tcpservselect01.lc

unix network ,unix network unix network

/* include fig01 */
#include    "unp.h"##  1 ##src/tcpcliserv/tcpservselect01.c##

int##  2 ##src/tcpcliserv/tcpservselect01.c##
main(int argc, char **argv)##  3 ##src/tcpcliserv/tcpservselect01.c##
{##  4 ##src/tcpcliserv/tcpservselect01.c##
    int     i, maxi, maxfd, listenfd, connfd, sockfd;##  5 ##src/tcpcliserv/tcpservselect01.c##
    int     nready, client[FD_SETSIZE];##  6 ##src/tcpcliserv/tcpservselect01.c##
    ssize_t n;##  7 ##src/tcpcliserv/tcpservselect01.c##
    fd_set  rset, allset;##  8 ##src/tcpcliserv/tcpservselect01.c##
    char    line[MAXLINE];##  9 ##src/tcpcliserv/tcpservselect01.c##
    socklen_t clilen;## 10 ##src/tcpcliserv/tcpservselect01.c##
    struct sockaddr_in cliaddr, servaddr;## 11 ##src/tcpcliserv/tcpservselect01.c##

    listenfd = Socket(AF_INET, SOCK_STREAM, 0);## 12 ##src/tcpcliserv/tcpservselect01.c##

    bzero(&servaddr, sizeof(servaddr));## 13 ##src/tcpcliserv/tcpservselect01.c##
    servaddr.sin_family = AF_INET;## 14 ##src/tcpcliserv/tcpservselect01.c##
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);## 15 ##src/tcpcliserv/tcpservselect01.c##
    servaddr.sin_port = htons(SERV_PORT);## 16 ##src/tcpcliserv/tcpservselect01.c##

    Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));## 17 ##src/tcpcliserv/tcpservselect01.c##

    Listen(listenfd, LISTENQ);## 18 ##src/tcpcliserv/tcpservselect01.c##

    maxfd = listenfd;           /* initialize */## 19 ##src/tcpcliserv/tcpservselect01.c##
    maxi = -1;                  /* index into client[] array */## 20 ##src/tcpcliserv/tcpservselect01.c##
    for (i = 0; i < FD_SETSIZE; i++)## 21 ##src/tcpcliserv/tcpservselect01.c##
        client[i] = -1;         /* -1 indicates available entry */## 22 ##src/tcpcliserv/tcpservselect01.c##
    FD_ZERO(&allset);## 23 ##src/tcpcliserv/tcpservselect01.c##
    FD_SET(listenfd, &allset);## 24 ##src/tcpcliserv/tcpservselect01.c##
/* end fig01 */

/* include fig02 */
    for (;;) {## 25 ##src/tcpcliserv/tcpservselect01.c##
        rset = allset;          /* structure assignment */## 26 ##src/tcpcliserv/tcpservselect01.c##
        nready = Select(maxfd + 1, &rset, NULL, NULL, NULL);## 27 ##src/tcpcliserv/tcpservselect01.c##

        if (FD_ISSET(listenfd, &rset)) {    /* new client connection */## 28 ##src/tcpcliserv/tcpservselect01.c##
            clilen = sizeof(cliaddr);## 29 ##src/tcpcliserv/tcpservselect01.c##
            connfd = Accept(listenfd, (SA *) &cliaddr, &clilen);## 30 ##src/tcpcliserv/tcpservselect01.c##

            for (i = 0; i < FD_SETSIZE; i++)## 31 ##src/tcpcliserv/tcpservselect01.c##
                if (client[i] < 0) {## 32 ##src/tcpcliserv/tcpservselect01.c##
                    client[i] = connfd; /* save descriptor */## 33 ##src/tcpcliserv/tcpservselect01.c##
                    break;## 34 ##src/tcpcliserv/tcpservselect01.c##
                }## 35 ##src/tcpcliserv/tcpservselect01.c##
            if (i == FD_SETSIZE)## 36 ##src/tcpcliserv/tcpservselect01.c##
                err_quit("too many clients");## 37 ##src/tcpcliserv/tcpservselect01.c##

            FD_SET(connfd, &allset);    /* add new descriptor to set */## 38 ##src/tcpcliserv/tcpservselect01.c##
            if (connfd > maxfd)## 39 ##src/tcpcliserv/tcpservselect01.c##
                maxfd = connfd; /* for select */## 40 ##src/tcpcliserv/tcpservselect01.c##
            if (i > maxi)## 41 ##src/tcpcliserv/tcpservselect01.c##
                maxi = i;       /* max index in client[] array */## 42 ##src/tcpcliserv/tcpservselect01.c##

            if (--nready <= 0)## 43 ##src/tcpcliserv/tcpservselect01.c##
                continue;       /* no more readable descriptors */## 44 ##src/tcpcliserv/tcpservselect01.c##
        }## 45 ##src/tcpcliserv/tcpservselect01.c##

        for (i = 0; i <= maxi; i++) {   /* check all clients for data */## 46 ##src/tcpcliserv/tcpservselect01.c##
            if ((sockfd = client[i]) < 0)## 47 ##src/tcpcliserv/tcpservselect01.c##
                continue;## 48 ##src/tcpcliserv/tcpservselect01.c##
            if (FD_ISSET(sockfd, &rset)) {## 49 ##src/tcpcliserv/tcpservselect01.c##
                if ((n = Readline(sockfd, line, MAXLINE)) == 0) {## 50 ##src/tcpcliserv/tcpservselect01.c##
                    /* 4connection closed by client */## 51 ##src/tcpcliserv/tcpservselect01.c##
                    Close(sockfd);## 52 ##src/tcpcliserv/tcpservselect01.c##
                    FD_CLR(sockfd, &allset);## 53 ##src/tcpcliserv/tcpservselect01.c##
                    client[i] = -1;## 54 ##src/tcpcliserv/tcpservselect01.c##
                } else## 55 ##src/tcpcliserv/tcpservselect01.c##
                    Writen(sockfd, line, n);## 56 ##src/tcpcliserv/tcpservselect01.c##

                if (--nready <= 0)## 57 ##src/tcpcliserv/tcpservselect01.c##
                    break;      /* no more readable descriptors */## 58 ##src/tcpcliserv/tcpservselect01.c##
            }## 59 ##src/tcpcliserv/tcpservselect01.c##
        }## 60 ##src/tcpcliserv/tcpservselect01.c##
    }## 61 ##src/tcpcliserv/tcpservselect01.c##
}## 62 ##src/tcpcliserv/tcpservselect01.c##
/* end fig02 */