slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 #include <alsa/asoundlib.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/sysinfo.h>
  22 #include <sys/types.h>
  23 #include <sys/utsname.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <X11/Xlib.h>
  27
  28 #undef strlcat
  29 #undef strlcpy
  30
  31 #include "extern/arg.h"
  32 #include "extern/strlcat.h"
  33 #include "extern/concat.h"
  34
  35 struct arg {
  36         char *(*func)();
  37         const char *fmt;
  38         const char *args;
  39 };
  40
  41 static char *smprintf(const char *fmt, ...);
  42 static char *battery_perc(const char *bat);
  43 static char *battery_state(const char *bat);
  44 static char *cpu_perc(void);
  45 static char *datetime(const char *fmt);
  46 static char *disk_free(const char *mnt);
  47 static char *disk_perc(const char *mnt);
  48 static char *disk_total(const char *mnt);
  49 static char *disk_used(const char *mnt);
  50 static char *entropy(void);
  51 static char *gid(void);
  52 static char *hostname(void);
  53 static char *ip(const char *iface);
  54 static char *load_avg(void);
  55 static char *ram_free(void);
  56 static char *ram_perc(void);
  57 static char *ram_used(void);
  58 static char *ram_total(void);
  59 static char *run_command(const char *cmd);
  60 static char *swap_free(void);
  61 static char *swap_perc(void);
  62 static char *swap_used(void);
  63 static char *swap_total(void);
  64 static char *temp(const char *file);
  65 static char *uid(void);
  66 static char *uptime(void);
  67 static char *username(void);
  68 static char *vol_perc(const char *card);
  69 static char *wifi_perc(const char *iface);
  70 static char *wifi_essid(const char *iface);
  71 static char *kernel_release(void);
  72 static void set_status(const char *str);
  73 static void sighandler(const int signo);
  74 static void usage(void);
  75
  76 char *argv0;
  77 char concat[];
  78 static unsigned short int delay = 0;
  79 static unsigned short int done;
  80 static unsigned short int dflag, oflag;
  81 static Display *dpy;
  82
  83 #include "config.h"
  84
  85 static char *
  86 smprintf(const char *fmt, ...)
  87 {
  88         va_list ap;
  89         char *ret;
  90         int len;
  91
  92         va_start(ap, fmt);
  93         len = vsnprintf(NULL, 0, fmt, ap);
  94         va_end(ap);
  95
  96         ret = malloc(++len);
  97         if (ret == NULL) {
  98                 err(1, "malloc");
  99         }
 100
 101         va_start(ap, fmt);
 102         vsnprintf(ret, len, fmt, ap);
 103         va_end(ap);
 104
 105         return ret;
 106 }
 107
 108 static char *
 109 battery_perc(const char *bat)
 110 {
 111         int perc;
 112         FILE *fp;
 113
 114         ccat(3, "/sys/class/power_supply/", bat, "/capacity");
 115         fp = fopen(concat, "r");
 116         if (fp == NULL) {
 117                 warn("Failed to open file %s", concat);
 118                 return smprintf(UNKNOWN_STR);
 119         }
 120         fscanf(fp, "%i", &perc);
 121         fclose(fp);
 122
 123         return smprintf("%d%%", perc);
 124 }
 125
 126 static char *
 127 battery_state(const char *bat)
 128 {
 129         char state[12];
 130         FILE *fp;
 131
 132         ccat(3, "/sys/class/power_supply/", bat, "/status");
 133         fp = fopen(concat, "r");
 134         if (fp == NULL) {
 135                 warn("Failed to open file %s", concat);
 136                 return smprintf(UNKNOWN_STR);
 137         }
 138         fscanf(fp, "%12s", state);
 139         fclose(fp);
 140
 141         if (strcmp(state, "Charging") == 0) {
 142                 return smprintf("+");
 143         } else if (strcmp(state, "Discharging") == 0) {
 144                 return smprintf("-");
 145         } else if (strcmp(state, "Full") == 0) {
 146                 return smprintf("=");
 147         } else {
 148                 return smprintf("?");
 149         }
 150 }
 151
 152 static char *
 153 cpu_perc(void)
 154 {
 155         int perc;
 156         long double a[4], b[4];
 157         FILE *fp;
 158
 159         fp = fopen("/proc/stat", "r");
 160         if (fp == NULL) {
 161                 warn("Failed to open file /proc/stat");
 162                 return smprintf(UNKNOWN_STR);
