slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 #include <alsa/asoundlib.h>
   4 #include <err.h>
   5 #include <fcntl.h>
   6 #include <ifaddrs.h>
   7 #include <limits.h>
   8 #include <linux/wireless.h>
   9 #include <locale.h>
  10 #include <netdb.h>
  11 #include <pwd.h>
  12 #include <signal.h>
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/stat.h>
  19 #include <sys/statvfs.h>
  20 #include <sys/socket.h>
  21 #include <sys/sysinfo.h>
  22 #include <sys/types.h>
  23 #include <sys/utsname.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <X11/Xlib.h>
  27
  28 #undef strlcat
  29
  30 #include "extern/arg.h"
  31 #include "extern/strlcat.h"
  32 #include "extern/concat.h"
  33
  34 struct arg {
  35         char *(*func)();
  36         const char *fmt;
  37         const char *args;
  38 };
  39
  40 static char *smprintf(const char *fmt, ...);
  41 static char *battery_perc(const char *bat);
  42 static char *battery_state(const char *bat);
  43 static char *cpu_perc(void);
  44 static char *datetime(const char *fmt);
  45 static char *disk_free(const char *mnt);
  46 static char *disk_perc(const char *mnt);
  47 static char *disk_total(const char *mnt);
  48 static char *disk_used(const char *mnt);
  49 static char *entropy(void);
  50 static char *gid(void);
  51 static char *hostname(void);
  52 static char *ip(const char *iface);
  53 static char *kernel_release(void);
  54 static char *load_avg(void);
  55 static char *ram_free(void);
  56 static char *ram_perc(void);
  57 static char *ram_used(void);
  58 static char *ram_total(void);
  59 static char *run_command(const char *cmd);
  60 static char *swap_free(void);
  61 static char *swap_perc(void);
  62 static char *swap_used(void);
  63 static char *swap_total(void);
  64 static char *temp(const char *file);
  65 static char *uid(void);
  66 static char *uptime(void);
  67 static char *username(void);
  68 static char *vol_perc(const char *card);
  69 static char *wifi_perc(const char *iface);
  70 static char *wifi_essid(const char *iface);
  71 static void sighandler(const int signo);
  72 static void usage(int);
  73
  74 char *argv0;
  75 char concat[];
  76 static unsigned short int delay = 0;
  77 static unsigned short int done;
  78 static unsigned short int dflag, oflag;
  79 static Display *dpy;
  80
  81 #include "config.h"
  82
  83 static char *
  84 smprintf(const char *fmt, ...)
  85 {
  86         va_list ap;
  87         char *ret;
  88         int len;
  89
  90         va_start(ap, fmt);
  91         len = vsnprintf(NULL, 0, fmt, ap);
  92         va_end(ap);
  93
  94         ret = malloc(++len);
  95         if (ret == NULL) {
  96                 err(1, "malloc");
  97         }
  98
  99         va_start(ap, fmt);
 100         vsnprintf(ret, len, fmt, ap);
 101         va_end(ap);
 102
 103         return ret;
 104 }
 105
 106 static char *
 107 battery_perc(const char *bat)
 108 {
 109         int perc;
 110         FILE *fp;
 111
 112         ccat(3, "/sys/class/power_supply/", bat, "/capacity");
 113         fp = fopen(concat, "r");
 114         if (fp == NULL) {
 115                 warn("Failed to open file %s", concat);
 116                 return smprintf("%s", UNKNOWN_STR);
 117         }
 118         fscanf(fp, "%i", &perc);
 119         fclose(fp);
 120
 121         return smprintf("%d%%", perc);
 122 }
 123
 124 static char *
 125 battery_state(const char *bat)
 126 {
 127         char state[12];
 128         FILE *fp;
 129
 130         ccat(3, "/sys/class/power_supply/", bat, "/status");
 131         fp = fopen(concat, "r");
 132         if (fp == NULL) {
 133                 warn("Failed to open file %s", concat);
 134                 return smprintf("%s", UNKNOWN_STR);
 135         }
 136         fscanf(fp, "%12s", state);
 137         fclose(fp);
 138
 139         if (strcmp(state, "Charging") == 0) {
 140                 return smprintf("+");
 141         } else if (strcmp(state, "Discharging") == 0) {
 142                 return smprintf("-");
 143         } else if (strcmp(state, "Full") == 0) {
 144                 return smprintf("=");
 145         } else {
 146                 return smprintf("?");
 147         }
 148 }
 149
 150 static char *
 151 cpu_perc(void)
 152 {
 153         int perc;
 154         long double a[4], b[4];
 155         FILE *fp;
 156
 157         fp = fopen("/proc/stat", "r");
 158         if (fp == NULL) {
 159                 warn("Failed to open file /proc/stat");
 160                 return smprintf("%s", UNKNOWN_STR);
 161         }
 162         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 163         fclose(fp);
 164
 165         delay++;
 166         sleep(delay);
 167
 168         fp = fopen("/proc/stat", "r");
 169         if (fp == NULL) {
 170                 warn("Failed to open file /proc/stat");
 171                 return smprintf("%s", UNKNOWN_STR);
 172         }
 173         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 174         fclose(fp);
 175
 176         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]));
 177         return smprintf("%d%%", perc);
 178 }
 179
 180 static char *
 181 datetime(const char *fmt)
 182 {
 183         time_t t;
 184         char str[80];
 185
 186         t = time(NULL);
 187         if (strftime(str, sizeof(str), fmt, localtime(&t)) == 0) {
 188                 return smprintf("%s", UNKNOWN_STR);
 189         }
 190
 191         return smprintf("%s", str);
 192 }
 193
 194 static char *
 195 disk_free(const char *mnt)
 196 {
 197         struct statvfs fs;
 198
 199         if (statvfs(mnt, &fs) < 0) {
 200                 warn("Failed to get filesystem info");
 201                 return smprintf("%s", UNKNOWN_STR);
 202         }
 203
 204         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 205 }
 206
 207 static char *
 208 disk_perc(const char *mnt)
 209 {
 210         int perc;
 211         struct statvfs fs;
 212
 213         if (statvfs(mnt, &fs) < 0) {
 214                 warn("Failed to get filesystem info");
 215                 return smprintf("%s", UNKNOWN_STR);
 216         }
 217
 218         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 219
 220         return smprintf("%d%%", perc);
 221 }
 222
 223 static char *
 224 disk_total(const char *mnt)
 225 {
 226         struct statvfs fs;
 227
 228         if (statvfs(mnt, &fs) < 0) {
 229                 warn("Failed to get filesystem info");
 230                 return smprintf("%s", UNKNOWN_STR);
 231         }
 232
 233         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 234 }
 235
 236 static char *
 237 disk_used(const char *mnt)
 238 {
 239         struct statvfs fs;
 240
 241         if (statvfs(mnt, &fs) < 0) {
 242                 warn("Failed to get filesystem info");
 243                 return smprintf("%s", UNKNOWN_STR);
 244         }
 245
 246         return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 247 }
 248
 249 static char *
 250 entropy(void)
 251 {
 252         int num;
 253         FILE *fp;
 254
 255         fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
 256         if (fp == NULL) {
 257                 warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
 258                 return smprintf("%s", UNKNOWN_STR);
 259         }
 260         fscanf(fp, "%d", &num);
 261         fclose(fp);
 262
 263         return smprintf("%d", num);
 264 }
 265
 266 static char *
 267 gid(void)
 268 {
 269         return smprintf("%d", getgid());
 270 }
 271
 272 static char *
 273 hostname(void)
 274 {
 275         char buf[HOST_NAME_MAX];
 276
 277         if (gethostname(buf, sizeof(buf)) == -1) {
 278                 warn("hostname");
 279                 return smprintf("%s", UNKNOWN_STR);
 280         }
 281
 282         return smprintf("%s", buf);
 283 }
 284
 285 static char *
 286 ip(const char *iface)
 287 {
 288         struct ifaddrs *ifaddr, *ifa;
 289         int s;
 290         char host[NI_MAXHOST];
 291
 292         if (getifaddrs(&ifaddr) == -1) {
 293                 warn("Failed to get IP address for interface %s", iface);
 294                 return smprintf("%s", UNKNOWN_STR);
 295         }
 296
 297         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 298                 if (ifa->ifa_addr == NULL) {
 299                         continue;
 300                 }
 301                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 302                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 303                         if (s != 0) {
 304                                 warnx("Failed to get IP address for interface %s", iface);
 305                                 return smprintf("%s", UNKNOWN_STR);
 306                         }
 307                         return smprintf("%s", host);
 308                 }
 309         }
 310
 311         freeifaddrs(ifaddr);
 312
 313         return smprintf("%s", UNKNOWN_STR);
 314 }
 315
 316 static char *
 317 kernel_release(void)
 318 {
 319         struct utsname udata;
 320
 321         if (uname(&udata) < 0) {
 322                 return smprintf(UNKNOWN_STR);
 323         }
 324
 325         return smprintf("%s", udata.release);
 326 }
 327
 328 static char *
 329 load_avg(void)
 330 {
 331         double avgs[3];
 332
 333         if (getloadavg(avgs, 3) < 0) {
 334                 warnx("Failed to get the load avg");
 335                 return smprintf("%s", UNKNOWN_STR);
 336         }
 337
 338         return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 339 }
 340
 341 static char *
 342 ram_free(void)
 343 {
 344         long free;
 345         FILE *fp;
 346
 347         fp = fopen("/proc/meminfo", "r");
 348         if (fp == NULL) {
 349                 warn("Failed to open file /proc/meminfo");
 350                 return smprintf("%s", UNKNOWN_STR);
 351         }
 352         fscanf(fp, "MemFree: %ld kB\n", &free);
 353         fclose(fp);
 354
 355         return smprintf("%f", (float)free / 1024 / 1024);
 356 }
 357
 358 static char *
 359 ram_perc(void)
 360 {
 361         long total, free, buffers, cached;
 362         FILE *fp;
 363
 364         fp = fopen("/proc/meminfo", "r");
 365         if (fp == NULL) {
 366                 warn("Failed to open file /proc/meminfo");
 367                 return smprintf("%s", UNKNOWN_STR);
 368         }
 369         fscanf(fp, "MemTotal: %ld kB\n", &total);
 370         fscanf(fp, "MemFree: %ld kB\n", &free);
 371         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 372         fscanf(fp, "Cached: %ld kB\n", &cached);
 373         fclose(fp);
 374
 375         return smprintf("%d%%", 100 * ((total - free) - (buffers + cached)) / total);
 376 }
 377
 378 static char *
 379 ram_total(void)
 380 {
 381         long total;
 382         FILE *fp;
 383
 384         fp = fopen("/proc/meminfo", "r");
 385         if (fp == NULL) {
 386                 warn("Failed to open file /proc/meminfo");
 387                 return smprintf("%s", UNKNOWN_STR);
 388         }
 389         fscanf(fp, "MemTotal: %ld kB\n", &total);
 390         fclose(fp);
 391
 392         return smprintf("%f", (float)total / 1024 / 1024);
 393 }
 394
 395 static char *
 396 ram_used(void)
 397 {
 398         long free, total, buffers, cached;
 399         FILE *fp;
 400
 401         fp = fopen("/proc/meminfo", "r");
 402         if (fp == NULL) {
 403                 warn("Failed to open file /proc/meminfo");
 404                 return smprintf("%s", UNKNOWN_STR);
 405         }
 406         fscanf(fp, "MemTotal: %ld kB\n", &total);
 407         fscanf(fp, "MemFree: %ld kB\n", &free);
 408         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 409         fscanf(fp, "Cached: %ld kB\n", &cached);
 410         fclose(fp);
 411
 412         return smprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 413 }
 414
 415 static char *
 416 run_command(const char *cmd)
 417 {
 418         char *nlptr;
 419         FILE *fp;
 420         char buf[1024] = UNKNOWN_STR;
 421
 422         fp = popen(cmd, "r");
 423         if (fp == NULL) {
 424                 warn("Failed to get command output for %s", cmd);
 425                 return smprintf("%s", UNKNOWN_STR);
 426         }
 427         fgets(buf, sizeof(buf), fp);
 428         pclose(fp);
 429         buf[strlen(buf)] = '\0';
 430
 431         if ((nlptr = strstr(buf, "\n")) != NULL) {
 432                 nlptr[0] = '\0';
 433         }
 434
 435         return smprintf("%s", buf);
 436 }
 437
 438 static char *
 439 swap_free(void)
 440 {
 441         long total, free;
 442         FILE *fp;
 443         char buf[2048];
 444         size_t bytes_read;
 445         char *match;
 446
 447         fp = fopen("/proc/meminfo", "r");
 448         if (fp == NULL) {
 449                 warn("Failed to open file /proc/meminfo");
 450                 return smprintf("%s", UNKNOWN_STR);
 451         }
 452
 453         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 454                 warn("swap_free: read error");
