slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 #include <dirent.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/soundcard.h>
  22 #include <sys/sysinfo.h>
  23 #include <sys/types.h>
  24 #include <sys/utsname.h>
  25 #include <time.h>
  26 #include <unistd.h>
  27 #include <X11/Xlib.h>
  28
  29 #include "arg.h"
  30
  31 struct arg {
  32         const char *(*func)();
  33         const char *fmt;
  34         const char *args;
  35 };
  36
  37 static const char *bprintf(const char *fmt, ...);
  38 static const char *battery_perc(const char *bat);
  39 static const char *battery_power(const char *bat);
  40 static const char *battery_state(const char *bat);
  41 static const char *cpu_freq(void);
  42 static const char *cpu_perc(void);
  43 static const char *datetime(const char *fmt);
  44 static const char *disk_free(const char *mnt);
  45 static const char *disk_perc(const char *mnt);
  46 static const char *disk_total(const char *mnt);
  47 static const char *disk_used(const char *mnt);
  48 static const char *entropy(void);
  49 static const char *gid(void);
  50 static const char *hostname(void);
  51 static const char *ip(const char *iface);
  52 static const char *kernel_release(void);
  53 static const char *keyboard_indicators(void);
  54 static const char *load_avg(void);
  55 static const char *num_files(const char *dir);
  56 static const char *ram_free(void);
  57 static const char *ram_perc(void);
  58 static const char *ram_used(void);
  59 static const char *ram_total(void);
  60 static const char *run_command(const char *cmd);
  61 static const char *swap_free(void);
  62 static const char *swap_perc(void);
  63 static const char *swap_used(void);
  64 static const char *swap_total(void);
  65 static const char *temp(const char *file);
  66 static const char *uid(void);
  67 static const char *uptime(void);
  68 static const char *username(void);
  69 static const char *vol_perc(const char *card);
  70 static const char *wifi_perc(const char *iface);
  71 static const char *wifi_essid(const char *iface);
  72 static void sighandler(const int signo);
  73 static void usage(void);
  74
  75 char *argv0;
  76 static unsigned short int delay = 0;
  77 static unsigned short int done;
  78 static Display *dpy;
  79
  80 #include "config.h"
  81
  82 static char buf[MAXLEN];
  83
  84 static const char *
  85 bprintf(const char *fmt, ...)
  86 {
  87         va_list ap;
  88         size_t len;
  89
  90         va_start(ap, fmt);
  91         len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
  92         va_end(ap);
  93
  94         if (len >= sizeof(buf))
  95                 buf[sizeof(buf)-1] = '\0';
  96
  97         return buf;
  98 }
  99
 100 static const char *
 101 battery_perc(const char *bat)
 102 {
 103         int n, perc;
 104         char path[PATH_MAX];
 105         FILE *fp;
 106
 107         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
 108         fp = fopen(path, "r");
 109         if (fp == NULL) {
 110                 warn("Failed to open file %s", path);
 111                 return UNKNOWN_STR;
 112         }
 113         n = fscanf(fp, "%i", &perc);
 114         fclose(fp);
 115         if (n != 1)
 116                 return UNKNOWN_STR;
 117
 118         return bprintf("%d", perc);
 119 }
 120
 121 static const char *
 122 battery_power(const char *bat)
 123 {
 124         char path[PATH_MAX];
 125         FILE *fp;
 126         int n, watts;
 127
 128         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
 129         fp = fopen(path, "r");
 130         if (fp == NULL) {
 131                 warn("Failed to open file %s", path);
 132                 return UNKNOWN_STR;
 133         }
 134         n = fscanf(fp, "%i", &watts);
 135         fclose(fp);
 136         if (n != 1)
 137                 return UNKNOWN_STR;
 138
 139         return bprintf("%d", (watts + 500000) / 1000000);
 140 }
 141
 142 static const char *
 143 battery_state(const char *bat)
 144 {
 145         char path[PATH_MAX];
 146         char state[12];
 147         FILE *fp;
 148         int n;
 149
 150         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
 151         fp = fopen(path, "r");
 152         if (fp == NULL) {
 153                 warn("Failed to open file %s", path);
 154                 return UNKNOWN_STR;
 155         }
 156         n = fscanf(fp, "%12s", state);
 157         fclose(fp);
 158         if (n != 1)
 159                 return UNKNOWN_STR;
 160
