The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_ps.c

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    1 /*-
    2  * Copyright (c) 1993 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/8.1/sys/ddb/db_ps.c 199583 2009-11-20 15:27:52Z jhb $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/cons.h>
   35 #include <sys/jail.h>
   36 #include <sys/kdb.h>
   37 #include <sys/linker_set.h>
   38 #include <sys/proc.h>
   39 #include <sys/sysent.h>
   40 #include <sys/systm.h>
   41 #include <vm/vm.h>
   42 #include <vm/vm_param.h>
   43 #include <vm/pmap.h>
   44 
   45 #include <ddb/ddb.h>
   46 
   47 static void     dumpthread(volatile struct proc *p, volatile struct thread *td,
   48                     int all);
   49 /*
   50  * At least one non-optional show-command must be implemented using
   51  * DB_SHOW_ALL_COMMAND() so that db_show_all_cmd_set gets created.
   52  * Here is one.
   53  */
   54 DB_SHOW_ALL_COMMAND(procs, db_procs_cmd)
   55 {
   56         db_ps(addr, have_addr, count, modif);
   57 }
   58 
   59 /*
   60  * Layout:
   61  * - column counts
   62  * - header
   63  * - single-threaded process
   64  * - multi-threaded process
   65  * - thread in a MT process
   66  *
   67  *          1         2         3         4         5         6         7
   68  * 1234567890123456789012345678901234567890123456789012345678901234567890
   69  *   pid  ppid  pgrp   uid   state   wmesg     wchan    cmd
   70  * <pid> <ppi> <pgi> <uid>  <stat> < wmesg > < wchan  > <name>
   71  * <pid> <ppi> <pgi> <uid>  <stat>  (threaded)          <command>
   72  * <tid >                   <stat> < wmesg > < wchan  > <name>
   73  *
   74  * For machines with 64-bit pointers, we expand the wchan field 8 more
   75  * characters.
   76  */
   77 void
   78 db_ps(db_expr_t addr, boolean_t hasaddr, db_expr_t count, char *modif)
   79 {
   80         volatile struct proc *p, *pp;
   81         volatile struct thread *td;
   82         struct ucred *cred;
   83         struct pgrp *pgrp;
   84         char state[9];
   85         int np, rflag, sflag, dflag, lflag, wflag;
   86 
   87         np = nprocs;
   88 
   89         if (!LIST_EMPTY(&allproc))
   90                 p = LIST_FIRST(&allproc);
   91         else
   92                 p = &proc0;
   93 
   94 #ifdef __LP64__
   95         db_printf("  pid  ppid  pgrp   uid   state   wmesg         wchan        cmd\n");
   96 #else
   97         db_printf("  pid  ppid  pgrp   uid   state   wmesg     wchan    cmd\n");
   98 #endif
   99         while (--np >= 0 && !db_pager_quit) {
  100                 if (p == NULL) {
  101                         db_printf("oops, ran out of processes early!\n");
  102                         break;
  103                 }
  104                 pp = p->p_pptr;
  105                 if (pp == NULL)
  106                         pp = p;
  107 
  108                 cred = p->p_ucred;
  109                 pgrp = p->p_pgrp;
  110                 db_printf("%5d %5d %5d %5d ", p->p_pid, pp->p_pid,
  111                     pgrp != NULL ? pgrp->pg_id : 0,
  112                     cred != NULL ? cred->cr_ruid : 0);
  113 
  114                 /* Determine our primary process state. */
  115                 switch (p->p_state) {
  116                 case PRS_NORMAL:
  117                         if (P_SHOULDSTOP(p))
  118                                 state[0] = 'T';
  119                         else {
  120                                 /*
  121                                  * One of D, L, R, S, W.  For a
  122                                  * multithreaded process we will use
  123                                  * the state of the thread with the
  124                                  * highest precedence.  The
  125                                  * precendence order from high to low
  126                                  * is R, L, D, S, W.  If no thread is
  127                                  * in a sane state we use '?' for our
  128                                  * primary state.
