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         XGetKeyboardControl(dpy, &state);
 386         XCloseDisplay(dpy);
 387
 388         switch (state.led_mask) {
 389                 case 1:
 390                         return "c";
 391                 case 2:
 392                         return "n";
 393                 case 3:
 394                         return "cn";
 395                 default:
 396                         return "";
 397         }
 398 }
 399
 400 static const char *
 401 load_avg(void)
 402 {
 403         double avgs[3];
 404
 405         if (getloadavg(avgs, 3) < 0) {
 406                 warnx("Failed to get the load avg");
 407                 return UNKNOWN_STR;
 408         }
 409
 410         return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 411 }
 412
 413 static const char *
 414 num_files(const char *dir)
 415 {
 416         struct dirent *dp;
 417         DIR *fd;
 418         int num = 0;
 419
 420         if ((fd = opendir(dir)) == NULL) {
 421                 warn("Failed to get number of files in directory %s", dir);
 422                 return UNKNOWN_STR;
 423         }
 424
 425         while ((dp = readdir(fd)) != NULL) {
 426                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 427                         continue; /* skip self and parent */
 428                 num++;
 429         }
 430
 431         closedir(fd);
 432
 433         return bprintf("%d", num);
 434 }
 435
 436 static const char *
 437 ram_free(void)
 438 {
 439         long free;
 440         FILE *fp;
 441         int n;
 442
 443         fp = fopen("/proc/meminfo", "r");
 444         if (fp == NULL) {
 445                 warn("Failed to open file /proc/meminfo");
 446                 return UNKNOWN_STR;
 447         }
 448         n = fscanf(fp, "MemFree: %ld kB\n", &free);
 449         fclose(fp);
 450         if (n != 1)
 451                 return UNKNOWN_STR;
 452
 453         return bprintf("%f", (float)free / 1024 / 1024);
 454 }
 455
 456 static const char *
 457 ram_perc(void)
 458 {
 459         long total, free, buffers, cached;
 460         FILE *fp;
 461
 462         fp = fopen("/proc/meminfo", "r");
 463         if (fp == NULL) {
 464                 warn("Failed to open file /proc/meminfo");
 465                 return UNKNOWN_STR;
 466         }
 467         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 468             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 469             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 470                    &buffers, &buffers) != 2 ||
 471             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 472                 goto scanerr;
 473         fclose(fp);
 474
 475         return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
 476
 477 scanerr:
 478         fclose(fp);
 479         return UNKNOWN_STR;
 480 }
 481
 482 static const char *
 483 ram_total(void)
 484 {
 485         long total;
 486         FILE *fp;
 487         int n;
 488
 489         fp = fopen("/proc/meminfo", "r");
 490         if (fp == NULL) {
 491                 warn("Failed to open file /proc/meminfo");
 492                 return UNKNOWN_STR;
 493         }
 494         n = fscanf(fp, "MemTotal: %ld kB\n", &total);
 495         fclose(fp);
 496         if (n != 1)
 497                 return UNKNOWN_STR;
 498
 499         return bprintf("%f", (float)total / 1024 / 1024);
 500 }
 501
 502 static const char *
 503 ram_used(void)
 504 {
 505         long free, total, buffers, cached;
 506         FILE *fp;
 507
 508         fp = fopen("/proc/meminfo", "r");
 509         if (fp == NULL) {
 510                 warn("Failed to open file /proc/meminfo");
 511                 return UNKNOWN_STR;
 512         }
 513         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 514             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 515             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 516                    &buffers, &buffers) != 2 ||
 517             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 518                 goto scanerr;
