accept(3SOCKET) 					     Sockets Library Functions						   accept(3SOCKET)

NAME

       accept - accept a connection on a socket

SYNOPSIS

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

       int accept(int s, struct sockaddr *addr, socklen_t *addrlen);

DESCRIPTION

       The argument s is a socket that has been created with socket(3SOCKET) and bound to an address with bind(3SOCKET), and that is listening for
       connections after a call to listen(3SOCKET). The accept() function extracts the first connection on the queue of pending connections,  cre-
       ates  a new socket with the properties of s, and allocates a new file descriptor, ns, 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  as  non-blocking  and  no pending connections are present on the queue, accept() returns an error as described below.  The accept()
       function uses the netconfig(4) file to determine the STREAMS device file name associated with s.  This is the device on which  the  connect
       indication will be accepted. The accepted socket, ns, is used to read and write data to and from the socket that connected to ns. 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 it is known  to  the  communications
       layer. The exact format of the addr parameter is determined by the domain in which the communication occurs.

       The  argument addrlen is a value-result parameter. Initially, it contains the amount of space pointed to by addr; on return it contains the
       length in bytes of the address returned.

       The accept() function is used with connection-based socket types, currently with SOCK_STREAM.

       It is possible to select(3C) or poll(2) a socket for the purpose of an accept() by selecting or polling it for a read. However,	this  will
       only indicate when a connect indication is pending; it is still necessary to call accept().

RETURN VALUES

       The accept() function returns -1 on error. If it succeeds, it returns a non-negative integer that is a descriptor for the accepted socket.

ERRORS

       accept() will fail if:

       EBADF		       The descriptor is invalid.

       ECONNABORTED	       The remote side aborted the connection before the accept() operation completed.

       EFAULT		       The addr parameter or the addrlen parameter is invalid.

       EINTR		       The accept() attempt was interrupted by the delivery of a signal.

       EMFILE		       The per-process descriptor table is full.

       ENODEV		       The protocol family and type corresponding to  s could not be found in the netconfig file.

       ENOMEM		       There was insufficient user memory available to complete the operation.

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

       ENOTSOCK 	       The descriptor does not reference a socket.

       EOPNOTSUPP	       The referenced socket is not of type SOCK_STREAM.

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

       EWOULDBLOCK	       The socket is marked as non-blocking and no connections are present to be accepted.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       poll(2), bind(3SOCKET), connect(3SOCKET), listen(3SOCKET), select(3C), socket.h(3HEAD), socket(3SOCKET), netconfig(4), attributes(5)

SunOS 5.10							    24 Jan 2002 						   accept(3SOCKET)