 163         }
 164         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 165         fclose(fp);
 166
 167         delay++;
 168         sleep(delay);
 169
 170         fp = fopen("/proc/stat", "r");
 171         if (fp == NULL) {
 172                 warn("Failed to open file /proc/stat");
 173                 return smprintf(UNKNOWN_STR);
 174         }
 175         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 176         fclose(fp);
 177
 178         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]));
 179         return smprintf("%d%%", perc);
 180 }
 181
 182 static char *
 183 datetime(const char *fmt)
 184 {
 185         time_t t;
 186         char str[80];
 187
 188         t = time(NULL);
 189         if (strftime(str, sizeof(str), fmt, localtime(&t)) == 0) {
 190                 return smprintf(UNKNOWN_STR);
 191         }
 192
 193         return smprintf("%s", str);
 194 }
 195
 196 static char *
 197 disk_free(const char *mnt)
 198 {
 199         struct statvfs fs;
 200
 201         if (statvfs(mnt, &fs) < 0) {
 202                 warn("Failed to get filesystem info");
 203                 return smprintf(UNKNOWN_STR);
 204         }
 205
 206         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 207 }
 208
 209 static char *
 210 disk_perc(const char *mnt)
 211 {
 212         int perc;
 213         struct statvfs fs;
 214
 215         if (statvfs(mnt, &fs) < 0) {
 216                 warn("Failed to get filesystem info");
 217                 return smprintf(UNKNOWN_STR);
 218         }
 219
 220         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 221
 222         return smprintf("%d%%", perc);
 223 }
 224
 225 static char *
 226 disk_total(const char *mnt)
 227 {
 228         struct statvfs fs;
 229
 230         if (statvfs(mnt, &fs) < 0) {
 231                 warn("Failed to get filesystem info");
 232                 return smprintf(UNKNOWN_STR);
 233         }
 234
 235         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 236 }
 237
 238 static char *
 239 disk_used(const char *mnt)
 240 {
 241         struct statvfs fs;
 242
 243         if (statvfs(mnt, &fs) < 0) {
 244                 warn("Failed to get filesystem info");
 245                 return smprintf(UNKNOWN_STR);
 246         }
 247
 248         return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 249 }
 250
 251 static char *
 252 entropy(void)
 253 {
 254         int num;
 255         FILE *fp;
 256
 257         fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
 258         if (fp == NULL) {
 259                 warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
 260                 return smprintf(UNKNOWN_STR);
 261         }
 262         fscanf(fp, "%d", &num);
 263         fclose(fp);
 264
 265         return smprintf("%d", num);
 266 }
 267
 268 static char *
 269 gid(void)
 270 {
 271         return smprintf("%d", getgid());
 272 }
 273
 274 static char *
 275 hostname(void)
 276 {
 277         char buf[HOST_NAME_MAX];
 278
 279         if (gethostname(buf, sizeof(buf)) == -1) {
 280                 warn("hostname");
 281                 return smprintf(UNKNOWN_STR);
 282         }
 283
 284         return smprintf("%s", buf);
 285 }
 286
 287 static char *
 288 ip(const char *iface)
 289 {
 290         struct ifaddrs *ifaddr, *ifa;
 291         int s;
 292         char host[NI_MAXHOST];
 293
 294         if (getifaddrs(&ifaddr) == -1) {
 295                 warn("Failed to get IP address for interface %s", iface);
 296                 return smprintf(UNKNOWN_STR);
 297         }
 298
 299         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 300                 if (ifa->ifa_addr == NULL) {
 301                         continue;
 302                 }
 303                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 304                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 305                         if (s != 0) {
 306                                 warnx("Failed to get IP address for interface %s", iface);
 307                                 return smprintf(UNKNOWN_STR);
 308                         }
 309                         return smprintf("%s", host);
 310                 }
 311         }
 312
 313         freeifaddrs(ifaddr);