 161         if (strcmp(state, "Charging") == 0) {
 162                 return "+";
 163         } else if (strcmp(state, "Discharging") == 0) {
 164                 return "-";
 165         } else if (strcmp(state, "Full") == 0) {
 166                 return "=";
 167         } else if (strcmp(state, "Unknown") == 0) {
 168                 return "/";
 169         } else {
 170                 return "?";
 171         }
 172 }
 173
 174 static const char *
 175 cpu_freq(void)
 176 {
 177         int n, freq;
 178         FILE *fp;
 179
 180         fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
 181         if (fp == NULL) {
 182                 warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
 183                 return UNKNOWN_STR;
 184         }
 185         n = fscanf(fp, "%i", &freq);
 186         fclose(fp);
 187         if (n != 1)
 188                 return UNKNOWN_STR;
 189
 190         return bprintf("%d", (freq + 500) / 1000);
 191 }
 192
 193 static const char *
 194 cpu_perc(void)
 195 {
 196         int n, perc;
 197         long double a[4], b[4];
 198         FILE *fp;
 199
 200         fp = fopen("/proc/stat", "r");
 201         if (fp == NULL) {
 202                 warn("Failed to open file /proc/stat");
 203                 return UNKNOWN_STR;
 204         }
 205         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 206         fclose(fp);
 207         if (n != 4)
 208                 return UNKNOWN_STR;
 209
 210         delay++;
 211         sleep(delay);
 212
 213         fp = fopen("/proc/stat", "r");
 214         if (fp == NULL) {
 215                 warn("Failed to open file /proc/stat");
 216                 return UNKNOWN_STR;
 217         }
 218         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 219         fclose(fp);
 220         if (n != 4)
 221                 return UNKNOWN_STR;
 222
 223         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]));
 224         return bprintf("%d", perc);
 225 }
 226
 227 static const char *
 228 datetime(const char *fmt)
 229 {
 230         time_t t;
 231
 232         t = time(NULL);
 233         if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
 234                 return UNKNOWN_STR;
 235
 236         return buf;
 237 }
 238
 239 static const char *
 240 disk_free(const char *mnt)
 241 {
 242         struct statvfs fs;
 243
 244         if (statvfs(mnt, &fs) < 0) {
 245                 warn("Failed to get filesystem info");
 246                 return UNKNOWN_STR;
 247         }
 248
 249         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 250 }
 251
 252 static const char *
 253 disk_perc(const char *mnt)
 254 {
 255         int perc;
 256         struct statvfs fs;
 257
 258         if (statvfs(mnt, &fs) < 0) {
 259                 warn("Failed to get filesystem info");
 260                 return UNKNOWN_STR;
 261         }
 262
 263         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 264
 265         return bprintf("%d", perc);
 266 }
 267
 268 static const char *
 269 disk_total(const char *mnt)
 270 {
 271         struct statvfs fs;
 272
 273         if (statvfs(mnt, &fs) < 0) {
 274                 warn("Failed to get filesystem info");
 275                 return UNKNOWN_STR;
 276         }
 277
 278         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 279 }
 280
 281 static const char *
 282 disk_used(const char *mnt)
 283 {
 284         struct statvfs fs;
 285
 286         if (statvfs(mnt, &fs) < 0) {
 287                 warn("Failed to get filesystem info");
 288                 return UNKNOWN_STR;
 289         }
 290
 291         return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 292 }
 293
 294 static const char *
 295 entropy(void)
 296 {
 297         int n, num;
 298         FILE *fp;
 299
 300         fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
 301         if (fp == NULL) {
 302                 warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
 303                 return UNKNOWN_STR;
 304         }
 305         n = fscanf(fp, "%d", &num);
 306         fclose(fp);
 307         if (n != 1)
 308                 return UNKNOWN_STR;
 309
 310         return bprintf("%d", num);
 311 }
 312
 313 static const char *
 314 gid(void)
 315 {
 316         return bprintf("%d", getgid());
 317 }
 318
 319 static const char *
 320 hostname(void)
 321 {
 322         if (gethostname(buf, sizeof(buf)) == -1) {
 323                 warn("hostname");
 324                 return UNKNOWN_STR;
