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         XKeyboardState state;
 384
 385         XGetKeyboardControl(dpy, &state);
 386
 387         switch (state.led_mask) {
 388                 case 1:
 389                         return "c";
 390                 case 2:
 391                         return "n";
 392                 case 3:
 393                         return "cn";
 394                 default:
 395                         return "";
 396         }
 397 }
 398
 399 static const char *
 400 load_avg(void)
 401 {
 402         double avgs[3];
 403
 404         if (getloadavg(avgs, 3) < 0) {
 405                 warnx("Failed to get the load avg");
 406                 return UNKNOWN_STR;
 407         }
 408
 409         return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 410 }
 411
 412 static const char *
 413 num_files(const char *dir)
 414 {
 415         struct dirent *dp;
 416         DIR *fd;
 417         int num = 0;
 418
 419         if ((fd = opendir(dir)) == NULL) {
 420                 warn("Failed to get number of files in directory %s", dir);
 421                 return UNKNOWN_STR;
 422         }
 423
 424         while ((dp = readdir(fd)) != NULL) {
 425                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 426                         continue; /* skip self and parent */
 427                 num++;
 428         }
 429
 430         closedir(fd);
 431
 432         return bprintf("%d", num);
 433 }
 434
 435 static const char *
 436 ram_free(void)
 437 {
 438         long free;
 439         FILE *fp;
 440         int n;
 441
 442         fp = fopen("/proc/meminfo", "r");
 443         if (fp == NULL) {
 444                 warn("Failed to open file /proc/meminfo");
 445                 return UNKNOWN_STR;
 446         }
 447         n = fscanf(fp, "MemFree: %ld kB\n", &free);
 448         fclose(fp);
 449         if (n != 1)
 450                 return UNKNOWN_STR;
 451
 452         return bprintf("%f", (float)free / 1024 / 1024);
 453 }
 454
 455 static const char *
 456 ram_perc(void)
 457 {
 458         long total, free, buffers, cached;
 459         FILE *fp;
 460
 461         fp = fopen("/proc/meminfo", "r");
 462         if (fp == NULL) {
 463                 warn("Failed to open file /proc/meminfo");
 464                 return UNKNOWN_STR;
 465         }
 466         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 467             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 468             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 469                    &buffers, &buffers) != 2 ||
 470             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 471                 goto scanerr;
 472         fclose(fp);
 473
 474         return bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total);
 475
 476 scanerr:
 477         fclose(fp);
 478         return UNKNOWN_STR;
 479 }
 480
 481 static const char *
 482 ram_total(void)
 483 {
 484         long total;
 485         FILE *fp;
 486         int n;
 487
 488         fp = fopen("/proc/meminfo", "r");
 489         if (fp == NULL) {
 490                 warn("Failed to open file /proc/meminfo");
 491                 return UNKNOWN_STR;
 492         }
 493         n = fscanf(fp, "MemTotal: %ld kB\n", &total);
 494         fclose(fp);
 495         if (n != 1)
 496                 return UNKNOWN_STR;
 497
 498         return bprintf("%f", (float)total / 1024 / 1024);
 499 }
 500
 501 static const char *
 502 ram_used(void)
 503 {
 504         long free, total, buffers, cached;
 505         FILE *fp;
 506
 507         fp = fopen("/proc/meminfo", "r");
 508         if (fp == NULL) {
 509                 warn("Failed to open file /proc/meminfo");
 510                 return UNKNOWN_STR;
 511         }
 512         if (fscanf(fp, "MemTotal: %ld kB\n", &total) != 1 ||
 513             fscanf(fp, "MemFree: %ld kB\n", &free) != 1 ||
 514             fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n",
 515                    &buffers, &buffers) != 2 ||
 516             fscanf(fp, "Cached: %ld kB\n", &cached) != 1)
 517                 goto scanerr;
 518         fclose(fp);
 519
