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 /* Print value to buf, max size+1 chars (including trailing '\0') */
  20
  21 static void func_user(char *buf, int size, const procps_status_t *ps)
  22 {
  23         safe_strncpy(buf, get_cached_username(ps->uid), size+1);
  24 }
  25
  26 static void func_comm(char *buf, int size, const procps_status_t *ps)
  27 {
  28         safe_strncpy(buf, ps->comm, size+1);
  29 }
  30
  31 static void func_args(char *buf, int size, const procps_status_t *ps)
  32 {
  33         read_cmdline(buf, size, ps->pid, ps->comm);
  34 }
  35
  36 static void func_pid(char *buf, int size, const procps_status_t *ps)
  37 {
  38         sprintf(buf, "%*u", size, ps->pid);
  39 }
  40
  41 static void func_ppid(char *buf, int size, const procps_status_t *ps)
  42 {
  43         sprintf(buf, "%*u", size, ps->ppid);
  44 }
  45
  46 static void func_pgid(char *buf, int size, const procps_status_t *ps)
  47 {
  48         sprintf(buf, "%*u", size, ps->pgid);
  49 }
  50
  51 static void put_lu(char *buf, int size, unsigned long u)
  52 {
  53         char buf5[5];
  54         smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
  55         sprintf(buf, "%.*s", size, buf5);
  56 }
  57
  58 static void func_vsz(char *buf, int size, const procps_status_t *ps)
  59 {
  60         put_lu(buf, size, ps->vsz);
  61 }
  62
  63 static void func_rss(char *buf, int size, const procps_status_t *ps)
  64 {
  65         put_lu(buf, size, ps->rss);
  66 }
  67
  68 static void func_tty(char *buf, int size, const procps_status_t *ps)
  69 {
  70         buf[0] = '?';
  71         buf[1] = '\0';
  72         if (ps->tty_major) /* tty field of "0" means "no tty" */
  73                 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
  74 }
  75
  76 #if ENABLE_SELINUX
  77 static void func_label(char *buf, int size, const procps_status_t *ps)
  78 {
  79         safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
  80 }
  81 #endif
  82
  83 /*
  84 static void func_nice(char *buf, int size, const procps_status_t *ps)
  85 {
  86         ps->???
  87 }
  88
  89 static void func_etime(char *buf, int size, const procps_status_t *ps)
  90 {
  91         elapled time [[dd-]hh:]mm:ss
  92 }
  93
  94 static void func_time(char *buf, int size, const procps_status_t *ps)
  95 {
  96         cumulative time [[dd-]hh:]mm:ss
  97 }
  98
  99 static void func_pcpu(char *buf, int size, const procps_status_t *ps)
 100 {
 101 }
 102 */
 103
 104 typedef struct {
 105         uint16_t width;
 106         char name[6];
 107         const char *header;
 108         void (*f)(char *buf, int size, const procps_status_t *ps);
 109         int ps_flags;
 110 } ps_out_t;
 111
 112 static const ps_out_t out_spec[] = {
 113 // Mandated by POSIX:
 114         { 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
 115         { 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
 116         { 256                , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
 117         { 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
 118         { 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
 119         { 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
 120 //      { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_        },
 121 //      { sizeof("GROUP"  )-1, "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
 122 //      { sizeof("NI"     )-1, "nice"  ,"NI"     ,func_nice  ,PSSCAN_        },
 123 //      { sizeof("%CPU"   )-1, "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
 124 //      { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID  },
 125 //      { sizeof("RUSER"  )-1, "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_UIDGID  },
 126 //      { sizeof("TIME"   )-1, "time"  ,"TIME"   ,func_time  ,PSSCAN_        },
 127         { 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
 128         { 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
 129 // Not mandated by POSIX, but useful:
 130         { 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
 131 #if ENABLE_SELINUX
 132         { 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
 133 #endif
 134 };
 135
 136 #if ENABLE_SELINUX
 137 #define SELINIX_O_PREFIX "label,"
 138 #define DEFAULT_O_STR    SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
 139 #else
 140 #define DEFAULT_O_STR    "pid,user" /* TODO: ,vsz,stat */ ",args"
 141 #endif
 142
 143 struct globals {
 144         ps_out_t* out;
 145         int out_cnt;
 146         int print_header;
 147         int need_flags;
 148         char *buffer;
 149         unsigned terminal_width;
 150         char default_o[sizeof(DEFAULT_O_STR)];
 151 };
 152 #define G (*(struct globals*)&bb_common_bufsiz1)
 153 #define out            (G.out           )
 154 #define out_cnt        (G.out_cnt       )
 155 #define print_header   (G.print_header  )
 156 #define need_flags     (G.need_flags    )
 157 #define buffer         (G.buffer        )