 455                 fclose(fp);
 456                 return smprintf("%s", UNKNOWN_STR);
 457         }
 458
 459         buf[bytes_read] = '\0';
 460         fclose(fp);
 461
 462         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 463                 return smprintf("%s", UNKNOWN_STR);
 464         }
 465         sscanf(match, "SwapTotal: %ld kB\n", &total);
 466
 467         if ((match = strstr(buf, "SwapFree")) == NULL) {
 468                 return smprintf("%s", UNKNOWN_STR);
 469         }
 470         sscanf(match, "SwapFree: %ld kB\n", &free);
 471
 472         return smprintf("%f", (float)free / 1024 / 1024);
 473 }
 474
 475 static char *
 476 swap_perc(void)
 477 {
 478         long total, free, cached;
 479         FILE *fp;
 480         char buf[2048];
 481         size_t bytes_read;
 482         char *match;
 483
 484         fp = fopen("/proc/meminfo", "r");
 485         if (fp == NULL) {
 486                 warn("Failed to open file /proc/meminfo");
 487                 return smprintf("%s", UNKNOWN_STR);
 488         }
 489
 490         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 491                 warn("swap_perc: read error");
 492                 fclose(fp);
 493                 return smprintf("%s", UNKNOWN_STR);
 494         }
 495
 496         buf[bytes_read] = '\0';
 497         fclose(fp);
 498
 499         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 500                 return smprintf("%s", UNKNOWN_STR);
 501         }
 502         sscanf(match, "SwapTotal: %ld kB\n", &total);
 503
 504         if ((match = strstr(buf, "SwapCached")) == NULL) {
 505                 return smprintf("%s", UNKNOWN_STR);
 506         }
 507         sscanf(match, "SwapCached: %ld kB\n", &cached);
 508
 509         if ((match = strstr(buf, "SwapFree")) == NULL) {
 510                 return smprintf("%s", UNKNOWN_STR);
 511         }
 512         sscanf(match, "SwapFree: %ld kB\n", &free);
 513
 514         return smprintf("%d%%", 100 * (total - free - cached) / total);
 515 }
 516
 517 static char *
 518 swap_total(void)
 519 {
 520         long total;
 521         FILE *fp;
 522         char buf[2048];
 523         size_t bytes_read;
 524         char *match;
 525
 526         fp = fopen("/proc/meminfo", "r");
 527         if (fp == NULL) {
 528                 warn("Failed to open file /proc/meminfo");
 529                 return smprintf("%s", UNKNOWN_STR);
 530         }
 531         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 532                 warn("swap_total: read error");
 533                 fclose(fp);
 534                 return smprintf("%s", UNKNOWN_STR);
 535         }
 536
 537         buf[bytes_read] = '\0';
 538         fclose(fp);
 539
 540         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 541                 return smprintf("%s", UNKNOWN_STR);
 542         }
 543         sscanf(match, "SwapTotal: %ld kB\n", &total);
 544
 545         return smprintf("%f", (float)total / 1024 / 1024);
 546 }
 547
 548 static char *
 549 swap_used(void)
 550 {
 551         long total, free, cached;
 552         FILE *fp;
 553         char buf[2048];
 554         size_t bytes_read;
 555         char *match;
 556
 557         fp = fopen("/proc/meminfo", "r");
 558         if (fp == NULL) {
 559                 warn("Failed to open file /proc/meminfo");
 560                 return smprintf("%s", UNKNOWN_STR);
 561         }
 562         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 563                 warn("swap_used: read error");
 564                 fclose(fp);
 565                 return smprintf("%s", UNKNOWN_STR);
 566         }
 567
 568         buf[bytes_read] = '\0';
 569         fclose(fp);
 570
 571         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 572                 return smprintf("%s", UNKNOWN_STR);
 573         }
 574         sscanf(match, "SwapTotal: %ld kB\n", &total);
 575
 576         if ((match = strstr(buf, "SwapCached")) == NULL) {
 577                 return smprintf("%s", UNKNOWN_STR);
 578         }
 579         sscanf(match, "SwapCached: %ld kB\n", &cached);
 580
 581         if ((match = strstr(buf, "SwapFree")) == NULL) {
 582                 return smprintf("%s", UNKNOWN_STR);
 583         }
 584         sscanf(match, "SwapFree: %ld kB\n", &free);
 585
