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All Rights Reserved .\" .TH ACCEPT 3XNET "Nov 1, 2003" .SH NAME accept \- accept a new connection on a socket .SH SYNOPSIS .LP .nf \fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lxnet\fR [ \fIlibrary\fR ... ] #include \fBint\fR \fBaccept\fR(\fBint\fR \fIsocket\fR, \fBstruct sockaddr *restrict\fR \fIaddress\fR, \fBsocklen_t *restrict\fR \fIaddress_len\fR); .fi .SH DESCRIPTION .LP The \fBaccept()\fR 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. .sp .LP The function takes the following arguments: .sp .ne 2 .na \fB\fIsocket\fR\fR .ad .RS 15n Specifies a socket that was created with \fBsocket\fR(3XNET), has been bound to an address with \fBbind\fR(3XNET), and has issued a successful call to \fBlisten\fR(3XNET). .RE .sp .ne 2 .na \fB\fIaddress\fR\fR .ad .RS 15n Either a null pointer, or a pointer to a \fBsockaddr\fR structure where the address of the connecting socket will be returned. .RE .sp .ne 2 .na \fB\fIaddress_len\fR\fR .ad .RS 15n Points to a \fBsocklen_t\fR which on input specifies the length of the supplied \fBsockaddr\fR structure, and on output specifies the length of the stored address. .RE .sp .LP If \fIaddress\fR is not a null pointer, the address of the peer for the accepted connection is stored in the \fBsockaddr\fR structure pointed to by \fIaddress\fR, and the length of this address is stored in the object pointed to by \fIaddress_len\fR. .sp .LP If the actual length of the address is greater than the length of the supplied \fBsockaddr\fR structure, the stored address will be truncated. .sp .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\fR is unspecified. .sp .LP If the listen queue is empty of connection requests and O_NONBLOCK is not set on the file descriptor for the socket, \fBaccept()\fR will block until a connection is present. If the \fBlisten\fR(3XNET) queue is empty of connection requests and O_NONBLOCK is set on the file descriptor for the socket, \fBaccept()\fR will fail and set \fBerrno\fR to \fBEAGAIN\fR or \fBEWOULDBLOCK\fR. .sp .LP The accepted socket cannot itself accept more connections. The original socket remains open and can accept more connections. .SH USAGE .LP When a connection is available, \fBselect\fR(3C) will indicate that the file descriptor for the socket is ready for reading. .SH RETURN VALUES .LP Upon successful completion, \fBaccept()\fR returns the nonnegative file descriptor of the accepted socket. Otherwise, \(mi1 is returned and \fBerrno\fR is set to indicate the error. .SH ERRORS .LP The \fBaccept()\fR function will fail if: .sp .ne 2 .na \fB\fBEAGAIN\fR\fR .ad .br .na \fB\fBEWOULDBLOCK\fR\fR .ad .RS 16n O_NONBLOCK is set for the socket file descriptor and no connections are present to be accepted. .RE .sp .ne 2 .na \fB\fBEBADF\fR\fR .ad .RS 16n The \fIsocket\fR argument is not a valid file descriptor. .RE .sp .ne 2 .na \fB\fBECONNABORTED\fR\fR .ad .RS 16n A connection has been aborted. .RE .sp .ne 2 .na \fB\fBEFAULT\fR\fR .ad .RS 16n The \fIaddress\fR or \fIaddress_len\fR parameter can not be accessed or written. .RE .sp .ne 2 .na \fB\fBEINTR\fR\fR .ad .RS 16n The \fBaccept()\fR function was interrupted by a signal that was caught before a valid connection arrived. .RE .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 16n The \fIsocket\fR is not accepting connections. .RE .sp .ne 2 .na \fB\fBEMFILE\fR\fR .ad .RS 16n \fBOPEN_MAX\fR file descriptors are currently open in the calling process. .RE .sp .ne 2 .na \fB\fBENFILE\fR\fR .ad .RS 16n The maximum number of file descriptors in the system are already open. .RE .sp .ne 2 .na \fB\fBENOTSOCK\fR\fR .ad .RS 16n The \fIsocket\fR argument does not refer to a socket. .RE .sp .ne 2 .na \fB\fBEOPNOTSUPP\fR\fR .ad .RS 16n The socket type of the specified socket does not support accepting connections. .RE .sp .LP The \fBaccept()\fR function may fail if: .sp .ne 2 .na \fB\fBENOBUFS\fR\fR .ad .RS 11n No buffer space is available. .RE .sp .ne 2 .na \fB\fBENOMEM\fR\fR .ad .RS 11n There was insufficient memory available to complete the operation. .RE .sp .ne 2 .na \fB\fBENOSR\fR\fR .ad .RS 11n There was insufficient STREAMS resources available to complete the operation. .RE .sp .ne 2 .na \fB\fBEPROTO\fR\fR .ad .RS 11n A protocol error has occurred; for example, the STREAMS protocol stack has not been initialized. .RE .SH ATTRIBUTES .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Standard _ MT-Level MT-Safe .TE .SH SEE ALSO .LP .BR sockaddr (3SOCKET), .BR bind (3XNET), .BR connect (3XNET), .BR listen (3XNET), .BR socket (3XNET), .BR attributes (7), .BR standards (7)