哪些原因会导致袜子上发送“资源​​暂时不可用”（）命令 [英] What can cause a “Resource temporarily unavailable” on sock send() command

问题描述

什么能插座发送（）命令上引起资源暂时不可用错误？这个插座设置为 AF_UNIX，SOCK_STREAM 。它的工作原理的大部分时间，但偶尔得到这个错误。插座的接收端似乎正常工作。

What can cause a Resource temporarily unavailable error on a socket send() command? The socket is setup as AF_UNIX, SOCK_STREAM. It works most of the time, but occasionally gets this error. The receiving end of the socket appears to be working properly.

我知道这是不是很详细，但我只是在寻找总体思路。谢谢！

I know this isn't very detailed, but I'm just looking for general ideas. Thanks!

推荐答案

资源暂时不可用是对应于该错误信息 EAGAIN ，这意味着操作会阻止，但被要求非阻塞操作。对于发送（），这可能是由于任何的：

"Resource temporarily unavailable" is the error message corresponding to EAGAIN, which means that the operation would have blocked but nonblocking operation was requested. For send(), that could be due to any of:

• 标记明确的文件描述符为非阻塞与的fcntl（）;或


• 通过了 MSG_DONTWAIT 标志发送（）;或


• 设置为 SO_SNDTIMEO 套接字选项一个发送超时。

• explicitly marking the file descriptor as nonblocking with fcntl(); or
• passing the MSG_DONTWAIT flag to send(); or
• setting a send timeout with the SO_SNDTIMEO socket option.

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