u-tools/apps/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 the GPL version 2, see the file LICENSE in this tarball.
  10  */
  11
  12 #include "libbb.h"
  13
  14 /* Absolute maximum on output line length */
  15 enum { MAX_WIDTH = 2*1024 };
  16
  17 #if ENABLE_DESKTOP
  18
  19 #include <sys/times.h> /* for times() */
  20 //#include <sys/sysinfo.h> /* for sysinfo() */
  21 #ifndef AT_CLKTCK
  22 #define AT_CLKTCK 17
  23 #endif
  24
  25
  26 #if ENABLE_SELINUX
  27 #define SELINUX_O_PREFIX "label,"
  28 #define DEFAULT_O_STR    (SELINUX_O_PREFIX "pid,user" USE_FEATURE_PS_TIME(",time") ",args")
  29 #else
  30 #define DEFAULT_O_STR    ("pid,user" USE_FEATURE_PS_TIME(",time") ",args")
  31 #endif
  32
  33 typedef struct {
  34         uint16_t width;
  35         char name[6];
  36         const char *header;
  37         void (*f)(char *buf, int size, const procps_status_t *ps);
  38         int ps_flags;
  39 } ps_out_t;
  40
  41 struct globals {
  42         ps_out_t* out;
  43         int out_cnt;
  44         int print_header;
  45         int need_flags;
  46         char *buffer;
  47         unsigned terminal_width;
  48 #if ENABLE_FEATURE_PS_TIME
  49         unsigned kernel_HZ;
  50         unsigned long long seconds_since_boot;
  51 #endif
  52         char default_o[sizeof(DEFAULT_O_STR)];
  53 };
  54 #define G (*(struct globals*)&bb_common_bufsiz1)
  55 #define out                (G.out               )
  56 #define out_cnt            (G.out_cnt           )
  57 #define print_header       (G.print_header      )
  58 #define need_flags         (G.need_flags        )
  59 #define buffer             (G.buffer            )
  60 #define terminal_width     (G.terminal_width    )
  61 #define kernel_HZ          (G.kernel_HZ         )
  62 #define seconds_since_boot (G.seconds_since_boot)
  63 #define default_o          (G.default_o         )
  64
  65 #if ENABLE_FEATURE_PS_TIME
  66 /* for ELF executables, notes are pushed before environment and args */
  67 static ptrdiff_t find_elf_note(ptrdiff_t findme)
  68 {
  69         ptrdiff_t *ep = (ptrdiff_t *) environ;
  70
  71         while (*ep++);
  72         while (*ep) {
  73                 if (ep[0] == findme) {
  74                         return ep[1];
  75                 }
  76                 ep += 2;
  77         }
  78         return -1;
  79 }
  80
  81 #if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
  82 static unsigned get_HZ_by_waiting(void)
  83 {
  84         struct timeval tv1, tv2;
  85         unsigned t1, t2, r, hz;
  86         unsigned cnt = cnt; /* for compiler */
  87         int diff;
  88
  89         r = 0;
  90
  91         /* Wait for times() to reach new tick */
  92         t1 = times(NULL);
  93         do {
  94                 t2 = times(NULL);
  95         } while (t2 == t1);
  96         gettimeofday(&tv2, NULL);
  97
  98         do {
  99                 t1 = t2;
 100                 tv1.tv_usec = tv2.tv_usec;
 101
 102                 /* Wait exactly one times() tick */
 103                 do {
 104                         t2 = times(NULL);
 105                 } while (t2 == t1);
 106                 gettimeofday(&tv2, NULL);
 107
 108                 /* Calculate ticks per sec, rounding up to even */
 109                 diff = tv2.tv_usec - tv1.tv_usec;
 110                 if (diff <= 0) diff += 1000000;
 111                 hz = 1000000u / (unsigned)diff;
 112                 hz = (hz+1) & ~1;
 113
 114                 /* Count how many same hz values we saw */
 115                 if (r != hz) {
 116                         r = hz;
 117                         cnt = 0;
 118                 }
 119                 cnt++;
 120         } while (cnt < 3); /* exit if saw 3 same values */
 121
 122         return r;
 123 }
