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The argument
s is a socket that has been created with
socket(2), bound to an address with
bind(2), and is listening for connections after a
listen(2). accept()
extracts the first connection
on the queue of pending connections, creates
a new socket with the same properties of
s 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,
accept()
blocks the caller until a connection is present.
If the socket is marked non-blocking and no pending
connections are present on the queue,
accept()
returns an error as described below.
The accepted socket
is used to read and write data to and from the socket which connected
to this one; it is not used
to accept more connections. The original socket
s remains open for accepting further connections.
The argument
addr 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
addr parameter is determined by the domain in which the communication
is occurring.
The
addrlen is a value-result parameter; it should initially contain the
amount of space pointed to by
addr; 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
SOCK_STREAMfR.
It is possible to
select(2) a socket for the purposes of doing an
accept()
by selecting it for read.
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