efdfb8fea3
Don't attempt to follow null pointers for zombie processes in db_ps(). Style fix: use explicit an comparison with NULL for all null pointer checks in db_ps() instead of for half of them. db_interface.c: Fixed ddb's handling of traps from with ddb on i386's only. This was mostly fixed in rev.1.27 (by longjmp()'ing back to the top level) but was completly broken in rev.1.48 (by not unwinding the new state (mainly db_active) either before or after the longjmp(). This mostly never worked for other arches, since rev.1.27 has not been ported and lower level longjmp()'s only handle traps for memory accesses. All cases should be handled at a lower level to provided better control and simplify unwinding of state. Implementation details: don't pretend to maintain db_active in a nested way -- ddb cannot be reentered in a nested way. Use db_active instead of the db_global_jmpbuf_valid flag and longjmp()'s return value for things related to reentering ddb. [re]entering is still not atomic enough.
162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/cons.h>
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#include <ddb/ddb.h>
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void
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db_ps(dummy1, dummy2, dummy3, dummy4)
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db_expr_t dummy1;
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boolean_t dummy2;
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db_expr_t dummy3;
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char * dummy4;
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{
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int np;
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int nl = 0;
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volatile struct proc *p, *pp;
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volatile struct thread *td;
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char *state;
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np = nprocs;
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/* sx_slock(&allproc_lock); */
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if (!LIST_EMPTY(&allproc))
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p = LIST_FIRST(&allproc);
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else
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p = &proc0;
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db_printf(" pid proc addr uid ppid pgrp flag stat wmesg wchan cmd\n");
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while (--np >= 0) {
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/*
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* XXX just take 20 for now...
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*/
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if (nl++ == 20) {
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int c;
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db_printf("--More--");
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c = cngetc();
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db_printf("\r");
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/*
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* A whole screenfull or just one line?
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*/
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switch (c) {
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case '\n': /* just one line */
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nl = 20;
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break;
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case ' ':
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nl = 0; /* another screenfull */
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break;
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default: /* exit */
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db_printf("\n");
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return;
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}
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}
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if (p == NULL) {
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printf("oops, ran out of processes early!\n");
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break;
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}
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/* PROC_LOCK(p); */
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pp = p->p_pptr;
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if (pp == NULL)
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pp = p;
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switch(p->p_state) {
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case PRS_NORMAL:
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if (P_SHOULDSTOP(p))
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state = "stop";
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else
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state = "norm";
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break;
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case PRS_NEW:
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state = "new ";
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break;
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case PRS_WAIT:
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state = "wait";
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break;
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case PRS_ZOMBIE:
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state = "zomp";
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break;
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default:
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state = "Unkn";
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break;
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}
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db_printf("%5d %8p %8p %4d %5d %5d %07x %-4s",
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p->p_pid, (volatile void *)p, (void *)p->p_uarea,
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p->p_ucred != NULL ? p->p_ucred->cr_ruid : 0, pp->p_pid,
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p->p_pgrp != NULL ? p->p_pgrp->pg_id : 0, p->p_flag,
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state);
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if (p->p_flag & P_KSES) {
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db_printf("(threaded) %s\n", p->p_comm);
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FOREACH_THREAD_IN_PROC(p, td) {
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db_printf( ". . . . . . . "
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". thread %p . . . ", td);
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if (td->td_wchan != NULL) {
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db_printf("SLP %6s %8p\n", td->td_wmesg,
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(void *)td->td_wchan);
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} else if (td->td_state == TDS_MTX) {
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db_printf("MTX %6s %8p\n", td->td_mtxname,
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(void *)td->td_blocked);
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} else {
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db_printf("--not blocked--\n");
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}
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}
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} else {
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td = FIRST_THREAD_IN_PROC(p);
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if (td != NULL && td->td_wchan != NULL) {
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db_printf(" %-6s %8p", td->td_wmesg,
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(void *)td->td_wchan);
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} else if (td != NULL && td->td_state == TDS_MTX) {
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db_printf(" %6s %8p", td->td_mtxname,
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(void *)td->td_blocked);
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} else {
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db_printf(" ");
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}
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db_printf(" %s\n", p->p_comm);
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}
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/* PROC_UNLOCK(p); */
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p = LIST_NEXT(p, p_list);
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if (p == NULL && np > 0)
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p = LIST_FIRST(&zombproc);
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}
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/* sx_sunlock(&allproc_lock); */
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}
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