检查连接打开或关闭？（在Linux下C） [英] Check connection open or closed ?(in C in Linux)

问题描述

在socket编程在Linux中我需要写在插座数据，但我不知道插座是打开或关闭。怎么我知道插座是启闭无读？

In socket programming in Linux I need to write data in socket but I don't know socket is open or close . how to I know that socket is open and close without read ?

printf("befor read%d\n", n);
bzero(buffer, MAX_SIZE_BUFFER);
n = read(sockfd, buffer, MAX_SIZE_BUFFER - 1);
printf("after read%d\n", n);
if (n <= 0)
{
    break;
}
printf("befor write%d, s: %d \n", n , sockfd);

n = write(newsockfd, buffer, n);
if (n <= 0)
{
    break;
}

我的sockfd从阅读，我确信这一点上是开放的。当在newsockfd写缓冲区我不知道newsockfd是打开或关闭如何检查newsockfd关闭？

I read from sockfd and I sure this connection is open . When to write buffer in newsockfd I don't know newsockfd is open or close how to check newsockfd is closed ?

---

我知道的问题。以书面形式连接的中间关闭。例如写1024个数据500连接关闭，程序关闭。如何避免这种情况？

I know problem . in middle of writing connection closed . for example write 1024 data in 500 connection closed and program closed. how to avoid this ?

推荐答案

我使用send（），而不是写（）办理无信号：

I use send() instead write() that handle no signal :

bzero(buffer, MAX_SIZE_BUFFER);
n = read(sockfd, buffer, MAX_SIZE_BUFFER - 1);
printf("after read%d\n", n);
if (n <= 0)
{
    break;
}
n2 = send(newsockfd, buffer, n, MSG_NOSIGNAL);
if (n2 == -1)
{
    close(sockfd);
    close(newsockfd);
    return;
}
if (n2 != n)
{
    break;
}

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