procps/ps.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini ps implementation(s) for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
   7  *                         (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
   8  *
   9  * Licensed under GPLv2, see file LICENSE in this source tree.
  10  */
  11
  12 //usage:#if ENABLE_DESKTOP
  13 //usage:
  14 //usage:#define ps_trivial_usage
  15 //usage:       "[-o COL1,COL2=HEADER]" IF_FEATURE_SHOW_THREADS(" [-T]")
  16 //usage:#define ps_full_usage "\n\n"
  17 //usage:       "Show list of processes\n"
  18 //usage:     "\n        -o COL1,COL2=HEADER     Select columns for display"
  19 //usage:        IF_FEATURE_SHOW_THREADS(
  20 //usage:     "\n        -T                      Show threads"
  21 //usage:        )
  22 //usage:
  23 //usage:#else /* !ENABLE_DESKTOP */
  24 //usage:
  25 //usage:#if !ENABLE_SELINUX && !ENABLE_FEATURE_PS_WIDE
  26 //usage:#define USAGE_PS "\nThis version of ps accepts no options"
  27 //usage:#else
  28 //usage:#define USAGE_PS ""
  29 //usage:#endif
  30 //usage:
  31 //usage:#define ps_trivial_usage
  32 //usage:       ""
  33 //usage:#define ps_full_usage "\n\n"
  34 //usage:       "Show list of processes\n"
  35 //usage:        USAGE_PS
  36 //usage:        IF_SELINUX(
  37 //usage:     "\n        -Z      Show selinux context"
  38 //usage:        )
  39 //usage:        IF_FEATURE_PS_WIDE(
  40 //usage:     "\n        w       Wide output"
  41 //usage:        )
  42 //usage:        IF_FEATURE_PS_LONG(
  43 //usage:     "\n        l       Long output"
  44 //usage:        )
  45 //usage:        IF_FEATURE_SHOW_THREADS(
  46 //usage:     "\n        T       Show threads"
  47 //usage:        )
  48 //usage:
  49 //usage:#endif /* ENABLE_DESKTOP */
  50 //usage:
  51 //usage:#define ps_example_usage
  52 //usage:       "$ ps\n"
  53 //usage:       "  PID  Uid      Gid State Command\n"
  54 //usage:       "    1 root     root     S init\n"
  55 //usage:       "    2 root     root     S [kflushd]\n"
  56 //usage:       "    3 root     root     S [kupdate]\n"
  57 //usage:       "    4 root     root     S [kpiod]\n"
  58 //usage:       "    5 root     root     S [kswapd]\n"
  59 //usage:       "  742 andersen andersen S [bash]\n"
  60 //usage:       "  743 andersen andersen S -bash\n"
  61 //usage:       "  745 root     root     S [getty]\n"
  62 //usage:       " 2990 andersen andersen R ps\n"
  63
  64 #include "libbb.h"
  65 #include "common_bufsiz.h"
  66 #ifdef __linux__
  67 # include <sys/sysinfo.h>
  68 #endif
  69
  70 /* Absolute maximum on output line length */
  71 enum { MAX_WIDTH = 2*1024 };
  72
  73 #if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
  74 static unsigned long get_uptime(void)
  75 {
  76 #ifdef __linux__
  77         struct sysinfo info;
  78         if (sysinfo(&info) < 0)
  79                 return 0;
  80         return info.uptime;
  81 #elif 1
  82         unsigned long uptime;
  83         char buf[sizeof(uptime)*3 + 2];
  84         /* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
  85          * (where IDLE is cumulative over all CPUs)
  86          */
  87         if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
  88                 bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
  89         buf[sizeof(buf)-1] = '\0';
  90         sscanf(buf, "%lu", &uptime);
  91         return uptime;
  92 #else
  93         struct timespec ts;
  94         if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
  95                 return 0;
  96         return ts.tv_sec;
  97 #endif
  98 }
  99 #endif
 100
 101 #if ENABLE_DESKTOP
 102
 103 #include <sys/times.h> /* for times() */
 104 #ifndef AT_CLKTCK
 105 # define AT_CLKTCK 17
 106 #endif
 107
 108 /* TODO:
 109  * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
 110  * specifies (for XSI-conformant systems) following default columns
 111  * (l and f mark columns shown with -l and -f respectively):
 112  * F     l   Flags (octal and additive) associated with the process (??)
