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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
#include "apr.h"
#if APR_HAS_OTHER_CHILD
#include "misc.h"
#include "threadproc.h"
#include "fileio.h"
#ifdef HAVE_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if APR_HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef BEOS
#include <sys/socket.h> /* for fd_set definition! */
#endif
static apr_other_child_rec_t *other_children = NULL;
static apr_status_t other_child_cleanup(void *data)
{
apr_other_child_rec_t **pocr, *nocr;
for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
if ((*pocr)->data == data) {
nocr = (*pocr)->next;
(*(*pocr)->maintenance) (APR_OC_REASON_UNREGISTER, (*pocr)->data, -1);
*pocr = nocr;
/* XXX: um, well we've just wasted some space in pconf ? */
return APR_SUCCESS;
}
}
return APR_SUCCESS;
}
APR_DECLARE(void) apr_proc_other_child_register(apr_proc_t *pid,
void (*maintenance) (int reason, void *, int status),
void *data, apr_file_t *write_fd, apr_pool_t *p)
{
apr_other_child_rec_t *ocr;
ocr = apr_palloc(p, sizeof(*ocr));
ocr->p = p;
ocr->proc = pid;
ocr->maintenance = maintenance;
ocr->data = data;
if (write_fd == NULL) {
ocr->write_fd = (apr_os_file_t) -1;
}
else {
#ifdef WIN32
/* This should either go away as part of eliminating apr_proc_probe_writable_fds
* or write_fd should point to an apr_file_t
*/
ocr->write_fd = write_fd->filehand;
#else
ocr->write_fd = write_fd->filedes;
#endif
}
ocr->next = other_children;
other_children = ocr;
apr_pool_cleanup_register(p, ocr->data, other_child_cleanup,
apr_pool_cleanup_null);
}
APR_DECLARE(void) apr_proc_other_child_unregister(void *data)
{
apr_other_child_rec_t *cur;
cur = other_children;
while (cur) {
if (cur->data == data) {
break;
}
cur = cur->next;
}
/* segfault if this function called with invalid parm */
apr_pool_cleanup_kill(cur->p, cur->data, other_child_cleanup);
other_child_cleanup(data);
}
APR_DECLARE(apr_status_t) apr_proc_other_child_read(apr_proc_t *pid, int status)
{
apr_other_child_rec_t *ocr, *nocr;
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->proc->pid != pid->pid)
continue;
ocr->proc = NULL;
(*ocr->maintenance) (APR_OC_REASON_DEATH, ocr->data, status);
return 0;
}
return APR_CHILD_NOTDONE;
}
#ifdef WIN32
/*
* Run the list of Other Children and restart the ones that have died.
* ToDo: APR'ize this function so it will serve Unix and Win32.
* Not clear to me how to make the Win32 function behave exactly like
* the non-win32 branch. wgs
*/
APR_DECLARE(void) apr_proc_other_child_check(void)
{
apr_other_child_rec_t *ocr, *nocr;
apr_status_t rv;
/* Todo:
* Implement code to detect if a pipe is still alive on Windows.
*/
if (other_children == NULL)
return;
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->proc == NULL)
continue;
rv = WaitForSingleObject(ocr->proc->hproc, 0);
if (rv != WAIT_TIMEOUT) {
(*ocr->maintenance) (APR_OC_REASON_LOST, ocr->data, -1);
}
}
}
#else /* Win32 */
APR_DECLARE(void) apr_proc_other_child_check(void)
{
apr_other_child_rec_t *ocr, *nocr;
pid_t waitret;
int status;
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->proc == NULL)
continue;
waitret = waitpid(ocr->proc->pid, &status, WNOHANG);
if (waitret == ocr->proc->pid) {
ocr->proc = NULL;
(*ocr->maintenance) (APR_OC_REASON_DEATH, ocr->data, status);
}
else if (waitret == 0) {
(*ocr->maintenance) (APR_OC_REASON_RESTART, ocr->data, -1);
}
else if (waitret == -1) {
/* uh what the heck? they didn't call unregister? */
ocr->proc = NULL;
(*ocr->maintenance) (APR_OC_REASON_LOST, ocr->data, -1);
}
}
}
#endif
#endif /* APR_HAS_OTHER_CHILD */
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