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 #define LEN(x) (sizeof (x) / sizeof *(x))
  32
  33 struct arg {
  34         const char *(*func)();
  35         const char *fmt;
  36         const char *args;
  37 };
  38
  39 static const char *bprintf(const char *fmt, ...);
  40 static const char *battery_perc(const char *bat);
  41 static const char *battery_power(const char *bat);
  42 static const char *battery_state(const char *bat);
  43 static const char *cpu_freq(void);
  44 static const char *cpu_perc(void);
  45 static const char *datetime(const char *fmt);
  46 static const char *disk_free(const char *mnt);
  47 static const char *disk_perc(const char *mnt);
  48 static const char *disk_total(const char *mnt);
  49 static const char *disk_used(const char *mnt);
  50 static const char *entropy(void);
  51 static const char *gid(void);
  52 static const char *hostname(void);
  53 static const char *ip(const char *iface);
  54 static const char *kernel_release(void);
  55 static const char *keyboard_indicators(void);
  56 static const char *load_avg(void);
  57 static const char *num_files(const char *dir);
  58 static const char *ram_free(void);
  59 static const char *ram_perc(void);
  60 static const char *ram_used(void);
  61 static const char *ram_total(void);
  62 static const char *run_command(const char *cmd);
  63 static const char *swap_free(void);
  64 static const char *swap_perc(void);
  65 static const char *swap_used(void);
  66 static const char *swap_total(void);
  67 static const char *temp(const char *file);
  68 static const char *uid(void);
  69 static const char *uptime(void);
  70 static const char *username(void);
  71 static const char *vol_perc(const char *card);
  72 static const char *wifi_perc(const char *iface);
  73 static const char *wifi_essid(const char *iface);
  74 static void sighandler(const int signo);
  75 static void usage(void);
  76
  77 char *argv0;
  78 static unsigned short int delay = 0;
  79 static unsigned short int done;
  80 static Display *dpy;
  81
  82 #include "config.h"
  83
  84 static char buf[MAXLEN];
  85
  86 static const char *
  87 bprintf(const char *fmt, ...)
  88 {
  89         va_list ap;
  90         size_t len;
  91
  92         va_start(ap, fmt);
  93         len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
  94         va_end(ap);
  95
  96         if (len >= sizeof(buf))
  97                 buf[sizeof(buf)-1] = '\0';
  98
  99         return buf;
 100 }
 101
 102 static const char *
 103 battery_perc(const char *bat)
 104 {
 105         int n, perc;
 106         char path[PATH_MAX];
 107         FILE *fp;
 108
 109         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
 110         fp = fopen(path, "r");
 111         if (fp == NULL) {
 112                 warn("Failed to open file %s", path);
 113                 return unknown_str;
 114         }
 115         n = fscanf(fp, "%i", &perc);
 116         fclose(fp);
 117         if (n != 1)
 118                 return unknown_str;
 119
 120         return bprintf("%d", perc);
 121 }
 122
 123 static const char *
 124 battery_power(const char *bat)
 125 {
 126         char path[PATH_MAX];
 127         FILE *fp;
 128         int n, watts;
 129
 130         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
 131         fp = fopen(path, "r");
 132         if (fp == NULL) {
 133                 warn("Failed to open file %s", path);
 134                 return unknown_str;
 135         }
 136         n = fscanf(fp, "%i", &watts);
 137         fclose(fp);
 138         if (n != 1)
 139                 return unknown_str;
 140
 141         return bprintf("%d", (watts + 500000) / 1000000);
 142 }
 143
 144 static const char *
 145 battery_state(const char *bat)
 146 {
 147         FILE *fp;
 148         struct {
 149                 char *state;
 150                 char *symbol;
 151         } map[] = {
 152                 { "Charging",    "+" },
 153                 { "Discharging", "-" },
 154                 { "Full",        "=" },
 155                 { "Unknown",     "/" },
 156         };
 157         size_t i;
 158         int n;
 159         char path[PATH_MAX], state[12];
 160
 161         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
 162         fp = fopen(path, "r");
 163         if (fp == NULL) {
 164                 warn("Failed to open file %s", path);
 165                 return unknown_str;
 166         }
 167         n = fscanf(fp, "%12s", state);
 168         fclose(fp);
 169         if (n != 1)
