select 详解
Posted mingzhang
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In summary, a socket will be identified in a particular set when select returns if:
readfds:
If listen has been called and a connection is pending, accept will succeed.
Data is available for reading (includes OOB data if SO_OOBINLINE is enabled).
Connection has been closed/reset/terminated.
writefds:
If processing a connect call (nonblocking), connection has succeeded.
Data can be sent.
exceptfds:
If processing a connect call (nonblocking), connection attempt failed.
OOB data is available for reading (only if SO_OOBINLINE is disabled).
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