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 unsigned short int dflag, oflag, nflag;
  79 static Display *dpy;
  80
  81 #include "config.h"
  82
  83 static char buf[MAXLEN];
  84
  85 static const char *
  86 bprintf(const char *fmt, ...)
  87 {
  88         va_list ap;
  89         size_t len;
  90
  91         va_start(ap, fmt);
  92         len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
  93         va_end(ap);
  94
  95         if (len >= sizeof(buf))
  96                 buf[sizeof(buf)-1] = '\0';
  97
  98         return buf;
  99 }
 100
 101 static const char *
 102 battery_perc(const char *bat)
 103 {
 104         int n, perc;
 105         char path[PATH_MAX];
 106         FILE *fp;
 107
 108         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
 109         fp = fopen(path, "r");
 110         if (fp == NULL) {
 111                 warn("Failed to open file %s", path);
 112                 return UNKNOWN_STR;
 113         }
 114         n = fscanf(fp, "%i", &perc);
 115         fclose(fp);
 116         if (n != 1)
 117                 return UNKNOWN_STR;
 118
 119         return bprintf("%d", perc);
 120 }
 121
 122 static const char *
 123 battery_power(const char *bat)
 124 {
 125         char path[PATH_MAX];
 126         FILE *fp;
 127         int n, watts;
 128
 129         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
 130         fp = fopen(path, "r");
 131         if (fp == NULL) {
 132                 warn("Failed to open file %s", path);
 133                 return UNKNOWN_STR;
 134         }
 135         n = fscanf(fp, "%i", &watts);
 136         fclose(fp);
 137         if (n != 1)
 138                 return UNKNOWN_STR;
 139
 140         return bprintf("%d", (watts + 500000) / 1000000);
 141 }
 142
 143 static const char *
 144 battery_state(const char *bat)
 145 {
 146         char path[PATH_MAX];
 147         char state[12];
 148         FILE *fp;
 149         int n;
 150
 151         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
 152         fp = fopen(path, "r");
 153         if (fp == NULL) {
 154                 warn("Failed to open file %s", path);
 155                 return UNKNOWN_STR;
 156         }
 157         n = fscanf(fp, "%12s", state);
 158         fclose(fp);
 159         if (n != 1)
 160                 return UNKNOWN_STR;
 161
 162         if (strcmp(state, "Charging") == 0) {
 163                 return "+";
 164         } else if (strcmp(state, "Discharging") == 0) {
 165                 return "-";
 166         } else if (strcmp(state, "Full") == 0) {
 167                 return "=";
 168         } else if (strcmp(state, "Unknown") == 0) {
 169                 return "/";
 170         } else {
 171                 return "?";
 172         }
 173 }
 174
 175 static const char *
 176 cpu_freq(void)
 177 {
 178         int n, freq;
 179         FILE *fp;
 180
 181         fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
 182         if (fp == NULL) {
 183                 warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
 184                 return UNKNOWN_STR;
 185         }
 186         n = fscanf(fp, "%i", &freq);
 187         fclose(fp);
 188         if (n != 1)
 189                 return UNKNOWN_STR;
 190
 191         return bprintf("%d", (freq + 500) / 1000);
 192 }
 193
 194 static const char *
 195 cpu_perc(void)
 196 {
 197         int n, perc;
 198         long double a[4], b[4];
 199         FILE *fp;
 200
 201         fp = fopen("/proc/stat", "r");
 202         if (fp == NULL) {
 203                 warn("Failed to open file /proc/stat");
 204                 return UNKNOWN_STR;
 205         }
 206         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 207         fclose(fp);
 208         if (n != 4)
 209                 return UNKNOWN_STR;
 210
 211         delay++;
 212         sleep(delay);
 213
 214         fp = fopen("/proc/stat", "r");
 215         if (fp == NULL) {
 216                 warn("Failed to open file /proc/stat");
 217                 return UNKNOWN_STR;
 218         }
 219         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 220         fclose(fp);
 221         if (n != 4)
 222                 return UNKNOWN_STR;
 223
 224         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]));