 170                 return unknown_str;
 171
 172         for (i = 0; i < LEN(map); i++) {
 173                 if (!strcmp(map[i].state, state)) {
 174                         break;
 175                 }
 176         }
 177
 178         return (i == LEN(map)) ? "?" : map[i].symbol;
 179 }
 180
 181 static const char *
 182 cpu_freq(void)
 183 {
 184         int n, freq;
 185         FILE *fp;
 186
 187         fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
 188         if (fp == NULL) {
 189                 warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
 190                 return unknown_str;
 191         }
 192         n = fscanf(fp, "%i", &freq);
 193         fclose(fp);
 194         if (n != 1)
 195                 return unknown_str;
 196
 197         return bprintf("%d", (freq + 500) / 1000);
 198 }
 199
 200 static const char *
 201 cpu_perc(void)
 202 {
 203         int n, perc;
 204         long double a[4], b[4];
 205         FILE *fp;
 206
 207         fp = fopen("/proc/stat", "r");
 208         if (fp == NULL) {
 209                 warn("Failed to open file /proc/stat");
 210                 return unknown_str;
 211         }
 212         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 213         fclose(fp);
 214         if (n != 4)
 215                 return unknown_str;
 216
 217         delay++;
 218         sleep(delay);
 219
 220         fp = fopen("/proc/stat", "r");
 221         if (fp == NULL) {
 222                 warn("Failed to open file /proc/stat");
 223                 return unknown_str;
 224         }
 225         n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 226         fclose(fp);
 227         if (n != 4)
 228                 return unknown_str;
 229
 230         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]));
 231         return bprintf("%d", perc);
 232 }
 233
 234 static const char *
 235 datetime(const char *fmt)
 236 {
 237         time_t t;
 238
 239         t = time(NULL);
 240         if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
 241                 return unknown_str;
 242
 243         return buf;
 244 }
 245
 246 static const char *
 247 disk_free(const char *mnt)
 248 {
 249         struct statvfs fs;
 250
 251         if (statvfs(mnt, &fs) < 0) {
 252                 warn("Failed to get filesystem info");
 253                 return unknown_str;
 254         }
 255
 256         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 257 }
 258
 259 static const char *
 260 disk_perc(const char *mnt)
 261 {
 262         int perc;
 263         struct statvfs fs;
 264
 265         if (statvfs(mnt, &fs) < 0) {
 266                 warn("Failed to get filesystem info");
 267                 return unknown_str;
 268         }
 269
 270         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 271
 272         return bprintf("%d", perc);
 273 }
 274
 275 static const char *
 276 disk_total(const char *mnt)
 277 {
 278         struct statvfs fs;
 279
 280         if (statvfs(mnt, &fs) < 0) {
 281                 warn("Failed to get filesystem info");
 282                 return unknown_str;
 283         }
 284
 285         return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 286 }
 287
 288 static const char *
 289 disk_used(const char *mnt)
 290 {
 291         struct statvfs fs;
 292
 293         if (statvfs(mnt, &fs) < 0) {
 294                 warn("Failed to get filesystem info");
 295                 return unknown_str;
 296         }
 297
 298         return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 299 }
 300
 301 static const char *
 302 entropy(void)
 303 {
 304         int n, num;
 305         FILE *fp;
 306
 307         fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
 308         if (fp == NULL) {
 309                 warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
 310                 return unknown_str;
 311         }
 312         n = fscanf(fp, "%d", &num);
 313         fclose(fp);
 314         if (n != 1)
 315                 return unknown_str;
 316
 317         return bprintf("%d", num);
 318 }
 319
 320 static const char *
 321 gid(void)
 322 {
 323         return bprintf("%d", getgid());
 324 }
 325
 326 static const char *
 327 hostname(void)
 328 {
 329         if (gethostname(buf, sizeof(buf)) == -1) {
 330                 warn("hostname");
 331                 return unknown_str;
 332         }
 333
 334         return buf;
 335 }
 336
 337 static const char *
 338 ip(const char *iface)
 339 {
 340         struct ifaddrs *ifaddr, *ifa;
