slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 /* global libraries */
   4 #include <alsa/asoundlib.h>
   5 #include <fcntl.h>
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <time.h>
  13 #include <unistd.h>
  14 #include <X11/Xlib.h>
  15
  16 /* local libraries */
  17 #include "config.h"
  18
  19 /* check file macro */
  20 #define CHECK_FILE(X,Y) do { \
  21     if (stat(X,&Y) < 0) return -1; \
  22     if (!S_ISREG(Y.st_mode)) return -1; \
  23 } while (0);
  24
  25 /* functions */
  26 int config_check();
  27 void setstatus(char *str);
  28 char *smprintf(char *fmt, ...);
  29 char *get_battery();
  30 char *get_cpu_temperature();
  31 char *get_cpu_usage();
  32 char *get_datetime();
  33 char *get_ram_usage();
  34 char *get_volume();
  35 char *get_wifi_signal();
  36
  37 /* global variables */
  38 static Display *dpy;
  39
  40 /* check configured paths */
  41 int
  42 config_check()
  43 {
  44     struct stat fs;
  45     CHECK_FILE(batterynowfile, fs);
  46     CHECK_FILE(batteryfullfile, fs);
  47     CHECK_FILE(tempfile, fs);
  48     return 0;
  49 }
  50
  51 /* set statusbar (WM_NAME) */
  52 void
  53 setstatus(char *str)
  54 {
  55     XStoreName(dpy, DefaultRootWindow(dpy), str);
  56     XSync(dpy, False);
  57 }
  58
  59 /* smprintf function */
  60 char *
  61 smprintf(char *fmt, ...)
  62 {
  63     va_list fmtargs;
  64     char *ret = NULL;
  65     va_start(fmtargs, fmt);
  66     if (vasprintf(&ret, fmt, fmtargs) < 0)
  67         return NULL;
  68     va_end(fmtargs);
  69
  70     return ret;
  71 }
  72
  73 /* battery percentage */
  74 char *
  75 get_battery()
  76 {
  77     int now, full, perc;
  78     FILE *fp;
  79
  80     /* open battery now file */
  81     if (!(fp = fopen(batterynowfile, "r"))) {
  82         fprintf(stderr, "Error opening battery file.");
  83         return smprintf("n/a");
  84     }
  85
  86     /* read value */
  87     fscanf(fp, "%i", &now);
  88
  89     /* close battery now file */
  90     fclose(fp);
  91
  92     /* open battery full file */
  93     if (!(fp = fopen(batteryfullfile, "r"))) {
  94         fprintf(stderr, "Error opening battery file.");
  95         return smprintf("n/a");
  96     }
  97
  98     /* read value */
  99     fscanf(fp, "%i", &full);
 100
 101     /* close battery full file */
 102     fclose(fp);
 103
 104     /* calculate percent */
 105     perc = now / (full / 100);
 106
 107     /* return perc as string */
 108     return smprintf("%d%%", perc);
 109 }
 110
 111 /* cpu temperature */
 112 char *
 113 get_cpu_temperature()
 114 {
 115     int temperature;
 116     FILE *fp;
 117
 118     /* open temperature file */
 119     if (!(fp = fopen(tempfile, "r"))) {
 120         fprintf(stderr, "Could not open temperature file.\n");
 121         return smprintf("n/a");
 122     }
 123
 124     /* extract temperature */
 125     fscanf(fp, "%d", &temperature);
 126
 127     /* close temperature file */
 128     fclose(fp);
 129
 130     /* return temperature in degrees */
 131     return smprintf("%d°C", temperature / 1000);
 132 }
 133
 134 /* cpu percentage */
 135 char *
 136 get_cpu_usage()
 137 {
 138     int perc;
 139     long double a[4], b[4];
 140     FILE *fp;
 141
 142     /* open stat file */
 143     if (!(fp = fopen("/proc/stat","r"))) {
 144         fprintf(stderr, "Error opening stat file.");
 145         return smprintf("n/a");
 146     }
 147
 148     /* read values */
 149     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 150
 151     /* close stat file */
 152     fclose(fp);
 153
 154     /* wait a second (for avg values) */
 155     sleep(1);
 156
 157     /* open stat file */
 158     if (!(fp = fopen("/proc/stat","r"))) {
 159         fprintf(stderr, "Error opening stat file.");
 160         return smprintf("n/a");
 161     }
 162
 163     /* read values */
 164     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 165
 166     /* close stat file */
 167     fclose(fp);
 168
 169     /* calculate avg in this second */
 170     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]));
 171
 172     /* return perc as string */
 173     return smprintf("%d%%", perc);
 174 }
 175
 176 /* date and time */
 177 char *
 178 get_datetime()
 179 {
 180     time_t tm;
 181     size_t bufsize = 64;
 182     char *buf = malloc(bufsize);
 183
 184     /* get time in format */
 185     time(&tm);
 186     if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
 187         fprintf(stderr, "Strftime failed.\n");
 188         return smprintf("n/a");
 189     }
 190
 191     /* return time */
 192     return smprintf("%s", buf);
 193 }
 194
 195 /* ram percentage */
 196 char *
 197 get_ram_usage()
 198 {
 199     int perc;
 200     long total, free, buffers, cached;
 201     FILE *fp;
 202
 203     /* open meminfo file */
 204     if (!(fp = fopen("/proc/meminfo", "r"))) {
 205         fprintf(stderr, "Error opening meminfo file.");
 206         return smprintf("n/a");
 207     }
 208
 209     /* read the values */
 210     fscanf(fp, "MemTotal: %ld kB\n", &total);
 211     fscanf(fp, "MemFree: %ld kB\n", &free);