 519         fclose(fp);
 520
 521         return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 522
 523 scanerr:
 524         fclose(fp);
 525         return UNKNOWN_STR;
 526 }
 527
 528 static const char *
 529 run_command(const char *cmd)
 530 {
 531         char *p;
 532         FILE *fp;
 533
 534         fp = popen(cmd, "r");
 535         if (fp == NULL) {
 536                 warn("Failed to get command output for %s", cmd);
 537                 return UNKNOWN_STR;
 538         }
 539         p = fgets(buf, sizeof(buf) - 1, fp);
 540         pclose(fp);
 541         if (!p)
 542                 return UNKNOWN_STR;
 543         if ((p = strrchr(buf, '\n')) != NULL)
 544                 p[0] = '\0';
 545
 546         return buf[0] ? buf : UNKNOWN_STR;
 547 }
 548
 549 static const char *
 550 swap_free(void)
 551 {
 552         long total, free;
 553         FILE *fp;
 554         size_t bytes_read;
 555         char *match;
 556
 557         fp = fopen("/proc/meminfo", "r");
 558         if (fp == NULL) {
 559                 warn("Failed to open file /proc/meminfo");
 560                 return UNKNOWN_STR;
 561         }
 562
 563         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 564                 warn("swap_free: read error");
 565                 fclose(fp);
 566                 return UNKNOWN_STR;
 567         }
 568         fclose(fp);
 569
 570         if ((match = strstr(buf, "SwapTotal")) == NULL)
 571                 return UNKNOWN_STR;
 572         sscanf(match, "SwapTotal: %ld kB\n", &total);
 573
 574         if ((match = strstr(buf, "SwapFree")) == NULL)
 575                 return UNKNOWN_STR;
 576         sscanf(match, "SwapFree: %ld kB\n", &free);
 577
 578         return bprintf("%f", (float)free / 1024 / 1024);
 579 }
 580
 581 static const char *
 582 swap_perc(void)
 583 {
 584         long total, free, cached;
 585         FILE *fp;
 586         size_t bytes_read;
 587         char *match;
 588
 589         fp = fopen("/proc/meminfo", "r");
 590         if (fp == NULL) {
 591                 warn("Failed to open file /proc/meminfo");
 592                 return UNKNOWN_STR;
 593         }
 594
 595         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 596                 warn("swap_perc: read error");
 597                 fclose(fp);
 598                 return UNKNOWN_STR;
 599         }
 600         fclose(fp);
 601
 602         if ((match = strstr(buf, "SwapTotal")) == NULL)
 603                 return UNKNOWN_STR;
 604         sscanf(match, "SwapTotal: %ld kB\n", &total);
 605
 606         if ((match = strstr(buf, "SwapCached")) == NULL)
 607                 return UNKNOWN_STR;
 608         sscanf(match, "SwapCached: %ld kB\n", &cached);
 609
 610         if ((match = strstr(buf, "SwapFree")) == NULL)
 611                 return UNKNOWN_STR;
 612         sscanf(match, "SwapFree: %ld kB\n", &free);
 613
 614         return bprintf("%d", 100 * (total - free - cached) / total);
 615 }
 616
 617 static const char *
 618 swap_total(void)
 619 {
 620         long total;
 621         FILE *fp;
 622         size_t bytes_read;
 623         char *match;
 624
 625         fp = fopen("/proc/meminfo", "r");
 626         if (fp == NULL) {
 627                 warn("Failed to open file /proc/meminfo");
 628                 return UNKNOWN_STR;
 629         }
 630         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 631                 warn("swap_total: read error");
 632                 fclose(fp);
 633                 return UNKNOWN_STR;
 634         }
 635         fclose(fp);
 636
 637         if ((match = strstr(buf, "SwapTotal")) == NULL)
 638                 return UNKNOWN_STR;
 639         sscanf(match, "SwapTotal: %ld kB\n", &total);
 640
 641         return bprintf("%f", (float)total / 1024 / 1024);
 642 }
 643
 644 static const char *
 645 swap_used(void)
 646 {
 647         long total, free, cached;
 648         FILE *fp;
 649         size_t bytes_read;
 650         char *match;
 651
 652         fp = fopen("/proc/meminfo", "r");
 653         if (fp == NULL) {
 654                 warn("Failed to open file /proc/meminfo");
