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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* Validate a thread handle.
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Copyright (C) 1999,2001,2002,2003,2004,2007,2008
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "thread_dbP.h"
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#include <stdbool.h>
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static td_err_e
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check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
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{
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td_err_e err;
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psaddr_t next, ofs;
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err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
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if (err == TD_OK)
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{
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if (next == 0)
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{
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*uninit = true;
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return TD_NOTHR;
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}
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err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
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}
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while (err == TD_OK)
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{
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if (next == head)
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return TD_NOTHR;
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if (next - (ofs - (psaddr_t) 0) == th->th_unique)
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return TD_OK;
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err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
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}
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return err;
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}
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td_err_e
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td_thr_validate (const td_thrhandle_t *th)
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{
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td_err_e err;
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psaddr_t list;
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LOG ("td_thr_validate");
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/* First check the list with threads using user allocated stacks. */
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bool uninit = false;
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err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
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if (err == TD_OK)
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err = check_thread_list (th, list, &uninit);
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/* If our thread is not on this list search the list with stack
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using implementation allocated stacks. */
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if (err == TD_NOTHR)
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{
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err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
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if (err == TD_OK)
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err = check_thread_list (th, list, &uninit);
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if (err == TD_NOTHR && uninit && th->th_unique == 0)
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/* __pthread_initialize_minimal has not run yet.
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There is only the special case thread handle. */
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err = TD_OK;
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}
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if (err == TD_OK)
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{
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/* Verify that this is not a stale element in a fork child. */
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pid_t match_pid = ps_getpid (th->th_ta_p->ph);
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psaddr_t pid;
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err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique, pthread, pid, 0);
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if (err == TD_OK && (pid_t) (uintptr_t) pid < 0)
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{
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/* This was a thread that was about to fork, or it is the new sole
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thread in a fork child. In the latter case, its tid was stored
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via CLONE_CHILD_SETTID and so is already the proper child PID. */
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if (-(pid_t) (uintptr_t) pid == match_pid)
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/* It is about to do a fork, but is really still the parent PID. */
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pid = (psaddr_t) (uintptr_t) match_pid;
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else
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/* It must be a fork child, whose new PID is in the tid field. */
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err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique,
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pthread, tid, 0);
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}
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if (err == TD_OK && (pid_t) (uintptr_t) pid != match_pid)
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err = TD_NOTHR;
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}
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return err;
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}
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