accept(3XNET)					   X/Open Networking Services Library Functions 				     accept(3XNET)

NAME

       accept - accept a new connection on a socket

SYNOPSIS

       cc [ flag ... ] file ... -lxnet [ library ... ]
       #include <sys/socket.h>

       int accept(int socket, struct sockaddr *restrict address,
	    socklen_t *restrict address_len);

DESCRIPTION

       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 suc-
		      cessful 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.

USAGE

       When a connection is available, select(3C) will indicate that the file descriptor for the socket is ready for reading.

RETURN VALUES

       Upon successful completion, accept() returns the nonnegative file descriptor of the accepted socket.  Otherwise, -1 is returned	and  errno
       is set to indicate the error.

ERRORS

       The accept() function will fail if:

       EAGAIN	       O_NONBLOCK is set for the socket file descriptor and no connections are present to be accepted.
       EWOULDBLOCK

       EBADF	       The socket argument is not a valid file descriptor.

       ECONNABORTED    A connection has been aborted.

       EFAULT	       The  address or	address_len parameter can not be accessed or written.

       EINTR	       The accept() function was interrupted by a signal that was caught before a valid connection arrived.

       EINVAL	       The socket is not accepting connections.

       EMFILE	       OPEN_MAX file descriptors are currently open in the calling process.

       ENFILE	       The maximum number of file descriptors in the system are already open.

       ENOTSOCK        The socket argument does not refer to a socket.

       EOPNOTSUPP      The socket type of the specified socket does not support accepting connections.

       The accept() function may fail if:

       ENOBUFS	  No buffer space is available.

       ENOMEM	  There was insufficient memory available to complete the operation.

       ENOSR	  There was insufficient STREAMS resources available to complete the operation.

       EPROTO	  A protocol error has occurred; for example, the STREAMS protocol stack has not been initialized.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bind(3XNET), connect(3XNET), listen(3XNET), socket(3XNET), attributes(5), standards(5)

SunOS 5.11							    1 Nov 2003							     accept(3XNET)