 520         return bprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 521
 522 scanerr:
 523         fclose(fp);
 524         return UNKNOWN_STR;
 525 }
 526
 527 static const char *
 528 run_command(const char *cmd)
 529 {
 530         char *p;
 531         FILE *fp;
 532
 533         fp = popen(cmd, "r");
 534         if (fp == NULL) {
 535                 warn("Failed to get command output for %s", cmd);
 536                 return UNKNOWN_STR;
 537         }
 538         p = fgets(buf, sizeof(buf) - 1, fp);
 539         pclose(fp);
 540         if (!p)
 541                 return UNKNOWN_STR;
 542         if ((p = strrchr(buf, '\n')) != NULL)
 543                 p[0] = '\0';
 544
 545         return buf[0] ? buf : UNKNOWN_STR;
 546 }
 547
 548 static const char *
 549 swap_free(void)
 550 {
 551         long total, free;
 552         FILE *fp;
 553         size_t bytes_read;
 554         char *match;
 555
 556         fp = fopen("/proc/meminfo", "r");
 557         if (fp == NULL) {
 558                 warn("Failed to open file /proc/meminfo");
 559                 return UNKNOWN_STR;
 560         }
 561
 562         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 563                 warn("swap_free: read error");
 564                 fclose(fp);
 565                 return UNKNOWN_STR;
 566         }
 567         fclose(fp);
 568
 569         if ((match = strstr(buf, "SwapTotal")) == NULL)
 570                 return UNKNOWN_STR;
 571         sscanf(match, "SwapTotal: %ld kB\n", &total);
 572
 573         if ((match = strstr(buf, "SwapFree")) == NULL)
 574                 return UNKNOWN_STR;
 575         sscanf(match, "SwapFree: %ld kB\n", &free);
 576
 577         return bprintf("%f", (float)free / 1024 / 1024);
 578 }
 579
 580 static const char *
 581 swap_perc(void)
 582 {
 583         long total, free, cached;
 584         FILE *fp;
 585         size_t bytes_read;
 586         char *match;
 587
 588         fp = fopen("/proc/meminfo", "r");
 589         if (fp == NULL) {
 590                 warn("Failed to open file /proc/meminfo");
 591                 return UNKNOWN_STR;
 592         }
 593
 594         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 595                 warn("swap_perc: read error");
 596                 fclose(fp);
 597                 return UNKNOWN_STR;
 598         }
 599         fclose(fp);
 600
 601         if ((match = strstr(buf, "SwapTotal")) == NULL)
 602                 return UNKNOWN_STR;
 603         sscanf(match, "SwapTotal: %ld kB\n", &total);
 604
 605         if ((match = strstr(buf, "SwapCached")) == NULL)
 606                 return UNKNOWN_STR;
 607         sscanf(match, "SwapCached: %ld kB\n", &cached);
 608
 609         if ((match = strstr(buf, "SwapFree")) == NULL)
 610                 return UNKNOWN_STR;
 611         sscanf(match, "SwapFree: %ld kB\n", &free);
 612
 613         return bprintf("%d", 100 * (total - free - cached) / total);
 614 }
 615
 616 static const char *
 617 swap_total(void)
 618 {
 619         long total;
 620         FILE *fp;
 621         size_t bytes_read;
 622         char *match;
 623
 624         fp = fopen("/proc/meminfo", "r");
 625         if (fp == NULL) {
 626                 warn("Failed to open file /proc/meminfo");
 627                 return UNKNOWN_STR;
 628         }
 629         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 630                 warn("swap_total: read error");
 631                 fclose(fp);
 632                 return UNKNOWN_STR;
 633         }
 634         fclose(fp);
 635
 636         if ((match = strstr(buf, "SwapTotal")) == NULL)
 637                 return UNKNOWN_STR;
 638         sscanf(match, "SwapTotal: %ld kB\n", &total);
 639
 640         return bprintf("%f", (float)total / 1024 / 1024);
 641 }
 642
 643 static const char *
 644 swap_used(void)
 645 {
 646         long total, free, cached;
 647         FILE *fp;
 648         size_t bytes_read;
 649         char *match;
 650
 651         fp = fopen("/proc/meminfo", "r");
 652         if (fp == NULL) {
 653                 warn("Failed to open file /proc/meminfo");
 654                 return UNKNOWN_STR;
 655         }