 314
 315         return smprintf(UNKNOWN_STR);
 316 }
 317
 318 static char *
 319 load_avg(void)
 320 {
 321         double avgs[3];
 322
 323         if (getloadavg(avgs, 3) < 0) {
 324                 warnx("Failed to get the load avg");
 325                 return smprintf(UNKNOWN_STR);
 326         }
 327
 328         return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 329 }
 330
 331 static char *
 332 ram_free(void)
 333 {
 334         long free;
 335         FILE *fp;
 336
 337         fp = fopen("/proc/meminfo", "r");
 338         if (fp == NULL) {
 339                 warn("Failed to open file /proc/meminfo");
 340                 return smprintf(UNKNOWN_STR);
 341         }
 342         fscanf(fp, "MemFree: %ld kB\n", &free);
 343         fclose(fp);
 344
 345         return smprintf("%f", (float)free / 1024 / 1024);
 346 }
 347
 348 static char *
 349 ram_perc(void)
 350 {
 351         long total, free, buffers, cached;
 352         FILE *fp;
 353
 354         fp = fopen("/proc/meminfo", "r");
 355         if (fp == NULL) {
 356                 warn("Failed to open file /proc/meminfo");
 357                 return smprintf(UNKNOWN_STR);
 358         }
 359         fscanf(fp, "MemTotal: %ld kB\n", &total);
 360         fscanf(fp, "MemFree: %ld kB\n", &free);
 361         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 362         fscanf(fp, "Cached: %ld kB\n", &cached);
 363         fclose(fp);
 364
 365         return smprintf("%d%%", 100 * ((total - free) - (buffers + cached)) / total);
 366 }
 367
 368 static char *
 369 ram_total(void)
 370 {
 371         long total;
 372         FILE *fp;
 373
 374         fp = fopen("/proc/meminfo", "r");
 375         if (fp == NULL) {
 376                 warn("Failed to open file /proc/meminfo");
 377                 return smprintf(UNKNOWN_STR);
 378         }
 379         fscanf(fp, "MemTotal: %ld kB\n", &total);
 380         fclose(fp);
 381
 382         return smprintf("%f", (float)total / 1024 / 1024);
 383 }
 384
 385 static char *
 386 ram_used(void)
 387 {
 388         long free, total, buffers, cached;
 389         FILE *fp;
 390
 391         fp = fopen("/proc/meminfo", "r");
 392         if (fp == NULL) {
 393                 warn("Failed to open file /proc/meminfo");
 394                 return smprintf(UNKNOWN_STR);
 395         }
 396         fscanf(fp, "MemTotal: %ld kB\n", &total);
 397         fscanf(fp, "MemFree: %ld kB\n", &free);
 398         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 399         fscanf(fp, "Cached: %ld kB\n", &cached);
 400         fclose(fp);
 401
 402         return smprintf("%f", (float)(total - free - buffers - cached) / 1024 / 1024);
 403 }
 404
 405 static char *
 406 run_command(const char *cmd)
 407 {
 408         char *nlptr;
 409         FILE *fp;
 410         char buf[1024] = UNKNOWN_STR;
 411
 412         fp = popen(cmd, "r");
 413         if (fp == NULL) {
 414                 warn("Failed to get command output for %s", cmd);
 415                 return smprintf(UNKNOWN_STR);
 416         }
 417         fgets(buf, sizeof(buf), fp);
 418         pclose(fp);
 419         buf[strlen(buf)] = '\0';
 420
 421         if ((nlptr = strstr(buf, "\n")) != NULL) {
 422                 nlptr[0] = '\0';
 423         }
 424
 425         return smprintf("%s", buf);
 426 }
 427
 428 static char *
 429 swap_free(void)
 430 {
 431         long total, free;
 432         FILE *fp;
 433         char buf[2048];
 434         size_t bytes_read;
 435         char *match;
 436
 437         fp = fopen("/proc/meminfo", "r");
 438         if (fp == NULL) {
 439                 warn("Failed to open file /proc/meminfo");
 440                 return smprintf(UNKNOWN_STR);
 441         }
 442
 443         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 444                 warn("swap_free: read error");
 445                 fclose(fp);
 446                 return smprintf("%s", UNKNOWN_STR);
 447         }
 448
 449         buf[bytes_read] = '\0';
 450         fclose(fp);
 451
 452         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 453                 return smprintf("%s", UNKNOWN_STR);
 454         }
 455         sscanf(match, "SwapTotal: %ld kB\n", &total);
 456
