slstatus.c

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