 225         return bprintf("%d", perc);
 226 }
 227
 228 static const char *
 229 datetime(const char *fmt)
 230 {
 231         time_t t;
 232
 233         t = time(NULL);
 234         if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
 235                 return UNKNOWN_STR;
 236
 237         return buf;
 238 }
 239
 240 static const char *
 241 disk_free(const char *mnt)
 242 {
 243         struct statvfs fs;
 244
 245         if (statvfs(mnt, &fs) < 0) {
 246                 warn("Failed to get filesystem info");
 247                 return UNKNOWN_STR;
 248         }
 249
 250         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 251 }
 252
 253 static const char *
 254 disk_perc(const char *mnt)
 255 {
 256         int perc;
 257         struct statvfs fs;
 258
 259         if (statvfs(mnt, &fs) < 0) {
 260                 warn("Failed to get filesystem info");
 261                 return UNKNOWN_STR;
 262         }
 263
 264         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 265
 266         return bprintf("%d", perc);
 267 }
 268
 269 static const char *
 270 disk_total(const char *mnt)
 271 {
 272         struct statvfs fs;
 273
 274         if (statvfs(mnt, &fs) < 0) {
 275                 warn("Failed to get filesystem info");
 276                 return UNKNOWN_STR;
 277         }
 278
 279         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 280 }
 281
 282 static const char *
 283 disk_used(const char *mnt)
 284 {
 285         struct statvfs fs;
 286
 287         if (statvfs(mnt, &fs) < 0) {
 288                 warn("Failed to get filesystem info");
 289                 return UNKNOWN_STR;
 290         }
 291
 292         return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 293 }
 294
 295 static const char *
 296 entropy(void)
 297 {
 298         int n, num;
 299         FILE *fp;
 300
 301         fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
 302         if (fp == NULL) {
 303                 warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
 304                 return UNKNOWN_STR;
 305         }
 306         n = fscanf(fp, "%d", &num);
 307         fclose(fp);
 308         if (n != 1)
 309                 return UNKNOWN_STR;
 310
 311         return bprintf("%d", num);
 312 }
 313
 314 static const char *
 315 gid(void)
 316 {
 317         return bprintf("%d", getgid());
 318 }
 319
 320 static const char *
 321 hostname(void)
 322 {
 323         if (gethostname(buf, sizeof(buf)) == -1) {
 324                 warn("hostname");
 325                 return UNKNOWN_STR;
 326         }
 327
 328         return buf;
 329 }
 330
 331 static const char *
 332 ip(const char *iface)
 333 {
 334         struct ifaddrs *ifaddr, *ifa;
 335         int s;
 336         char host[NI_MAXHOST];
 337
 338         if (getifaddrs(&ifaddr) == -1) {
 339                 warn("Failed to get IP address for interface %s", iface);
 340                 return UNKNOWN_STR;
 341         }
 342
 343         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 344                 if (ifa->ifa_addr == NULL) {
 345                         continue;
 346                 }
 347                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 348                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 349                         if (s != 0) {
 350                                 warnx("Failed to get IP address for interface %s", iface);
 351                                 return UNKNOWN_STR;
 352                         }
 353                         return bprintf("%s", host);
 354                 }
 355         }
 356
 357         freeifaddrs(ifaddr);
 358
 359         return UNKNOWN_STR;
 360 }
 361
 362 static const char *
 363 kernel_release(void)
 364 {
 365         struct utsname udata;
 366
 367         if (uname(&udata) < 0) {
 368                 return UNKNOWN_STR;
 369         }
 370
 371         return bprintf("%s", udata.release);
 372 }
 373
 374 static const char *
 375 keyboard_indicators(void)
 376 {
 377         Display *dpy = XOpenDisplay(NULL);
 378         XKeyboardState state;
 379         XGetKeyboardControl(dpy, &state);
 380         XCloseDisplay(dpy);
 381
 382         switch (state.led_mask) {