 457         if ((match = strstr(buf, "SwapFree")) == NULL) {
 458                 return smprintf("%s", UNKNOWN_STR);
 459         }
 460         sscanf(match, "SwapFree: %ld kB\n", &free);
 461
 462         return smprintf("%f", (float)free / 1024 / 1024);
 463 }
 464
 465 static char *
 466 swap_perc(void)
 467 {
 468         long total, free, cached;
 469         FILE *fp;
 470         char buf[2048];
 471         size_t bytes_read;
 472         char *match;
 473
 474         fp = fopen("/proc/meminfo", "r");
 475         if (fp == NULL) {
 476                 warn("Failed to open file /proc/meminfo");
 477                 return smprintf(UNKNOWN_STR);
 478         }
 479
 480         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 481                 warn("swap_perc: read error");
 482                 fclose(fp);
 483                 return smprintf("%s", UNKNOWN_STR);
 484         }
 485
 486         buf[bytes_read] = '\0';
 487         fclose(fp);
 488
 489         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 490                 return smprintf("%s", UNKNOWN_STR);
 491         }
 492         sscanf(match, "SwapTotal: %ld kB\n", &total);
 493
 494         if ((match = strstr(buf, "SwapCached")) == NULL) {
 495                 return smprintf("%s", UNKNOWN_STR);
 496         }
 497         sscanf(match, "SwapCached: %ld kB\n", &cached);
 498
 499         if ((match = strstr(buf, "SwapFree")) == NULL) {
 500                 return smprintf("%s", UNKNOWN_STR);
 501         }
 502         sscanf(match, "SwapFree: %ld kB\n", &free);
 503
 504         return smprintf("%d%%", 100 * (total - free - cached) / total);
 505 }
 506
 507 static char *
 508 swap_total(void)
 509 {
 510         long total;
 511         FILE *fp;
 512         char buf[2048];
 513         size_t bytes_read;
 514         char *match;
 515
 516         fp = fopen("/proc/meminfo", "r");
 517         if (fp == NULL) {
 518                 warn("Failed to open file /proc/meminfo");
 519                 return smprintf(UNKNOWN_STR);
 520         }
 521         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 522                 warn("swap_total: read error");
 523                 fclose(fp);
 524                 return smprintf("%s", UNKNOWN_STR);
 525         }
 526
 527         buf[bytes_read] = '\0';
 528         fclose(fp);
 529
 530         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 531                 return smprintf("%s", UNKNOWN_STR);
 532         }
 533         sscanf(match, "SwapTotal: %ld kB\n", &total);
 534
 535         return smprintf("%f", (float)total / 1024 / 1024);
 536 }
 537
 538 static char *
 539 swap_used(void)
 540 {
 541         long total, free, cached;
 542         FILE *fp;
 543         char buf[2048];
 544         size_t bytes_read;
 545         char *match;
 546
 547         fp = fopen("/proc/meminfo", "r");
 548         if (fp == NULL) {
 549                 warn("Failed to open file /proc/meminfo");
 550                 return smprintf(UNKNOWN_STR);
 551         }
 552         if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
 553                 warn("swap_used: read error");
 554                 fclose(fp);
 555                 return smprintf("%s", UNKNOWN_STR);
 556         }
 557
 558         buf[bytes_read] = '\0';
 559         fclose(fp);
 560
 561         if ((match = strstr(buf, "SwapTotal")) == NULL) {
 562                 return smprintf("%s", UNKNOWN_STR);
 563         }
 564         sscanf(match, "SwapTotal: %ld kB\n", &total);
 565
 566         if ((match = strstr(buf, "SwapCached")) == NULL) {
 567                 return smprintf("%s", UNKNOWN_STR);
 568         }
 569         sscanf(match, "SwapCached: %ld kB\n", &cached);
 570
 571         if ((match = strstr(buf, "SwapFree")) == NULL) {
 572                 return smprintf("%s", UNKNOWN_STR);
 573         }
 574         sscanf(match, "SwapFree: %ld kB\n", &free);
 575
 576         return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 577 }
 578
 579 static char *
 580 temp(const char *file)
 581 {
 582         int temp;
 583         FILE *fp;
 584
 585         fp = fopen(file, "r");
 586         if (fp == NULL) {
 587                 warn("Failed to open file %s", file);
 588                 return smprintf(UNKNOWN_STR);
 589         }