 341         int s;
 342         char host[NI_MAXHOST];
 343
 344         if (getifaddrs(&ifaddr) == -1) {
 345                 warn("Failed to get IP address for interface %s", iface);
 346                 return unknown_str;
 347         }
 348
 349         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 350                 if (ifa->ifa_addr == NULL) {
 351                         continue;
 352                 }
 353                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 354                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 355                         if (s != 0) {
 356                                 warnx("Failed to get IP address for interface %s", iface);
 357                                 return unknown_str;
 358                         }
 359                         return bprintf("%s", host);
 360                 }
 361         }
 362
 363         freeifaddrs(ifaddr);
 364
 365         return unknown_str;
 366 }
 367
 368 static const char *
 369 kernel_release(void)
 370 {
 371         struct utsname udata;
 372
 373         if (uname(&udata) < 0) {
 374                 return unknown_str;
 375         }
 376
 377         return bprintf("%s", udata.release);
 378 }
 379
 380 static const char *
 381 keyboard_indicators(void)
 382 {
 383         Display *dpy = XOpenDisplay(NULL);
 384         XKeyboardState state;
 385
 386         if (dpy == NULL) {
 387                 warnx("XOpenDisplay failed");
 388                 return unknown_str;
 389         }
 390         XGetKeyboardControl(dpy, &state);
 391         XCloseDisplay(dpy);
 392
 393         switch (state.led_mask) {
 394                 case 1:
 395                         return "c";
 396                 case 2:
 397                         return "n";
 398                 case 3:
 399                         return "cn";
 400                 default:
 401                         return "";
 402         }
 403 }
 404
 405 static const char *
 406 load_avg(void)
 407 {
 408         double avgs[3];
 409
 410         if (getloadavg(avgs, 3) < 0) {
 411                 warnx("Failed to get the load avg");
 412                 return unknown_str;
 413         }
 414
 415         return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 416 }
 417
 418 static const char *
 419 num_files(const char *dir)
 420 {
 421         struct dirent *dp;
 422         DIR *fd;
 423         int num = 0;
 424
 425         if ((fd = opendir(dir)) == NULL) {
 426                 warn("Failed to get number of files in directory %s", dir);
 427                 return unknown_str;
 428         }
 429
 430         while ((dp = readdir(fd)) != NULL) {
 431                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 432                         continue; /* skip self and parent */
 433                 num++;
 434         }
 435
 436         closedir(fd);
 437
 438         return bprintf("%d", num);
 439 }
 440
 441 static const char *
 442 ram_free(void)
 443 {
 444         long free;
 445         FILE *fp;
 446         int n;
 447
 448         fp = fopen("/proc/meminfo", "r");
 449         if (fp == NULL) {
 450                 warn("Failed to open file /proc/meminfo");
 451                 return unknown_str;
 452         }
 453         n = fscanf(fp, "MemFree: %ld kB\n", &free);
 454         fclose(fp);
 455         if (n != 1)
 456                 return unknown_str;
 457
 458         return bprintf("%f", (float)free / 1024 / 1024);
 459 }
 460
 461 static const char *
 462 ram_perc(void)
 463 {
 464         long total, free, buffers, cached;
 465         FILE *fp;
 466
 467         fp = fopen("/proc/meminfo", "r");
 468         if (fp == NULL) {
 469                 warn("Failed to open file /proc/meminfo");
 470                 return unknown_str;
 471         }
 472         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 473             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 474             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 475                    &buffers, &buffers) != 2 ||
 476             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 477                 goto scanerr;
 478         fclose(fp);
 479
 480         return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
 481
 482 scanerr:
 483         fclose(fp);
 484         return unknown_str;
 485 }
 486
 487 static const char *
 488 ram_total(void)
 489 {
 490         long total;
 491         FILE *fp;
 492         int n;
 493
 494         fp = fopen("/proc/meminfo", "r");
