TCP server有关缓冲区的问题

2018-12-23 11:47:22 172 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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//server.cpp
出问题的一段：

printf("==========waiting for client's request==========\n");

    if ((acceptfd = accept(listenfd, (struct sockaddr*)NULL, NULL)) == -1) {

        printf("accept socket error: %s(errno: %d)\n", strerror(errno), errno);

    }

    else

    {

        printf("accept sucess\n");

        int rcvbuf_len = 0;

        socklen_t len = sizeof(rcvbuf_len);

        if (getsockopt(acceptfd, SOL_SOCKET, SO_RCVBUF, &rcvbuf_len, &len) < 0) {

            perror("getsockopt: ");

        }

        printf("the recv buf len: %d\n", rcvbuf_len);

    }

    char recvmsg[246988] = {0};

    ssize_t totallen = 0;

    while (1) {

        sleep(1);

        ssize_t readlen = read(acceptfd, recvmsg, sizeof(recvmsg));

        printf("readLen: %d\n", readlen);

        if (readlen < 0) {

            perror("read: ");

            return -1;

        }

        else if (readlen == 0) {

            printf("read finish: len = % ld\n", totallen);

            close(acceptfd);

            return 0;

        }

        else

        {

            totallen += readlen;

        }

    }

//client.cpp
客户端向服务端发送4个包，每个包中发送246988Byte：

ssize_t writelen;

    char sendmsg[246988] = {0};

    int count = 0;

    while (1)

    {

        ++count;

        if (count == 5) {

            return 0;

        }

        writelen = write(connfd, sendmsg, sizeof(sendmsg));

        if (writelen < 0) {

            printf("write error\n");

            close(connfd);

            return 0;

        }

        else

        {

            printf("write success, writelen: %d\n", writelen);

        }

    }