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         }
 447
 448         buf[bytes_read] = '\0';
 449         fclose(fp);
 450
 451         if (bytes_read == 0 || bytes_read == sizeof(buf)) {
 452                 warn("Failed to read from /proc/meminfo");
 453                 return smprintf(UNKNOWN_STR);
 454         }
 455
 456         match = strstr(buf, "SwapTotal");
 457         sscanf(match, "SwapTotal: %ld kB\n", &total);
 458         if (total == 0) {
 459                 return smprintf(UNKNOWN_STR);
 460         }
 461
 462         match = strstr(buf, "SwapFree");
 463         sscanf(match, "SwapFree: %ld kB\n", &free);
 464
 465         return smprintf("%f", (float)free / 1024 / 1024);
 466 }
 467
 468 static char *
 469 swap_perc(void)
 470 {
 471         long total, free, cached;
 472         FILE *fp;
 473         char buf[2048];
 474         size_t bytes_read;
 475         char *match;
 476
 477         fp = fopen("/proc/meminfo", "r");
 478         if (fp == NULL) {
 479                 warn("Failed to open file /proc/meminfo");
 480                 return smprintf(UNKNOWN_STR);
 481         }
 482
 483         bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
 484         buf[bytes_read] = '\0';
 485         fclose(fp);
 486
 487         if (bytes_read == 0 || bytes_read == sizeof(buf)) {
 488                 warn("Failed to read from /proc/meminfo");
 489                 return smprintf(UNKNOWN_STR);
 490         }
 491
 492         match = strstr(buf, "SwapTotal");
 493         sscanf(match, "SwapTotal: %ld kB\n", &total);
 494         if (total == 0) {
 495                 return smprintf(UNKNOWN_STR);
 496         }
 497
 498         if ((match = strstr(buf, "SwapCached")) == NULL) {
 499                 return smprintf("%s", UNKNOWN_STR);
 500         }
 501         sscanf(match, "SwapCached: %ld kB\n", &cached);
 502
 503         if ((match = strstr(buf, "SwapFree")) == NULL) {
 504                 return smprintf("%s", UNKNOWN_STR);
 505         }
 506         sscanf(match, "SwapFree: %ld kB\n", &free);
 507
 508
 509         return smprintf("%d%%", 100 * (total - free - cached) / total);
 510 }
 511
 512 static char *
 513 swap_total(void)
 514 {
 515         long total;
 516         FILE *fp;
 517         char buf[2048];
 518         size_t bytes_read;
 519         char *match;
 520
 521         fp = fopen("/proc/meminfo", "r");
 522         if (fp == NULL) {
 523                 warn("Failed to open file /proc/meminfo");
 524                 return smprintf(UNKNOWN_STR);
 525         }
 526         bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
 527         buf[bytes_read] = '\0';
 528         fclose(fp);
 529         if (bytes_read == 0 || bytes_read == sizeof(buf)) {
 530                 warn("Failed to read from /proc/meminfo");
 531                 return smprintf(UNKNOWN_STR);
 532         }
 533
 534         match = strstr(buf, "SwapTotal");
 535         sscanf(match, "SwapTotal: %ld kB\n", &total);
 536         if (total == 0) {
 537                 return smprintf(UNKNOWN_STR);
 538         }
 539
 540         return smprintf("%f", (float)total / 1024 / 1024);
 541 }
 542
 543 static char *
 544 swap_used(void)
 545 {
 546         long total, free, cached;
 547         FILE *fp;
 548         char buf[2048];
 549         size_t bytes_read;
 550         char *match;
 551
 552         fp = fopen("/proc/meminfo", "r");
 553         if (fp == NULL) {
 554                 warn("Failed to open file /proc/meminfo");
 555                 return smprintf(UNKNOWN_STR);
 556         }
 557         bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
 558         buf[bytes_read] = '\0';
 559         fclose(fp);
 560         if (bytes_read == 0 || bytes_read == sizeof(buf)) {
 561                 warn("Failed to read from /proc/meminfo");
 562                 return smprintf(UNKNOWN_STR);
 563         }
 564
 565         match = strstr(buf, "SwapTotal");
 566         sscanf(match, "SwapTotal: %ld kB\n", &total);
 567         if (total == 0) {
 568                 return smprintf(UNKNOWN_STR);
 569         }
 570
 571         match = strstr(buf, "SwapCached");
 572         sscanf(match, "SwapCached: %ld kB\n", &cached);
 573
 574         match = strstr(buf, "SwapFree");
 575         sscanf(match, "SwapFree: %ld kB\n", &free);
 576
 577         return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
 578 }
 579
