slstatus/slstatus.c

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C
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/* See LICENSE file for copyright and license details. */
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/* global libraries */
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#include <alsa/asoundlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xlib.h>
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/* local libraries */
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#include "config.h"
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/* functions */
void setstatus(char *str);
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char *smprintf(char *fmt, ...);
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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();
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/* global variables */
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static Display *dpy;
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/* set statusbar (WM_NAME) */
void
setstatus(char *str)
{
XStoreName(dpy, DefaultRootWindow(dpy), str);
XSync(dpy, False);
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}
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/* smprintf function */
char *
smprintf(char *fmt, ...)
{
va_list fmtargs;
char *ret;
int len;
va_start(fmtargs, fmt);
len = vsnprintf(NULL, 0, fmt, fmtargs);
va_end(fmtargs);
ret = malloc(++len);
if (ret == NULL) {
fprintf(stderr, "Malloc error.");
exit(1);
}
va_start(fmtargs, fmt);
vsnprintf(ret, len, fmt, fmtargs);
va_end(fmtargs);
return ret;
}
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/* battery percentage */
char *
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get_battery()
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{
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int now, full, perc;
FILE *fp;
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/* open battery now file */
if (!(fp = fopen(batterynowfile, "r"))) {
fprintf(stderr, "Error opening battery file.");
exit(1);
}
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/* read value */
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fscanf(fp, "%i", &now);
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/* close battery now file */
fclose(fp);
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/* open battery full file */
if (!(fp = fopen(batteryfullfile, "r"))) {
fprintf(stderr, "Error opening battery file.");
exit(1);
}
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/* read value */
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fscanf(fp, "%i", &full);
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/* close battery full file */
fclose(fp);
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/* calculate percent */
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perc = now / (full / 100);
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/* return perc as string */
return smprintf("%d%%", perc);
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}
/* cpu temperature */
char *
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get_cpu_temperature()
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{
int temperature;
FILE *fp;
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/* open temperature file */
if (!(fp = fopen(tempfile, "r"))) {
fprintf(stderr, "Could not open temperature file.\n");
exit(1);
}
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/* extract temperature */
fscanf(fp, "%d", &temperature);
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/* close temperature file */
fclose(fp);
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/* return temperature in degrees */
return smprintf("%d°C", temperature / 1000);
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}
/* cpu percentage */
char *
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get_cpu_usage()
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{
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int perc;
long double a[4], b[4];
FILE *fp;
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/* open stat file */
if (!(fp = fopen("/proc/stat","r"))) {
fprintf(stderr, "Error opening stat file.");
exit(1);
}
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/* read values */
fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
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/* close stat file */
fclose(fp);
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/* wait a second (for avg values) */
sleep(1);
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/* open stat file */
if (!(fp = fopen("/proc/stat","r"))) {
fprintf(stderr, "Error opening stat file.");
exit(1);
}
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/* read values */
fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
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/* close stat file */
fclose(fp);
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/* calculate avg in this second */
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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]));
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/* return perc as string */
return smprintf("%d%%", perc);
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}
/* date and time */
char *
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get_datetime()
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{
time_t tm;
size_t bufsize = 19;
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 */
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return smprintf("%s", buf);
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}
/* ram percentage */
char *
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get_ram_usage()
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{
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int perc;
long total, free, buffers, cached;
FILE *fp;
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/* open meminfo file */
if (!(fp = fopen("/proc/meminfo", "r"))) {
fprintf(stderr, "Error opening meminfo file.");
exit(1);
}
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/* 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);
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/* close meminfo file */
fclose(fp);
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/* calculate percentage */
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perc = 100 * ((total - free) - (buffers + cached)) / total;
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/* return perc as string */
return smprintf("%d%%", perc);
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}
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/* alsa volume percentage */
char *
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get_volume()
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{
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);
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}
/* wifi percentage */
char *
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get_wifi_signal()
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{
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);
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}
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/* main function */
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int
main()
{
char status[1024];
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char *battery = NULL;
char *cpu_temperature = NULL;
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char *cpu_usage = NULL;
char *datetime = NULL;
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char *ram_usage = NULL;
char *volume = NULL;
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char *wifi_signal = NULL;
/* open display */
if (!(dpy = XOpenDisplay(0x0))) {
fprintf(stderr, "Cannot open display!\n");
exit(1);
}
/* return status every second */
for (;;) {
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/* assign the values */
battery = get_battery();
cpu_temperature = get_cpu_temperature();
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cpu_usage = get_cpu_usage();
datetime = get_datetime();
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ram_usage = get_ram_usage();
volume = get_volume();
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wifi_signal = get_wifi_signal();
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/* return the status */
sprintf(status, FORMATSTRING, ARGUMENTS);
setstatus(status);
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/* free the values */
free(battery);
free(cpu_temperature);
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free(cpu_usage);
free(datetime);
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free(ram_usage);
free(volume);
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free(wifi_signal);
}
/* close display */
XCloseDisplay(dpy);
/* exit successfully */
return 0;
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}