 383                 case 1:
 384                         return "c";
 385                 case 2:
 386                         return "n";
 387                 case 3:
 388                         return "cn";
 389                 default:
 390                         return "";
 391         }
 392 }
 393
 394 static const char *
 395 load_avg(void)
 396 {
 397         double avgs[3];
 398
 399         if (getloadavg(avgs, 3) < 0) {
 400                 warnx("Failed to get the load avg");
 401                 return UNKNOWN_STR;
 402         }
 403
 404         return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 405 }
 406
 407 static const char *
 408 num_files(const char *dir)
 409 {
 410         struct dirent *dp;
 411         DIR *fd;
 412         int num = 0;
 413
 414         if ((fd = opendir(dir)) == NULL) {
 415                 warn("Failed to get number of files in directory %s", dir);
 416                 return UNKNOWN_STR;
 417         }
 418
 419         while ((dp = readdir(fd)) != NULL) {
 420                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 421                         continue; /* skip self and parent */
 422                 num++;
 423         }
 424
 425         closedir(fd);
 426
 427         return bprintf("%d", num);
 428 }
 429
 430 static const char *
 431 ram_free(void)
 432 {
 433         long free;
 434         FILE *fp;
 435         int n;
 436
 437         fp = fopen("/proc/meminfo", "r");
 438         if (fp == NULL) {
 439                 warn("Failed to open file /proc/meminfo");
 440                 return UNKNOWN_STR;
 441         }
 442         n = fscanf(fp, "MemFree: %ld kB\n", &free);
 443         fclose(fp);
 444         if (n != 1)
 445                 return UNKNOWN_STR;
 446
 447         return bprintf("%f", (float)free / 1024 / 1024);
 448 }
 449
 450 static const char *
 451 ram_perc(void)
 452 {
 453         long total, free, buffers, cached;
 454         FILE *fp;
 455
 456         fp = fopen("/proc/meminfo", "r");
 457         if (fp == NULL) {
 458                 warn("Failed to open file /proc/meminfo");
 459                 return UNKNOWN_STR;
 460         }
 461         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 462             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 463             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 464                    &buffers, &buffers) != 2 ||
 465             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 466                 goto scanerr;
 467         fclose(fp);
 468
 469         return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
 470
 471 scanerr:
 472         fclose(fp);
 473         return UNKNOWN_STR;
 474 }
 475
 476 static const char *
 477 ram_total(void)
 478 {
 479         long total;
 480         FILE *fp;
 481         int n;
 482
 483         fp = fopen("/proc/meminfo", "r");
 484         if (fp == NULL) {
 485                 warn("Failed to open file /proc/meminfo");
 486                 return UNKNOWN_STR;
 487         }
 488         n = fscanf(fp, "MemTotal: %ld kB\n", &total);
 489         fclose(fp);
 490         if (n != 1)
 491                 return UNKNOWN_STR;
 492
 493         return bprintf("%f", (float)total / 1024 / 1024);
 494 }
 495
 496 static const char *
 497 ram_used(void)
 498 {
 499         long free, total, buffers, cached;
 500         FILE *fp;
 501
 502         fp = fopen("/proc/meminfo", "r");
 503         if (fp == NULL) {
 504                 warn("Failed to open file /proc/meminfo");
 505                 return UNKNOWN_STR;
 506         }
 507         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 508             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 509             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 510                    &buffers, &buffers) != 2 ||
 511             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 512                 goto scanerr;
 513         fclose(fp);
 514
 515         return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 516
 517 scanerr:
 518         fclose(fp);
 519         return UNKNOWN_STR;
 520 }
 521
 522 static const char *
 523 run_command(const char *cmd)
 524 {
 525         char *p;
 526         FILE *fp;
 527