 325         }
 326
 327         return buf;
 328 }
 329
 330 static const char *
 331 ip(const char *iface)
 332 {
 333         struct ifaddrs *ifaddr, *ifa;
 334         int s;
 335         char host[NI_MAXHOST];
 336
 337         if (getifaddrs(&ifaddr) == -1) {
 338                 warn("Failed to get IP address for interface %s", iface);
 339                 return UNKNOWN_STR;
 340         }
 341
 342         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 343                 if (ifa->ifa_addr == NULL) {
 344                         continue;
 345                 }
 346                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 347                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 348                         if (s != 0) {
 349                                 warnx("Failed to get IP address for interface %s", iface);
 350                                 return UNKNOWN_STR;
 351                         }
 352                         return bprintf("%s", host);
 353                 }
 354         }
 355
 356         freeifaddrs(ifaddr);
 357
 358         return UNKNOWN_STR;
 359 }
 360
 361 static const char *
 362 kernel_release(void)
 363 {
 364         struct utsname udata;
 365
 366         if (uname(&udata) < 0) {
 367                 return UNKNOWN_STR;
 368         }
 369
 370         return bprintf("%s", udata.release);
 371 }
 372
 373 static const char *
 374 keyboard_indicators(void)
 375 {
 376         Display *dpy = XOpenDisplay(NULL);
 377         XKeyboardState state;
 378         XGetKeyboardControl(dpy, &state);
 379         XCloseDisplay(dpy);
 380
 381         switch (state.led_mask) {
 382                 case 1:
 383                         return "c";
 384                 case 2:
 385                         return "n";
 386                 case 3:
 387                         return "cn";
 388                 default:
 389                         return "";
 390         }
 391 }
 392
 393 static const char *
 394 load_avg(void)
 395 {
 396         double avgs[3];
 397
 398         if (getloadavg(avgs, 3) < 0) {
 399                 warnx("Failed to get the load avg");
 400                 return UNKNOWN_STR;
 401         }
 402
 403         return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 404 }
 405
 406 static const char *
 407 num_files(const char *dir)
 408 {
 409         struct dirent *dp;
 410         DIR *fd;
 411         int num = 0;
 412
 413         if ((fd = opendir(dir)) == NULL) {
 414                 warn("Failed to get number of files in directory %s", dir);
 415                 return UNKNOWN_STR;
 416         }
 417
 418         while ((dp = readdir(fd)) != NULL) {
 419                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 420                         continue; /* skip self and parent */
 421                 num++;
 422         }
 423
 424         closedir(fd);
 425
 426         return bprintf("%d", num);
 427 }
 428
 429 static const char *
 430 ram_free(void)
 431 {
 432         long free;
 433         FILE *fp;
 434         int n;
 435
 436         fp = fopen("/proc/meminfo", "r");
 437         if (fp == NULL) {
 438                 warn("Failed to open file /proc/meminfo");
 439                 return UNKNOWN_STR;
 440         }
 441         n = fscanf(fp, "MemFree: %ld kB\n", &free);
 442         fclose(fp);
 443         if (n != 1)
 444                 return UNKNOWN_STR;
 445
 446         return bprintf("%f", (float)free / 1024 / 1024);
 447 }
 448
 449 static const char *
 450 ram_perc(void)
 451 {
 452         long total, free, buffers, cached;
 453         FILE *fp;
 454
 455         fp = fopen("/proc/meminfo", "r");
 456         if (fp == NULL) {
 457                 warn("Failed to open file /proc/meminfo");
 458                 return UNKNOWN_STR;
 459         }
 460         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 461             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 462             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 463                    &buffers, &buffers) != 2 ||
 464             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 465                 goto scanerr;
 466         fclose(fp);
 467
 468         return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
 469
 470 scanerr:
 471         fclose(fp);
 472         return UNKNOWN_STR;
 473 }
 474
 475 static const char *
 476 ram_total(void)
 477 {
 478         long total;
 479         FILE *fp;
 480         int n;
