intro/daytimetcpcli.c

#include    "unp.h"

int

main(int argc, char **argv)

{

    int                    sockfd, n;

    char                recvline[MAXLINE + ];

    struct sockaddr_in    servaddr;

    if (argc != )

        err_quit("usage: a.out <IPaddress>");

    if ( (sockfd = socket(AF_INET, SOCK_STREAM, )) < )

        err_sys("socket error");

    bzero(&servaddr, sizeof(servaddr));

    servaddr.sin_family = AF_INET;

    servaddr.sin_port   = htons();    /* daytime server */

    if (inet_pton(AF_INET, argv[], &servaddr.sin_addr) <= )

        err_quit("inet_pton error for %s", argv[]);

    if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < )

        err_sys("connect error");

    while ( (n = read(sockfd, recvline, MAXLINE)) > ) {

        recvline[n] = ;    /* null terminate */

        if (fputs(recvline, stdout) == EOF)

            err_sys("fputs error");

    }

    if (n < )

        err_sys("read error");

    exit();

}

intro/daytimetcpsrv.c

#include    "unp.h"

#include    <time.h>

int

main(int argc, char **argv)

{

    int                    listenfd, connfd;

    struct sockaddr_in    servaddr;

    char                buff[MAXLINE];

    time_t                ticks;

    listenfd = Socket(AF_INET, SOCK_STREAM, );

    bzero(&servaddr, sizeof(servaddr));

    servaddr.sin_family      = AF_INET;

    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    servaddr.sin_port        = htons();    /* daytime server */

    Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));

    Listen(listenfd, LISTENQ);

    for ( ; ; ) {

        connfd = Accept(listenfd, (SA *) NULL, NULL);

        ticks = time(NULL);

        snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));

        Write(connfd, buff, strlen(buff));

        Close(connfd);

    }

}

dzhwen@deng:~/unpv13e/intro$ gcc -w daytimetcpsrv.c ../lib/wrapsock.c ../lib/error.c ../lib/wrapunix.c -o testsrv

dzhwen@deng:~/unpv13e/intro$ gcc -w daytimetcpcli.c ../lib/error.c -o test

dzhwen@deng:~/unpv13e/intro$ ./testsrv

dzhwen@deng:~/unpv13e/intro$ ./test 127.1.1.1

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