 212     fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 213     fscanf(fp, "Cached: %ld kB\n", &cached);
 214
 215     /* close meminfo file */
 216     fclose(fp);
 217
 218     /* calculate percentage */
 219     perc = 100 * ((total - free) - (buffers + cached)) / total;
 220
 221     /* return perc as string */
 222     return smprintf("%d%%", perc);
 223 }
 224
 225 /* alsa volume percentage */
 226 char *
 227 get_volume()
 228 {
 229     int mute = 0;
 230     long vol = 0, max = 0, min = 0;
 231
 232     /* get volume from alsa */
 233     snd_mixer_t *handle;
 234     snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 235     snd_mixer_selem_id_t *vol_info, *mute_info;
 236     snd_mixer_open(&handle, 0);
 237     snd_mixer_attach(handle, soundcard);
 238     snd_mixer_selem_register(handle, NULL, NULL);
 239     snd_mixer_load(handle);
 240     snd_mixer_selem_id_malloc(&vol_info);
 241     snd_mixer_selem_id_malloc(&mute_info);
 242     snd_mixer_selem_id_set_name(vol_info, channel);
 243     snd_mixer_selem_id_set_name(mute_info, channel);
 244     pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 245     mas_mixer = snd_mixer_find_selem(handle, mute_info);
 246     snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 247     snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 248     snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 249     if (vol_info)
 250         snd_mixer_selem_id_free(vol_info);
 251     if (mute_info)
 252         snd_mixer_selem_id_free(mute_info);
 253     if (handle)
 254         snd_mixer_close(handle);
 255
 256     /* return the string (mute) */
 257     if (!mute)
 258         return smprintf("mute");
 259     else
 260         return smprintf("%d%%", (vol * 100) / max);
 261 }
 262
 263 /* wifi percentage */
 264 char *
 265 get_wifi_signal()
 266 {
 267     int bufsize = 255;
 268     int strength;
 269     char buf[bufsize];
 270     char *datastart;
 271     char path_start[16] = "/sys/class/net/";
 272     char path_end[11] = "/operstate";
 273     char path[32];
 274     char status[5];
 275     char needle[sizeof wificard + 1];
 276     FILE *fp;
 277
 278     /* generate the path name */
 279     memset(path, 0, sizeof path);
 280     strcat(path, path_start);
 281     strcat(path, wificard);
 282     strcat(path, path_end);
 283
 284     /* open wifi file */
 285     if(!(fp = fopen(path, "r"))) {
 286         fprintf(stderr, "Error opening wifi operstate file.");
 287         return smprintf("n/a");
 288     }
 289
 290     /* read the status */
 291     fgets(status, 5, fp);
 292
 293     /* close wifi file */
 294     fclose(fp);
 295
 296     /* check if interface down */
 297     if(strcmp(status, "up\n") != 0){
 298         return smprintf("n/a");
 299     }
 300
 301     /* open wifi file */
 302     if (!(fp = fopen("/proc/net/wireless", "r"))) {
 303         fprintf(stderr, "Error opening wireless file.");
 304         return smprintf("n/a");
 305     }
 306
 307     /* extract the signal strength */
 308     strcpy(needle, wificard);
 309     strcat(needle, ":");
 310     fgets(buf, bufsize, fp);
 311     fgets(buf, bufsize, fp);
 312     fgets(buf, bufsize, fp);
 313     if ((datastart = strstr(buf, needle)) != NULL) {
 314         datastart = strstr(buf, ":");
 315         sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
 316     }
 317
 318     /* close wifi file */
 319     fclose(fp);
 320
 321     /* return strength in percent */
 322     return smprintf("%d%%", strength);
 323 }
 324
 325 /* main function */
 326 int
 327 main()
 328 {
 329     char status[1024];
 330     char *battery = NULL;
 331     char *cpu_temperature = NULL;
 332     char *cpu_usage = NULL;
 333     char *datetime = NULL;
 334     char *ram_usage = NULL;
 335     char *volume = NULL;
 336     char *wifi_signal = NULL;
 337
 338     /* check config for sanity */
 339     if (config_check() < 0) {
 340         fprintf(stderr, "Config error, please check paths and recompile\n");
 341         exit(1);
 342     }
 343
 344     /* open display */
 345     if (!(dpy = XOpenDisplay(0x0))) {
 346         fprintf(stderr, "Cannot open display!\n");
 347         exit(1);
 348     }
 349
 350     /* return status every second */
 351     for (;;) {
 352         /* assign the values */
 353         battery = get_battery();
 354         cpu_temperature = get_cpu_temperature();
 355         cpu_usage = get_cpu_usage();
 356         datetime = get_datetime();
 357         ram_usage = get_ram_usage();
 358         volume = get_volume();
 359         wifi_signal = get_wifi_signal();
 360
 361         /* return the status */
 362         sprintf(status, FORMATSTRING, ARGUMENTS);
 363         setstatus(status);
 364
 365         /* free the values */
 366         free(battery);
 367         free(cpu_temperature);
 368         free(cpu_usage);
 369         free(datetime);
 370         free(ram_usage);
 371         free(volume);
 372         free(wifi_signal);
 373
 374         /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 375         sleep(update_interval -1);
 376     }
 377
 378     /* close display */
 379     XCloseDisplay(dpy);
 380
 381     /* exit successfully */
 382     return 0;
 383 }