  129                                  */
  130                                 rflag = sflag = dflag = lflag = wflag = 0;
  131                                 FOREACH_THREAD_IN_PROC(p, td) {
  132                                         if (td->td_state == TDS_RUNNING ||
  133                                             td->td_state == TDS_RUNQ ||
  134                                             td->td_state == TDS_CAN_RUN)
  135                                                 rflag++;
  136                                         if (TD_ON_LOCK(td))
  137                                                 lflag++;
  138                                         if (TD_IS_SLEEPING(td)) {
  139                                                 if (!td->td_flags & TDF_SINTR)
  140                                                         dflag++;
  141                                                 else
  142                                                         sflag++;
  143                                         }
  144                                         if (TD_AWAITING_INTR(td))
  145                                                 wflag++;
  146                                 }
  147                                 if (rflag)
  148                                         state[0] = 'R';
  149                                 else if (lflag)
  150                                         state[0] = 'L';
  151                                 else if (dflag)
  152                                         state[0] = 'D';
  153                                 else if (sflag)
  154                                         state[0] = 'S';
  155                                 else if (wflag)
  156                                         state[0] = 'W';
  157                                 else
  158                                         state[0] = '?';                         
  159                         }
  160                         break;
  161                 case PRS_NEW:
  162                         state[0] = 'N';
  163                         break;
  164                 case PRS_ZOMBIE:
  165                         state[0] = 'Z';
  166                         break;
  167                 default:
  168                         state[0] = 'U';
  169                         break;
  170                 }
  171                 state[1] = '\0';
  172 
  173                 /* Additional process state flags. */
  174                 if (!p->p_flag & P_INMEM)
  175                         strlcat(state, "W", sizeof(state));
  176                 if (p->p_flag & P_TRACED)
  177                         strlcat(state, "X", sizeof(state));
  178                 if (p->p_flag & P_WEXIT && p->p_state != PRS_ZOMBIE)
  179                         strlcat(state, "E", sizeof(state));
  180                 if (p->p_flag & P_PPWAIT)
  181                         strlcat(state, "V", sizeof(state));
  182                 if (p->p_flag & P_SYSTEM || p->p_lock > 0)
  183                         strlcat(state, "L", sizeof(state));
  184                 if (p->p_session != NULL && SESS_LEADER(p))
  185                         strlcat(state, "s", sizeof(state));
  186                 /* Cheated here and didn't compare pgid's. */
  187                 if (p->p_flag & P_CONTROLT)
  188                         strlcat(state, "+", sizeof(state));
  189                 if (cred != NULL && jailed(cred))
  190                         strlcat(state, "J", sizeof(state));
  191                 db_printf(" %-6.6s ", state);
  192                 if (p->p_flag & P_HADTHREADS)
  193 #ifdef __LP64__
  194                         db_printf(" (threaded)                  %s\n",
  195                             p->p_comm);
  196 #else
  197                         db_printf(" (threaded)          %s\n", p->p_comm);
  198 #endif
  199                 FOREACH_THREAD_IN_PROC(p, td) {
  200                         dumpthread(p, td, p->p_flag & P_HADTHREADS);
  201                         if (db_pager_quit)
  202                                 break;
  203                 }
  204 
  205                 p = LIST_NEXT(p, p_list);
  206                 if (p == NULL && np > 0)
  207                         p = LIST_FIRST(&zombproc);
  208         }
  209 }
  210 
  211 static void
  212 dumpthread(volatile struct proc *p, volatile struct thread *td, int all)
  213 {
  214         char state[9], wprefix;
  215         const char *wmesg;
  216         void *wchan;