 113  * S     l   The state of the process
 114  * UID   f,l The user ID; the login name is printed with -f
 115  * PID       The process ID
 116  * PPID  f,l The parent process
 117  * C     f,l Processor utilization
 118  * PRI   l   The priority of the process; higher numbers mean lower priority
 119  * NI    l   Nice value
 120  * ADDR  l   The address of the process
 121  * SZ    l   The size in blocks of the core image of the process
 122  * WCHAN l   The event for which the process is waiting or sleeping
 123  * STIME f   Starting time of the process
 124  * TTY       The controlling terminal for the process
 125  * TIME      The cumulative execution time for the process
 126  * CMD       The command name; the full command line is shown with -f
 127  */
 128 typedef struct {
 129         uint16_t width;
 130         char name6[6];
 131         const char *header;
 132         void (*f)(char *buf, int size, const procps_status_t *ps);
 133         int ps_flags;
 134 } ps_out_t;
 135
 136 struct globals {
 137         ps_out_t* out;
 138         int out_cnt;
 139         int print_header;
 140         int need_flags;
 141         char *buffer;
 142         unsigned terminal_width;
 143 #if ENABLE_FEATURE_PS_TIME
 144         unsigned kernel_HZ;
 145         unsigned long seconds_since_boot;
 146 #endif
 147 } FIX_ALIASING;
 148 #define G (*(struct globals*)bb_common_bufsiz1)
 149 #define out                (G.out               )
 150 #define out_cnt            (G.out_cnt           )
 151 #define print_header       (G.print_header      )
 152 #define need_flags         (G.need_flags        )
 153 #define buffer             (G.buffer            )
 154 #define terminal_width     (G.terminal_width    )
 155 #define kernel_HZ          (G.kernel_HZ         )
 156 #define INIT_G() do { setup_common_bufsiz(); } while (0)
 157
 158 #if ENABLE_FEATURE_PS_TIME
 159 /* for ELF executables, notes are pushed before environment and args */
 160 static uintptr_t find_elf_note(uintptr_t findme)
 161 {
 162         uintptr_t *ep = (uintptr_t *) environ;
 163
 164         while (*ep++)
 165                 continue;
 166         while (*ep) {
 167                 if (ep[0] == findme) {
 168                         return ep[1];
 169                 }
 170                 ep += 2;
 171         }
 172         return -1;
 173 }
 174
 175 #if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
 176 static unsigned get_HZ_by_waiting(void)
 177 {
 178         struct timeval tv1, tv2;
 179         unsigned t1, t2, r, hz;
 180         unsigned cnt = cnt; /* for compiler */
 181         int diff;
 182
 183         r = 0;
 184
 185         /* Wait for times() to reach new tick */
 186         t1 = times(NULL);
 187         do {
 188                 t2 = times(NULL);
 189         } while (t2 == t1);
 190         gettimeofday(&tv2, NULL);
 191
 192         do {
 193                 t1 = t2;
 194                 tv1.tv_usec = tv2.tv_usec;
 195
 196                 /* Wait exactly one times() tick */
 197                 do {
 198                         t2 = times(NULL);
 199                 } while (t2 == t1);
 200                 gettimeofday(&tv2, NULL);
 201
 202                 /* Calculate ticks per sec, rounding up to even */
 203                 diff = tv2.tv_usec - tv1.tv_usec;
 204                 if (diff <= 0) diff += 1000000;
 205                 hz = 1000000u / (unsigned)diff;
 206                 hz = (hz+1) & ~1;
 207
 208                 /* Count how many same hz values we saw */
 209                 if (r != hz) {
 210                         r = hz;
 211                         cnt = 0;
 212                 }
 213                 cnt++;
 214         } while (cnt < 3); /* exit if saw 3 same values */
 215
 216         return r;
 217 }
 218 #else
 219 static inline unsigned get_HZ_by_waiting(void)
 220 {
 221         /* Better method? */
 222         return 100;
 223 }
 224 #endif
 225
 226 static unsigned get_kernel_HZ(void)
 227 {
 228         if (kernel_HZ)
 229                 return kernel_HZ;
 230
 231         /* Works for ELF only, Linux 2.4.0+ */
 232         kernel_HZ = find_elf_note(AT_CLKTCK);
 233         if (kernel_HZ == (unsigned)-1)
 234                 kernel_HZ = get_HZ_by_waiting();
 235
 236         G.seconds_since_boot = get_uptime();
 237
 238         return kernel_HZ;
 239 }
 240 #endif
 241
 242 /* Print value to buf, max size+1 chars (including trailing '\0') */
 243