 655                 return UNKNOWN_STR;
 656         }
 657         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 658                 warn("swap_used: read error");
 659                 fclose(fp);
 660                 return UNKNOWN_STR;
 661         }
 662         fclose(fp);
 663
 664         if ((match = strstr(buf, "SwapTotal")) == NULL)
 665                 return UNKNOWN_STR;
 666         sscanf(match, "SwapTotal: %ld kB\n", &total);
 667
 668         if ((match = strstr(buf, "SwapCached")) == NULL)
 669                 return UNKNOWN_STR;
 670         sscanf(match, "SwapCached: %ld kB\n", &cached);
 671
 672         if ((match = strstr(buf, "SwapFree")) == NULL)
 673                 return UNKNOWN_STR;
 674         sscanf(match, "SwapFree: %ld kB\n", &free);
 675
 676         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 677 }
 678
 679 static const char *
 680 temp(const char *file)
 681 {
 682         int n, temp;
 683         FILE *fp;
 684
 685         fp = fopen(file, "r");
 686         if (fp == NULL) {
 687                 warn("Failed to open file %s", file);
 688                 return UNKNOWN_STR;
 689         }
 690         n = fscanf(fp, "%d", &temp);
 691         fclose(fp);
 692         if (n != 1)
 693                 return UNKNOWN_STR;
 694
 695         return bprintf("%d", temp / 1000);
 696 }
 697
 698 static const char *
 699 uptime(void)
 700 {
 701         struct sysinfo info;
 702         int h = 0;
 703         int m = 0;
 704
 705         sysinfo(&info);
 706         h = info.uptime / 3600;
 707         m = (info.uptime - h * 3600 ) / 60;
 708
 709         return bprintf("%dh %dm", h, m);
 710 }
 711
 712 static const char *
 713 username(void)
 714 {
 715         struct passwd *pw = getpwuid(geteuid());
 716
 717         if (pw == NULL) {
 718                 warn("Failed to get username");
 719                 return UNKNOWN_STR;
 720         }
 721
 722         return bprintf("%s", pw->pw_name);
 723 }
 724
 725 static const char *
 726 uid(void)
 727 {
 728         return bprintf("%d", geteuid());
 729 }
 730
 731
 732 static const char *
 733 vol_perc(const char *card)
 734 {
 735         unsigned int i;
 736         int v, afd, devmask;
 737         char *vnames[] = SOUND_DEVICE_NAMES;
 738
 739         afd = open(card, O_RDONLY | O_NONBLOCK);
 740         if (afd == -1) {
 741                 warn("Cannot open %s", card);
 742                 return UNKNOWN_STR;
 743         }
 744
 745         if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
 746                 warn("Cannot get volume for %s", card);
 747                 close(afd);
 748                 return UNKNOWN_STR;
 749         }
 750         for (i = 0; i < LEN(vnames); i++) {
 751                 if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
 752                         if (ioctl(afd, MIXER_READ(i), &v) == -1) {
 753                                 warn("vol_perc: ioctl");
 754                                 close(afd);
 755                                 return UNKNOWN_STR;
 756                         }
 757                 }
 758         }
 759
 760         close(afd);
 761
 762         return bprintf("%d", v & 0xff);
 763 }
 764
 765 static const char *
 766 wifi_perc(const char *iface)
 767 {
 768         int i, perc;
 769         char *p, *datastart;
 770         char path[PATH_MAX];
 771         char status[5];
 772         FILE *fp;
 773
 774         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
 775         fp = fopen(path, "r");
 776         if (fp == NULL) {
 777                 warn("Failed to open file %s", path);
 778                 return UNKNOWN_STR;
 779         }
 780         p = fgets(status, 5, fp);
 781         fclose(fp);
 782         if(!p || strcmp(status, "up\n") != 0) {
 783                 return UNKNOWN_STR;
 784         }
 785
 786         fp = fopen("/proc/net/wireless", "r");
 787         if (fp == NULL) {
 788                 warn("Failed to open file /proc/net/wireless");
 789                 return UNKNOWN_STR;
 790         }
 791
 792         for (i = 0; i < 3; i++) {
