How do you configure a socket in the kernel to be nonblocking or a timeout on an accept() call?

Unfortunately, the term "socket" is used to refer to several different things. The one in user space (that is referred to through an open file description with a small integer value) has a state you can set with fcntl . The one in kernel space (a pointer to the actual connection endpoint) doesn't.

Passing O_NONBLOCK to the accept or connect handlers only makes that particular accept or connect operation non-blocking.

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