多进程的cgi_pool
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#define BUFFER_SIZE 1024
#define MAX_EVENT_NUMBER 1024
#define PROCESS_COUNT 5
#define USER_PER_PROCESS 65535
struct process_in_pool
{
pid_t pid;
int pipefd[2];
};
struct client_data
{
sockaddr_in address;
char buf[ BUFFER_SIZE ];
int read_idx;
};
int sig_pipefd[2];
int epollfd;
int listenfd;
process_in_pool sub_process[ PROCESS_COUNT ];
bool stop_child = false;
int setnonblocking( int fd )
{
int old_option = fcntl( fd, F_GETFL );
int new_option = old_option | O_NONBLOCK;
fcntl( fd, F_SETFL, new_option );
return old_option;
}
void addfd( int epollfd, int fd )
{
epoll_event event;
event.data.fd = fd;
event.events = EPOLLIN | EPOLLET;
epoll_ctl( epollfd, EPOLL_CTL_ADD, fd, &event );
setnonblocking( fd );
}
void sig_handler( int sig )
{
int save_errno = errno;
int msg = sig;
send( sig_pipefd[1], ( char* )&msg, 1, 0 );
errno = save_errno;
}
void addsig( int sig, void(*handler)(int), bool restart = true )
{
struct sigaction sa;
memset( &sa, '\0', sizeof( sa ) );
sa.sa_handler = handler;
if( restart )
{
sa.sa_flags |= SA_RESTART;
}
sigfillset( &sa.sa_mask );
assert( sigaction( sig, &sa, NULL ) != -1 );
}
void del_resource()
{
close( sig_pipefd[0] );
close( sig_pipefd[1] );
close( listenfd );
close( epollfd );
}
void child_term_handler( int sig )
{
stop_child = true;
}
void child_child_handler( int sig )
{
pid_t pid;
int stat;
while ( ( pid = waitpid( -1, &stat, WNOHANG ) ) > 0 )
{
continue;
}
}
int run_child( int idx )
{
epoll_event events[ MAX_EVENT_NUMBER ];
int child_epollfd = epoll_create( 5 );
assert( child_epollfd != -1 );
int pipefd = sub_process[idx].pipefd[1];
addfd( child_epollfd, pipefd );
int ret;
addsig( SIGTERM, child_term_handler, false );
addsig( SIGCHLD, child_child_handler );
client_data* users = new client_data[ USER_PER_PROCESS ];
while( !stop_child )
{
int number = epoll_wait( child_epollfd, events, MAX_EVENT_NUMBER, -1 );
if ( ( number < 0 ) && ( errno != EINTR ) )
{
printf( "epoll failure\n" );
break;
}
for ( int i = 0; i < number; i++ )
{
int sockfd = events[i].data.fd;
if( ( sockfd == pipefd ) && ( events[i].events & EPOLLIN ) )
{
int client = 0;
ret = recv( sockfd, ( char* )&client, sizeof( client ), 0 );
if( ret < 0 )
{
if( errno != EAGAIN )
{
stop_child = true;
}
}
else if( ret == 0 )
{
stop_child = true;
}
else
{
struct sockaddr_in client_address;
socklen_t client_addrlength = sizeof( client_address );
int connfd = accept( listenfd, ( struct sockaddr* )&client_address, &client_addrlength );
if ( connfd < 0 )
{
printf( "errno is: %d\n", errno );
continue;
}
memset( users[connfd].buf, '\0', BUFFER_SIZE );
users[connfd].address = client_address;
users[connfd].read_idx = 0;
addfd( child_epollfd, connfd );
}
}
else if( events[i].events & EPOLLIN )
{
int idx = 0;
while( true )
{
idx = users[sockfd].read_idx;
ret = recv( sockfd, users[sockfd].buf + idx, BUFFER_SIZE-1-idx, 0 );
if( ret < 0 )
{
if( errno != EAGAIN )
{
epoll_ctl( child_epollfd, EPOLL_CTL_DEL, sockfd, 0 );
close( sockfd );
}
break;
}
else if( ret == 0 )
{
epoll_ctl( child_epollfd, EPOLL_CTL_DEL, sockfd, 0 );
close( sockfd );
break;
}
else
{
users[sockfd].read_idx += ret;
printf( "user content is: %s\n", users[sockfd].buf + idx );
idx = users[sockfd].read_idx;
if( ( idx < 2 ) || ( users[sockfd].buf[idx-2] != '\r' ) || ( users[sockfd].buf[idx-1] != '\n' ) )
{
continue;
}
users[sockfd].buf[users[sockfd].read_idx-2] = '\0';
/*