 244 static void func_user(char *buf, int size, const procps_status_t *ps)
 245 {
 246 #if 1
 247         safe_strncpy(buf, get_cached_username(ps->uid), size+1);
 248 #else
 249         /* "compatible" version, but it's larger */
 250         /* procps 2.18 shows numeric UID if name overflows the field */
 251         /* TODO: get_cached_username() returns numeric string if
 252          * user has no passwd record, we will display it
 253          * left-justified here; too long usernames are shown
 254          * as _right-justified_ IDs. Is it worth fixing? */
 255         const char *user = get_cached_username(ps->uid);
 256         if (strlen(user) <= size)
 257                 safe_strncpy(buf, user, size+1);
 258         else
 259                 sprintf(buf, "%*u", size, (unsigned)ps->uid);
 260 #endif
 261 }
 262
 263 static void func_group(char *buf, int size, const procps_status_t *ps)
 264 {
 265         safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
 266 }
 267
 268 static void func_comm(char *buf, int size, const procps_status_t *ps)
 269 {
 270         safe_strncpy(buf, ps->comm, size+1);
 271 }
 272
 273 static void func_state(char *buf, int size, const procps_status_t *ps)
 274 {
 275         safe_strncpy(buf, ps->state, size+1);
 276 }
 277
 278 static void func_args(char *buf, int size, const procps_status_t *ps)
 279 {
 280         read_cmdline(buf, size+1, ps->pid, ps->comm);
 281 }
 282
 283 static void func_pid(char *buf, int size, const procps_status_t *ps)
 284 {
 285         sprintf(buf, "%*u", size, ps->pid);
 286 }
 287
 288 static void func_ppid(char *buf, int size, const procps_status_t *ps)
 289 {
 290         sprintf(buf, "%*u", size, ps->ppid);
 291 }
 292
 293 static void func_pgid(char *buf, int size, const procps_status_t *ps)
 294 {
 295         sprintf(buf, "%*u", size, ps->pgid);
 296 }
 297
 298 static void put_lu(char *buf, int size, unsigned long u)
 299 {
 300         char buf4[5];
 301
 302         /* see http://en.wikipedia.org/wiki/Tera */
 303         smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
 304         sprintf(buf, "%.*s", size, buf4);
 305 }
 306
 307 static void func_vsz(char *buf, int size, const procps_status_t *ps)
 308 {
 309         put_lu(buf, size, ps->vsz);
 310 }
 311
 312 static void func_rss(char *buf, int size, const procps_status_t *ps)
 313 {
 314         put_lu(buf, size, ps->rss);
 315 }
 316
 317 static void func_tty(char *buf, int size, const procps_status_t *ps)
 318 {
 319         buf[0] = '?';
 320         buf[1] = '\0';
 321         if (ps->tty_major) /* tty field of "0" means "no tty" */
 322                 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
 323 }
 324
 325 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
 326
 327 static void func_rgroup(char *buf, int size, const procps_status_t *ps)
 328 {
 329         safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
 330 }
 331
 332 static void func_ruser(char *buf, int size, const procps_status_t *ps)
 333 {
 334         safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
 335 }
 336
 337 static void func_nice(char *buf, int size, const procps_status_t *ps)
 338 {
 339         sprintf(buf, "%*d", size, ps->niceness);
 340 }
 341
 342 #endif
 343
 344 #if ENABLE_FEATURE_PS_TIME
 345
 346 static void func_etime(char *buf, int size, const procps_status_t *ps)
 347 {
 348         /* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
 349         unsigned long mm;
 350         unsigned ss;
 351
 352         mm = ps->start_time / get_kernel_HZ();
 353         /* must be after get_kernel_HZ()! */
 354         mm = G.seconds_since_boot - mm;
 355         ss = mm % 60;
 356         mm /= 60;
 357         snprintf(buf, size+1, "%3lu:%02u", mm, ss);
 358 }
 359
 360 static void func_time(char *buf, int size, const procps_status_t *ps)
 361 {
 362         /* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
 363         unsigned long mm;
 364         unsigned ss;
 365
 366         mm = (ps->utime + ps->stime) / get_kernel_HZ();
 367         ss = mm % 60;
 368         mm /= 60;
 369         snprintf(buf, size+1, "%3lu:%02u", mm, ss);
 370 }
 371
 372 #endif
 373
 374 #if ENABLE_SELINUX
 375 static void func_label(char *buf, int size, const procps_status_t *ps)
 376 {
 377         safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
 378 }
 379 #endif
 380
 381 /*
 382 static void func_nice(char *buf, int size, const procps_status_t *ps)
 383 {
 384         ps->???
