
+               warn("Failed to open file %s", concat);
+               return smprintf(UNKNOWN_STR);
+       }
+       fgets(status, 5, fp);
+       fclose(fp);
+       if(strcmp(status, "up\n") != 0) {
+               return smprintf(UNKNOWN_STR);
+       }
+
+       fp = fopen("/proc/net/wireless", "r");
+       if (fp == NULL) {
+               warn("Failed to open file /proc/net/wireless");
+               return smprintf(UNKNOWN_STR);
+       }
+       ccat(2, iface, ":");
+       fgets(buf, sizeof(buf), fp);
+       fgets(buf, sizeof(buf), fp);
+       fgets(buf, sizeof(buf), fp);
+       fclose(fp);
+
+       datastart = strstr(buf, concat);
+       if (datastart != NULL) {
+               datastart = strstr(buf, ":");
+               sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
+       }
+
+       return smprintf("%d%%", perc);
+}

 
 

-    /* wait a second (for avg values) */
-    sleep(1);
+static char *
+wifi_essid(const char *iface)
+{
+       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;
+       sprintf(wreq.ifr_name, iface);
+       if (sockfd == -1) {
+               warn("Failed to get ESSID for interface %s", iface);
+               return smprintf(UNKNOWN_STR);
+       }
+       wreq.u.essid.pointer = id;
+       if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+               warn("Failed to get ESSID for interface %s", iface);
+               return smprintf(UNKNOWN_STR);
+       }
+
+       close(sockfd);
+
+       if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
+               return smprintf(UNKNOWN_STR);
+       else
+               return smprintf("%s", (char *)wreq.u.essid.pointer);
+}

 
 

-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        exit(1);
-    }
+static char *
+kernel_release(void)
+{
+       struct utsname udata;
+       if (uname(&udata) < 0)
+               return smprintf(UNKNOWN_STR);

 
 

-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+       return smprintf("%s", udata.release);
+}

 
 

-    /* close stat file */
-    fclose(fp);
+static void
+set_status(const char *str)
+{
+       XStoreName(dpy, DefaultRootWindow(dpy), str);
+       XSync(dpy, False);
+}

 
 

-    /* 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]));
+static void
+sighandler(const int signo)
+{
+       if (signo == SIGTERM || signo == SIGINT) {
+               done = 1;
+       }
+}
+
+static void
+usage(void)
+{
+       fprintf(stderr, "usage: %s [-dhov]\n", argv0);
+       exit(1);
+}

 
 

-    /* return perc as string */
-    return smprintf("%d%%", perc);
-}
-
-/* date and time */
-char *
-get_datetime()
-{
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
-
-    /* get time in format */
-    time(&tm);
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-      fprintf(stderr, "Strftime failed.\n");
-        exit(1);
-    }
-
-    /* return time */
-    return smprintf("%s", buf);
-}
-
-/* ram percentage */
-char *
-get_ram_usage()
-{
-    int perc;
-    long total, free, buffers, cached;
-    FILE *fp;
-
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        exit(1);
-    }
-
-    /* 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()
-{
-    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()
-{
-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path_start[16] = "/sys/class/net/";
-    char path_end[11] = "/operstate";
-    char path[32];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
-
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, path_start);
-    strcat(path, wificard);
-    strcat(path, path_end);
-
-    /* open wifi file */
-    if(!(fp = fopen(path, "r"))) {
-        fprintf(stderr, "Error opening wifi operstate file.");
-        exit(1);
-    }
-
-    /* read the status */
-    fgets(status, 5, fp);
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* check if interface down */
-    if(strcmp(status, "up\n") != 0){
-        return "n/a";
-    }
-
-    /* open wifi file */
-    if (!(fp = fopen("/proc/net/wireless", "r"))) {
-        fprintf(stderr, "Error opening wireless file.");
-        exit(1);
-    }
-
-    /* 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
 int

-main()
-{
-    char status[1024];
-    char *battery = NULL;
-    char *cpu_temperature = NULL;
-    char *cpu_usage = NULL;
-    char *datetime = NULL;
-    char *ram_usage = NULL;
-    char *volume = NULL;
-    char *wifi_signal = NULL;
-
-    /* open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
-
-    /* return status every second */
-    for (;;) {
-        /* assign the values */
-        battery = get_battery();
-        cpu_temperature = get_cpu_temperature();
-        cpu_usage = get_cpu_usage();
-        datetime = get_datetime();
-        ram_usage = get_ram_usage();
-        volume = get_volume();
-        wifi_signal = get_wifi_signal();
-
-        /* return the status */
-        sprintf(status, FORMATSTRING, ARGUMENTS);
-        setstatus(status);
-
-        /* free the values */
-        free(battery);
-        free(cpu_temperature);
-        free(cpu_usage);
-        free(datetime);
-        free(ram_usage);
-        free(volume);
-        free(wifi_signal);
-    }
-
-    /* close display */
-    XCloseDisplay(dpy);
-
-    /* exit successfully */
-    return 0;
+main(int argc, char *argv[])
+{
+       unsigned short int i;
+       char status_string[2048];
+       char *res, *element;
+       struct arg argument;
+       struct sigaction act;
+
+       ARGBEGIN {
+               case 'd':
+                       dflag = 1;
+                       break;
+               case 'o':
+                       oflag = 1;
+                       break;
+               case 'v':
+                       printf("slstatus %s (C) 2016 slstatus engineers\n", VERSION);
+                       return 0;
+               default:
+                       usage();
+       } ARGEND
+
+       if (dflag && oflag) {
+               usage();
+       }
+       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 (i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
+                       argument = args[i];
+                       if (argument.args == NULL) {
+                               res = argument.func();
+                       } else {
+                               res = argument.func(argument.args);
+                       }
+                       element = smprintf(argument.fmt, res);
+                       if (element == NULL) {
+                               element = smprintf(UNKNOWN_STR);
+                               warnx("Failed to format output");
+                       }
+                       if (strlcat(status_string, element, sizeof(status_string)) >= sizeof(status_string))
+                               warnx("Output too long");
+                       free(res);
+                       free(element);
+               }
+
+               if (!oflag) {
+                       set_status(status_string);
+               } else {
+                       printf("%s\n", status_string);
+               }
+
+               /*
+                * subtract delay time spend in function
+                * calls from the actual global delay time
+                */
+               sleep(UPDATE_INTERVAL - delay);
+               delay = 0;
+       }
+
+       if (!oflag) {
+               set_status(NULL);
+               XCloseDisplay(dpy);
+       }
+
+       return 0;

 }
 }