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/10.2/sys/ddb/db_ps.c 273265 2014-10-18 19:22:59Z pfg $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/cons.h>
   35 #include <sys/jail.h>
   36 #include <sys/kdb.h>
   37 #include <sys/proc.h>
   38 #include <sys/sysent.h>
   39 #include <sys/systm.h>
   40 #include <sys/_kstack_cache.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)                  ");
  195 #else
  196                         db_printf(" (threaded)          ");
  197 #endif
  198                         if (p->p_flag & P_SYSTEM)
  199                                 db_printf("[");
  200                         db_printf("%s", p->p_comm);
  201                         if (p->p_flag & P_SYSTEM)
  202                                 db_printf("]");
  203                         db_printf("\n");
  204                 }
  205                 FOREACH_THREAD_IN_PROC(p, td) {
  206                         dumpthread(p, td, p->p_flag & P_HADTHREADS);
  207                         if (db_pager_quit)
  208                                 break;
  209                 }
  210 
  211                 p = LIST_NEXT(p, p_list);
  212                 if (p == NULL && np > 0)
  213                         p = LIST_FIRST(&zombproc);
  214         }
  215 }
  216 
  217 static void
  218 dumpthread(volatile struct proc *p, volatile struct thread *td, int all)
  219 {
  220         char state[9], wprefix;
  221         const char *wmesg;
  222         void *wchan;
  223         
  224         if (all) {
  225                 db_printf("%6d                  ", td->td_tid);
  226                 switch (td->td_state) {
  227                 case TDS_RUNNING:
  228                         snprintf(state, sizeof(state), "Run");
  229                         break;
  230                 case TDS_RUNQ:
  231                         snprintf(state, sizeof(state), "RunQ");
  232                         break;
  233                 case TDS_CAN_RUN:
  234                         snprintf(state, sizeof(state), "CanRun");
  235                         break;
  236                 case TDS_INACTIVE:
  237                         snprintf(state, sizeof(state), "Inactv");
  238                         break;
  239                 case TDS_INHIBITED:
  240                         state[0] = '\0';
  241                         if (TD_ON_LOCK(td))
  242                                 strlcat(state, "L", sizeof(state));
  243                         if (TD_IS_SLEEPING(td)) {
  244                                 if (td->td_flags & TDF_SINTR)
  245                                         strlcat(state, "S", sizeof(state));
  246                                 else
  247                                         strlcat(state, "D", sizeof(state));
  248                         }
  249                         if (TD_IS_SWAPPED(td))
  250                                 strlcat(state, "W", sizeof(state));
  251                         if (TD_AWAITING_INTR(td))
  252                                 strlcat(state, "I", sizeof(state));
  253                         if (TD_IS_SUSPENDED(td))
  254                                 strlcat(state, "s", sizeof(state));
  255                         if (state[0] != '\0')
  256                                 break;
  257                 default:
  258                         snprintf(state, sizeof(state), "???");
  259                 }                       
  260                 db_printf(" %-6.6s ", state);
  261         }
  262         wprefix = ' ';
  263         if (TD_ON_LOCK(td)) {
  264                 wprefix = '*';
  265                 wmesg = td->td_lockname;
  266                 wchan = td->td_blocked;
  267         } else if (TD_ON_SLEEPQ(td)) {
  268                 wmesg = td->td_wmesg;
  269                 wchan = td->td_wchan;
  270         } else if (TD_IS_RUNNING(td)) {
  271                 snprintf(state, sizeof(state), "CPU %d", td->td_oncpu);
  272                 wmesg = state;
  273                 wchan = NULL;
  274         } else {
  275                 wmesg = "";
  276                 wchan = NULL;
  277         }
  278         db_printf("%c%-8.8s ", wprefix, wmesg);
  279         if (wchan == NULL)
  280 #ifdef __LP64__
  281                 db_printf("%18s ", "");
  282 #else
  283                 db_printf("%10s ", "");
  284 #endif
  285         else
  286                 db_printf("%p ", wchan);
  287         if (p->p_flag & P_SYSTEM)
  288                 db_printf("[");
  289         if (td->td_name[0] != '\0')
  290                 db_printf("%s", td->td_name);
  291         else
  292                 db_printf("%s", td->td_proc->p_comm);
  293         if (p->p_flag & P_SYSTEM)
  294                 db_printf("]");
  295         db_printf("\n");
  296 }
  297 
  298 DB_SHOW_COMMAND(thread, db_show_thread)
  299 {
  300         struct thread *td;
  301         struct lock_object *lock;
  302         boolean_t comma;
  303 
  304         /* Determine which thread to examine. */
  305         if (have_addr)
  306                 td = db_lookup_thread(addr, FALSE);
  307         else
  308                 td = kdb_thread;
  309         lock = (struct lock_object *)td->td_lock;
  310 
  311         db_printf("Thread %d at %p:\n", td->td_tid, td);
  312         db_printf(" proc (pid %d): %p\n", td->td_proc->p_pid, td->td_proc);
  313         if (td->td_name[0] != '\0')
  314                 db_printf(" name: %s\n", td->td_name);
  315         db_printf(" stack: %p-%p\n", (void *)td->td_kstack,
  316             (void *)(td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 1));
  317         db_printf(" flags: %#x ", td->td_flags);
  318         db_printf(" pflags: %#x\n", td->td_pflags);
  319         db_printf(" state: ");
  320         switch (td->td_state) {
  321         case TDS_INACTIVE:
  322                 db_printf("INACTIVE\n");