 385 }
 386
 387 static void func_pcpu(char *buf, int size, const procps_status_t *ps)
 388 {
 389 }
 390 */
 391
 392 static const ps_out_t out_spec[] = {
 393 /* Mandated by http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html: */
 394         { 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
 395         { 8                  , "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
 396         { 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
 397         { MAX_WIDTH          , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
 398         { 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
 399         { 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
 400         { 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
 401 #if ENABLE_FEATURE_PS_TIME
 402         { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
 403 #endif
 404 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
 405         { 5                  , "nice"  ,"NI"     ,func_nice  ,PSSCAN_NICE    },
 406         { 8                  , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
 407         { 8                  , "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_RUIDGID },
 408 //      { 5                  , "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
 409 #endif
 410 #if ENABLE_FEATURE_PS_TIME
 411         { 6                  , "time"  ,"TIME"   ,func_time  ,PSSCAN_STIME | PSSCAN_UTIME },
 412 #endif
 413         { 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
 414         { 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
 415 /* Not mandated, but useful: */
 416         { 4                  , "stat"  ,"STAT"   ,func_state ,PSSCAN_STATE   },
 417         { 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
 418 #if ENABLE_SELINUX
 419         { 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
 420 #endif
 421 };
 422
 423 static ps_out_t* new_out_t(void)
 424 {
 425         out = xrealloc_vector(out, 2, out_cnt);
 426         return &out[out_cnt++];
 427 }
 428
 429 static const ps_out_t* find_out_spec(const char *name)
 430 {
 431         unsigned i;
 432         char buf[ARRAY_SIZE(out_spec)*7 + 1];
 433         char *p = buf;
 434
 435         for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
 436                 if (strncmp(name, out_spec[i].name6, 6) == 0)
 437                         return &out_spec[i];
 438                 p += sprintf(p, "%.6s,", out_spec[i].name6);
 439         }
 440         p[-1] = '\0';
 441         bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
 442 }
 443
 444 static void parse_o(char* opt)
 445 {
 446         ps_out_t* new;
 447         // POSIX: "-o is blank- or comma-separated list" (FIXME)
 448         char *comma, *equal;
 449         while (1) {
 450                 comma = strchr(opt, ',');
 451                 equal = strchr(opt, '=');
 452                 if (comma && (!equal || equal > comma)) {
 453                         *comma = '\0';
 454                         *new_out_t() = *find_out_spec(opt);
 455                         *comma = ',';
 456                         opt = comma + 1;
 457                         continue;
 458                 }
 459                 break;
 460         }
 461         // opt points to last spec in comma separated list.
 462         // This one can have =HEADER part.
 463         new = new_out_t();
 464         if (equal)
 465                 *equal = '\0';
 466         *new = *find_out_spec(opt);
 467         if (equal) {
 468                 *equal = '=';
 469                 new->header = equal + 1;
 470                 // POSIX: the field widths shall be ... at least as wide as
 471                 // the header text (default or overridden value).