 481
 482         fp = fopen("/proc/meminfo", "r");
 483         if (fp == NULL) {
 484                 warn("Failed to open file /proc/meminfo");
 485                 return UNKNOWN_STR;
 486         }
 487         n = fscanf(fp, "MemTotal: %ld kB\n", &total);
 488         fclose(fp);
 489         if (n != 1)
 490                 return UNKNOWN_STR;
 491
 492         return bprintf("%f", (float)total / 1024 / 1024);
 493 }
 494
 495 static const char *
 496 ram_used(void)
 497 {
 498         long free, total, buffers, cached;
 499         FILE *fp;
 500
 501         fp = fopen("/proc/meminfo", "r");
 502         if (fp == NULL) {
 503                 warn("Failed to open file /proc/meminfo");
 504                 return UNKNOWN_STR;
 505         }
 506         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 507             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 508             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 509                    &buffers, &buffers) != 2 ||
 510             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 511                 goto scanerr;
 512         fclose(fp);
 513
 514         return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 515
 516 scanerr:
 517         fclose(fp);
 518         return UNKNOWN_STR;
 519 }
 520
 521 static const char *
 522 run_command(const char *cmd)
 523 {
 524         char *p;
 525         FILE *fp;
 526
 527         fp = popen(cmd, "r");
 528         if (fp == NULL) {
 529                 warn("Failed to get command output for %s", cmd);
 530                 return UNKNOWN_STR;
 531         }
 532         p = fgets(buf, sizeof(buf) - 1, fp);
 533         pclose(fp);
 534         if (!p)
 535                 return UNKNOWN_STR;
 536         if ((p = strrchr(buf, '\n')) != NULL)
 537                 p[0] = '\0';
 538
 539         return buf[0] ? buf : UNKNOWN_STR;
 540 }
 541
 542 static const char *
 543 swap_free(void)
 544 {
 545         long total, free;
 546         FILE *fp;
 547         size_t bytes_read;
 548         char *match;
 549
 550         fp = fopen("/proc/meminfo", "r");
 551         if (fp == NULL) {
 552                 warn("Failed to open file /proc/meminfo");
 553                 return UNKNOWN_STR;
 554         }
 555
 556         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 557                 warn("swap_free: read error");
 558                 fclose(fp);
 559                 return UNKNOWN_STR;
 560         }
 561         fclose(fp);
 562
 563         if ((match = strstr(buf, "SwapTotal")) == NULL)
 564                 return UNKNOWN_STR;
 565         sscanf(match, "SwapTotal: %ld kB\n", &total);
 566
 567         if ((match = strstr(buf, "SwapFree")) == NULL)
 568                 return UNKNOWN_STR;
 569         sscanf(match, "SwapFree: %ld kB\n", &free);
 570
 571         return bprintf("%f", (float)free / 1024 / 1024);
 572 }
 573
 574 static const char *
 575 swap_perc(void)
 576 {
 577         long total, free, cached;
 578         FILE *fp;
 579         size_t bytes_read;
 580         char *match;
 581
 582         fp = fopen("/proc/meminfo", "r");
 583         if (fp == NULL) {
 584                 warn("Failed to open file /proc/meminfo");
 585                 return UNKNOWN_STR;
 586         }
 587
 588         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 589                 warn("swap_perc: read error");
 590                 fclose(fp);
 591                 return UNKNOWN_STR;
 592         }
 593         fclose(fp);
 594
 595         if ((match = strstr(buf, "SwapTotal")) == NULL)
 596                 return UNKNOWN_STR;
 597         sscanf(match, "SwapTotal: %ld kB\n", &total);
 598
 599         if ((match = strstr(buf, "SwapCached")) == NULL)
 600                 return UNKNOWN_STR;
 601         sscanf(match, "SwapCached: %ld kB\n", &cached);
 602
 603         if ((match = strstr(buf, "SwapFree")) == NULL)
 604                 return UNKNOWN_STR;
 605         sscanf(match, "SwapFree: %ld kB\n", &free);
 606
 607         return bprintf("%d", 100 * (total - free - cached) / total);
 608 }
 609
 610 static const char *
 611 swap_total(void)
 612 {
 613         long total;
 614         FILE *fp;
 615         size_t bytes_read;
 616         char *match;
 617
 618         fp = fopen("/proc/meminfo", "r");
 619         if (fp == NULL) {
 620                 warn("Failed to open file /proc/meminfo");
 621                 return UNKNOWN_STR;
 622         }
