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
  46     /* check all files in the config.h file */
  47     CHECK_FILE(batterynowfile, fs);
  48     CHECK_FILE(batteryfullfile, fs);
  49     CHECK_FILE(tempfile, fs);
  50
  51     /* check update interval */
  52     if (update_interval < 1)
  53         return -1;
  54
  55     /* exit successfully */
  56     return 0;
  57 }
  58
  59 /* set statusbar (WM_NAME) */
  60 void
  61 setstatus(char *str)
  62 {
  63     XStoreName(dpy, DefaultRootWindow(dpy), str);
  64     XSync(dpy, False);
  65 }
  66
  67 /* smprintf function */
  68 char *
  69 smprintf(char *fmt, ...)
  70 {
  71     va_list fmtargs;
  72     char *ret = NULL;
  73     va_start(fmtargs, fmt);
  74     if (vasprintf(&ret, fmt, fmtargs) < 0)
  75         return NULL;
  76     va_end(fmtargs);
  77
  78     return ret;
  79 }
  80
  81 /* battery percentage */
  82 char *
  83 get_battery()
  84 {
  85     int now, full, perc;
  86     FILE *fp;
  87
  88     /* open battery now file */
  89     if (!(fp = fopen(batterynowfile, "r"))) {
  90         fprintf(stderr, "Error opening battery file.");
  91         return smprintf("n/a");
  92     }
  93
  94     /* read value */
  95     fscanf(fp, "%i", &now);
  96
  97     /* close battery now file */
  98     fclose(fp);
  99
 100     /* open battery full file */
 101     if (!(fp = fopen(batteryfullfile, "r"))) {
 102         fprintf(stderr, "Error opening battery file.");
 103         return smprintf("n/a");
 104     }
 105
 106     /* read value */
 107     fscanf(fp, "%i", &full);
 108
 109     /* close battery full file */
 110     fclose(fp);
 111
 112     /* calculate percent */
 113     perc = now / (full / 100);
 114
 115     /* return perc as string */
 116     return smprintf("%d%%", perc);
 117 }
 118
 119 /* cpu temperature */
 120 char *
 121 get_cpu_temperature()
 122 {
 123     int temperature;
 124     FILE *fp;
 125
 126     /* open temperature file */
 127     if (!(fp = fopen(tempfile, "r"))) {
 128         fprintf(stderr, "Could not open temperature file.\n");
 129         return smprintf("n/a");
 130     }
 131
 132     /* extract temperature */
 133     fscanf(fp, "%d", &temperature);
 134
 135     /* close temperature file */
 136     fclose(fp);
 137
 138     /* return temperature in degrees */
 139     return smprintf("%d°C", temperature / 1000);
 140 }
 141
 142 /* cpu percentage */
 143 char *
 144 get_cpu_usage()
 145 {
 146     int perc;
 147     long double a[4], b[4];
 148     FILE *fp;
 149
 150     /* open stat file */
 151     if (!(fp = fopen("/proc/stat","r"))) {
 152         fprintf(stderr, "Error opening stat file.");
 153         return smprintf("n/a");
 154     }
 155
 156     /* read values */
 157     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 158
 159     /* close stat file */
 160     fclose(fp);
 161
 162     /* wait a second (for avg values) */
 163     sleep(1);
 164
 165     /* open stat file */
 166     if (!(fp = fopen("/proc/stat","r"))) {
 167         fprintf(stderr, "Error opening stat file.");
 168         return smprintf("n/a");
 169     }
 170
 171     /* read values */
 172     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 173
 174     /* close stat file */
 175     fclose(fp);
 176
 177     /* calculate avg in this second */
 178     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]));
 179
 180     /* return perc as string */
 181     return smprintf("%d%%", perc);
 182 }
 183
 184 /* date and time */
 185 char *
 186 get_datetime()
 187 {
 188     time_t tm;
 189     size_t bufsize = 64;
 190     char *buf = malloc(bufsize);
 191
 192     /* get time in format */
 193     time(&tm);
 194     if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
 195         fprintf(stderr, "Strftime failed.\n");
 196         return smprintf("n/a");
 197     }
 198
 199     /* return time */
 200     return smprintf("%s", buf);
 201 }
 202
 203 /* ram percentage */
 204 char *
 205 get_ram_usage()
 206 {
 207     int perc;
 208     long total, free, buffers, cached;
 209     FILE *fp;
 210
 211     /* open meminfo file */
 212     if (!(fp = fopen("/proc/meminfo", "r"))) {
 213         fprintf(stderr, "Error opening meminfo file.");
 214         return smprintf("n/a");
 215     }
 216
 217     /* read the values */
 218     fscanf(fp, "MemTotal: %ld kB\n", &total);
 219     fscanf(fp, "MemFree: %ld kB\n", &free);
 220     fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 221     fscanf(fp, "Cached: %ld kB\n", &cached);
 222
 223     /* close meminfo file */
 224     fclose(fp);
 225
 226     /* calculate percentage */
 227     perc = 100 * ((total - free) - (buffers + cached)) / total;
 228
 229     /* return perc as string */
 230     return smprintf("%d%%", perc);
 231 }
 232
 233 /* alsa volume percentage */
 234 char *
