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/*
* Copyright 2001-2004 Brandon Long
* All Rights Reserved.
*
* ClearSilver Templating System
*
* This code is made available under the terms of the ClearSilver License.
* http://www.clearsilver.net/license.hdf
*
*/
/* Initial version based on multi-proc based server (like apache 1.x)
*
* Parts are:
* 1) server Init
* 2) sub-proc start
* 3) sub-proc init
* 4) sub-proc process request
* 5) sub-proc cleanup
* 6) server cleanup
*
* Parts 1 & 6 aren't part of the framework, and at this point, I don't
* think I need to worry about 3 & 5 either, but maybe in the future.
*/
#include "cs_config.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <limits.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "neo_misc.h"
#include "neo_err.h"
#include "neo_net.h"
#include "ulocks.h"
#include "neo_server.h"
static NEOERR *nserver_child_loop(NSERVER *server, int num)
{
NEOERR *err = STATUS_OK, *clean_err;
int loop = 0;
NSOCK *child_sock;
if (server->init_cb)
{
err = server->init_cb(server->data, num);
if (err) return nerr_pass(err);
}
while (loop++ < server->num_requests)
{
err = fLock(server->accept_lock);
if (err) break;
err = ne_net_accept(&child_sock, server->server_fd, server->data_timeout);
fUnlock(server->accept_lock);
if (err) break;
err = server->req_cb(server->data, num, child_sock);
if (err)
{
ne_net_close(&child_sock);
}
else
{
err = ne_net_close(&child_sock);
}
nerr_log_error(err);
nerr_ignore(&err);
}
ne_warn("nserver child loop handled %d connections", loop-1);
if (server->clean_cb)
{
clean_err = server->clean_cb(server->data, num);
if (clean_err)
{
nerr_log_error(clean_err);
nerr_ignore(&clean_err);
}
}
return nerr_pass(err);
}
static void ignore_pipe(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGPIPE, &sa, NULL);
}
/* Handle shutdown by accepting a TERM signal and then passing it to our
* program group */
static int ShutdownPending = 0;
static void sig_term(int sig)
{
ShutdownPending = 1;
ne_net_shutdown();
}
static void setup_term(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = sig_term;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGTERM, &sa, NULL);
}
NEOERR *nserver_proc_start(NSERVER *server, BOOL debug)
{
NEOERR *err;
if (server->req_cb == NULL)
return nerr_raise(NERR_ASSERT, "nserver requires a request callback");
ignore_pipe();
setup_term();
ShutdownPending = 0;
err = fFind(&(server->accept_lock), server->lockfile);
if (err && nerr_handle(&err, NERR_NOT_FOUND))
{
err = fCreate(&(server->accept_lock), server->lockfile);
}
if (err) return nerr_pass(err);
do
{
err = ne_net_listen(server->port, &(server->server_fd));
if (err) break;
if (debug == TRUE)
{
err = nserver_child_loop(server, 0);
break;
}
else
{
/* create children and restart them as necessary */
pid_t child;
int count, status;
for (count = 0; count < server->num_children; count++)
{
child = fork();
if (child == -1)
{
err = nerr_raise_errno(NERR_SYSTEM, "Unable to fork child");
break;
}
if (!child)
{
err = nserver_child_loop(server, count);
if (err) exit(-1);
exit(0);
}
ne_warn("Starting child pid %d", child);
}
if (count < server->num_children) break;
while (!ShutdownPending)
{
child = wait3(&status, 0, NULL);
if (child == -1)
{
ne_warn("wait3 failed [%d] %s", errno, strerror(errno));
continue;
}
if (WIFSTOPPED(status))
{
ne_warn("pid %d stopped on signal %d", child, WSTOPSIG(status));
continue;
}
if (WIFEXITED(status))
{
/* at some point, we might do something here with the
* particular exit value */
ne_warn("pid %d exited, returned %d", child, WEXITSTATUS(status));
}
else if (WIFSIGNALED(status))
{
ne_warn("pid %d exited on signal %d", child, WTERMSIG(status));
}
count++;
child = fork();
if (child == -1)
{
err = nerr_raise_errno(NERR_SYSTEM, "Unable to fork child");
break;
}
if (!child)
{
err = nserver_child_loop(server, count);
if (err) exit(-1);
exit(0);
}
ne_warn("Starting child pid %d", child);
}
/* At some point, we might want to actually maintain information
* on our children, and then we can be more specific here in terms
* of making sure they all shutdown... for now, fergitaboutit */
if (ShutdownPending)
{
killpg(0, SIGTERM);
}
}
}
while (0);
fDestroy(server->accept_lock);
return nerr_pass(err);
}
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