 590         fscanf(fp, "%d", &temp);
 591         fclose(fp);
 592
 593         return smprintf("%d°C", temp / 1000);
 594 }
 595
 596 static char *
 597 uptime(void)
 598 {
 599         struct sysinfo info;
 600         int h = 0;
 601         int m = 0;
 602
 603         sysinfo(&info);
 604         h = info.uptime / 3600;
 605         m = (info.uptime - h * 3600 ) / 60;
 606
 607         return smprintf("%dh %dm", h, m);
 608 }
 609
 610 static char *
 611 username(void)
 612 {
 613         uid_t uid = geteuid();
 614         struct passwd *pw = getpwuid(uid);
 615
 616         if (pw == NULL) {
 617                 warn("Failed to get username");
 618                 return smprintf(UNKNOWN_STR);
 619         }
 620
 621         return smprintf("%s", pw->pw_name);
 622 }
 623
 624 static char *
 625 uid(void)
 626 {
 627         return smprintf("%d", geteuid());
 628 }
 629
 630
 631 static char *
 632 vol_perc(const char *card)
 633 {
 634         int mute;
 635         long int vol, max, min;
 636         snd_mixer_t *handle;
 637         snd_mixer_elem_t *elem;
 638         snd_mixer_selem_id_t *s_elem;
 639
 640         snd_mixer_open(&handle, 0);
 641         snd_mixer_attach(handle, card);
 642         snd_mixer_selem_register(handle, NULL, NULL);
 643         snd_mixer_load(handle);
 644         snd_mixer_selem_id_malloc(&s_elem);
 645         snd_mixer_selem_id_set_name(s_elem, "Master");
 646         elem = snd_mixer_find_selem(handle, s_elem);
 647
 648         if (elem == NULL) {
 649                 snd_mixer_selem_id_free(s_elem);
 650                 snd_mixer_close(handle);
 651                 warn("Failed to get volume percentage for %s", card);
 652                 return smprintf(UNKNOWN_STR);
 653         }
 654
 655         snd_mixer_handle_events(handle);
 656         snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
 657         snd_mixer_selem_get_playback_volume(elem, 0, &vol);
 658         snd_mixer_selem_get_playback_switch(elem, 0, &mute);
 659
 660         snd_mixer_selem_id_free(s_elem);
 661         snd_mixer_close(handle);
 662
 663         if (!mute)
 664                 return smprintf("mute");
 665         else if (max == 0)
 666                 return smprintf("0%%");
 667         else
 668                 return smprintf("%lu%%", ((uint_fast16_t)(vol * 100) / max));
 669 }
 670
 671 static char *
 672 wifi_perc(const char *iface)
 673 {
 674         int perc;
 675         char buf[255];
 676         char *datastart;
 677         char status[5];
 678         FILE *fp;
 679
 680         ccat(3, "/sys/class/net/", iface, "/operstate");
 681         fp = fopen(concat, "r");
 682         if (fp == NULL) {
 683                 warn("Failed to open file %s", concat);
 684                 return smprintf(UNKNOWN_STR);
 685         }
 686         fgets(status, 5, fp);
 687         fclose(fp);
 688         if(strcmp(status, "up\n") != 0) {
 689                 return smprintf(UNKNOWN_STR);
 690         }
 691
 692         fp = fopen("/proc/net/wireless", "r");
 693         if (fp == NULL) {
 694                 warn("Failed to open file /proc/net/wireless");
 695                 return smprintf(UNKNOWN_STR);
 696         }
 697         ccat(2, iface, ":");
 698         fgets(buf, sizeof(buf), fp);
 699         fgets(buf, sizeof(buf), fp);
 700         fgets(buf, sizeof(buf), fp);
 701         fclose(fp);
 702
 703         datastart = strstr(buf, concat);
 704         if (datastart != NULL) {
 705                 datastart = strstr(buf, ":");
 706                 sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 707         }
 708
 709         return smprintf("%d%%", perc);
 710 }
 711
 712 static char *
 713 wifi_essid(const char *iface)
 714 {
 715         char id[IW_ESSID_MAX_SIZE+1];
 716         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 717         struct iwreq wreq;
 718
 719         memset(&wreq, 0, sizeof(struct iwreq));
 720         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 721         sprintf(wreq.ifr_name, iface);
 722         if (sockfd == -1) {
 723                 warn("Failed to get ESSID for interface %s", iface);
 724                 return smprintf(UNKNOWN_STR);
 725         }
 726         wreq.u.essid.pointer = id;