  323                 break;
  324         case TDS_CAN_RUN:
  325                 db_printf("CAN RUN\n");
  326                 break;
  327         case TDS_RUNQ:
  328                 db_printf("RUNQ\n");
  329                 break;
  330         case TDS_RUNNING:
  331                 db_printf("RUNNING (CPU %d)\n", td->td_oncpu);
  332                 break;
  333         case TDS_INHIBITED:
  334                 db_printf("INHIBITED: {");
  335                 comma = FALSE;
  336                 if (TD_IS_SLEEPING(td)) {
  337                         db_printf("SLEEPING");
  338                         comma = TRUE;
  339                 }
  340                 if (TD_IS_SUSPENDED(td)) {
  341                         if (comma)
  342                                 db_printf(", ");
  343                         db_printf("SUSPENDED");
  344                         comma = TRUE;
  345                 }
  346                 if (TD_IS_SWAPPED(td)) {
  347                         if (comma)
  348                                 db_printf(", ");
  349                         db_printf("SWAPPED");
  350                         comma = TRUE;
  351                 }
  352                 if (TD_ON_LOCK(td)) {
  353                         if (comma)
  354                                 db_printf(", ");
  355                         db_printf("LOCK");
  356                         comma = TRUE;
  357                 }
  358                 if (TD_AWAITING_INTR(td)) {
  359                         if (comma)
  360                                 db_printf(", ");
  361                         db_printf("IWAIT");
  362                 }
  363                 db_printf("}\n");
  364                 break;
  365         default:
  366                 db_printf("??? (%#x)\n", td->td_state);
  367                 break;
  368         }
  369         if (TD_ON_LOCK(td))
  370                 db_printf(" lock: %s  turnstile: %p\n", td->td_lockname,
  371                     td->td_blocked);
  372         if (TD_ON_SLEEPQ(td))
  373                 db_printf(" wmesg: %s  wchan: %p\n", td->td_wmesg,
  374                     td->td_wchan);
  375         db_printf(" priority: %d\n", td->td_priority);
  376         db_printf(" container lock: %s (%p)\n", lock->lo_name, lock);
  377 }
  378 
  379 DB_SHOW_COMMAND(proc, db_show_proc)
  380 {
  381         struct thread *td;
  382         struct proc *p;
  383         int i;
  384 
  385         /* Determine which process to examine. */
  386         if (have_addr)
  387                 p = db_lookup_proc(addr);
  388         else
  389                 p = kdb_thread->td_proc;
  390 
  391         db_printf("Process %d (%s) at %p:\n", p->p_pid, p->p_comm, p);
  392         db_printf(" state: ");
  393         switch (p->p_state) {
  394         case PRS_NEW:
  395                 db_printf("NEW\n");
  396                 break;
  397         case PRS_NORMAL:
  398                 db_printf("NORMAL\n");
  399                 break;
  400         case PRS_ZOMBIE:
  401                 db_printf("ZOMBIE\n");
  402                 break;
  403         default:
  404                 db_printf("??? (%#x)\n", p->p_state);
  405         }
  406         if (p->p_ucred != NULL) {
  407                 db_printf(" uid: %d  gids: ", p->p_ucred->cr_uid);
  408                 for (i = 0; i < p->p_ucred->cr_ngroups; i++) {
  409                         db_printf("%d", p->p_ucred->cr_groups[i]);
  410                         if (i < (p->p_ucred->cr_ngroups - 1))
  411                                 db_printf(", ");
  412                 }
  413                 db_printf("\n");
  414         }
  415         if (p->p_pptr != NULL)
  416                 db_printf(" parent: pid %d at %p\n", p->p_pptr->p_pid,
  417                     p->p_pptr);
  418         if (p->p_leader != NULL && p->p_leader != p)
  419                 db_printf(" leader: pid %d at %p\n", p->p_leader->p_pid,
  420                     p->p_leader);
  421         if (p->p_sysent != NULL)
  422                 db_printf(" ABI: %s\n", p->p_sysent->sv_name);
  423         if (p->p_args != NULL)
  424                 db_printf(" arguments: %.*s\n", (int)p->p_args->ar_length,
  425                     p->p_args->ar_args);
  426         db_printf(" threads: %d\n", p->p_numthreads);
  427         FOREACH_THREAD_IN_PROC(p, td) {
  428                 dumpthread(p, td, 1);
  429                 if (db_pager_quit)
  430                         break;
  431         }
  432 }
  433 
  434 void
  435 db_findstack_cmd(db_expr_t addr, boolean_t have_addr,
  436     db_expr_t dummy3 __unused, char *dummy4 __unused)
  437 {
  438         struct proc *p;
  439         struct thread *td;
  440         struct kstack_cache_entry *ks_ce;
  441         vm_offset_t saddr;
  442 
  443         if (have_addr)
  444                 saddr = addr;
  445         else {
  446                 db_printf("Usage: findstack <address>\n");
  447                 return;
  448         }
  449 
  450         FOREACH_PROC_IN_SYSTEM(p) {
  451                 FOREACH_THREAD_IN_PROC(p, td) {
  452                         if (td->td_kstack <= saddr && saddr < td->td_kstack +
  453                             PAGE_SIZE * td->td_kstack_pages) {
  454                                 db_printf("Thread %p\n", td);
  455                                 return;
  456                         }
  457                 }
  458         }
  459 
  460         for (ks_ce = kstack_cache; ks_ce != NULL;
  461              ks_ce = ks_ce->next_ks_entry) {
  462                 if ((vm_offset_t)ks_ce <= saddr && saddr < (vm_offset_t)ks_ce +
  463                     PAGE_SIZE * KSTACK_PAGES) {
  464                         db_printf("Cached stack %p\n", ks_ce);
  465                         return;
  466                 }
  467         }
  468 }

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