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