 124 #else
 125 static inline unsigned get_HZ_by_waiting(void)
 126 {
 127         /* Better method? */
 128         return 100;
 129 }
 130 #endif
 131
 132 static unsigned get_kernel_HZ(void)
 133 {
 134         //char buf[64];
 135         struct sysinfo info;
 136
 137         if (kernel_HZ)
 138                 return kernel_HZ;
 139
 140         /* Works for ELF only, Linux 2.4.0+ */
 141         kernel_HZ = find_elf_note(AT_CLKTCK);
 142         if (kernel_HZ == (unsigned)-1)
 143                 kernel_HZ = get_HZ_by_waiting();
 144
 145         //if (open_read_close("/proc/uptime", buf, sizeof(buf) <= 0)
 146         //      bb_perror_msg_and_die("cannot read %s", "/proc/uptime");
 147         //buf[sizeof(buf)-1] = '\0';
 148         ///sscanf(buf, "%llu", &seconds_since_boot);
 149         sysinfo(&info);
 150         seconds_since_boot = info.uptime;
 151
 152         return kernel_HZ;
 153 }
 154 #endif
 155
 156 /* Print value to buf, max size+1 chars (including trailing '\0') */
 157
 158 static void func_user(char *buf, int size, const procps_status_t *ps)
 159 {
 160 #if 1
 161         safe_strncpy(buf, get_cached_username(ps->uid), size+1);
 162 #else
 163         /* "compatible" version, but it's larger */
 164         /* procps 2.18 shows numeric UID if name overflows the field */
 165         /* TODO: get_cached_username() returns numeric string if
 166          * user has no passwd record, we will display it
 167          * left-justified here; too long usernames are shown
 168          * as _right-justified_ IDs. Is it worth fixing? */
 169         const char *user = get_cached_username(ps->uid);
 170         if (strlen(user) <= size)
 171                 safe_strncpy(buf, user, size+1);
 172         else
 173                 sprintf(buf, "%*u", size, (unsigned)ps->uid);
 174 #endif
 175 }
 176
 177 static void func_comm(char *buf, int size, const procps_status_t *ps)
 178 {
 179         safe_strncpy(buf, ps->comm, size+1);
 180 }
 181
 182 static void func_args(char *buf, int size, const procps_status_t *ps)
 183 {
 184         read_cmdline(buf, size, ps->pid, ps->comm);
 185 }
 186
 187 static void func_pid(char *buf, int size, const procps_status_t *ps)
 188 {
 189         sprintf(buf, "%*u", size, ps->pid);
 190 }
 191
 192 static void func_ppid(char *buf, int size, const procps_status_t *ps)
 193 {
 194         sprintf(buf, "%*u", size, ps->ppid);
 195 }
 196
 197 static void func_pgid(char *buf, int size, const procps_status_t *ps)
 198 {
 199         sprintf(buf, "%*u", size, ps->pgid);
 200 }
 201
 202 static void put_lu(char *buf, int size, unsigned long u)
 203 {
 204         char buf4[5];
 205
 206         /* see http://en.wikipedia.org/wiki/Tera */
 207         smart_ulltoa4(u, buf4, " mgtpezy");
 208         buf4[4] = '\0';
 209         sprintf(buf, "%.*s", size, buf4);
 210 }
 211
 212 static void func_vsz(char *buf, int size, const procps_status_t *ps)
 213 {
 214         put_lu(buf, size, ps->vsz);
 215 }
 216
 217 static void func_rss(char *buf, int size, const procps_status_t *ps)
 218 {
 219         put_lu(buf, size, ps->rss);
 220 }
 221
 222 static void func_tty(char *buf, int size, const procps_status_t *ps)
 223 {
 224         buf[0] = '?';
 225         buf[1] = '\0';
 226         if (ps->tty_major) /* tty field of "0" means "no tty" */
 227                 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
 228 }
 229
 230 #if ENABLE_FEATURE_PS_TIME
 231 static void func_etime(char *buf, int size, const procps_status_t *ps)
 232 {
 233         /* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
 234         unsigned long mm;
 235         unsigned ss;
 236
 237         mm = ps->start_time / get_kernel_HZ();
 238         /* must be after get_kernel_HZ()! */
 239         mm = seconds_since_boot - mm;
