Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

close(2) OSS System Calls Reference Manual
• The socket has untransmitted data.
the close() function does not block. The system attempts to deliver unsent data after the close()
function is called, although that action can be disabled. See the setsockopt(2) reference page for
additional information.
HP extensions to the XPG4 Version 2 specification are:
• The close() function can return the errno value [EISGUARDIAN].
The use of this function with the POSIX User Thread Model library conforms to the following
industry standards:
• IEEE Std 1003.1-2004, POSIX System Application Program Interface
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