 528         fp = popen(cmd, "r");
 529         if (fp == NULL) {
 530                 warn("Failed to get command output for %s", cmd);
 531                 return UNKNOWN_STR;
 532         }
 533         p = fgets(buf, sizeof(buf) - 1, fp);
 534         pclose(fp);
 535         if (!p)
 536                 return UNKNOWN_STR;
 537         if ((p = strrchr(buf, '\n')) != NULL)
 538                 p[0] = '\0';
 539
 540         return buf[0] ? buf : UNKNOWN_STR;
 541 }
 542
 543 static const char *
 544 swap_free(void)
 545 {
 546         long total, free;
 547         FILE *fp;
 548         size_t bytes_read;
 549         char *match;
 550
 551         fp = fopen("/proc/meminfo", "r");
 552         if (fp == NULL) {
 553                 warn("Failed to open file /proc/meminfo");
 554                 return UNKNOWN_STR;
 555         }
 556
 557         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 558                 warn("swap_free: read error");
 559                 fclose(fp);
 560                 return UNKNOWN_STR;
 561         }
 562         fclose(fp);
 563
 564         if ((match = strstr(buf, "SwapTotal")) == NULL)
 565                 return UNKNOWN_STR;
 566         sscanf(match, "SwapTotal: %ld kB\n", &total);
 567
 568         if ((match = strstr(buf, "SwapFree")) == NULL)
 569                 return UNKNOWN_STR;
 570         sscanf(match, "SwapFree: %ld kB\n", &free);
 571
 572         return bprintf("%f", (float)free / 1024 / 1024);
 573 }
 574
 575 static const char *
 576 swap_perc(void)
 577 {
 578         long total, free, cached;
 579         FILE *fp;
 580         size_t bytes_read;
 581         char *match;
 582
 583         fp = fopen("/proc/meminfo", "r");
 584         if (fp == NULL) {
 585                 warn("Failed to open file /proc/meminfo");
 586                 return UNKNOWN_STR;
 587         }
 588
 589         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 590                 warn("swap_perc: read error");
 591                 fclose(fp);
 592                 return UNKNOWN_STR;
 593         }
 594         fclose(fp);
 595
 596         if ((match = strstr(buf, "SwapTotal")) == NULL)
 597                 return UNKNOWN_STR;
 598         sscanf(match, "SwapTotal: %ld kB\n", &total);
 599
 600         if ((match = strstr(buf, "SwapCached")) == NULL)
 601                 return UNKNOWN_STR;
 602         sscanf(match, "SwapCached: %ld kB\n", &cached);
 603
 604         if ((match = strstr(buf, "SwapFree")) == NULL)
 605                 return UNKNOWN_STR;
 606         sscanf(match, "SwapFree: %ld kB\n", &free);
 607
 608         return bprintf("%d", 100 * (total - free - cached) / total);
 609 }
 610
 611 static const char *
 612 swap_total(void)
 613 {
 614         long total;
 615         FILE *fp;
 616         size_t bytes_read;
 617         char *match;
 618
 619         fp = fopen("/proc/meminfo", "r");
 620         if (fp == NULL) {
 621                 warn("Failed to open file /proc/meminfo");
 622                 return UNKNOWN_STR;
 623         }
 624         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 625                 warn("swap_total: read error");
 626                 fclose(fp);
 627                 return UNKNOWN_STR;
 628         }
 629         fclose(fp);
 630
 631         if ((match = strstr(buf, "SwapTotal")) == NULL)
 632                 return UNKNOWN_STR;
 633         sscanf(match, "SwapTotal: %ld kB\n", &total);
 634
 635         return bprintf("%f", (float)total / 1024 / 1024);
 636 }
 637
 638 static const char *
 639 swap_used(void)
 640 {
 641         long total, free, cached;
 642         FILE *fp;
 643         size_t bytes_read;
 644         char *match;
 645
 646         fp = fopen("/proc/meminfo", "r");
 647         if (fp == NULL) {
 648                 warn("Failed to open file /proc/meminfo");
 649                 return UNKNOWN_STR;
 650         }
 651         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 652                 warn("swap_used: read error");
 653                 fclose(fp);
 654                 return UNKNOWN_STR;
 655         }
 656         fclose(fp);
 657
 658         if ((match = strstr(buf, "SwapTotal")) == NULL)
 659                 return UNKNOWN_STR;
 660         sscanf(match, "SwapTotal: %ld kB\n", &total);