 240         ss = mm % 60;
 241         mm /= 60;
 242         snprintf(buf, size+1, "%3lu:%02u", mm, ss);
 243 }
 244
 245 static void func_time(char *buf, int size, const procps_status_t *ps)
 246 {
 247         /* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
 248         unsigned long mm;
 249         unsigned ss;
 250
 251         mm = (ps->utime + ps->stime) / get_kernel_HZ();
 252         ss = mm % 60;
 253         mm /= 60;
 254         snprintf(buf, size+1, "%3lu:%02u", mm, ss);
 255 }
 256 #endif
 257
 258 #if ENABLE_SELINUX
 259 static void func_label(char *buf, int size, const procps_status_t *ps)
 260 {
 261         safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
 262 }
 263 #endif
 264
 265 /*
 266 static void func_nice(char *buf, int size, const procps_status_t *ps)
 267 {
 268         ps->???
 269 }
 270
 271 static void func_pcpu(char *buf, int size, const procps_status_t *ps)
 272 {
 273 }
 274 */
 275
 276 static const ps_out_t out_spec[] = {
 277 // Mandated by POSIX:
 278         { 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
 279         { 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
 280         { 256                , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
 281         { 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
 282         { 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
 283         { 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
 284 #if ENABLE_FEATURE_PS_TIME
 285         { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
 286 #endif
 287 //      { sizeof("GROUP"  )-1, "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
 288 //      { sizeof("NI"     )-1, "nice"  ,"NI"     ,func_nice  ,PSSCAN_        },
 289 //      { sizeof("%CPU"   )-1, "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
 290 //      { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID  },
 291 //      { sizeof("RUSER"  )-1, "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_UIDGID  },
 292 #if ENABLE_FEATURE_PS_TIME
 293         { 6                  , "time"  ,"TIME"   ,func_time  ,PSSCAN_STIME | PSSCAN_UTIME },
 294 #endif
 295         { 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
 296         { 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
 297 // Not mandated by POSIX, but useful:
 298         { 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
 299 #if ENABLE_SELINUX
 300         { 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
 301 #endif
 302 };
 303
 304 static ps_out_t* new_out_t(void)
 305 {
 306         out = xrealloc_vector(out, 2, out_cnt);
 307         return &out[out_cnt++];
 308 }
 309
 310 static const ps_out_t* find_out_spec(const char *name)
 311 {
 312         unsigned i;
 313         for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
 314                 if (!strcmp(name, out_spec[i].name))
 315                         return &out_spec[i];
 316         }
 317         bb_error_msg_and_die("bad -o argument '%s'", name);
 318 }
 319
 320 static void parse_o(char* opt)
 321 {
 322         ps_out_t* new;
 323         // POSIX: "-o is blank- or comma-separated list" (FIXME)
 324         char *comma, *equal;
 325         while (1) {
 326                 comma = strchr(opt, ',');
 327                 equal = strchr(opt, '=');
 328                 if (comma && (!equal || equal > comma)) {
 329                         *comma = '\0';
 330                         *new_out_t() = *find_out_spec(opt);
 331                         *comma = ',';
 332                         opt = comma + 1;
 333                         continue;
 334                 }
 335                 break;
 336         }
 337         // opt points to last spec in comma separated list.
 338         // This one can have =HEADER part.