 495         if (fp == NULL) {
 496                 warn("Failed to open file /proc/meminfo");
 497                 return unknown_str;
 498         }
 499         n = fscanf(fp, "MemTotal: %ld kB\n", &total);
 500         fclose(fp);
 501         if (n != 1)
 502                 return unknown_str;
 503
 504         return bprintf("%f", (float)total / 1024 / 1024);
 505 }
 506
 507 static const char *
 508 ram_used(void)
 509 {
 510         long free, total, buffers, cached;
 511         FILE *fp;
 512
 513         fp = fopen("/proc/meminfo", "r");
 514         if (fp == NULL) {
 515                 warn("Failed to open file /proc/meminfo");
 516                 return unknown_str;
 517         }
 518         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 519             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 520             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 521                    &buffers, &buffers) != 2 ||
 522             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 523                 goto scanerr;
 524         fclose(fp);
 525
 526         return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 527
 528 scanerr:
 529         fclose(fp);
 530         return unknown_str;
 531 }
 532
 533 static const char *
 534 run_command(const char *cmd)
 535 {
 536         char *p;
 537         FILE *fp;
 538
 539         fp = popen(cmd, "r");
 540         if (fp == NULL) {
 541                 warn("Failed to get command output for %s", cmd);
 542                 return unknown_str;
 543         }
 544         p = fgets(buf, sizeof(buf) - 1, fp);
 545         pclose(fp);
 546         if (!p)
 547                 return unknown_str;
 548         if ((p = strrchr(buf, '\n')) != NULL)
 549                 p[0] = '\0';
 550
 551         return buf[0] ? buf : unknown_str;
 552 }
 553
 554 static const char *
 555 swap_free(void)
 556 {
 557         long total, free;
 558         FILE *fp;
 559         size_t bytes_read;
 560         char *match;
 561
 562         fp = fopen("/proc/meminfo", "r");
 563         if (fp == NULL) {
 564                 warn("Failed to open file /proc/meminfo");
 565                 return unknown_str;
 566         }
 567
 568         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 569                 warn("swap_free: read error");
 570                 fclose(fp);
 571                 return unknown_str;
 572         }
 573         fclose(fp);
 574
 575         if ((match = strstr(buf, "SwapTotal")) == NULL)
 576                 return unknown_str;
 577         sscanf(match, "SwapTotal: %ld kB\n", &total);
 578
 579         if ((match = strstr(buf, "SwapFree")) == NULL)
 580                 return unknown_str;
 581         sscanf(match, "SwapFree: %ld kB\n", &free);
 582
 583         return bprintf("%f", (float)free / 1024 / 1024);
 584 }
 585
 586 static const char *
 587 swap_perc(void)
 588 {
 589         long total, free, cached;
 590         FILE *fp;
 591         size_t bytes_read;
 592         char *match;
 593
 594         fp = fopen("/proc/meminfo", "r");
 595         if (fp == NULL) {
 596                 warn("Failed to open file /proc/meminfo");
 597                 return unknown_str;
 598         }
 599
 600         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 601                 warn("swap_perc: read error");
 602                 fclose(fp);
 603                 return unknown_str;
 604         }
 605         fclose(fp);
 606
 607         if ((match = strstr(buf, "SwapTotal")) == NULL)
 608                 return unknown_str;
 609         sscanf(match, "SwapTotal: %ld kB\n", &total);
 610
 611         if ((match = strstr(buf, "SwapCached")) == NULL)
 612                 return unknown_str;
 613         sscanf(match, "SwapCached: %ld kB\n", &cached);
 614
 615         if ((match = strstr(buf, "SwapFree")) == NULL)
 616                 return unknown_str;
 617         sscanf(match, "SwapFree: %ld kB\n", &free);
 618
 619         return bprintf("%d", 100 * (total - free - cached) / total);
 620 }
 621
 622 static const char *
 623 swap_total(void)
 624 {
 625         long total;
 626         FILE *fp;
 627         size_t bytes_read;
 628         char *match;
 629
 630         fp = fopen("/proc/meminfo", "r");
 631         if (fp == NULL) {
 632                 warn("Failed to open file /proc/meminfo");
 633                 return unknown_str;
 634         }
 635         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 636                 warn("swap_total: read error");
