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