 586         return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 587 }
 588
 589 static char *
 590 temp(const char *file)
 591 {
 592         int temp;
 593         FILE *fp;
 594
 595         fp = fopen(file, "r");
 596         if (fp == NULL) {
 597                 warn("Failed to open file %s", file);
 598                 return smprintf("%s", UNKNOWN_STR);
 599         }
 600         fscanf(fp, "%d", &temp);
 601         fclose(fp);
 602
 603         return smprintf("%d°C", temp / 1000);
 604 }
 605
 606 static char *
 607 uptime(void)
 608 {
 609         struct sysinfo info;
 610         int h = 0;
 611         int m = 0;
 612
 613         sysinfo(&info);
 614         h = info.uptime / 3600;
 615         m = (info.uptime - h * 3600 ) / 60;
 616
 617         return smprintf("%dh %dm", h, m);
 618 }
 619
 620 static char *
 621 username(void)
 622 {
 623         uid_t uid = geteuid();
 624         struct passwd *pw = getpwuid(uid);
 625
 626         if (pw == NULL) {
 627                 warn("Failed to get username");
 628                 return smprintf("%s", UNKNOWN_STR);
 629         }
 630
 631         return smprintf("%s", pw->pw_name);
 632 }
 633
 634 static char *
 635 uid(void)
 636 {
 637         return smprintf("%d", geteuid());
 638 }
 639
 640
 641 static char *
 642 vol_perc(const char *card)
 643 {
 644         int mute;
 645         long int vol, max, min;
 646         snd_mixer_t *handle;
 647         snd_mixer_elem_t *elem;
 648         snd_mixer_selem_id_t *s_elem;
 649
 650         snd_mixer_open(&handle, 0);
 651         snd_mixer_attach(handle, card);
 652         snd_mixer_selem_register(handle, NULL, NULL);
 653         snd_mixer_load(handle);
 654         snd_mixer_selem_id_malloc(&s_elem);
 655         snd_mixer_selem_id_set_name(s_elem, "Master");
 656         elem = snd_mixer_find_selem(handle, s_elem);
 657
 658         if (elem == NULL) {
 659                 snd_mixer_selem_id_free(s_elem);
 660                 snd_mixer_close(handle);
 661                 warn("Failed to get volume percentage for %s", card);
 662                 return smprintf("%s", UNKNOWN_STR);
 663         }
 664
 665         snd_mixer_handle_events(handle);
 666         snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
 667         snd_mixer_selem_get_playback_volume(elem, 0, &vol);
 668         snd_mixer_selem_get_playback_switch(elem, 0, &mute);
 669
 670         snd_mixer_selem_id_free(s_elem);
 671         snd_mixer_close(handle);
 672
 673         if (!mute)
 674                 return smprintf("mute");
 675         else if (max == 0)
 676                 return smprintf("0%%");
 677         else
 678                 return smprintf("%lu%%", ((uint_fast16_t)(vol * 100) / max));
 679 }
 680
 681 static char *
 682 wifi_perc(const char *iface)
 683 {
 684         int perc;
 685         char buf[255];
 686         char *datastart;
 687         char status[5];
 688         FILE *fp;
 689
 690         ccat(3, "/sys/class/net/", iface, "/operstate");
 691         fp = fopen(concat, "r");
 692         if (fp == NULL) {
 693                 warn("Failed to open file %s", concat);
 694                 return smprintf("%s", UNKNOWN_STR);
 695         }
 696         fgets(status, 5, fp);
 697         fclose(fp);
 698         if(strcmp(status, "up\n") != 0) {
 699                 return smprintf("%s", UNKNOWN_STR);
 700         }
 701
 702         fp = fopen("/proc/net/wireless", "r");
 703         if (fp == NULL) {
 704                 warn("Failed to open file /proc/net/wireless");
 705                 return smprintf("%s", UNKNOWN_STR);
 706         }
 707         ccat(2, iface, ":");
 708         fgets(buf, sizeof(buf), fp);
 709         fgets(buf, sizeof(buf), fp);
 710         fgets(buf, sizeof(buf), fp);
 711         fclose(fp);
 712
 713         if ((datastart = strstr(buf, concat)) == NULL) {
 714                 return smprintf("%s", UNKNOWN_STR);
 715         }
 716         datastart = (datastart+(strlen(iface)+1));
 717         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 718
 719         return smprintf("%d%%", perc);
 720 }
 721
 722 static char *
 723 wifi_essid(const char *iface)
 724 {
 725         char id[IW_ESSID_MAX_SIZE+1];
 726         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 727         struct iwreq wreq;
 728