 661
 662         if ((match = strstr(buf, "SwapCached")) == NULL)
 663                 return UNKNOWN_STR;
 664         sscanf(match, "SwapCached: %ld kB\n", &cached);
 665
 666         if ((match = strstr(buf, "SwapFree")) == NULL)
 667                 return UNKNOWN_STR;
 668         sscanf(match, "SwapFree: %ld kB\n", &free);
 669
 670         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 671 }
 672
 673 static const char *
 674 temp(const char *file)
 675 {
 676         int n, temp;
 677         FILE *fp;
 678
 679         fp = fopen(file, "r");
 680         if (fp == NULL) {
 681                 warn("Failed to open file %s", file);
 682                 return UNKNOWN_STR;
 683         }
 684         n = fscanf(fp, "%d", &temp);
 685         fclose(fp);
 686         if (n != 1)
 687                 return UNKNOWN_STR;
 688
 689         return bprintf("%d", temp / 1000);
 690 }
 691
 692 static const char *
 693 uptime(void)
 694 {
 695         struct sysinfo info;
 696         int h = 0;
 697         int m = 0;
 698
 699         sysinfo(&info);
 700         h = info.uptime / 3600;
 701         m = (info.uptime - h * 3600 ) / 60;
 702
 703         return bprintf("%dh %dm", h, m);
 704 }
 705
 706 static const char *
 707 username(void)
 708 {
 709         struct passwd *pw = getpwuid(geteuid());
 710
 711         if (pw == NULL) {
 712                 warn("Failed to get username");
 713                 return UNKNOWN_STR;
 714         }
 715
 716         return bprintf("%s", pw->pw_name);
 717 }
 718
 719 static const char *
 720 uid(void)
 721 {
 722         return bprintf("%d", geteuid());
 723 }
 724
 725
 726 static const char *
 727 vol_perc(const char *card)
 728 {
 729         unsigned int i;
 730         int v, afd, devmask;
 731         char *vnames[] = SOUND_DEVICE_NAMES;
 732
 733         afd = open(card, O_RDONLY | O_NONBLOCK);
 734         if (afd == -1) {
 735                 warn("Cannot open %s", card);
 736                 return UNKNOWN_STR;
 737         }
 738
 739         if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
 740                 warn("Cannot get volume for %s", card);
 741                 close(afd);
 742                 return UNKNOWN_STR;
 743         }
 744         for (i = 0; i < (sizeof(vnames) / sizeof((vnames[0]))); i++) {
 745                 if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
 746                         if (ioctl(afd, MIXER_READ(i), &v) == -1) {
 747                                 warn("vol_perc: ioctl");
 748                                 close(afd);
 749                                 return UNKNOWN_STR;
 750                         }
 751                 }
 752         }
 753
 754         close(afd);
 755
 756         return bprintf("%d", v & 0xff);
 757 }
 758
 759 static const char *
 760 wifi_perc(const char *iface)
 761 {
 762         int i, perc;
 763         char *p, *datastart;
 764         char path[PATH_MAX];
 765         char status[5];
 766         FILE *fp;
 767
 768         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
 769         fp = fopen(path, "r");
 770         if (fp == NULL) {
 771                 warn("Failed to open file %s", path);
 772                 return UNKNOWN_STR;
 773         }
 774         p = fgets(status, 5, fp);
 775         fclose(fp);
 776         if(!p || strcmp(status, "up\n") != 0) {
 777                 return UNKNOWN_STR;
 778         }
 779
 780         fp = fopen("/proc/net/wireless", "r");
 781         if (fp == NULL) {
 782                 warn("Failed to open file /proc/net/wireless");
 783                 return UNKNOWN_STR;
 784         }
 785
 786         for (i = 0; i < 3; i++) {
 787                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 788                         break;
 789         }
 790         fclose(fp);
 791         if (i < 2 || !p)
 792                 return UNKNOWN_STR;
 793
 794         if ((datastart = strstr(buf, iface)) == NULL)
 795                 return UNKNOWN_STR;
 796
 797         datastart = (datastart+(strlen(iface)+1));
 798         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 799
 800         return bprintf("%d", perc);
 801 }
 802
 803 static const char *
 804 wifi_essid(const char *iface)
 805 {
