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  *
   7  * Licensed under the GPL version 2, see the file LICENSE in this tarball.
   8  */
   9
  10 #include "busybox.h"
  11
  12 #if ENABLE_DESKTOP
  13
  14 /* Print value to buf, max size+1 chars (including trailing '\0') */
  15
  16 static void func_user(char *buf, int size, const procps_status_t *ps)
  17 {
  18         safe_strncpy(buf, get_cached_username(ps->uid), size+1);
  19 }
  20
  21 static void func_comm(char *buf, int size, const procps_status_t *ps)
  22 {
  23         safe_strncpy(buf, ps->comm, size+1);
  24 }
  25
  26 static void func_args(char *buf, int size, const procps_status_t *ps)
  27 {
  28         buf[0] = '\0';
  29         if (ps->cmd)
  30                 safe_strncpy(buf, ps->cmd, size+1);
  31         else if (size >= 2)
  32                 snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
  33 }
  34
  35 static void func_pid(char *buf, int size, const procps_status_t *ps)
  36 {
  37         snprintf(buf, size+1, "%*u", size, ps->pid);
  38 }
  39
  40 static void func_ppid(char *buf, int size, const procps_status_t *ps)
  41 {
  42         snprintf(buf, size+1, "%*u", size, ps->ppid);
  43 }
  44
  45 static void func_pgid(char *buf, int size, const procps_status_t *ps)
  46 {
  47         snprintf(buf, size+1, "%*u", size, ps->pgid);
  48 }
  49
  50 static void func_vsz(char *buf, int size, const procps_status_t *ps)
  51 {
  52         char buf5[5];
  53         smart_ulltoa5( ((unsigned long long)ps->vsz) << 10, buf5);
  54         snprintf(buf, size+1, "%.*s", size, buf5);
  55 }
  56
  57 /*
  58 void func_nice(char *buf, int size, const procps_status_t *ps)
  59 {
  60         ps->???
  61 }
  62
  63 void func_etime(char *buf, int size, const procps_status_t *ps)
  64 {
  65         elapled time [[dd-]hh:]mm:ss
  66 }
  67
  68 void func_time(char *buf, int size, const procps_status_t *ps)
  69 {
  70         cumulative time [[dd-]hh:]mm:ss
  71 }
  72
  73 void func_pcpu(char *buf, int size, const procps_status_t *ps)
  74 {
  75 }
  76
  77 void func_tty(char *buf, int size, const procps_status_t *ps)
  78 {
  79 }
  80 */
  81
  82 typedef struct {
  83         char name[8];
  84         const char *header;
  85         void (*f)(char *buf, int size, const procps_status_t *ps);
  86         int ps_flags;
  87         int width;
  88 } ps_out_t;
  89
  90 static const ps_out_t out_spec[] = {
  91 // Mandated by POSIX:
  92         { "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID,8                   },
  93         { "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM  ,16                  },
  94         { "args"  ,"COMMAND",func_args  ,PSSCAN_CMD|PSSCAN_COMM,256        },
  95         { "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID   ,5                   },
  96         { "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID  ,5                   },
  97         { "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID  ,5                   },
  98 //      { "etime" ,"ELAPSED",func_etime ,PSSCAN_      ,sizeof("ELAPSED")-1 },
  99 //      { "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID,sizeof("GROUP"  )-1 },
 100 //      { "nice"  ,"NI"     ,func_nice  ,PSSCAN_      ,sizeof("NI"     )-1 },
 101 //      { "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_      ,sizeof("%CPU"   )-1 },
 102 //      { "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
 103 //      { "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER"  )-1 },
 104 //      { "time"  ,"TIME"   ,func_time  ,PSSCAN_      ,sizeof("TIME"   )-1 },
 105 //      { "tty"   ,"TT"     ,func_tty   ,PSSCAN_      ,sizeof("TT"     )-1 },
 106         { "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ   ,4                   },
 107 // Not mandated by POSIX:
 108 //      { "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS   ,4                   },
 109 };
 110
 111 #define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )
 112
 113 static ps_out_t* out;
 114 static int out_cnt;
 115 static int print_header;
 116 static int ps_flags;
 117 static char *buffer;
 118 static unsigned terminal_width;
 119
 120
 121 static ps_out_t* new_out_t(void)
 122 {
 123         int i = out_cnt++;
 124         out = xrealloc(out, out_cnt * sizeof(*out));
 125         return &out[i];
 126 }
 127
 128 static const ps_out_t* find_out_spec(const char *name)
 129 {
 130         int i;
 131         for (i = 0; i < VEC_SIZE(out_spec); i++) {
 132                 if (!strcmp(name, out_spec[i].name))
 133                         return &out_spec[i];
 134         }
 135         bb_error_msg_and_die("bad -o argument '%s'", name);
 136 }
 137
 138 static void parse_o(char* opt)
 139 {
 140         ps_out_t* new;
 141         // POSIX: "-o is blank- or comma-separated list" (FIXME)
 142         char *comma, *equal;
 143         while (1) {
 144                 comma = strchr(opt, ',');
 145                 equal = strchr(opt, '=');
 146                 if (comma && (!equal || equal > comma)) {
 147                         *comma = '\0';
 148                         *new_out_t() = *find_out_spec(opt);
 149                         *comma = ',';
 150                         opt = comma + 1;
 151                         continue;
 152                 }
 153                 break;
 154         }
 155         new = new_out_t();
 156         if (equal)
 157                 *equal = '\0';
 158         *new = *find_out_spec(opt);
 159         if (equal) {
 160                 *equal = '=';
 161                 new->header = equal + 1;
 162                 // POSIX: the field widths shall be ... at least as wide as
 163                 // the header text (default or overridden value).
