SCTP接收消息功能返回零 [英] SCTP receive message function returning zero

问题描述

我编写的客户端程序使用SCTP套接字进行通信.我正在使用sctp_recvmsg从套接字读取特定用户可用的数据.我注意到，有时sctp_recvmsg返回0值而不是读取的字节数或-1表示错误.我检查了我的代码，读取数据的套接字没有关闭.有人可以阐明如何看待这种行为吗?

The client program i have written uses SCTP sockets for communication. I am using sctp_recvmsg to read the data available for a particular user from socket. I have noticed that at times sctp_recvmsg returns 0 value instead of number of bytes read or -1 indicating an error. I have checked my code and the socket from which data is being read is not closed. Can someone throw light on how can such a behavior be seen?

预先感谢.

关于， Sujay

推荐答案

根据此lksctp线程，如果您处于一对一的SCP连接(

According to this lksctp thread, sctp_recvmsg() returns 0 if the other side closed the connection when you are in a 1-to-1 SCP connection (see here for an explanation of one-to-one and one-to-many connections) - that is, when you create the socket with SOCK_STREAM instead of SOCK_SEQPACKET.

报价:

未记录来自sctp_sendmsg和sctp_recvmsg的返回值，但 我想sctp_sendmsg将返回-1并将errno设置为ECONNRESET 和sendmsg一样.但是，sctp_recvnmsg呢?清楚的 如果关闭半连接，则recvmsg应该返回0，但是没有 SCTP中的半连接.该函数的行为如何?

Return values from sctp_sendmsg and sctp_recvmsg are not documented, but I would suppose sctp_sendmsg would return -1 and set errno to ECONNRESET same way as sendmsg does. However, what about sctp_recvnmsg? Plain recvmsg should return 0 if half-connection is closed, but there are no half-connections in SCTP. How does the function behave exactly?

sctp_recvmsg()在终止时仅在1对1套接字上将返回0. 但是，以上通知在两种样式上均适用.

The sctp_recvmsg() will return 0 on termination only on 1-to-1 sockets. However, the above notifications will work on both styles.

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