 727         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 728                 warn("Failed to get ESSID for interface %s", iface);
 729                 return smprintf(UNKNOWN_STR);
 730         }
 731
 732         close(sockfd);
 733
 734         if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
 735                 return smprintf(UNKNOWN_STR);
 736         else
 737                 return smprintf("%s", (char *)wreq.u.essid.pointer);
 738 }
 739
 740 static char *
 741 kernel_release(void)
 742 {
 743         struct utsname udata;
 744         if (uname(&udata) < 0)
 745                 return smprintf(UNKNOWN_STR);
 746
 747         return smprintf("%s", udata.release);
 748 }
 749
 750 static void
 751 set_status(const char *str)
 752 {
 753         XStoreName(dpy, DefaultRootWindow(dpy), str);
 754         XSync(dpy, False);
 755 }
 756
 757 static void
 758 sighandler(const int signo)
 759 {
 760         if (signo == SIGTERM || signo == SIGINT) {
 761                 done = 1;
 762         }
 763 }
 764
 765 static void
 766 usage(void)
 767 {
 768         fprintf(stderr, "usage: %s [-dhov]\n", argv0);
 769         exit(1);
 770 }
 771
 772 int
 773 main(int argc, char *argv[])
 774 {
 775         unsigned short int i;
 776         char status_string[2048];
 777         char *res, *element;
 778         struct arg argument;
 779         struct sigaction act;
 780
 781         ARGBEGIN {
 782                 case 'd':
 783                         dflag = 1;
 784                         break;
 785                 case 'o':
 786                         oflag = 1;
 787                         break;
 788                 case 'v':
 789                         printf("slstatus %s (C) 2016 slstatus engineers\n", VERSION);
 790                         return 0;
 791                 default:
 792                         usage();
 793         } ARGEND
 794
 795         if (dflag && oflag) {
 796                 usage();
 797         }
 798         if (dflag && daemon(1, 1) < 0) {
 799                 err(1, "daemon");
 800         }
 801
 802         memset(&act, 0, sizeof(act));
 803         act.sa_handler = sighandler;
 804         sigaction(SIGINT,  &act, 0);
 805         sigaction(SIGTERM, &act, 0);
 806
 807         if (!oflag) {
 808                 dpy = XOpenDisplay(NULL);
 809         }
 810
 811         setlocale(LC_ALL, "");
 812
 813         while (!done) {
 814                 status_string[0] = '\0';
 815
 816                 for (i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 817                         argument = args[i];
 818                         if (argument.args == NULL) {
 819                                 res = argument.func();
 820                         } else {
 821                                 res = argument.func(argument.args);
 822                         }
 823                         element = smprintf(argument.fmt, res);
 824                         if (element == NULL) {
 825                                 element = smprintf(UNKNOWN_STR);
 826                                 warnx("Failed to format output");
 827                         }
 828                         if (strlcat(status_string, element, sizeof(status_string)) >= sizeof(status_string))
 829                                 warnx("Output too long");
 830                         free(res);
 831                         free(element);
 832                 }
 833
 834                 if (!oflag) {
 835                         set_status(status_string);
 836                 } else {
 837                         printf("%s\n", status_string);
 838                 }
 839
 840                 /*
 841                  * subtract delay time spend in function
 842                  * calls from the actual global delay time
 843                  */
 844                 if ((UPDATE_INTERVAL - delay) <= 0) {
 845                         delay = 0;
 846                         continue;
 847                 } else {
 848                         sleep(UPDATE_INTERVAL - delay);
 849                         delay = 0;
 850                 }
 851         }
 852
 853         if (!oflag) {
 854                 set_status(NULL);
 855                 XCloseDisplay(dpy);
 856         }
 857
 858         return 0;
 859 }