char* file_name = users[sockfd].buf;
if( access( file_name, F_OK ) == -1 )
{
epoll_ctl( child_epollfd, EPOLL_CTL_DEL, sockfd, 0 );
close( sockfd );
break;
}
ret = fork();
if( ret == -1 )
{
epoll_ctl( child_epollfd, EPOLL_CTL_DEL, sockfd, 0 );
close( sockfd );
break;
}
else if( ret > 0 )
{
epoll_ctl( child_epollfd, EPOLL_CTL_DEL, sockfd, 0 );
close( sockfd );
break;
}
else
{
close( STDOUT_FILENO );
dup( sockfd );
execl( users[sockfd].buf, users[sockfd].buf, 0 );
exit( 0 );
}
*/
}
}
}
else
{
continue;
}
}
}
delete [] users;
close( pipefd );
close( child_epollfd );
return 0;
}
int main( int argc, char* argv[] )
{
if( argc <= 2 )
{
printf( "usage: %s ip_address port_number\n", basename( argv[0] ) );
return 1;
}
const char* ip = argv[1];
int port = atoi( argv[2] );
int ret = 0;
struct sockaddr_in address;
bzero( &address, sizeof( address ) );
address.sin_family = AF_INET;
inet_pton( AF_INET, ip, &address.sin_addr );
address.sin_port = htons( port );
listenfd = socket( PF_INET, SOCK_STREAM, 0 );
assert( listenfd >= 0 );
ret = bind( listenfd, ( struct sockaddr* )&address, sizeof( address ) );
assert( ret != -1 );
ret = listen( listenfd, 5 );
assert( ret != -1 );
for( int i = 0; i < PROCESS_COUNT; ++i )
{
ret = socketpair( PF_UNIX, SOCK_STREAM, 0, sub_process[i].pipefd );
assert( ret != -1 );
sub_process[i].pid = fork();
if( sub_process[i].pid < 0 )
{
continue;
}
else if( sub_process[i].pid > 0 )
{
close( sub_process[i].pipefd[1] );
setnonblocking( sub_process[i].pipefd[0] );
continue;
}
else
{
close( sub_process[i].pipefd[0] );
setnonblocking( sub_process[i].pipefd[1] );
run_child( i );
exit( 0 );
}
}
epoll_event events[ MAX_EVENT_NUMBER ];
epollfd = epoll_create( 5 );
assert( epollfd != -1 );
addfd( epollfd, listenfd );
ret = socketpair( PF_UNIX, SOCK_STREAM, 0, sig_pipefd );
assert( ret != -1 );
setnonblocking( sig_pipefd[1] );
addfd( epollfd, sig_pipefd[0] );
addsig( SIGCHLD, sig_handler );
addsig( SIGTERM, sig_handler );
addsig( SIGINT, sig_handler );
addsig( SIGPIPE, SIG_IGN );
bool stop_server = false;
int sub_process_counter = 0;
while( !stop_server )
{
int number = epoll_wait( epollfd, events, MAX_EVENT_NUMBER, -1 );
if ( ( number < 0 ) && ( errno != EINTR ) )
{
printf( "epoll failure\n" );
break;
}
for ( int i = 0; i < number; i++ )
{
int sockfd = events[i].data.fd;
if( sockfd == listenfd )
{
int new_conn = 1;
send( sub_process[sub_process_counter++].pipefd[0], ( char* )&new_conn, sizeof( new_conn ), 0 );
printf( "send request to child %d\n", sub_process_counter-1 );
sub_process_counter %= PROCESS_COUNT;
}
else if( ( sockfd == sig_pipefd[0] ) && ( events[i].events & EPOLLIN ) )
{
int sig;
char signals[1024];
ret = recv( sig_pipefd[0], signals, sizeof( signals ), 0 );
if( ret == -1 )
{
continue;
}
else if( ret == 0 )
{
continue;
}
else
{
for( int i = 0; i < ret; ++i )
{
switch( signals[i] )
{
case SIGCHLD:
{
pid_t pid;
int stat;
while ( ( pid = waitpid( -1, &stat, WNOHANG ) ) > 0 )
{
for( int i = 0; i < PROCESS_COUNT; ++i )
{
if( sub_process[i].pid == pid )
{
close( sub_process[i].pipefd[0] );
sub_process[i].pid = -1;
}
}
}
stop_server = true;
for( int i = 0; i < PROCESS_COUNT; ++i )
{
if( sub_process[i].pid != -1 )
{
stop_server = false;
}
}
break;
}
case SIGTERM:
case SIGINT:
{
printf( "kill all the clild now\n" );
for( int i = 0; i < PROCESS_COUNT; ++i )
{
int pid = sub_process[i].pid;
kill( pid, SIGTERM );
}
break;
}
default:
{
break;
}
}
}
}
}
else
{
continue;
}
}
}
del_resource();
return 0;
}