 637                 fclose(fp);
 638                 return unknown_str;
 639         }
 640         fclose(fp);
 641
 642         if ((match = strstr(buf, "SwapTotal")) == NULL)
 643                 return unknown_str;
 644         sscanf(match, "SwapTotal: %ld kB\n", &total);
 645
 646         return bprintf("%f", (float)total / 1024 / 1024);
 647 }
 648
 649 static const char *
 650 swap_used(void)
 651 {
 652         long total, free, cached;
 653         FILE *fp;
 654         size_t bytes_read;
 655         char *match;
 656
 657         fp = fopen("/proc/meminfo", "r");
 658         if (fp == NULL) {
 659                 warn("Failed to open file /proc/meminfo");
 660                 return unknown_str;
 661         }
 662         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 663                 warn("swap_used: read error");
 664                 fclose(fp);
 665                 return unknown_str;
 666         }
 667         fclose(fp);
 668
 669         if ((match = strstr(buf, "SwapTotal")) == NULL)
 670                 return unknown_str;
 671         sscanf(match, "SwapTotal: %ld kB\n", &total);
 672
 673         if ((match = strstr(buf, "SwapCached")) == NULL)
 674                 return unknown_str;
 675         sscanf(match, "SwapCached: %ld kB\n", &cached);
 676
 677         if ((match = strstr(buf, "SwapFree")) == NULL)
 678                 return unknown_str;
 679         sscanf(match, "SwapFree: %ld kB\n", &free);
 680
 681         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 682 }
 683
 684 static const char *
 685 temp(const char *file)
 686 {
 687         int n, temp;
 688         FILE *fp;
 689
 690         fp = fopen(file, "r");
 691         if (fp == NULL) {
 692                 warn("Failed to open file %s", file);
 693                 return unknown_str;
 694         }
 695         n = fscanf(fp, "%d", &temp);
 696         fclose(fp);
 697         if (n != 1)
 698                 return unknown_str;
 699
 700         return bprintf("%d", temp / 1000);
 701 }
 702
 703 static const char *
 704 uptime(void)
 705 {
 706         struct sysinfo info;
 707         int h = 0;
 708         int m = 0;
 709
 710         sysinfo(&info);
 711         h = info.uptime / 3600;
 712         m = (info.uptime - h * 3600 ) / 60;
 713
 714         return bprintf("%dh %dm", h, m);
 715 }
 716
 717 static const char *
 718 username(void)
 719 {
 720         struct passwd *pw = getpwuid(geteuid());
 721
 722         if (pw == NULL) {
 723                 warn("Failed to get username");
 724                 return unknown_str;
 725         }
 726
 727         return bprintf("%s", pw->pw_name);
 728 }
 729
 730 static const char *
 731 uid(void)
 732 {
 733         return bprintf("%d", geteuid());
 734 }
 735
 736
 737 static const char *
 738 vol_perc(const char *card)
 739 {
 740         unsigned int i;
 741         int v, afd, devmask;
 742         char *vnames[] = SOUND_DEVICE_NAMES;
 743
 744         afd = open(card, O_RDONLY | O_NONBLOCK);
 745         if (afd == -1) {
 746                 warn("Cannot open %s", card);
 747                 return unknown_str;
 748         }
 749
 750         if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
 751                 warn("Cannot get volume for %s", card);
 752                 close(afd);
 753                 return unknown_str;
 754         }
 755         for (i = 0; i < LEN(vnames); i++) {
 756                 if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
 757                         if (ioctl(afd, MIXER_READ(i), &v) == -1) {
 758                                 warn("vol_perc: ioctl");
 759                                 close(afd);
 760                                 return unknown_str;
 761                         }
 762                 }
 763         }
 764
 765         close(afd);
 766
 767         return bprintf("%d", v & 0xff);
 768 }
 769
 770 static const char *
 771 wifi_perc(const char *iface)
 772 {
 773         int i, perc;
 774         char *p, *datastart;
 775         char path[PATH_MAX];
 776         char status[5];
 777         FILE *fp;
 778
 779         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
 780         fp = fopen(path, "r");
 781         if (fp == NULL) {
 782                 warn("Failed to open file %s", path);
 783                 return unknown_str;
 784         }
 785         p = fgets(status, 5, fp);
 786         fclose(fp);
 787         if(!p || strcmp(status, "up\n") != 0) {
 788                 return unknown_str;
 789         }
 790