 164                 // If the header text is null, such as -o user=,
 165                 // the field width shall be at least as wide as the
 166                 // default header text
 167                 if (new->header[0]) {
 168                         new->width = strlen(new->header);
 169                         print_header = 1;
 170                 }
 171         } else
 172                 print_header = 1;
 173 }
 174
 175 static void post_process(void)
 176 {
 177         int i;
 178         int width = 0;
 179         for (i = 0; i < out_cnt; i++) {
 180                 ps_flags |= out[i].ps_flags;
 181                 if (out[i].header[0]) {
 182                         print_header = 1;
 183                 }
 184                 width += out[i].width + 1; /* "FIELD " */
 185         }
 186         buffer = xmalloc(width + 1); /* for trailing \0 */
 187 }
 188
 189 static void format_header(void)
 190 {
 191         int i;
 192         ps_out_t* op;
 193         char *p = buffer;
 194         if (!print_header)
 195                 return;
 196         i = 0;
 197         if (out_cnt) {
 198                 while (1) {
 199                         op = &out[i];
 200                         if (++i == out_cnt) /* do not pad last field */
 201                                 break;
 202                         p += sprintf(p, "%-*s ", op->width, op->header);
 203                 }
 204                 strcpy(p, op->header);
 205         }
 206         printf("%.*s\n", terminal_width, buffer);
 207 }
 208
 209 static void format_process(const procps_status_t *ps)
 210 {
 211         int i, len;
 212         char *p = buffer;
 213         i = 0;
 214         if (out_cnt) while (1) {
 215                 out[i].f(p, out[i].width, ps);
 216                 // POSIX: Any field need not be meaningful in all
 217                 // implementations. In such a case a hyphen ( '-' )
 218                 // should be output in place of the field value.
 219                 if (!p[0]) {
 220                         p[0] = '-';
 221                         p[1] = '\0';
 222                 }
 223                 len = strlen(p);
 224                 p += len;
 225                 len = out[i].width - len + 1;
 226                 if (++i == out_cnt) /* do not pad last field */
 227                         break;
 228                 p += sprintf(p, "%*s", len, "");
 229         }
 230         printf("%.*s\n", terminal_width, buffer);
 231 }
 232
 233 /* Cannot be const: parse_o() will choke */
 234 static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";
 235
 236 int ps_main(int argc, char **argv);
 237 int ps_main(int argc, char **argv)
 238 {
 239         procps_status_t *p;
 240         llist_t* opt_o = NULL;
 241
 242         // POSIX:
 243         // -a  Write information for all processes associated with terminals
 244         //     Implementations may omit session leaders from this list
 245         // -A  Write information for all processes
 246         // -d  Write information for all processes, except session leaders
 247         // -e  Write information for all processes (equivalent to -A.)
