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dfdd294a2a
* Makefile: Add rules to build and run tst-atfork2 test. * tst-atfork2.c: New file. * tst-atfork2mod.c: New file. * sysdeps/unix/sysv/linux/unregister-atfork.c (__unregister_atfork): Free the memory allocated for the handlers after removing them from the lists. * sysdeps/unix/sysv/linux/register-atfork.c: Define memeory cleanup function. * tst-atfork1.c (do_test): Wait for the child we forked. Report error in child. * sysdeps/unix/sysv/linux/fork.c (__libc_fork): Fix comment.
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* Copyright (C) 2002, 2003 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>, 2002.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <stdlib.h>
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#include "fork.h"
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int
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__register_atfork (prepare, parent, child, dso_handle)
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void (*prepare) (void);
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void (*parent) (void);
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void (*child) (void);
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void *dso_handle;
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{
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struct fork_handler *new_prepare = NULL;
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struct fork_handler *new_parent = NULL;
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struct fork_handler *new_child = NULL;
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if (prepare != NULL)
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{
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new_prepare = (struct fork_handler *) malloc (sizeof (*new_prepare));
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if (new_prepare == NULL)
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goto out1;
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new_prepare->handler = prepare;
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new_prepare->dso_handle = dso_handle;
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}
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if (parent != NULL)
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{
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new_parent = (struct fork_handler *) malloc (sizeof (*new_parent));
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if (new_parent == NULL)
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goto out2;
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new_parent->handler = parent;
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new_parent->dso_handle = dso_handle;
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}
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if (child != NULL)
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{
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new_child = (struct fork_handler *) malloc (sizeof (*new_child));
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if (new_child == NULL)
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{
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free (new_parent);
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out2:
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free (new_prepare);
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out1:
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return errno;
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}
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new_child->handler = child;
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new_child->dso_handle = dso_handle;
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}
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/* Get the lock to not conflict with running forks. */
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lll_lock (__fork_lock);
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/* Now that we have all the handlers allocate enqueue them. */
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if (new_prepare != NULL)
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list_add_tail (&new_prepare->list, &__fork_prepare_list);
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if (new_parent != NULL)
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list_add_tail (&new_parent->list, &__fork_parent_list);
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if (new_child != NULL)
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list_add_tail (&new_child->list, &__fork_child_list);
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/* Release the lock. */
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lll_unlock (__fork_lock);
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return 0;
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}
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libc_hidden_def (__register_atfork)
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libc_freeres_fn (free_mem)
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{
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/* Get the lock to not conflict with running forks. */
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lll_lock (__fork_lock);
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list_t *runp;
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list_t *prevp;
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list_for_each_prev_safe (runp, prevp, &__fork_prepare_list)
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{
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list_del (runp);
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free (list_entry (runp, struct fork_handler, list));
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}
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list_for_each_prev_safe (runp, prevp, &__fork_parent_list)
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{
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list_del (runp);
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free (list_entry (runp, struct fork_handler, list));
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}
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list_for_each_prev_safe (runp, prevp, &__fork_child_list)
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{
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list_del (runp);
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free (list_entry (runp, struct fork_handler, list));
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}
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/* Release the lock. */
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lll_unlock (__fork_lock);
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}
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