#include    "unp.h"##  1 ##src/tcpcliserv/tcpserv04.c##

int##  2 ##src/tcpcliserv/tcpserv04.c##
main(int argc, char **argv)##  3 ##src/tcpcliserv/tcpserv04.c##
{##  4 ##src/tcpcliserv/tcpserv04.c##
    int     listenfd, connfd;##  5 ##src/tcpcliserv/tcpserv04.c##
    pid_t   childpid;##  6 ##src/tcpcliserv/tcpserv04.c##
    socklen_t clilen;##  7 ##src/tcpcliserv/tcpserv04.c##
    struct sockaddr_in cliaddr, servaddr;##  8 ##src/tcpcliserv/tcpserv04.c##
    void    sig_chld(int);##  9 ##src/tcpcliserv/tcpserv04.c##

    listenfd = Socket(AF_INET, SOCK_STREAM, 0);## 10 ##src/tcpcliserv/tcpserv04.c##

    bzero(&servaddr, sizeof(servaddr));## 11 ##src/tcpcliserv/tcpserv04.c##
    servaddr.sin_family = AF_INET;## 12 ##src/tcpcliserv/tcpserv04.c##
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);## 13 ##src/tcpcliserv/tcpserv04.c##
    servaddr.sin_port = htons(SERV_PORT);## 14 ##src/tcpcliserv/tcpserv04.c##

    Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));## 15 ##src/tcpcliserv/tcpserv04.c##

    Listen(listenfd, LISTENQ);## 16 ##src/tcpcliserv/tcpserv04.c##

    Signal(SIGCHLD, sig_chld);  /* must call waitpid() */## 17 ##src/tcpcliserv/tcpserv04.c##

    for (;;) {## 18 ##src/tcpcliserv/tcpserv04.c##
        clilen = sizeof(cliaddr);## 19 ##src/tcpcliserv/tcpserv04.c##
        if ((connfd = accept(listenfd, (SA *) &cliaddr, &clilen)) < 0) {## 20 ##src/tcpcliserv/tcpserv04.c##
            if (errno == EINTR)## 21 ##src/tcpcliserv/tcpserv04.c##
                continue;       /* back to for() */## 22 ##src/tcpcliserv/tcpserv04.c##
            else## 23 ##src/tcpcliserv/tcpserv04.c##
                err_sys("accept error");## 24 ##src/tcpcliserv/tcpserv04.c##
        }## 25 ##src/tcpcliserv/tcpserv04.c##

        if ((childpid = Fork()) == 0) { /* child process */## 26 ##src/tcpcliserv/tcpserv04.c##
            Close(listenfd);    /* close listening socket */## 27 ##src/tcpcliserv/tcpserv04.c##
            str_echo(connfd);   /* process the request */## 28 ##src/tcpcliserv/tcpserv04.c##
            exit(0);## 29 ##src/tcpcliserv/tcpserv04.c##
        }## 30 ##src/tcpcliserv/tcpserv04.c##
        Close(connfd);          /* parent closes connected socket */## 31 ##src/tcpcliserv/tcpserv04.c##
    }## 32 ##src/tcpcliserv/tcpserv04.c##
}## 33 ##src/tcpcliserv/tcpserv04.c##