 580 static char *
 581 temp(const char *file)
 582 {
 583         int temp;
 584         FILE *fp;
 585
 586         fp = fopen(file, "r");
 587         if (fp == NULL) {
 588                 warn("Failed to open file %s", file);
 589                 return smprintf(UNKNOWN_STR);
 590         }
 591         fscanf(fp, "%d", &temp);
 592         fclose(fp);
 593
 594         return smprintf("%d°C", temp / 1000);
 595 }
 596
 597 static char *
 598 uptime(void)
 599 {
 600         struct sysinfo info;
 601         int h = 0;
 602         int m = 0;
 603
 604         sysinfo(&info);
 605         h = info.uptime / 3600;
 606         m = (info.uptime - h * 3600 ) / 60;
 607
 608         return smprintf("%dh %dm", h, m);
 609 }
 610
 611 static char *
 612 username(void)
 613 {
 614         uid_t uid = geteuid();
 615         struct passwd *pw = getpwuid(uid);
 616
 617         if (pw == NULL) {
 618                 warn("Failed to get username");
 619                 return smprintf(UNKNOWN_STR);
 620         }
 621
 622         return smprintf("%s", pw->pw_name);
 623 }
 624
 625 static char *
 626 uid(void)
 627 {
 628         return smprintf("%d", geteuid());
 629 }
 630
 631
 632 static char *
 633 vol_perc(const char *card)
 634 {
 635         int mute;
 636         long int vol, max, min;
 637         snd_mixer_t *handle;
 638         snd_mixer_elem_t *elem;
 639         snd_mixer_selem_id_t *s_elem;
 640
 641         snd_mixer_open(&handle, 0);
 642         snd_mixer_attach(handle, card);
 643         snd_mixer_selem_register(handle, NULL, NULL);
 644         snd_mixer_load(handle);
 645         snd_mixer_selem_id_malloc(&s_elem);
 646         snd_mixer_selem_id_set_name(s_elem, "Master");
 647         elem = snd_mixer_find_selem(handle, s_elem);
 648
 649         if (elem == NULL) {
 650                 snd_mixer_selem_id_free(s_elem);
 651                 snd_mixer_close(handle);
 652                 warn("Failed to get volume percentage for %s", card);
 653                 return smprintf(UNKNOWN_STR);
 654         }
 655
 656         snd_mixer_handle_events(handle);
 657         snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
 658         snd_mixer_selem_get_playback_volume(elem, 0, &vol);
 659         snd_mixer_selem_get_playback_switch(elem, 0, &mute);
 660
 661         snd_mixer_selem_id_free(s_elem);
 662         snd_mixer_close(handle);
 663
 664         if (!mute)
 665                 return smprintf("mute");
 666         else if (max == 0)
 667                 return smprintf("0%%");
 668         else
 669                 return smprintf("%lu%%", ((uint_fast16_t)(vol * 100) / max));
 670 }
 671
 672 static char *
 673 wifi_perc(const char *iface)
 674 {
 675         int perc;
 676         char buf[255];
 677         char *datastart;
 678         char status[5];
 679         FILE *fp;
 680
 681         ccat(3, "/sys/class/net/", iface, "/operstate");
 682         fp = fopen(concat, "r");
 683         if (fp == NULL) {
 684                 warn("Failed to open file %s", concat);
 685                 return smprintf(UNKNOWN_STR);
 686         }
 687         fgets(status, 5, fp);
 688         fclose(fp);
 689         if(strcmp(status, "up\n") != 0) {
 690                 return smprintf(UNKNOWN_STR);
 691         }
 692
 693         fp = fopen("/proc/net/wireless", "r");
 694         if (fp == NULL) {
 695                 warn("Failed to open file /proc/net/wireless");
 696                 return smprintf(UNKNOWN_STR);
 697         }
 698         ccat(2, iface, ":");
 699         fgets(buf, sizeof(buf), fp);
 700         fgets(buf, sizeof(buf), fp);
 701         fgets(buf, sizeof(buf), fp);
 702         fclose(fp);
 703
 704         datastart = strstr(buf, concat);
 705         if (datastart != NULL) {
 706                 datastart = strstr(buf, ":");
 707                 sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
 708         }
 709
 710         return smprintf("%d%%", perc);
 711 }
 712
 713 static char *
 714 wifi_essid(const char *iface)
 715 {
 716         char id[IW_ESSID_MAX_SIZE+1];
 717         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 718         struct iwreq wreq;
 719
 720         memset(&wreq, 0, sizeof(struct iwreq));
 721         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 722         sprintf(wreq.ifr_name, iface);
 723         if (sockfd == -1) {
 724                 warn("Failed to get ESSID for interface %s", iface);