 339         new = new_out_t();
 340         if (equal)
 341                 *equal = '\0';
 342         *new = *find_out_spec(opt);
 343         if (equal) {
 344                 *equal = '=';
 345                 new->header = equal + 1;
 346                 // POSIX: the field widths shall be ... at least as wide as
 347                 // the header text (default or overridden value).
 348                 // If the header text is null, such as -o user=,
 349                 // the field width shall be at least as wide as the
 350                 // default header text
 351                 if (new->header[0]) {
 352                         new->width = strlen(new->header);
 353                         print_header = 1;
 354                 }
 355         } else
 356                 print_header = 1;
 357 }
 358
 359 static void post_process(void)
 360 {
 361         int i;
 362         int width = 0;
 363         for (i = 0; i < out_cnt; i++) {
 364                 need_flags |= out[i].ps_flags;
 365                 if (out[i].header[0]) {
 366                         print_header = 1;
 367                 }
 368                 width += out[i].width + 1; /* "FIELD " */
 369         }
 370 #if ENABLE_SELINUX
 371         if (!is_selinux_enabled())
 372                 need_flags &= ~PSSCAN_CONTEXT;
 373 #endif
 374         buffer = xmalloc(width + 1); /* for trailing \0 */
 375 }
 376
 377 static void format_header(void)
 378 {
 379         int i;
 380         ps_out_t* op;
 381         char *p;
 382
 383         if (!print_header)
 384                 return;
 385         p = buffer;
 386         i = 0;
 387         if (out_cnt) {
 388                 while (1) {
 389                         op = &out[i];
 390                         if (++i == out_cnt) /* do not pad last field */
 391                                 break;
 392                         p += sprintf(p, "%-*s ", op->width, op->header);
 393                 }
 394                 strcpy(p, op->header);
 395         }
 396         printf("%.*s\n", terminal_width, buffer);
 397 }
 398
 399 static void format_process(const procps_status_t *ps)
 400 {
 401         int i, len;
 402         char *p = buffer;
 403         i = 0;
 404         if (out_cnt) while (1) {
 405                 out[i].f(p, out[i].width, ps);
 406                 // POSIX: Any field need not be meaningful in all
 407                 // implementations. In such a case a hyphen ( '-' )
 408                 // should be output in place of the field value.
 409                 if (!p[0]) {
 410                         p[0] = '-';
 411                         p[1] = '\0';
 412                 }
 413                 len = strlen(p);
 414                 p += len;
 415                 len = out[i].width - len + 1;
 416                 if (++i == out_cnt) /* do not pad last field */
 417                         break;
 418                 p += sprintf(p, "%*s", len, "");
 419         }
 420         printf("%.*s\n", terminal_width, buffer);
 421 }
 422
 423 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 424 int ps_main(int argc UNUSED_PARAM, char **argv)
 425 {
 426         procps_status_t *p;
 427         llist_t* opt_o = NULL;
 428         USE_SELINUX(int opt;)
 429
 430         // POSIX:
 431         // -a  Write information for all processes associated with terminals
 432         //     Implementations may omit session leaders from this list
 433         // -A  Write information for all processes
 434         // -d  Write information for all processes, except session leaders
 435         // -e  Write information for all processes (equivalent to -A.)
