'\" rtp.\" -*- nroff -*- vim: ft=nroff noautoindent nocindent nosmartindent.\".\" @(#) accept.3.man,v 1.1.2.1 2004/05/16 02:35:34 brian Exp.\".\" =========================================================================.\".\" Copyright (C) 2001-2004  OpenSS7 Corporation <www.openss7.com>.\".\" All Rights Reserved..\".\" Permission is granted to make and distribute verbatim copies of this.\" manual provided the copyright notice and this permission notice are.\" preserved on all copies..\".\" Permission is granted to copy and distribute modified versions of this.\" manual under the conditions for verbatim copying, provided that the.\" entire resulting derived work is distributed under the terms of a.\" permission notice identical to this one.\" .\" Since the Linux kernel and libraries are constantly changing, this.\" manual page may be incorrect or out-of-date.  The author(s) assume no.\" responsibility for errors or omissions, or for damages resulting from.\" the use of the information contained herein.  The author(s) may not.\" have taken the same level of care in the production of this manual,.\" which is licensed free of charge, as they might when working.\" professionally..\" .\" Formatted or processed versions of this manual, if unaccompanied by.\" the source, must acknowledge the copyright and authors of this work..\".\" -------------------------------------------------------------------------.\".\" U.S. GOVERNMENT RESTRICTED RIGHTS.  If you are licensing this Software.\" on behalf of the U.S. Government ("Government"), the following.\" provisions apply to you.  If the Software is supplied by the Department.\" of Defense ("DoD"), it is classified as "Commercial Computer Software".\" under paragraph 252.227-7014 of the DoD Supplement to the Federal.\" Acquisition Regulations ("DFARS") (or any successor regulations) and the.\" Government is acquiring only the license rights granted herein (the.\" license rights customarily provided to non-Government users).  If the.\" Software is supplied to any unit or agency of the Government other than.\" DoD, it is classified as "Restricted Computer Software" and the.\" Government's rights in the Software are defined in paragraph 52.227-19.\" of the Federal Acquisition Regulations ("FAR") (or any success.\" regulations) or, in the cases of NASA, in paragraph 18.52.227-86 of the.\" NASA Supplement to the FAR (or any successor regulations)..\".\" =========================================================================.\" .\" Commercial licensing and support of this software is available from.\" OpenSS7 Corporation at a fee.  See http://www.openss7.com/.\" .\" =========================================================================.\".\" Last Modified 2004/05/16 02:35:34 by brian.\".\" =========================================================================.so strxnet.macros.R1bracket-label "\fR[\fB" "\fR]" "\fR, \fB"no-default-databasedatabase strxnet.refsaccumulatemove-punctuationabbreviate Ajoin-authors ", " ", " " and "et-al " et al" 2 3abbreviate-label-ranges ".."sort-adjacent-labels.R2.\".\".TH ACCEPT 3 "2004/05/16 02:35:34" "strxnet-0_9_2-4" "Linux Fast-STREAMS Sockets Library".SH NAME.B accept\- accept a new connection on a socket.SH SYNOPSIS.PP.B #include <sys/socket.h>.HP.BI "int accept(int " socket ", struct sockaddr *" address ", socklen_t *" address_len );.SH DESCRIPTION.PPThe.BR 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 asthe specified socket, and allocates a new file descriptor for that socket..PPThe function takes the following arguments:.TP.I socketSpecifies a socket that was created with.BR socket (3),has been bound to anaddress with.BR bind (3),and has issued a successful call to.BR listen (3)..TP.I addressEither a null pointer, or a pointer to a sockaddr structure where the addressof the connecting socket will be returned..TP.I address_lenPoints to a socklen_t which on input specifies the length of the suppliedsockaddr structure, and on output specifies the length of the stored address..PPIf address is not a null pointer, the address of the peer for the acceptedconnection is stored in the sockaddr structure pointed to by address, and thelength of this address is stored in the object pointed to by address_len..PPIf the actual length of the address is greater than the length of the suppliedsockaddr structure, the stored address will be truncated..PPIf the protocol permits connections by unbound clients, and the peer is notbound, then the value stored in the object pointed to by address isunspecified..PPIf the listen queue is empty of connection requests and.B O_NONBLOCKis not seton the file descriptor for the socket,.BR accept ()will block until a connection is present. If the.BR listen (3)queue is empty ofconnection requests and.B O_NONBLOCKis set on the file descriptor for thesocket,.BR accept ()will fail and set errno to.RB [ EAGAIN ]or.RB [ EWOULDBLOCK ]..PPThe accepted socket cannot itself accept more connections. The original socketremains open and can accept more connections..SH NOTES.PPWhen a connection is available,.BR select (2)will indicate that the filedescriptor for the socket is ready for reading..SH CAVEATS.PPThis system call is implemented as a.B SIOCSOCKSYSIOCTL.  See.BR socksys (4)for more information..SH "RETURN VALUE".PPUpon successful completion,.BR accept ()returns the non-negative file descriptorof the accepted socket. Otherwise, -1 is returned and errno is set to indicatethe error..SH ERRORS.PPThe.BR accept ()function will fail if:.TP.RB [ EAGAIN "] or [" EWOULDBLOCK ].B O_NONBLOCKis set for the socket file descriptor and no connections arepresent to be accepted..TP.RB [ EBADF ]The socket argument is not a valid file descriptor..TP.RB [ ECONNABORTED ]A connection has been aborted..TP.RB [ EFAULT ]The address or address_len parameter can not be accessed or written..TP.RB [ EINTR ]The.BR accept ()function was interrupted by a signal that was caught before a valid connectionarrived..TP.RB [ EINVAL ]The socket is not accepting connections..TP.RB [ EMFILE ]{OPEN_MAX} file descriptors are currently open in the calling process..TP.RB [ ENFILE ]The maximum number of file descriptors in the system are already open..TP.RB [ ENOTSOCK ]The socket argument does not refer to a socket..TP.RB [ EOPNOTSUPP ]The socket type of the specified socket does not support acceptingconnections..TP.RB [ ENOBUFS ]No buffer space is available..TP.RB [ ENOMEM ]There was insufficient memory available to complete the operation..TP.RB [ ENOSR ]There was insufficient STREAMS resources available to complete the operation..TP.RB [ EPROTO ]A protocol error has occurred; for example, the STREAMS protocol stack has notbeen initialised..SH "SEE ALSO".PP.BR bind (3),.BR connect (3),.BR listen (3),.BR socket (3),.BR <sys/socket.h> (5)..SH "CONFORMING TO".PPThe Open Group XNS Issue 5.2..[xns.].\".\".[$LIST$.].TI