 793                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 794                         break;
 795         }
 796         fclose(fp);
 797         if (i < 2 || !p)
 798                 return UNKNOWN_STR;
 799
 800         if ((datastart = strstr(buf, iface)) == NULL)
 801                 return UNKNOWN_STR;
 802
 803         datastart = (datastart+(strlen(iface)+1));
 804         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 805
 806         return bprintf("%d", perc);
 807 }
 808
 809 static const char *
 810 wifi_essid(const char *iface)
 811 {
 812         static char id[IW_ESSID_MAX_SIZE+1];
 813         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 814         struct iwreq wreq;
 815
 816         memset(&wreq, 0, sizeof(struct iwreq));
 817         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 818         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 819
 820         if (sockfd == -1) {
 821                 warn("Failed to get ESSID for interface %s", iface);
 822                 return UNKNOWN_STR;
 823         }
 824         wreq.u.essid.pointer = id;
 825         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 826                 warn("Failed to get ESSID for interface %s", iface);
 827                 return UNKNOWN_STR;
 828         }
 829
 830         close(sockfd);
 831
 832         if (strcmp(id, "") == 0)
 833                 return UNKNOWN_STR;
 834         else
 835                 return id;
 836 }
 837
 838 static void
 839 sighandler(const int signo)
 840 {
 841         if (signo == SIGTERM || signo == SIGINT) {
 842                 done = 1;
 843         }
 844 }
 845
 846 static void
 847 usage(void)
 848 {
 849         fprintf(stderr, "usage: %s [-s]\n", argv0);
 850         exit(1);
 851 }
 852
 853 int
 854 main(int argc, char *argv[])
 855 {
 856         struct arg argument;
 857         struct sigaction act;
 858         size_t i, len;
 859         int sflag = 0;
 860         char status_string[MAXLEN];
 861         char *element;
 862
 863         ARGBEGIN {
 864                 case 's':
 865                         sflag = 1;
 866                         break;
 867                 default:
 868                         usage();
 869         } ARGEND
 870
 871         if (argc) {
 872                 usage();
 873         }
 874
 875         memset(&act, 0, sizeof(act));
 876         act.sa_handler = sighandler;
 877         sigaction(SIGINT,  &act, 0);
 878         sigaction(SIGTERM, &act, 0);
 879
 880         if (!sflag) {
 881                 dpy = XOpenDisplay(NULL);
 882         }
 883
 884         setlocale(LC_ALL, "");
 885
 886         while (!done) {
 887                 status_string[0] = '\0';
 888
 889                 for (element = status_string, i = len = 0; i < LEN(args);
 890                      ++i, element += len) {
 891                         argument = args[i];
 892                         len = snprintf(element, sizeof(status_string)-1 - len,
 893                                        argument.fmt,
 894                                        argument.func(argument.args));
 895                         if (len >= sizeof(status_string)) {
 896                                 status_string[sizeof(status_string)-1] = '\0';
 897                                 break;
 898                         }
 899                 }
 900
 901                 if (sflag) {
 902                         printf("%s\n", status_string);
 903                 } else {
 904                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 905                         XSync(dpy, False);
 906                 }
 907
 908                 if ((UPDATE_INTERVAL - delay) <= 0) {
 909                         delay = 0;
 910                         continue;
 911                 } else {
 912                         sleep(UPDATE_INTERVAL - delay);
 913                         delay = 0;
 914                 }
 915         }
 916
 917         if (!sflag) {
 918                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 919                 XCloseDisplay(dpy);
 920         }
 921
 922         return 0;
 923 }