 472                 // If the header text is null, such as -o user=,
 473                 // the field width shall be at least as wide as the
 474                 // default header text
 475                 if (new->header[0]) {
 476                         new->width = strlen(new->header);
 477                         print_header = 1;
 478                 }
 479         } else
 480                 print_header = 1;
 481 }
 482
 483 static void alloc_line_buffer(void)
 484 {
 485         int i;
 486         int width = 0;
 487         for (i = 0; i < out_cnt; i++) {
 488                 need_flags |= out[i].ps_flags;
 489                 if (out[i].header[0]) {
 490                         print_header = 1;
 491                 }
 492                 width += out[i].width + 1; /* "FIELD " */
 493                 if ((int)(width - terminal_width) > 0) {
 494                         /* The rest does not fit on the screen */
 495                         //out[i].width -= (width - terminal_width - 1);
 496                         out_cnt = i + 1;
 497                         break;
 498                 }
 499         }
 500 #if ENABLE_SELINUX
 501         if (!is_selinux_enabled())
 502                 need_flags &= ~PSSCAN_CONTEXT;
 503 #endif
 504         buffer = xmalloc(width + 1); /* for trailing \0 */
 505 }
 506
 507 static void format_header(void)
 508 {
 509         int i;
 510         ps_out_t* op;
 511         char *p;
 512
 513         if (!print_header)
 514                 return;
 515         p = buffer;
 516         i = 0;
 517         if (out_cnt) {
 518                 while (1) {
 519                         op = &out[i];
 520                         if (++i == out_cnt) /* do not pad last field */
 521                                 break;
 522                         p += sprintf(p, "%-*s ", op->width, op->header);
 523                 }
 524                 strcpy(p, op->header);
 525         }
 526         printf("%.*s\n", terminal_width, buffer);
 527 }
 528
 529 static void format_process(const procps_status_t *ps)
 530 {
 531         int i, len;
 532         char *p = buffer;
 533         i = 0;
 534         if (out_cnt) while (1) {
 535                 out[i].f(p, out[i].width, ps);
 536                 // POSIX: Any field need not be meaningful in all
 537                 // implementations. In such a case a hyphen ( '-' )
 538                 // should be output in place of the field value.
 539                 if (!p[0]) {
 540                         p[0] = '-';
 541                         p[1] = '\0';
 542                 }
 543                 len = strlen(p);
 544                 p += len;
 545                 len = out[i].width - len + 1;
 546                 if (++i == out_cnt) /* do not pad last field */
 547                         break;
 548                 p += sprintf(p, "%*s", len, "");
 549         }
 550         printf("%.*s\n", terminal_width, buffer);
 551 }
 552
 553 #if ENABLE_SELINUX
 554 # define SELINUX_O_PREFIX "label,"
 555 # define DEFAULT_O_STR    (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
 556 #else
 557 # define DEFAULT_O_STR    ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
 558 #endif
 559
 560 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 561 int ps_main(int argc UNUSED_PARAM, char **argv)
 562 {
 563         procps_status_t *p;
 564         llist_t* opt_o = NULL;
 565         char default_o[sizeof(DEFAULT_O_STR)];
 566         int opt;
 567         enum {
 568                 OPT_Z = (1 << 0),
 569                 OPT_o = (1 << 1),
 570                 OPT_a = (1 << 2),
 571                 OPT_A = (1 << 3),
 572                 OPT_d = (1 << 4),
 573                 OPT_e = (1 << 5),
 574                 OPT_f = (1 << 6),
 575                 OPT_l = (1 << 7),
 576                 OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
 577         };
 578
 579         INIT_G();
 580
 581         // POSIX:
 582         // -a  Write information for all processes associated with terminals
 583         //     Implementations may omit session leaders from this list
 584         // -A  Write information for all processes
 585         // -d  Write information for all processes, except session leaders
 586         // -e  Write information for all processes (equivalent to -A)
 587         // -f  Generate a full listing
 588         // -l  Generate a long listing
 589         // -o col1,col2,col3=header
 590         //     Select which columns to display
 591         /* We allow (and ignore) most of the above. FIXME.