  217         
  218         if (all) {
  219                 db_printf("%6d                  ", td->td_tid);
  220                 switch (td->td_state) {
  221                 case TDS_RUNNING:
  222                         snprintf(state, sizeof(state), "Run");
  223                         break;
  224                 case TDS_RUNQ:
  225                         snprintf(state, sizeof(state), "RunQ");
  226                         break;
  227                 case TDS_CAN_RUN:
  228                         snprintf(state, sizeof(state), "CanRun");
  229                         break;
  230                 case TDS_INACTIVE:
  231                         snprintf(state, sizeof(state), "Inactv");
  232                         break;
  233                 case TDS_INHIBITED:
  234                         state[0] = '\0';
  235                         if (TD_ON_LOCK(td))
  236                                 strlcat(state, "L", sizeof(state));
  237                         if (TD_IS_SLEEPING(td)) {
  238                                 if (td->td_flags & TDF_SINTR)
  239                                         strlcat(state, "S", sizeof(state));
  240                                 else
  241                                         strlcat(state, "D", sizeof(state));
  242                         }
  243                         if (TD_IS_SWAPPED(td))
  244                                 strlcat(state, "W", sizeof(state));
  245                         if (TD_AWAITING_INTR(td))
  246                                 strlcat(state, "I", sizeof(state));
  247                         if (TD_IS_SUSPENDED(td))
  248                                 strlcat(state, "s", sizeof(state));
  249                         if (state[0] != '\0')
  250                                 break;
  251                 default:
  252                         snprintf(state, sizeof(state), "???");
  253                 }                       
  254                 db_printf(" %-6.6s ", state);
  255         }
  256         wprefix = ' ';
  257         if (TD_ON_LOCK(td)) {
  258                 wprefix = '*';
  259                 wmesg = td->td_lockname;
  260                 wchan = td->td_blocked;
  261         } else if (TD_ON_SLEEPQ(td)) {
  262                 wmesg = td->td_wmesg;
  263                 wchan = td->td_wchan;
  264         } else if (TD_IS_RUNNING(td)) {
  265                 snprintf(state, sizeof(state), "CPU %d", td->td_oncpu);
  266                 wmesg = state;
  267                 wchan = NULL;
  268         } else {
  269                 wmesg = "";
  270                 wchan = NULL;
  271         }
  272         db_printf("%c%-8.8s ", wprefix, wmesg);
  273         if (wchan == NULL)
  274 #ifdef __LP64__
  275                 db_printf("%18s ", "");
  276 #else
  277                 db_printf("%10s ", "");
  278 #endif
  279         else
  280                 db_printf("%p ", wchan);
  281         if (p->p_flag & P_SYSTEM)
  282                 db_printf("[");
  283         if (td->td_name[0] != '\0')
  284                 db_printf("%s", td->td_name);
  285         else
  286                 db_printf("%s", td->td_proc->p_comm);
  287         if (p->p_flag & P_SYSTEM)
  288                 db_printf("]");
  289         db_printf("\n");
  290 }
  291 
  292 DB_SHOW_COMMAND(thread, db_show_thread)
  293 {
  294         struct thread *td;
  295         struct lock_object *lock;
  296         boolean_t comma;
  297 
  298         /* Determine which thread to examine. */
  299         if (have_addr)
  300                 td = db_lookup_thread(addr, FALSE);
  301         else
  302                 td = kdb_thread;
  303         lock = (struct lock_object *)td->td_lock;
  304 
  305         db_printf("Thread %d at %p:\n", td->td_tid, td);
  306         db_printf(" proc (pid %d): %p\n", td->td_proc->p_pid, td->td_proc);
  307         if (td->td_name[0] != '\0')
  308                 db_printf(" name: %s\n", td->td_name);
  309         db_printf(" stack: %p-%p\n", (void *)td->td_kstack,
  310             (void *)(td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 1));
  311         db_printf(" flags: %#x ", td->td_flags);
  312         db_printf(" pflags: %#x\n", td->td_pflags);
  313         db_printf(" state: ");
  314         switch (td->td_state) {
  315         case TDS_INACTIVE:
  316                 db_printf("INACTIVE\n");
  317                 break;
  318         case TDS_CAN_RUN:
  319                 db_printf("CAN RUN\n");
