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The
argument is a socket that has been created with bound to an address with
and is listening for connections after a The argument extracts the first
connection request on the queue of pending connections, creates a new socket
with the same properties of and allocates a new file descriptor for the
socket. If no pending connections are present on the queue, and the socket
is not marked as non-blocking, blocks the caller until a connection is
present. If the socket is marked non-blocking and no pending connections
are present on the queue, returns an error as described below. The accepted
socket may not be used to accept more connections. The original socket
remains open. The argument is a result parameter that is filled in with
the address of the connecting entity, as known to the communications layer.
The exact format of the parameter is determined by the domain in which
the communication is occurring. The is a value-result parameter; it should
initially contain the amount of space pointed to by on return it will
contain the actual length (in bytes) of the address returned. This call
is used with connection-based socket types, currently with It is possible
to a socket for the purposes of doing an by selecting it for read. For
certain protocols which require an explicit confirmation, such as or
can be thought of as merely dequeuing the next connection request and
not implying confirmation. Confirmation can be implied by a normal read
or write on the new file descriptor, and rejection can be implied by closing
the new socket. One can obtain user connection request data without confirming
the connection by issuing a call with an of 0 and a non-zero or by issuing
a request. Similarly, one can provide user connection rejection information
by issuing a call with providing only the control information, or by calling
The call returns -1 on error. If it succeeds, it returns a
non-negative integer that is a descriptor for the accepted socket.
The
will fail if: The descriptor is invalid. The descriptor references a
file, not a socket. The referenced socket is not of type The parameter
is not in a writable part of the user address space. The socket is marked
non-blocking and no connections are present to be accepted.
The function appeared in
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