 248         // -f  Generate a full listing
 249         // -l  Generate a long listing
 250         // -o col1,col2,col3=header
 251         //     Select which columns to distplay
 252         /* We allow (and ignore) most of the above. FIXME */
 253         opt_complementary = "o::";
 254         getopt32(argc, argv, "o:aAdefl", &opt_o);
 255         if (opt_o) {
 256                 do {
 257                         parse_o(opt_o->data);
 258                         opt_o = opt_o->link;
 259                 } while (opt_o);
 260         } else
 261                 parse_o(default_o);
 262         post_process();
 263
 264         /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
 265          * and such large widths */
 266         terminal_width = 30000;
 267         if (isatty(1)) {
 268                 get_terminal_width_height(1, &terminal_width, NULL);
 269                 terminal_width--;
 270         }
 271         format_header();
 272
 273         p = NULL;
 274         while ((p = procps_scan(p, ps_flags))) {
 275                 format_process(p);
 276         }
 277
 278         return EXIT_SUCCESS;
 279 }
 280
 281
 282 #else /* !ENABLE_DESKTOP */
 283
 284
 285 int ps_main(int argc, char **argv);
 286 int ps_main(int argc, char **argv)
 287 {
 288         procps_status_t *p = NULL;
 289         int i, len;
 290         SKIP_SELINUX(const) int use_selinux = 0;
 291         USE_SELINUX(security_context_t sid = NULL;)
 292 #if !ENABLE_FEATURE_PS_WIDE
 293         enum { terminal_width = 79 };
 294 #else
 295         int terminal_width;
 296         int w_count = 0;
 297 #endif
 298
 299 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
 300 #if ENABLE_FEATURE_PS_WIDE
 301         opt_complementary = "-:ww";
 302         USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("Z") "w", &w_count);
 303         /* if w is given once, GNU ps sets the width to 132,
 304          * if w is given more than once, it is "unlimited"
 305          */
 306         if (w_count) {
 307                 terminal_width = (w_count==1) ? 132 : INT_MAX;
 308         } else {
 309                 get_terminal_width_height(1, &terminal_width, NULL);
 310                 /* Go one less... */
 311                 terminal_width--;
 312         }
 313 #else /* only ENABLE_SELINUX */
 314         i = getopt32(argc, argv, "Z");
 315 #endif
 316 #if ENABLE_SELINUX
 317         if ((i & 1) && is_selinux_enabled())
 318                 use_selinux = 1;
 319 #endif
 320 #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
 321
 322         if (use_selinux)
 323                 puts("  PID Context                          Stat Command");
 324         else
 325                 puts("  PID  Uid        VSZ Stat Command");
 326
 327         while ((p = procps_scan(p, 0
 328                         | PSSCAN_PID
 329                         | PSSCAN_UIDGID
 330                         | PSSCAN_STATE
 331                         | PSSCAN_VSZ
 332                         | PSSCAN_CMD
 333         ))) {
 334                 char *namecmd = p->cmd;
 335 #if ENABLE_SELINUX
 336                 if (use_selinux) {
 337                         char sbuf[128];
 338                         len = sizeof(sbuf);
 339
 340                         if (is_selinux_enabled()) {
 341                                 if (getpidcon(p->pid, &sid) < 0)
 342                                         sid = NULL;
 343                         }
 344
 345                         if (sid) {
 346                                 /* I assume sid initialized with NULL */
 347                                 len = strlen(sid) + 1;
 348                                 safe_strncpy(sbuf, sid, len);
 349                                 freecon(sid);
 350                                 sid = NULL;
 351                         } else {
 352                                 safe_strncpy(sbuf, "unknown", 7);
 353                         }
 354                         len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
 355                 } else
 356 #endif
 357                 {
 358                         const char *user = get_cached_username(p->uid);
 359                         if (p->vsz == 0)
 360                                 len = printf("%5u %-8s        %s ",
 361                                         p->pid, user, p->state);
 362                         else
 363                                 len = printf("%5u %-8s %6ld %s ",
 364                                         p->pid, user, p->vsz, p->state);
 365                 }
 366
 367                 i = terminal_width-len;
 368
 369                 if (namecmd && namecmd[0]) {
 370                         if (i < 0)
 371                                 i = 0;
 372                         if (strlen(namecmd) > (size_t)i)
 373                                 namecmd[i] = 0;
 374                         puts(namecmd);
 375                 } else {
 376                         namecmd = p->comm;
 377                         if (i < 2)
 378                                 i = 2;
 379                         if (strlen(namecmd) > ((size_t)i-2))
 380                                 namecmd[i-2] = 0;
 381                         printf("[%s]\n", namecmd);
 382                 }
 383         }
 384         if (ENABLE_FEATURE_CLEAN_UP)
 385                 clear_username_cache();
 386         return EXIT_SUCCESS;
 387 }
 388
 389 #endif /* ENABLE_DESKTOP */