  320                 break;
  321         case TDS_RUNQ:
  322                 db_printf("RUNQ\n");
  323                 break;
  324         case TDS_RUNNING:
  325                 db_printf("RUNNING (CPU %d)\n", td->td_oncpu);
  326                 break;
  327         case TDS_INHIBITED:
  328                 db_printf("INHIBITED: {");
  329                 comma = FALSE;
  330                 if (TD_IS_SLEEPING(td)) {
  331                         db_printf("SLEEPING");
  332                         comma = TRUE;
  333                 }
  334                 if (TD_IS_SUSPENDED(td)) {
  335                         if (comma)
  336                                 db_printf(", ");
  337                         db_printf("SUSPENDED");
  338                         comma = TRUE;
  339                 }
  340                 if (TD_IS_SWAPPED(td)) {
  341                         if (comma)
  342                                 db_printf(", ");
  343                         db_printf("SWAPPED");
  344                         comma = TRUE;
  345                 }
  346                 if (TD_ON_LOCK(td)) {
  347                         if (comma)
  348                                 db_printf(", ");
  349                         db_printf("LOCK");
  350                         comma = TRUE;
  351                 }
  352                 if (TD_AWAITING_INTR(td)) {
  353                         if (comma)
  354                                 db_printf(", ");
  355                         db_printf("IWAIT");
  356                 }
  357                 db_printf("}\n");
  358                 break;
  359         default:
  360                 db_printf("??? (%#x)\n", td->td_state);
  361                 break;
  362         }
  363         if (TD_ON_LOCK(td))
  364                 db_printf(" lock: %s  turnstile: %p\n", td->td_lockname,
  365                     td->td_blocked);
  366         if (TD_ON_SLEEPQ(td))
  367                 db_printf(" wmesg: %s  wchan: %p\n", td->td_wmesg,
  368                     td->td_wchan);
  369         db_printf(" priority: %d\n", td->td_priority);
  370         db_printf(" container lock: %s (%p)\n", lock->lo_name, lock);
  371 }
  372 
  373 DB_SHOW_COMMAND(proc, db_show_proc)
  374 {
  375         struct thread *td;
  376         struct proc *p;
  377         int i;
  378 
  379         /* Determine which process to examine. */
  380         if (have_addr)
  381                 p = db_lookup_proc(addr);
  382         else
  383                 p = kdb_thread->td_proc;
  384 
  385         db_printf("Process %d (%s) at %p:\n", p->p_pid, p->p_comm, p);
  386         db_printf(" state: ");
  387         switch (p->p_state) {
  388         case PRS_NEW:
  389                 db_printf("NEW\n");
  390                 break;
  391         case PRS_NORMAL:
  392                 db_printf("NORMAL\n");
  393                 break;
  394         case PRS_ZOMBIE:
  395                 db_printf("ZOMBIE\n");
  396                 break;
  397         default:
  398                 db_printf("??? (%#x)\n", p->p_state);
  399         }
  400         if (p->p_ucred != NULL) {
  401                 db_printf(" uid: %d  gids: ", p->p_ucred->cr_uid);
  402                 for (i = 0; i < p->p_ucred->cr_ngroups; i++) {
  403                         db_printf("%d", p->p_ucred->cr_groups[i]);
  404                         if (i < (p->p_ucred->cr_ngroups - 1))
  405                                 db_printf(", ");
  406                 }
  407                 db_printf("\n");
  408         }
  409         if (p->p_pptr != NULL)
  410                 db_printf(" parent: pid %d at %p\n", p->p_pptr->p_pid,
  411                     p->p_pptr);
  412         if (p->p_leader != NULL && p->p_leader != p)
  413                 db_printf(" leader: pid %d at %p\n", p->p_leader->p_pid,
  414                     p->p_leader);
  415         if (p->p_sysent != NULL)
  416                 db_printf(" ABI: %s\n", p->p_sysent->sv_name);
  417         if (p->p_args != NULL)
  418                 db_printf(" arguments: %.*s\n", (int)p->p_args->ar_length,
  419                     p->p_args->ar_args);
  420         db_printf(" threads: %d\n", p->p_numthreads);
  421         FOREACH_THREAD_IN_PROC(p, td) {
  422                 dumpthread(p, td, 1);
  423                 if (db_pager_quit)
  424                         break;
  425         }
  426 }

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