 436         // -f  Generate a full listing
 437         // -l  Generate a long listing
 438         // -o col1,col2,col3=header
 439         //     Select which columns to display
 440         /* We allow (and ignore) most of the above. FIXME */
 441         opt_complementary = "o::";
 442         USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
 443         if (opt_o) {
 444                 do {
 445                         parse_o(llist_pop(&opt_o));
 446                 } while (opt_o);
 447         } else {
 448                 /* Below: parse_o() needs char*, NOT const char*... */
 449 #if ENABLE_SELINUX
 450                 if (!(opt & 1) || !is_selinux_enabled()) {
 451                         /* no -Z or no SELinux: do not show LABEL */
 452                         strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
 453                 } else
 454 #endif
 455                 {
 456                         strcpy(default_o, DEFAULT_O_STR);
 457                 }
 458                 parse_o(default_o);
 459         }
 460         post_process();
 461
 462         /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
 463          * and such large widths */
 464         terminal_width = MAX_WIDTH;
 465         if (isatty(1)) {
 466                 get_terminal_width_height(0, &terminal_width, NULL);
 467                 if (--terminal_width > MAX_WIDTH)
 468                         terminal_width = MAX_WIDTH;
 469         }
 470         format_header();
 471
 472         p = NULL;
 473         while ((p = procps_scan(p, need_flags))) {
 474                 format_process(p);
 475         }
 476
 477         return EXIT_SUCCESS;
 478 }
 479
 480
 481 #else /* !ENABLE_DESKTOP */
 482
 483
 484 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 485 int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 486 {
 487         procps_status_t *p = NULL;
 488         int len;
 489         SKIP_SELINUX(const) int use_selinux = 0;
 490         USE_SELINUX(int i;)
 491 #if !ENABLE_FEATURE_PS_WIDE
 492         enum { terminal_width = 79 };
 493 #else
 494         unsigned terminal_width;
 495         int w_count = 0;
 496 #endif
 497
 498 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
 499 #if ENABLE_FEATURE_PS_WIDE
 500         opt_complementary = "-:ww";
 501         USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
 502         /* if w is given once, GNU ps sets the width to 132,
 503          * if w is given more than once, it is "unlimited"
 504          */
 505         if (w_count) {
 506                 terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
 507         } else {
 508                 get_terminal_width_height(0, &terminal_width, NULL);
 509                 /* Go one less... */
 510                 if (--terminal_width > MAX_WIDTH)
 511                         terminal_width = MAX_WIDTH;
 512         }
 513 #else /* only ENABLE_SELINUX */
 514         i = getopt32(argv, "Z");
 515 #endif
 516 #if ENABLE_SELINUX
 517         if ((i & 1) && is_selinux_enabled())
 518                 use_selinux = PSSCAN_CONTEXT;
 519 #endif
 520 #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
 521
 522         if (use_selinux)
 523                 puts("  PID CONTEXT                          STAT COMMAND");
 524         else
 525                 puts("  PID USER       VSZ STAT COMMAND");
 526
 527         while ((p = procps_scan(p, 0
 528                         | PSSCAN_PID
 529                         | PSSCAN_UIDGID
 530                         | PSSCAN_STATE
 531                         | PSSCAN_VSZ
 532                         | PSSCAN_COMM
 533                         | use_selinux
 534         ))) {
 535 #if ENABLE_SELINUX
 536                 if (use_selinux) {
 537                         len = printf("%5u %-32.32s %s  ",
 538                                         p->pid,
 539                                         p->context ? p->context : "unknown",
 540                                         p->state);
 541                 } else
 542 #endif
 543                 {
 544                         const char *user = get_cached_username(p->uid);
 545                         //if (p->vsz == 0)
 546                         //      len = printf("%5u %-8.8s        %s ",
 547                         //              p->pid, user, p->state);
 548                         //else
 549                         {
 550                                 char buf6[6];
 551                                 smart_ulltoa5(p->vsz, buf6, " mgtpezy");
 552                                 buf6[5] = '\0';
 553                                 len = printf("%5u %-8.8s %s %s  ",
 554                                         p->pid, user, buf6, p->state);
 555                         }
 556                 }
 557
 558                 {
 559                         int sz = terminal_width - len;
 560                         char buf[sz + 1];
 561                         read_cmdline(buf, sz, p->pid, p->comm);
 562                         puts(buf);
 563                 }
 564         }
 565         if (ENABLE_FEATURE_CLEAN_UP)
 566                 clear_username_cache();
 567         return EXIT_SUCCESS;
 568 }
 569
 570 #endif /* ENABLE_DESKTOP */