 725                 return smprintf(UNKNOWN_STR);
 726         }
 727         wreq.u.essid.pointer = id;
 728         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 729                 warn("Failed to get ESSID for interface %s", iface);
 730                 return smprintf(UNKNOWN_STR);
 731         }
 732
 733         close(sockfd);
 734
 735         if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
 736                 return smprintf(UNKNOWN_STR);
 737         else
 738                 return smprintf("%s", (char *)wreq.u.essid.pointer);
 739 }
 740
 741 static char *
 742 kernel_release(void)
 743 {
 744         struct utsname udata;
 745         if (uname(&udata) < 0)
 746                 return smprintf(UNKNOWN_STR);
 747
 748         return smprintf("%s", udata.release);
 749 }
 750
 751 static void
 752 set_status(const char *str)
 753 {
 754         XStoreName(dpy, DefaultRootWindow(dpy), str);
 755         XSync(dpy, False);
 756 }
 757
 758 static void
 759 sighandler(const int signo)
 760 {
 761         if (signo == SIGTERM || signo == SIGINT) {
 762                 done = 1;
 763         }
 764 }
 765
 766 static void
 767 usage(void)
 768 {
 769         fprintf(stderr, "usage: %s [-dhov]\n", argv0);
 770         exit(1);
 771 }
 772
 773 int
 774 main(int argc, char *argv[])
 775 {
 776         unsigned short int i;
 777         char status_string[2048];
 778         char *res, *element;
 779         struct arg argument;
 780         struct sigaction act;
 781
 782         ARGBEGIN {
 783                 case 'd':
 784                         dflag = 1;
 785                         break;
 786                 case 'o':
 787                         oflag = 1;
 788                         break;
 789                 case 'v':
 790                         printf("slstatus %s (C) 2016 slstatus engineers\n", VERSION);
 791                         return 0;
 792                 default:
 793                         usage();
 794         } ARGEND
 795
 796         if (dflag && oflag) {
 797                 usage();
 798         }
 799         if (dflag && daemon(1, 1) < 0) {
 800                 err(1, "daemon");
 801         }
 802
 803         memset(&act, 0, sizeof(act));
 804         act.sa_handler = sighandler;
 805         sigaction(SIGINT,  &act, 0);
 806         sigaction(SIGTERM, &act, 0);
 807
 808         if (!oflag) {
 809                 dpy = XOpenDisplay(NULL);
 810         }
 811
 812         setlocale(LC_ALL, "");
 813
 814         while (!done) {
 815                 status_string[0] = '\0';
 816
 817                 for (i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 818                         argument = args[i];
 819                         if (argument.args == NULL) {
 820                                 res = argument.func();
 821                         } else {
 822                                 res = argument.func(argument.args);
 823                         }
 824                         element = smprintf(argument.fmt, res);
 825                         if (element == NULL) {
 826                                 element = smprintf(UNKNOWN_STR);
 827                                 warnx("Failed to format output");
 828                         }
 829                         if (strlcat(status_string, element, sizeof(status_string)) >= sizeof(status_string))
 830                                 warnx("Output too long");
 831                         free(res);
 832                         free(element);
 833                 }
 834
 835                 if (!oflag) {
 836                         set_status(status_string);
 837                 } else {
 838                         printf("%s\n", status_string);
 839                 }
 840
 841                 /*
 842                  * subtract delay time spend in function
 843                  * calls from the actual global delay time
 844                  */
 845                 if ((UPDATE_INTERVAL - delay) <= 0) {
 846                         delay = 0;
 847                         continue;
 848                 } else {
 849                         sleep(UPDATE_INTERVAL - delay);
 850                         delay = 0;
 851                 }
 852         }
 853
 854         if (!oflag) {
 855                 set_status(NULL);
 856                 XCloseDisplay(dpy);
 857         }
 858
 859         return 0;
 860 }