 592          * -T is picked for threads (POSIX hasn't standardized it).
 593          * procps v3.2.7 supports -T and shows tids as SPID column,
 594          * it also supports -L where it shows tids as LWP column.
 595          */
 596         opt = getopt32(argv, "Zo:*aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
 597         if (opt_o) {
 598                 do {
 599                         parse_o(llist_pop(&opt_o));
 600                 } while (opt_o);
 601         } else {
 602                 /* Below: parse_o() needs char*, NOT const char*,
 603                  * can't pass it constant string. Need to make a copy first.
 604                  */
 605 #if ENABLE_SELINUX
 606                 if (!(opt & OPT_Z) || !is_selinux_enabled()) {
 607                         /* no -Z or no SELinux: do not show LABEL */
 608                         strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
 609                 } else
 610 #endif
 611                 {
 612                         strcpy(default_o, DEFAULT_O_STR);
 613                 }
 614                 parse_o(default_o);
 615         }
 616 #if ENABLE_FEATURE_SHOW_THREADS
 617         if (opt & OPT_T)
 618                 need_flags |= PSSCAN_TASKS;
 619 #endif
 620
 621         /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
 622          * and such large widths */
 623         terminal_width = MAX_WIDTH;
 624         if (isatty(1)) {
 625                 terminal_width = get_terminal_width(0);
 626                 if (--terminal_width > MAX_WIDTH)
 627                         terminal_width = MAX_WIDTH;
 628         }
 629         alloc_line_buffer();
 630         format_header();
 631
 632         p = NULL;
 633         while ((p = procps_scan(p, need_flags)) != NULL) {
 634                 format_process(p);
 635         }
 636
 637         return EXIT_SUCCESS;
 638 }
 639
 640
 641 #else /* !ENABLE_DESKTOP */
 642
 643
 644 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 645 int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 646 {
 647         procps_status_t *p;
 648         int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
 649                         | PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
 650         unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
 651         enum {
 652                 OPT_Z = (1 << 0) * ENABLE_SELINUX,
 653                 OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
 654                 OPT_l = (1 << ENABLE_SELINUX) * (1 << ENABLE_FEATURE_SHOW_THREADS) * ENABLE_FEATURE_PS_LONG,
 655         };
 656 #if ENABLE_FEATURE_PS_LONG
 657         time_t now = now; /* for compiler */
 658         unsigned long uptime = uptime;
 659 #endif
 660         /* If we support any options, parse argv */
 661 #if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG
 662         int opts = 0;
 663 # if ENABLE_FEATURE_PS_WIDE
 664         /* -w is a bit complicated */
 665         int w_count = 0;
 666         opt_complementary = "-:ww";
 667         opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l")
 668                                         "w", &w_count);
 669         /* if w is given once, GNU ps sets the width to 132,
 670          * if w is given more than once, it is "unlimited"
 671          */
 672         if (w_count) {
 673                 terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
 674         } else {
 675                 terminal_width = get_terminal_width(0);
 676                 /* Go one less... */
 677                 if (--terminal_width > MAX_WIDTH)
 678                         terminal_width = MAX_WIDTH;
 679         }
 680 # else
 681         /* -w is not supported, only -Z and/or -T */
 682         opt_complementary = "-";
 683         opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l"));
 684 # endif
 685
 686 # if ENABLE_SELINUX
 687         if ((opts & OPT_Z) && is_selinux_enabled()) {
 688                 psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
 689                                 | PSSCAN_STATE | PSSCAN_COMM;
 690                 puts("  PID CONTEXT                          STAT COMMAND");
 691         } else
 692 # endif
 693         if (opts & OPT_l) {
 694                 psscan_flags = PSSCAN_STATE | PSSCAN_UIDGID | PSSCAN_PID | PSSCAN_PPID
 695                         | PSSCAN_TTY | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_COMM
 696                         | PSSCAN_VSZ | PSSCAN_RSS;
 697 /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
 698  * mandates for -l:
 699  * -F     Flags (?)
 700  * S      State
 701  * UID,PID,PPID
 702  * -C     CPU usage
 703  * -PRI   The priority of the process; higher numbers mean lower priority
 704  * -NI    Nice value
 705  * -ADDR  The address of the process (?)