 623         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 624                 warn("swap_total: read error");
 625                 fclose(fp);
 626                 return UNKNOWN_STR;
 627         }
 628         fclose(fp);
 629
 630         if ((match = strstr(buf, "SwapTotal")) == NULL)
 631                 return UNKNOWN_STR;
 632         sscanf(match, "SwapTotal: %ld kB\n", &total);
 633
 634         return bprintf("%f", (float)total / 1024 / 1024);
 635 }
 636
 637 static const char *
 638 swap_used(void)
 639 {
 640         long total, free, cached;
 641         FILE *fp;
 642         size_t bytes_read;
 643         char *match;
 644
 645         fp = fopen("/proc/meminfo", "r");
 646         if (fp == NULL) {
 647                 warn("Failed to open file /proc/meminfo");
 648                 return UNKNOWN_STR;
 649         }
 650         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 651                 warn("swap_used: read error");
 652                 fclose(fp);
 653                 return UNKNOWN_STR;
 654         }
 655         fclose(fp);
 656
 657         if ((match = strstr(buf, "SwapTotal")) == NULL)
 658                 return UNKNOWN_STR;
 659         sscanf(match, "SwapTotal: %ld kB\n", &total);
 660
 661         if ((match = strstr(buf, "SwapCached")) == NULL)
 662                 return UNKNOWN_STR;
 663         sscanf(match, "SwapCached: %ld kB\n", &cached);
 664
 665         if ((match = strstr(buf, "SwapFree")) == NULL)
 666                 return UNKNOWN_STR;
 667         sscanf(match, "SwapFree: %ld kB\n", &free);
 668
 669         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 670 }
 671
 672 static const char *
 673 temp(const char *file)
 674 {
 675         int n, temp;
 676         FILE *fp;
 677
 678         fp = fopen(file, "r");
 679         if (fp == NULL) {
 680                 warn("Failed to open file %s", file);
 681                 return UNKNOWN_STR;
 682         }
 683         n = fscanf(fp, "%d", &temp);
 684         fclose(fp);
 685         if (n != 1)
 686                 return UNKNOWN_STR;
 687
 688         return bprintf("%d", temp / 1000);
 689 }
 690
 691 static const char *
 692 uptime(void)
 693 {
 694         struct sysinfo info;
 695         int h = 0;
 696         int m = 0;
 697
 698         sysinfo(&info);
 699         h = info.uptime / 3600;
 700         m = (info.uptime - h * 3600 ) / 60;
 701
 702         return bprintf("%dh %dm", h, m);
 703 }
 704
 705 static const char *
 706 username(void)
 707 {
 708         struct passwd *pw = getpwuid(geteuid());
 709
 710         if (pw == NULL) {
 711                 warn("Failed to get username");
 712                 return UNKNOWN_STR;
 713         }
 714
 715         return bprintf("%s", pw->pw_name);
 716 }
 717
 718 static const char *
 719 uid(void)
 720 {
 721         return bprintf("%d", geteuid());
 722 }
 723
 724
 725 static const char *
 726 vol_perc(const char *card)
 727 {
 728         unsigned int i;
 729         int v, afd, devmask;
 730         char *vnames[] = SOUND_DEVICE_NAMES;
 731
 732         afd = open(card, O_RDONLY | O_NONBLOCK);
 733         if (afd == -1) {
 734                 warn("Cannot open %s", card);
 735                 return UNKNOWN_STR;
 736         }
 737
 738         if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
 739                 warn("Cannot get volume for %s", card);
 740                 close(afd);
 741                 return UNKNOWN_STR;
 742         }
 743         for (i = 0; i < (sizeof(vnames) / sizeof((vnames[0]))); i++) {
 744                 if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
 745                         if (ioctl(afd, MIXER_READ(i), &v) == -1) {
 746                                 warn("vol_perc: ioctl");
 747                                 close(afd);
 748                                 return UNKNOWN_STR;
 749                         }
 750                 }
 751         }
 752
 753         close(afd);
 754
 755         return bprintf("%d", v & 0xff);
 756 }
 757
 758 static const char *
 759 wifi_perc(const char *iface)
 760 {
 761         int i, perc;
 762         char *p, *datastart;
 763         char path[PATH_MAX];
 764         char status[5];
 765         FILE *fp;
 766
 767         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
 768         fp = fopen(path, "r");
 769         if (fp == NULL) {
 770                 warn("Failed to open file %s", path);
 771                 return UNKNOWN_STR;
 772         }
 773         p = fgets(status, 5, fp);
