SIGPIPE，破管

问题描述：

我正在使用epoll在linux机器上的网络程序，我得到了来自gdb的错误消息。

I am working on a networking program using epoll on linux machine and I got the error message from gdb.

Program received signal SIGPIPE, Broken pipe.
[Switching to Thread 0x7ffff609a700 (LWP 19788)]
0x00007ffff7bcdb2d in write () from /lib/libpthread.so.0
(gdb)
(gdb) backtrace
#0  0x00007ffff7bcdb2d in write () from /lib/libpthread.so.0
#1  0x0000000000416bc8 in WorkHandler::workLoop() ()
#2  0x0000000000416920 in WorkHandler::runWorkThread(void*) ()
#3  0x00007ffff7bc6971 in start_thread () from /lib/libpthread.so.0
#4  0x00007ffff718392d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

我的服务器做n ^ 2次计算，我试图运行500个连接用户。什么原因可能导致此错误？如何解决这个问题？

My server doing n^2 time calculation and I tried to run the server with 500 connected users. What might cause this error? and how do I fix this?

       while(1){
            if(remainLength >= MAX_LENGTH)
                currentSentLength = write(client->getFd(), sBuffer, MAX_LENGTH);
            else
                currentSentLength = write(client->getFd(), sBuffer, remainLength);


            if(currentSentLength == -1){
                log("WorkHandler::workLoop, connection has been lost \n");
                break;
            }
            sBuffer += currentSentLength;
            remainLength -= currentSentLength;

            if(remainLength == 0)
                break;
        }

答

已经关闭（由远程端），您的程序将接收此信号。对于简单的命令行过滤程序，这通常是一个适当的默认操作，因为SIGPIPE的默认处理程序将终止程序。

When you write to a pipe that has been closed (by the remote end) , your program will receive this signal. For simple command-line filter programs, this is often an appropriate default action, since the default handler for SIGPIPE will terminate the program.

对于多线程程序，通常是忽略SIGPIPE信号，因此写入关闭的套接字不会终止程序。

For a multithreaded program, the correct action is usually to ignore the SIGPIPE signal, so that writing to a closed socket will not terminate the program.

请注意，您在写入之前成功执行检查，因为远程端可能会在您的检查和对 write（）的调用之间关闭套接字。

Note that you cannot successfully perform a check before writing, since the remote end may close the socket in between your check and your call to write().

有关忽略SIGPIPE的更多信息，请参阅此问题：如何防止SIGPIPE（或正确处理它们）。

See this question for more information on ignoring SIGPIPE: How to prevent SIGPIPEs (or handle them properly).

SIGPIPE，破管

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