 706  * SZ     The size in blocks of the core image
 707  * -WCHAN The event for which the process is waiting or sleeping
 708  * TTY
 709  * TIME   The cumulative execution time
 710  * CMD
 711  * We don't show fields marked with '-'.
 712  * We show VSZ and RSS instead of SZ.
 713  * We also show STIME (standard says that -f shows it, -l doesn't).
 714  */
 715                 puts("S   UID   PID  PPID   VSZ   RSS TTY   STIME TIME     CMD");
 716 # if ENABLE_FEATURE_PS_LONG
 717                 now = time(NULL);
 718                 uptime = get_uptime();
 719 # endif
 720         }
 721         else {
 722                 puts("  PID USER       VSZ STAT COMMAND");
 723         }
 724         if (opts & OPT_T) {
 725                 psscan_flags |= PSSCAN_TASKS;
 726         }
 727 #endif
 728
 729         p = NULL;
 730         while ((p = procps_scan(p, psscan_flags)) != NULL) {
 731                 int len;
 732 #if ENABLE_SELINUX
 733                 if (psscan_flags & PSSCAN_CONTEXT) {
 734                         len = printf("%5u %-32.32s %s  ",
 735                                         p->pid,
 736                                         p->context ? p->context : "unknown",
 737                                         p->state);
 738                 } else
 739 #endif
 740                 {
 741                         char buf6[6];
 742                         smart_ulltoa5(p->vsz, buf6, " mgtpezy")[0] = '\0';
 743 #if ENABLE_FEATURE_PS_LONG
 744                         if (opts & OPT_l) {
 745                                 char bufr[6], stime_str[6];
 746                                 char tty[2 * sizeof(int)*3 + 2];
 747                                 char *endp;
 748                                 unsigned sut = (p->stime + p->utime) / 100;
 749                                 unsigned elapsed = uptime - (p->start_time / 100);
 750                                 time_t start = now - elapsed;
 751                                 struct tm *tm = localtime(&start);
 752
 753                                 smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';
 754
 755                                 if (p->tty_major == 136)
 756                                         /* It should be pts/N, not ptsN, but N > 9
 757                                          * will overflow field width...
 758                                          */
 759                                         endp = stpcpy(tty, "pts");
 760                                 else
 761                                 if (p->tty_major == 4) {
 762                                         endp = stpcpy(tty, "tty");
 763                                         if (p->tty_minor >= 64) {
 764                                                 p->tty_minor -= 64;
 765                                                 *endp++ = 'S';
 766                                         }
 767                                 }
 768                                 else
 769                                         endp = tty + sprintf(tty, "%d:", p->tty_major);
 770                                 strcpy(endp, utoa(p->tty_minor));
 771
 772                                 strftime(stime_str, 6, (elapsed >= (24 * 60 * 60)) ? "%b%d" : "%H:%M", tm);
 773                                 stime_str[5] = '\0';
 774                                 //            S  UID PID PPID VSZ RSS TTY STIME TIME        CMD
 775                                 len = printf("%c %5u %5u %5u %5s %5s %-5s %s %02u:%02u:%02u ",
 776                                         p->state[0], p->uid, p->pid, p->ppid, buf6, bufr, tty,
 777                                         stime_str, sut / 3600, (sut % 3600) / 60, sut % 60);
 778                         } else
 779 #endif
 780                         {
 781                                 const char *user = get_cached_username(p->uid);
 782                                 len = printf("%5u %-8.8s %s %s  ",
 783                                         p->pid, user, buf6, p->state);
 784                         }
 785                 }
 786
 787                 {
 788                         int sz = terminal_width - len;
 789                         if (sz >= 0) {
 790                                 char buf[sz + 1];
 791                                 read_cmdline(buf, sz, p->pid, p->comm);
 792                                 puts(buf);
 793                         }
 794                 }
 795         }
 796         if (ENABLE_FEATURE_CLEAN_UP)
 797                 clear_username_cache();
 798         return EXIT_SUCCESS;
 799 }
 800
 801 #endif /* !ENABLE_DESKTOP */