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