 158 #define terminal_width (G.terminal_width)
 159 #define default_o      (G.default_o     )
 160
 161 static ps_out_t* new_out_t(void)
 162 {
 163         int i = out_cnt++;
 164         out = xrealloc(out, out_cnt * sizeof(*out));
 165         return &out[i];
 166 }
 167
 168 static const ps_out_t* find_out_spec(const char *name)
 169 {
 170         int i;
 171         for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
 172                 if (!strcmp(name, out_spec[i].name))
 173                         return &out_spec[i];
 174         }
 175         bb_error_msg_and_die("bad -o argument '%s'", name);
 176 }
 177
 178 static void parse_o(char* opt)
 179 {
 180         ps_out_t* new;
 181         // POSIX: "-o is blank- or comma-separated list" (FIXME)
 182         char *comma, *equal;
 183         while (1) {
 184                 comma = strchr(opt, ',');
 185                 equal = strchr(opt, '=');
 186                 if (comma && (!equal || equal > comma)) {
 187                         *comma = '\0';
 188                         *new_out_t() = *find_out_spec(opt);
 189                         *comma = ',';
 190                         opt = comma + 1;
 191                         continue;
 192                 }
 193                 break;
 194         }
 195         // opt points to last spec in comma separated list.
 196         // This one can have =HEADER part.
 197         new = new_out_t();
 198         if (equal)
 199                 *equal = '\0';
 200         *new = *find_out_spec(opt);
 201         if (equal) {
 202                 *equal = '=';
 203                 new->header = equal + 1;
 204                 // POSIX: the field widths shall be ... at least as wide as
 205                 // the header text (default or overridden value).
 206                 // If the header text is null, such as -o user=,
 207                 // the field width shall be at least as wide as the
 208                 // default header text
 209                 if (new->header[0]) {
 210                         new->width = strlen(new->header);
 211                         print_header = 1;
 212                 }
 213         } else
 214                 print_header = 1;
 215 }
 216
 217 static void post_process(void)
 218 {
 219         int i;
 220         int width = 0;
 221         for (i = 0; i < out_cnt; i++) {
 222                 need_flags |= out[i].ps_flags;
 223                 if (out[i].header[0]) {
 224                         print_header = 1;
 225                 }
 226                 width += out[i].width + 1; /* "FIELD " */
 227         }
 228 #if ENABLE_SELINUX
 229         if (!is_selinux_enabled())
 230                 need_flags &= ~PSSCAN_CONTEXT;
 231 #endif
 232         buffer = xmalloc(width + 1); /* for trailing \0 */
 233 }
 234
 235 static void format_header(void)
 236 {
 237         int i;
 238         ps_out_t* op;
 239         char *p;
 240
 241         if (!print_header)
 242                 return;
 243         p = buffer;
 244         i = 0;
 245         if (out_cnt) {
 246                 while (1) {
 247                         op = &out[i];
 248                         if (++i == out_cnt) /* do not pad last field */
 249                                 break;
 250                         p += sprintf(p, "%-*s ", op->width, op->header);
 251                 }
 252                 strcpy(p, op->header);
 253         }
 254         printf("%.*s\n", terminal_width, buffer);
 255 }
 256
 257 static void format_process(const procps_status_t *ps)
 258 {
 259         int i, len;
 260         char *p = buffer;
 261         i = 0;
 262         if (out_cnt) while (1) {
 263                 out[i].f(p, out[i].width, ps);
 264                 // POSIX: Any field need not be meaningful in all
 265                 // implementations. In such a case a hyphen ( '-' )
 266                 // should be output in place of the field value.
 267                 if (!p[0]) {
 268                         p[0] = '-';
 269                         p[1] = '\0';
 270                 }
 271                 len = strlen(p);
 272                 p += len;
 273                 len = out[i].width - len + 1;
 274                 if (++i == out_cnt) /* do not pad last field */
 275                         break;
 276                 p += sprintf(p, "%*s", len, "");
 277         }
 278         printf("%.*s\n", terminal_width, buffer);
 279 }
 280
 281 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 282 int ps_main(int argc, char **argv)
 283 {
 284         procps_status_t *p;
 285         llist_t* opt_o = NULL;
 286         USE_SELINUX(int opt;)
 287
 288         // POSIX:
 289         // -a  Write information for all processes associated with terminals
 290         //     Implementations may omit session leaders from this list
 291         // -A  Write information for all processes
 292         // -d  Write information for all processes, except session leaders
 293         // -e  Write information for all processes (equivalent to -A.)