 806         static char id[IW_ESSID_MAX_SIZE+1];
 807         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 808         struct iwreq wreq;
 809
 810         memset(&wreq, 0, sizeof(struct iwreq));
 811         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 812         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 813
 814         if (sockfd == -1) {
 815                 warn("Failed to get ESSID for interface %s", iface);
 816                 return UNKNOWN_STR;
 817         }
 818         wreq.u.essid.pointer = id;
 819         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 820                 warn("Failed to get ESSID for interface %s", iface);
 821                 return UNKNOWN_STR;
 822         }
 823
 824         close(sockfd);
 825
 826         if (strcmp(id, "") == 0)
 827                 return UNKNOWN_STR;
 828         else
 829                 return id;
 830 }
 831
 832 static void
 833 sighandler(const int signo)
 834 {
 835         if (signo == SIGTERM || signo == SIGINT) {
 836                 done = 1;
 837         }
 838 }
 839
 840 static void
 841 usage(void)
 842 {
 843         fprintf(stderr, "usage: %s [-d] [-o] [-n] [-v] [-h]\n", argv0);
 844         exit(1);
 845 }
 846
 847 int
 848 main(int argc, char *argv[])
 849 {
 850         unsigned short int i;
 851         char status_string[MAXLEN];
 852         char *element;
 853         struct arg argument;
 854         struct sigaction act;
 855         size_t len;
 856
 857         ARGBEGIN {
 858                 case 'd':
 859                         dflag = 1;
 860                         break;
 861                 case 'o':
 862                         oflag = 1;
 863                         break;
 864                 case 'n':
 865                         nflag = 1;
 866                         break;
 867                 case 'v':
 868                         printf("slstatus-"VERSION"\n");
 869                         return 0;
 870                 default:
 871                         usage();
 872         } ARGEND
 873
 874         if ((dflag && oflag) || (dflag && nflag) || (oflag && nflag)) {
 875                 usage();
 876         }
 877         if (dflag && daemon(1, 1) < 0) {
 878                 err(1, "daemon");
 879         }
 880
 881         memset(&act, 0, sizeof(act));
 882         act.sa_handler = sighandler;
 883         sigaction(SIGINT,  &act, 0);
 884         sigaction(SIGTERM, &act, 0);
 885
 886         if (!oflag) {
 887                 dpy = XOpenDisplay(NULL);
 888         }
 889
 890         setlocale(LC_ALL, "");
 891
 892         while (!done) {
 893                 status_string[0] = '\0';
 894
 895                 for (element = status_string, i = len = 0;
 896                      i < sizeof(args) / sizeof(args[0]);
 897                      ++i, element += len) {
 898                         argument = args[i];
 899                         len = snprintf(element, sizeof(status_string)-1 - len,
 900                                        argument.fmt,
 901                                        argument.func(argument.args));
 902                         if (len >= sizeof(status_string)) {
 903                                 status_string[sizeof(status_string)-1] = '\0';
 904                                 break;
 905                         }
 906                 }
 907
 908                 if (oflag) {
 909                         printf("%s\n", status_string);
 910                 } else if (nflag) {
 911                         printf("%s\n", status_string);
 912                         done = 1;
 913                 } else {
 914                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 915                         XSync(dpy, False);
 916                 }
 917
 918                 if ((UPDATE_INTERVAL - delay) <= 0) {
 919                         delay = 0;
 920                         continue;
 921                 } else {
 922                         sleep(UPDATE_INTERVAL - delay);
 923                         delay = 0;
 924                 }
 925         }
 926
 927         if (!oflag) {
 928                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 929                 XCloseDisplay(dpy);
 930         }
 931
 932         return 0;
 933 }