The accept() function extracts the first connection on the queue of pending connections, creates a new socket with the same socket type protocol and address family as the specified
socket, and allocates a new file descriptor for that socket.
The function takes the following arguments:
-
socket
- Specifies a socket that was created with socket(3XNET), has been bound to an address with bind(3XNET), and has issued a successful call to listen(3XNET).
-
address
- Either a null pointer, or a pointer to a sockaddr structure where the address of the connecting socket will
be returned.
-
address_len
- Points to a socklen_t which on input specifies the length of the supplied sockaddr
structure, and on output specifies the length of the stored address.
If address is not a null pointer, the address of the peer for the accepted connection is stored in the sockaddr structure pointed to by address, and the length of this address is stored in the object pointed to by address_len.
If the actual length of the address is greater than the length of the supplied sockaddr structure, the stored address will be truncated.
If the protocol permits connections by unbound clients, and the peer is not bound, then the value stored in the object pointed to by address is unspecified.
If the listen queue is empty of connection requests and O_NONBLOCK is not set on the file descriptor for the socket, accept() will block until a connection is present. If the listen(3XNET) queue is empty of connection requests and O_NONBLOCK is set on the file descriptor
for the socket, accept() will fail and set errno to EAGAIN or EWOULDBLOCK.
The accepted socket cannot itself accept more connections. The original socket remains open and can accept more connections.
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