 656         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
 657                 warn("swap_used: read error");
 658                 fclose(fp);
 659                 return UNKNOWN_STR;
 660         }
 661         fclose(fp);
 662
 663         if ((match = strstr(buf, "SwapTotal")) == NULL)
 664                 return UNKNOWN_STR;
 665         sscanf(match, "SwapTotal: %ld kB\n", &total);
 666
 667         if ((match = strstr(buf, "SwapCached")) == NULL)
 668                 return UNKNOWN_STR;
 669         sscanf(match, "SwapCached: %ld kB\n", &cached);
 670
 671         if ((match = strstr(buf, "SwapFree")) == NULL)
 672                 return UNKNOWN_STR;
 673         sscanf(match, "SwapFree: %ld kB\n", &free);
 674
 675         return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 676 }
 677
 678 static const char *
 679 temp(const char *file)
 680 {
 681         int n, temp;
 682         FILE *fp;
 683
 684         fp = fopen(file, "r");
 685         if (fp == NULL) {
 686                 warn("Failed to open file %s", file);
 687                 return UNKNOWN_STR;
 688         }
 689         n = fscanf(fp, "%d", &temp);
 690         fclose(fp);
 691         if (n != 1)
 692                 return UNKNOWN_STR;
 693
 694         return bprintf("%d", temp / 1000);
 695 }
 696
 697 static const char *
 698 uptime(void)
 699 {
 700         struct sysinfo info;
 701         int h = 0;
 702         int m = 0;
 703
 704         sysinfo(&info);
 705         h = info.uptime / 3600;
 706         m = (info.uptime - h * 3600 ) / 60;
 707
 708         return bprintf("%dh %dm", h, m);
 709 }
 710
 711 static const char *
 712 username(void)
 713 {
 714         struct passwd *pw = getpwuid(geteuid());
 715
 716         if (pw == NULL) {
 717                 warn("Failed to get username");
 718                 return UNKNOWN_STR;
 719         }
 720
 721         return bprintf("%s", pw->pw_name);
 722 }
 723
 724 static const char *
 725 uid(void)
 726 {
 727         return bprintf("%d", geteuid());
 728 }
 729
 730
 731 static const char *
 732 vol_perc(const char *card)
 733 {
 734         unsigned int i;
 735         int v, afd, devmask;
 736         char *vnames[] = SOUND_DEVICE_NAMES;
 737
 738         afd = open(card, O_RDONLY | O_NONBLOCK);
 739         if (afd == -1) {
 740                 warn("Cannot open %s", card);
 741                 return UNKNOWN_STR;
 742         }
 743
 744         if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
 745                 warn("Cannot get volume for %s", card);
 746                 close(afd);
 747                 return UNKNOWN_STR;
 748         }
 749         for (i = 0; i < LEN(vnames); i++) {
 750                 if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
 751                         if (ioctl(afd, MIXER_READ(i), &v) == -1) {
 752                                 warn("vol_perc: ioctl");
 753                                 close(afd);
 754                                 return UNKNOWN_STR;
 755                         }
 756                 }
 757         }
 758
 759         close(afd);
 760
 761         return bprintf("%d", v & 0xff);
 762 }
 763
 764 static const char *
 765 wifi_perc(const char *iface)
 766 {
 767         int i, perc;
 768         char *p, *datastart;
 769         char path[PATH_MAX];
 770         char status[5];
 771         FILE *fp;
 772
 773         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
 774         fp = fopen(path, "r");
 775         if (fp == NULL) {
 776                 warn("Failed to open file %s", path);
 777                 return UNKNOWN_STR;
 778         }
 779         p = fgets(status, 5, fp);
 780         fclose(fp);
 781         if(!p || strcmp(status, "up\n") != 0) {
 782                 return UNKNOWN_STR;
 783         }
 784
 785         fp = fopen("/proc/net/wireless", "r");
 786         if (fp == NULL) {
 787                 warn("Failed to open file /proc/net/wireless");
 788                 return UNKNOWN_STR;
 789         }
 790
 791         for (i = 0; i < 3; i++) {
 792                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 793                         break;
 794         }
 795         fclose(fp);