 774         fclose(fp);
 775         if(!p || strcmp(status, "up\n") != 0) {
 776                 return UNKNOWN_STR;
 777         }
 778
 779         fp = fopen("/proc/net/wireless", "r");
 780         if (fp == NULL) {
 781                 warn("Failed to open file /proc/net/wireless");
 782                 return UNKNOWN_STR;
 783         }
 784
 785         for (i = 0; i < 3; i++) {
 786                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 787                         break;
 788         }
 789         fclose(fp);
 790         if (i < 2 || !p)
 791                 return UNKNOWN_STR;
 792
 793         if ((datastart = strstr(buf, iface)) == NULL)
 794                 return UNKNOWN_STR;
 795
 796         datastart = (datastart+(strlen(iface)+1));
 797         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 798
 799         return bprintf("%d", perc);
 800 }
 801
 802 static const char *
 803 wifi_essid(const char *iface)
 804 {
 805         static char id[IW_ESSID_MAX_SIZE+1];
 806         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 807         struct iwreq wreq;
 808
 809         memset(&wreq, 0, sizeof(struct iwreq));
 810         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 811         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 812
 813         if (sockfd == -1) {
 814                 warn("Failed to get ESSID for interface %s", iface);
 815                 return UNKNOWN_STR;
 816         }
 817         wreq.u.essid.pointer = id;
 818         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 819                 warn("Failed to get ESSID for interface %s", iface);
 820                 return UNKNOWN_STR;
 821         }
 822
 823         close(sockfd);
 824
 825         if (strcmp(id, "") == 0)
 826                 return UNKNOWN_STR;
 827         else
 828                 return id;
 829 }
 830
 831 static void
 832 sighandler(const int signo)
 833 {
 834         if (signo == SIGTERM || signo == SIGINT) {
 835                 done = 1;
 836         }
 837 }
 838
 839 static void
 840 usage(void)
 841 {
 842         fprintf(stderr, "usage: %s [-s]\n", argv0);
 843         exit(1);
 844 }
 845
 846 int
 847 main(int argc, char *argv[])
 848 {
 849         struct arg argument;
 850         struct sigaction act;
 851         size_t i, len;
 852         int sflag = 0;
 853         char status_string[MAXLEN];
 854         char *element;
 855
 856         ARGBEGIN {
 857                 case 's':
 858                         sflag = 1;
 859                         break;
 860                 default:
 861                         usage();
 862         } ARGEND
 863
 864         memset(&act, 0, sizeof(act));
 865         act.sa_handler = sighandler;
 866         sigaction(SIGINT,  &act, 0);
 867         sigaction(SIGTERM, &act, 0);
 868
 869         if (!sflag) {
 870                 dpy = XOpenDisplay(NULL);
 871         }
 872
 873         setlocale(LC_ALL, "");
 874
 875         while (!done) {
 876                 status_string[0] = '\0';
 877
 878                 for (element = status_string, i = len = 0;
 879                      i < sizeof(args) / sizeof(args[0]);
 880                      ++i, element += len) {
 881                         argument = args[i];
 882                         len = snprintf(element, sizeof(status_string)-1 - len,
 883                                        argument.fmt,
 884                                        argument.func(argument.args));
 885                         if (len >= sizeof(status_string)) {
 886                                 status_string[sizeof(status_string)-1] = '\0';
 887                                 break;
 888                         }
 889                 }
 890
 891                 if (sflag) {
 892                         printf("%s\n", status_string);
 893                 } else {
 894                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 895                         XSync(dpy, False);
 896                 }
 897
 898                 if ((UPDATE_INTERVAL - delay) <= 0) {
 899                         delay = 0;
 900                         continue;
 901                 } else {
 902                         sleep(UPDATE_INTERVAL - delay);
 903                         delay = 0;
 904                 }
 905         }
 906
 907         if (!sflag) {
 908                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 909                 XCloseDisplay(dpy);
 910         }
 911
 912         return 0;
 913 }