 729         memset(&wreq, 0, sizeof(struct iwreq));
 730         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 731         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 732
 733         if (sockfd == -1) {
 734                 warn("Failed to get ESSID for interface %s", iface);
 735                 return smprintf("%s", UNKNOWN_STR);
 736         }
 737         wreq.u.essid.pointer = id;
 738         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 739                 warn("Failed to get ESSID for interface %s", iface);
 740                 return smprintf("%s", UNKNOWN_STR);
 741         }
 742
 743         close(sockfd);
 744
 745         if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
 746                 return smprintf("%s", UNKNOWN_STR);
 747         else
 748                 return smprintf("%s", (char *)wreq.u.essid.pointer);
 749 }
 750
 751 static void
 752 sighandler(const int signo)
 753 {
 754         if (signo == SIGTERM || signo == SIGINT) {
 755                 done = 1;
 756         }
 757 }
 758
 759 static void
 760 usage(int eval)
 761 {
 762         fprintf(stderr, "usage: %s [-d] [-o] [-v] [-h]\n", argv0);
 763         exit(eval);
 764 }
 765
 766 int
 767 main(int argc, char *argv[])
 768 {
 769         unsigned short int i;
 770         char status_string[2048];
 771         char *res, *element;
 772         struct arg argument;
 773         struct sigaction act;
 774
 775         ARGBEGIN {
 776                 case 'd':
 777                         dflag = 1;
 778                         break;
 779                 case 'o':
 780                         oflag = 1;
 781                         break;
 782                 case 'v':
 783                         printf("slstatus %s (C) 2016 slstatus engineers\n", VERSION);
 784                         return 0;
 785                 case 'h':
 786                         usage(0);
 787                 default:
 788                         usage(1);
 789         } ARGEND
 790
 791         if (dflag && oflag) {
 792                 usage(1);
 793         }
 794         if (dflag && daemon(1, 1) < 0) {
 795                 err(1, "daemon");
 796         }
 797
 798         memset(&act, 0, sizeof(act));
 799         act.sa_handler = sighandler;
 800         sigaction(SIGINT,  &act, 0);
 801         sigaction(SIGTERM, &act, 0);
 802
 803         if (!oflag) {
 804                 dpy = XOpenDisplay(NULL);
 805         }
 806
 807         setlocale(LC_ALL, "");
 808
 809         while (!done) {
 810                 status_string[0] = '\0';
 811
 812                 for (i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 813                         argument = args[i];
 814                         if (argument.args == NULL) {
 815                                 res = argument.func();
 816                         } else {
 817                                 res = argument.func(argument.args);
 818                         }
 819                         element = smprintf(argument.fmt, res);
 820                         if (element == NULL) {
 821                                 element = smprintf("%s", UNKNOWN_STR);
 822                                 warnx("Failed to format output");
 823                         }
 824                         if (strlcat(status_string, element, sizeof(status_string)) >= sizeof(status_string)) {
 825                                 warnx("Output too long");
 826                         }
 827                         free(res);
 828                         free(element);
 829                 }
 830
 831                 if (!oflag) {
 832                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 833                         XSync(dpy, False);
 834                 } else {
 835                         printf("%s\n", status_string);
 836                 }
 837
 838                 if ((UPDATE_INTERVAL - delay) <= 0) {
 839                         delay = 0;
 840                         continue;
 841                 } else {
 842                         sleep(UPDATE_INTERVAL - delay);
 843                         delay = 0;
 844                 }
 845         }
 846
 847         if (!oflag) {
 848                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 849                 XCloseDisplay(dpy);
 850         }
 851
 852         return 0;
 853 }