 796         if (i < 2 || !p)
 797                 return UNKNOWN_STR;
 798
 799         if ((datastart = strstr(buf, iface)) == NULL)
 800                 return UNKNOWN_STR;
 801
 802         datastart = (datastart+(strlen(iface)+1));
 803         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 804
 805         return bprintf("%d", perc);
 806 }
 807
 808 static const char *
 809 wifi_essid(const char *iface)
 810 {
 811         static char id[IW_ESSID_MAX_SIZE+1];
 812         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 813         struct iwreq wreq;
 814
 815         memset(&wreq, 0, sizeof(struct iwreq));
 816         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 817         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 818
 819         if (sockfd == -1) {
 820                 warn("Failed to get ESSID for interface %s", iface);
 821                 return UNKNOWN_STR;
 822         }
 823         wreq.u.essid.pointer = id;
 824         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 825                 warn("Failed to get ESSID for interface %s", iface);
 826                 return UNKNOWN_STR;
 827         }
 828
 829         close(sockfd);
 830
 831         if (strcmp(id, "") == 0)
 832                 return UNKNOWN_STR;
 833         else
 834                 return id;
 835 }
 836
 837 static void
 838 sighandler(const int signo)
 839 {
 840         if (signo == SIGTERM || signo == SIGINT) {
 841                 done = 1;
 842         }
 843 }
 844
 845 static void
 846 usage(void)
 847 {
 848         fprintf(stderr, "usage: %s [-s]\n", argv0);
 849         exit(1);
 850 }
 851
 852 int
 853 main(int argc, char *argv[])
 854 {
 855         struct arg argument;
 856         struct sigaction act;
 857         size_t i, len;
 858         int sflag = 0;
 859         char status_string[MAXLEN];
 860         char *element;
 861
 862         ARGBEGIN {
 863                 case 's':
 864                         sflag = 1;
 865                         break;
 866                 default:
 867                         usage();
 868         } ARGEND
 869
 870         if (argc) {
 871                 usage();
 872         }
 873
 874         memset(&act, 0, sizeof(act));
 875         act.sa_handler = sighandler;
 876         sigaction(SIGINT,  &act, 0);
 877         sigaction(SIGTERM, &act, 0);
 878
 879         if (!sflag) {
 880                 dpy = XOpenDisplay(NULL);
 881                 if (!dpy) {
 882                         fprintf(stderr, "slstatus: cannot open display");
 883                         exit(1);
 884                 }
 885         }
 886
 887         setlocale(LC_ALL, "");
 888
 889         while (!done) {
 890                 status_string[0] = '\0';
 891
 892                 for (element = status_string, i = len = 0; i < LEN(args);
 893                      ++i, element += len) {
 894                         argument = args[i];
 895                         len = snprintf(element, sizeof(status_string)-1 - len,
 896                                        argument.fmt,
 897                                        argument.func(argument.args));
 898                         if (len >= sizeof(status_string)) {
 899                                 status_string[sizeof(status_string)-1] = '\0';
 900                                 break;
 901                         }
 902                 }
 903
 904                 if (sflag) {
 905                         printf("%s\n", status_string);
 906                 } else {
 907                         XStoreName(dpy, DefaultRootWindow(dpy), status_string);
 908                         XSync(dpy, False);
 909                 }
 910
 911                 if ((UPDATE_INTERVAL - delay) <= 0) {
 912                         delay = 0;
 913                         continue;
 914                 } else {
 915                         sleep(UPDATE_INTERVAL - delay);
 916                         delay = 0;
 917                 }
 918         }
 919
 920         if (!sflag) {
 921                 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
 922                 XCloseDisplay(dpy);
 923         }
 924
 925         return 0;
 926 }