다시 질문입니다...accetp시에

	while(1)
	{
		clilen = sizeof(clientaddr);

		_debug(_fl, " SIGNAL WAIT\n");
		rtn 	= sigwaitinfo(&set, &si);

		/*------------------------------------------------------*/
		/*	receive rts					*/
		/*------------------------------------------------------*/
		if(rtn = SIGRTMIN)
		{
			resockfd = si.si_fd;

			if(resockfd == sockfd)
			{
				_debug(_fl, "accept \n");
	
				clilen = sizeof(clientaddr);
			
				sockfd = accept(fd, (struct sockaddr *)&clientaddr, &clilen);
				if(sockfd < 0)
				{
					_debug(_fl, "Accept error\n");
					return -1;
				}
			
				_debug(_fl, "======== step 1 =========\n");
				setup_sigio(sockfd);
				_debug(_fl, "======== step 2 =========\n");
			}
			else
			{
				_debug(_fl, "==================== step 3 ==========\n");
				memset(&message, 0x00, SZ_MESSAGE);
				
				if(read(resockfd, &message, SZ_MESSAGE) <= 0)
				{
					_debug(_fl, "disconnect \n");
					continue;
				}

			
				_debug(_fl, "[%.2s][%.16s/%.10s][%c][%c]\n",
					message.option, message.user_id,
					message.user_name, message.user_sex,
					message.categorize1);
			}
		}
	}
	




/*-----------------------------------------------------------------------*/
/*	setting socket fd						 */
/*-----------------------------------------------------------------------*/
int	setup_sigio(int fd)
{
	if(fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) < 0)
	{
		_debug(_fl, "Couldn't setup nonblocking io %d\n", fd);
		return -1;
	}

	if(fcntl(fd, F_SETSIG, SIGRTMIN) < 0)
	{
		_debug(_fl, "Couldn't set signal %d on %d\n", SIGRTMIN, fd);
		return -1;
	}   

	/*----------------------------------------------*/
	/* overflow에 대비하여 				*/
	/* socket 하나당 대기열에 하나만 들어갈수 있도록*/
	/*----------------------------------------------*/
	if(fcntl(fd, F_SETAUXFL, O_ONESIGFD) < 0)
	{
		_debug(_fl, "Couldn't set one signal\n");
		return -1;
	}

	if(fcntl(fd, F_SETOWN, getpid()) < 0)
	{
		_debug(_fl, "Couldn't set owner %d on %d\n", getpid(), fd);
		return -1;
	}

	return 0;
}

클라이언트 소스입니다.

/*-----------------------------------------------------------------------*/
/* File 	: test_client.c						 */
/* Name 	: Lee Moon Sun						 */
/* Date		: 2004. 04. 21						 */
/*-----------------------------------------------------------------------*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>

#include <map>
#include <vector>

using namespace std;

#include "../../include/damo_header.h"

int main(int argc, char **argv)
{
    int sockfd;
    int clilen;
    int state, i=0;
    char buff[20];

    struct sockaddr_in 	serveraddr;
    struct MESSAGE 	message;

    if(argc < 2)
    {
    	printf("usage : ./demo_client [port]\n");
	exit(1);
    }

    _opendebug("damo_chat");

    clilen = sizeof(serveraddr);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
    {
        perror("socket error : ");
        exit(0);
    }

    bzero(&serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serveraddr.sin_port = htons(atoi(argv[1]));

    if(connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0)
    {
    	_debug(_fl, " connect error[%d]\n", errno);
	exit(1);
    }

    memset(&message, 0x00, SZ_MESSAGE);
    memcpy(message.option, "02", 2);
    memcpy(message.user_id, "yurina", 6);
    memcpy(message.user_name, "이문선", 6);
    message.user_sex 	= 'F';
    message.secure_flag = 'I';
    message.categorize1 = '0';
    message.categorize2 = '1';
    message.room_num 	= 200;
    message.secret_flag = '1';
    strcpy(message.room_name, "문선이 방이당");
    message.max_num 	= 0;
    message.password	= 0;

    write(sockfd, &message, SZ_MESSAGE);
    memset(&buff, 0x00, sizeof(buff));
    read(sockfd, buff, sizeof(buff));
    _debug(_fl, "buff[%s]\n", buff);
    
    /*--------------------------------------*/

    memset(&message, 0x00, SZ_MESSAGE);
    memcpy(message.option, "03", 2);
    memcpy(message.user_id, "yurina99", 8);
    memcpy(message.user_name, "이문숙", 6);
    message.user_sex 	= 'F';
    message.secure_flag = 'I';
    message.categorize1 = '0';
    message.categorize2 = '1';
    message.room_num 	= 200;
    message.secret_flag = '1';
    strcpy(message.room_name, "문선이 방이당");
    message.max_num 	= 0;
    message.password	= 0;

    write(sockfd, &message, SZ_MESSAGE);
    memset(&buff, 0x00, sizeof(buff));
    read(sockfd, buff, sizeof(buff));
    _debug(_fl, "buff[%s]\n", buff);

    /*--------------------------------------*/
    /*
    memset(&message, 0x00, SZ_MESSAGE);
    memcpy(message.option, "02", 2);
    memcpy(message.user_id, "yurina00", 6);
    memcpy(message.user_name, "이문경", 6);
    message.user_sex = 'F';
    message.secure_flag = 'I';
    message.categorize1 = '0';

    write(sockfd, &message, SZ_MESSAGE);
    memset(&buff, 0x00, sizeof(buff));
    read(sockfd, buff, sizeof(buff));
    _debug(_fl, "buff[%s]\n", buff);
    */
    /*--------------------------------------*/

    close(sockfd);
    _closedebug();
}
/*-----------------------------------------------------------------------*/
/* End of Program							 */
/*-----------------------------------------------------------------------*/

위와 같이 RTS를 사용하여 프로그램을 만들었습니다.
client 에서 connect시에 accept하는 구문을 타고
write하면 else구문을 타는데..

<1078><00:05:20:460><main_process><99> SIGNAL WAIT
<1078><00:05:27:320><main_process><111> accept
<1078><00:05:27:320><main_process><331> ======== step 1 =========
<1078><00:05:27:320><main_process><333> ======== step 2 =========
<1078><00:05:27:320><main_process><99> SIGNAL WAIT

이렇게 accept만 타고..write시에 signal을 못받는건지..아니면 클라이언트의 이상인지..클라이언트는 종료하지 않고..멈춰있고 서버는 accept다음으로 넘어가지도 않습니다.
그러다가 클라이언트를 강제로 종료하면

<1078><00:05:20:460><main_process><99> SIGNAL WAIT
<1078><00:05:27:320><main_process><111> accept
<1078><00:05:27:320><main_process><331> ======== step 1 =========
<1078><00:05:27:320><main_process><333> ======== step 2 =========
<1078><00:05:27:320><main_process><99> SIGNAL WAIT
<1078><00:17:05:461><main_process><116> ==================== step 3 ==========
<1078><00:17:05:461><main_process><126> [02][yurina/이문선][F][0]
<1078><00:17:05:462><main_process><99> SIGNAL WAIT
<1078><00:17:05:462><main_process><116> ==================== step 3 ==========
<1078><00:17:05:462><main_process><121> disconnect
<1078><00:17:05:462><main_process><99> SIGNAL WAIT

이렇게 나머지 코딩이 실행됩니다...

왜 accept하고 블럭킹 되는걸까요...rts문제인가요?