 791         fp = fopen("/proc/net/wireless", "r");
 792         if (fp == NULL) {
 793                 warn("Failed to open file /proc/net/wireless");
 794                 return unknown_str;
 795         }
 796
 797         for (i = 0; i < 3; i++) {
 798                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 799                         break;
 800         }
 801         fclose(fp);
 802         if (i < 2 || !p)
 803                 return unknown_str;
 804
 805         if ((datastart = strstr(buf, iface)) == NULL)
 806                 return unknown_str;
 807
 808         datastart = (datastart+(strlen(iface)+1));
 809         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 810
 811         return bprintf("%d", perc);
 812 }
 813
 814 static const char *
 815 wifi_essid(const char *iface)
 816 {
 817         static char id[IW_ESSID_MAX_SIZE+1];
 818         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 819         struct iwreq wreq;
 820
 821         memset(&wreq, 0, sizeof(struct iwreq));
 822         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 823         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 824
 825         if (sockfd == -1) {
 826                 warn("Failed to get ESSID for interface %s", iface);
 827                 return unknown_str;
 828         }
 829         wreq.u.essid.pointer = id;
 830         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 831                 warn("Failed to get ESSID for interface %s", iface);
 832                 return unknown_str;
 833         }
 834
 835         close(sockfd);
 836
 837         if (strcmp(id, "") == 0)
 838                 return unknown_str;
 839         else
 840                 return id;
 841 }
 842
 843 static void
 844 sighandler(const int signo)
 845 {
 846         if (signo == SIGTERM || signo == SIGINT) {
 847                 done = 1;
 848         }
 849 }
 850
 851 static void
 852 usage(void)
 853 {
 854         fprintf(stderr, "usage: %s [-s]\n", argv0);
 855         exit(1);
 856 }
 857
 858 int
 859 main(int argc, char *argv[])
 860 {
 861         struct arg argument;
 862         struct sigaction act;
 863         size_t i, len;
 864         int sflag = 0;
 865         char status_string[MAXLEN];
 866         char *element;
 867
 868         ARGBEGIN {
 869                 case 's':
 870                         sflag = 1;
 871                         break;
 872                 default:
 873                         usage();
 874         } ARGEND
 875
 876         if (argc) {
 877                 usage();
 878         }
 879
 880         memset(&act, 0, sizeof(act));
 881         act.sa_handler = sighandler;
 882         sigaction(SIGINT,  &act, 0);
 883         sigaction(SIGTERM, &act, 0);
 884
 885         if (!sflag) {
 886                 dpy = XOpenDisplay(NULL);
 887                 if (!dpy) {
 888                         fprintf(stderr, "slstatus: cannot open display");
 889                         exit(1);
 890                 }
 891         }
 892
 893         setlocale(LC_ALL, "");
 894
 895         while (!done) {
 896                 status_string[0] = '\0';
 897
 898                 for (element = status_string, i = len = 0; i < LEN(args);
 899                      ++i, element += len) {
 900                         argument = args[i];
 901                         len = snprintf(element, sizeof(status_string)-1 - len,
 902                                        argument.fmt,
 903                                        argument.func(argument.args));
 904                         if (len >= sizeof(status_string)) {
 905                                 status_string[sizeof(status_string)-1] = '\0';
 906                                 break;
 907                         }
 908                 }
 909
 910                 if (sflag) {
 911                         printf("%s\n", status_string);
 912                 } else {
 913                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 914                         XSync(dpy, False);
 915                 }
 916
 917                 if ((update_interval - delay) <= 0) {
 918                         delay = 0;
 919                         continue;
 920                 } else {
 921                         sleep(update_interval - delay);
 922                         delay = 0;
 923                 }
 924         }
 925
 926         if (!sflag) {
 927                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 928                 XCloseDisplay(dpy);
 929         }
 930
 931         return 0;
 932 }