 294         // -f  Generate a full listing
 295         // -l  Generate a long listing
 296         // -o col1,col2,col3=header
 297         //     Select which columns to display
 298         /* We allow (and ignore) most of the above. FIXME */
 299         opt_complementary = "o::";
 300         USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
 301         if (opt_o) {
 302                 do {
 303                         parse_o(opt_o->data);
 304                         opt_o = opt_o->link;
 305                 } while (opt_o);
 306         } else {
 307                 /* Below: parse_o() needs char*, NOT const char*... */
 308 #if ENABLE_SELINUX
 309                 if (!(opt & 1) || !is_selinux_enabled()) {
 310                         /* no -Z or no SELinux: do not show LABEL */
 311                         strcpy(default_o, DEFAULT_O_STR + sizeof(SELINIX_O_PREFIX)-1);
 312                 } else
 313 #endif
 314                 {
 315                         strcpy(default_o, DEFAULT_O_STR);
 316                 }
 317                 parse_o(default_o);
 318         }
 319         post_process();
 320
 321         /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
 322          * and such large widths */
 323         terminal_width = MAX_WIDTH;
 324         if (isatty(1)) {
 325                 get_terminal_width_height(0, &terminal_width, NULL);
 326                 if (--terminal_width > MAX_WIDTH)
 327                         terminal_width = MAX_WIDTH;
 328         }
 329         format_header();
 330
 331         p = NULL;
 332         while ((p = procps_scan(p, need_flags))) {
 333                 format_process(p);
 334         }
 335
 336         return EXIT_SUCCESS;
 337 }
 338
 339
 340 #else /* !ENABLE_DESKTOP */
 341
 342
 343 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 344 int ps_main(int argc, char **argv)
 345 {
 346         procps_status_t *p = NULL;
 347         int len;
 348         SKIP_SELINUX(const) int use_selinux = 0;
 349         USE_SELINUX(int i;)
 350 #if !ENABLE_FEATURE_PS_WIDE
 351         enum { terminal_width = 79 };
 352 #else
 353         int terminal_width;
 354         int w_count = 0;
 355 #endif
 356
 357 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
 358 #if ENABLE_FEATURE_PS_WIDE
 359         opt_complementary = "-:ww";
 360         USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
 361         /* if w is given once, GNU ps sets the width to 132,
 362          * if w is given more than once, it is "unlimited"
 363          */
 364         if (w_count) {
 365                 terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
 366         } else {
 367                 get_terminal_width_height(0, &terminal_width, NULL);
 368                 /* Go one less... */
 369                 if (--terminal_width > MAX_WIDTH)
 370                         terminal_width = MAX_WIDTH;
 371         }
 372 #else /* only ENABLE_SELINUX */
 373         i = getopt32(argv, "Z");
 374 #endif
 375 #if ENABLE_SELINUX
 376         if ((i & 1) && is_selinux_enabled())
 377                 use_selinux = PSSCAN_CONTEXT;
 378 #endif
 379 #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
 380
 381         if (use_selinux)
 382                 puts("  PID Context                          Stat Command");
 383         else
 384                 puts("  PID  Uid        VSZ Stat Command");
 385
 386         while ((p = procps_scan(p, 0
 387                         | PSSCAN_PID
 388                         | PSSCAN_UIDGID
 389                         | PSSCAN_STATE
 390                         | PSSCAN_VSZ
 391                         | PSSCAN_COMM
 392                         | use_selinux
 393         ))) {
 394 #if ENABLE_SELINUX
 395                 if (use_selinux) {
 396                         len = printf("%5u %-32s %s ",
 397                                         p->pid,
 398                                         p->context ? p->context : "unknown",
 399                                         p->state);
 400                 } else
 401 #endif
 402                 {
 403                         const char *user = get_cached_username(p->uid);
 404                         if (p->vsz == 0)
 405                                 len = printf("%5u %-8s        %s ",
 406                                         p->pid, user, p->state);
 407                         else
 408                                 len = printf("%5u %-8s %6lu %s ",
 409                                         p->pid, user, p->vsz, p->state);
 410                 }
 411
 412                 {
 413                         int sz = terminal_width - len;
 414                         char buf[sz + 1];
 415                         read_cmdline(buf, sz, p->pid, p->comm);
 416                         puts(buf);
 417                 }
 418         }
 419         if (ENABLE_FEATURE_CLEAN_UP)
 420                 clear_username_cache();
 421         return EXIT_SUCCESS;
 422 }
 423
 424 #endif /* ENABLE_DESKTOP */