 235 get_volume()
 236 {
 237     int mute = 0;
 238     long vol = 0, max = 0, min = 0;
 239
 240     /* get volume from alsa */
 241     snd_mixer_t *handle;
 242     snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 243     snd_mixer_selem_id_t *vol_info, *mute_info;
 244     snd_mixer_open(&handle, 0);
 245     snd_mixer_attach(handle, soundcard);
 246     snd_mixer_selem_register(handle, NULL, NULL);
 247     snd_mixer_load(handle);
 248     snd_mixer_selem_id_malloc(&vol_info);
 249     snd_mixer_selem_id_malloc(&mute_info);
 250     snd_mixer_selem_id_set_name(vol_info, channel);
 251     snd_mixer_selem_id_set_name(mute_info, channel);
 252     pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 253     mas_mixer = snd_mixer_find_selem(handle, mute_info);
 254     snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 255     snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 256     snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 257     if (vol_info)
 258         snd_mixer_selem_id_free(vol_info);
 259     if (mute_info)
 260         snd_mixer_selem_id_free(mute_info);
 261     if (handle)
 262         snd_mixer_close(handle);
 263
 264     /* return the string (mute) */
 265     if (!mute)
 266         return smprintf("mute");
 267     else
 268         return smprintf("%d%%", (vol * 100) / max);
 269 }
 270
 271 /* wifi percentage */
 272 char *
 273 get_wifi_signal()
 274 {
 275     int bufsize = 255;
 276     int strength;
 277     char buf[bufsize];
 278     char *datastart;
 279     char path_start[16] = "/sys/class/net/";
 280     char path_end[11] = "/operstate";
 281     char path[32];
 282     char status[5];
 283     char needle[sizeof wificard + 1];
 284     FILE *fp;
 285
 286     /* generate the path name */
 287     memset(path, 0, sizeof path);
 288     strcat(path, path_start);
 289     strcat(path, wificard);
 290     strcat(path, path_end);
 291
 292     /* open wifi file */
 293     if(!(fp = fopen(path, "r"))) {
 294         fprintf(stderr, "Error opening wifi operstate file.");
 295         return smprintf("n/a");
 296     }
 297
 298     /* read the status */
 299     fgets(status, 5, fp);
 300
 301     /* close wifi file */
 302     fclose(fp);
 303
 304     /* check if interface down */
 305     if(strcmp(status, "up\n") != 0){
 306         return smprintf("n/a");
 307     }
 308
 309     /* open wifi file */
 310     if (!(fp = fopen("/proc/net/wireless", "r"))) {
 311         fprintf(stderr, "Error opening wireless file.");
 312         return smprintf("n/a");
 313     }
 314
 315     /* extract the signal strength */
 316     strcpy(needle, wificard);
 317     strcat(needle, ":");
 318     fgets(buf, bufsize, fp);
 319     fgets(buf, bufsize, fp);
 320     fgets(buf, bufsize, fp);
 321     if ((datastart = strstr(buf, needle)) != NULL) {
 322         datastart = strstr(buf, ":");
 323         sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
 324     }
 325
 326     /* close wifi file */
 327     fclose(fp);
 328
 329     /* return strength in percent */
 330     return smprintf("%d%%", strength);
 331 }
 332
 333 /* main function */
 334 int
 335 main()
 336 {
 337     char status[1024];
 338     char *battery = NULL;
 339     char *cpu_temperature = NULL;
 340     char *cpu_usage = NULL;
 341     char *datetime = NULL;
 342     char *ram_usage = NULL;
 343     char *volume = NULL;
 344     char *wifi_signal = NULL;
 345
 346     /* check config for sanity */
 347     if (config_check() < 0) {
 348         fprintf(stderr, "Config error, please check paths and interval and recompile!\n");
 349         exit(1);
 350     }
 351
 352     /* open display */
 353     if (!(dpy = XOpenDisplay(0x0))) {
 354         fprintf(stderr, "Cannot open display!\n");
 355         exit(1);
 356     }
 357
 358     /* return status every second */
 359     for (;;) {
 360         /* assign the values */
 361         battery = get_battery();
 362         cpu_temperature = get_cpu_temperature();
 363         cpu_usage = get_cpu_usage();
 364         datetime = get_datetime();
 365         ram_usage = get_ram_usage();
 366         volume = get_volume();
 367         wifi_signal = get_wifi_signal();
 368
 369         /* return the status */
 370         sprintf(status, FORMATSTRING, ARGUMENTS);
 371         setstatus(status);
 372
 373         /* free the values */
 374         free(battery);
 375         free(cpu_temperature);
 376         free(cpu_usage);
 377         free(datetime);
 378         free(ram_usage);
 379         free(volume);
 380         free(wifi_signal);
 381
 382         /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 383         sleep(update_interval -1);
 384     }
 385
 386     /* close display */
 387     XCloseDisplay(dpy);
 388
 389     /* exit successfully */
 390     return 0;
 391 }