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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "ACCEPT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" accept 
+.SH NAME
+accept \- accept a new connection on a socket
+.SH SYNOPSIS
+.LP
+\fB#include <sys/socket.h>
+.br
+.sp
+int accept(int\fP \fIsocket\fP\fB, struct sockaddr *restrict\fP \fIaddress\fP\fB,
+.br
+\ \ \ \ \ \  socklen_t *restrict\fP \fIaddress_len\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIaccept\fP() function shall extract the first connection on
+the queue of pending connections, create a new socket with
+the same socket type protocol and address family as the specified
+socket, and allocate a new file descriptor for that socket.
+.LP
+The \fIaccept\fP() function takes the following arguments:
+.TP 7
+\fIsocket\fP
+Specifies a socket that was created with \fIsocket\fP(), has been
+bound to an address
+with \fIbind\fP(), and has issued a successful call to \fIlisten\fP().
+.TP 7
+\fIaddress\fP
+Either a null pointer, or a pointer to a \fBsockaddr\fP structure
+where the address of the connecting socket shall be
+returned.
+.TP 7
+\fIaddress_len\fP
+Points to a \fBsocklen_t\fP structure which on input specifies the
+length of the supplied \fBsockaddr\fP structure, and on
+output specifies the length of the stored address.
+.sp
+.LP
+If \fIaddress\fP is not a null pointer, the address of the peer for
+the accepted connection shall be stored in the
+\fBsockaddr\fP structure pointed to by \fIaddress\fP, and the length
+of this address shall be stored in the object pointed to by
+\fIaddress_len\fP.
+.LP
+If the actual length of the address is greater than the length of
+the supplied \fBsockaddr\fP structure, the stored address
+shall be truncated.
+.LP
+If the protocol permits connections by unbound clients, and the peer
+is not bound, then the value stored in the object pointed
+to by \fIaddress\fP is unspecified.
+.LP
+If the listen queue is empty of connection requests and O_NONBLOCK
+is not set on the file descriptor for the socket,
+\fIaccept\fP() shall block until a connection is present. If the \fIlisten\fP()
+queue is
+empty of connection requests and O_NONBLOCK is set on the file descriptor
+for the socket, \fIaccept\fP() shall fail and set
+\fIerrno\fP to [EAGAIN] or [EWOULDBLOCK].
+.LP
+The accepted socket cannot itself accept more connections. The original
+socket remains open and can accept more connections.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIaccept\fP() shall return the non-negative
+file descriptor of the accepted socket. Otherwise, -1
+shall be returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fIaccept\fP() function shall fail if:
+.TP 7
+.B EAGAIN \fRor\fP EWOULDBLOCK
+.sp
+O_NONBLOCK is set for the socket file descriptor and no connections
+are present to be accepted.
+.TP 7
+.B EBADF
+The \fIsocket\fP argument is not a valid file descriptor.
+.TP 7
+.B ECONNABORTED
+.sp
+A connection has been aborted.
+.TP 7
+.B EINTR
+The \fIaccept\fP() function was interrupted by a signal that was caught
+before a valid connection arrived.
+.TP 7
+.B EINVAL
+The \fIsocket\fP is not accepting connections.
+.TP 7
+.B EMFILE
+{OPEN_MAX} file descriptors are currently open in the calling process.
+.TP 7
+.B ENFILE
+The maximum number of file descriptors in the system are already open.
+.TP 7
+.B ENOTSOCK
+The \fIsocket\fP argument does not refer to a socket.
+.TP 7
+.B EOPNOTSUPP
+The socket type of the specified socket does not support accepting
+connections.
+.sp
+.LP
+The \fIaccept\fP() function may fail if:
+.TP 7
+.B ENOBUFS
+No buffer space is available.
+.TP 7
+.B ENOMEM
+There was insufficient memory available to complete the operation.
+.TP 7
+.B EPROTO
+A protocol error has occurred; for example, the STREAMS protocol stack
+has not been initialized. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+When a connection is available, \fIselect\fP() indicates that the
+file descriptor for
+the socket is ready for reading.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIbind\fP() , \fIconnect\fP() , \fIlisten\fP()
+, \fIsocket\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<sys/socket.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .