[unix-history] / usr / man / man2 / listen.2

.TH LISTEN 2 "12 February 1983"
.UC 4
.SH NAME
listen \- listen for connections on a socket
.SH SYNOPSIS
.nf
.ft B
listen(s, backlog)
int s, backlog;
.fi
.SH DESCRIPTION
To accept connections, a socket
is first created with
.IR socket (2),
a backlog for incoming connections is specified with
.IR listen (2)
and then the connections are
accepted with
.IR accept (2).
The
.I listen
call applies only to sockets of type
SOCK_STREAM
or
SOCK_PKTSTREAM.
.PP
The
.I backlog
parameter defines the maximum length the queue of
pending connections may grow to.
If a connection
request arrives with the queue full the client will
receive an error with an indication of ECONNREFUSED.
.SH "RETURN VALUE
A 0 return value indicates success; \-1 indicates an error.
.SH "ERRORS
The call fails if:
.TP 20
[EBADF]
The argument \fIs\fP is not a valid descriptor.
.TP 20
[ENOTSOCK]
The argument \fIs\fP is not a socket.
.TP 20
[EOPNOTSUPP]
The socket is not of a type that supports the operation \fIlisten\fP.
.SH "SEE ALSO"
accept(2), connect(2), socket(2)
.SH BUGS
The
.I backlog
is currently limited (silently) to 5.
Commit	Line	Data
bd121f65 C	1	.TH LISTEN 2 "12 February 1983"
	2	.UC 4
	3	.SH NAME
	4	listen \- listen for connections on a socket
	5	.SH SYNOPSIS
	6	.nf
	7	.ft B
	8	listen(s, backlog)
	9	int s, backlog;
	10	.fi
	11	.SH DESCRIPTION
	12	To accept connections, a socket
	13	is first created with
	14	.IR socket (2),
	15	a backlog for incoming connections is specified with
	16	.IR listen (2)
	17	and then the connections are
	18	accepted with
	19	.IR accept (2).
	20	The
	21	.I listen
	22	call applies only to sockets of type
	23	SOCK_STREAM
	24	or
	25	SOCK_PKTSTREAM.
	26	.PP
	27	The
	28	.I backlog
	29	parameter defines the maximum length the queue of
	30	pending connections may grow to.
	31	If a connection
	32	request arrives with the queue full the client will
	33	receive an error with an indication of ECONNREFUSED.
	34	.SH "RETURN VALUE
	35	A 0 return value indicates success; \-1 indicates an error.
	36	.SH "ERRORS
	37	The call fails if:
	38	.TP 20
	39	[EBADF]
	40	The argument \fIs\fP is not a valid descriptor.
	41	.TP 20
	42	[ENOTSOCK]
	43	The argument \fIs\fP is not a socket.
	44	.TP 20
	45	[EOPNOTSUPP]
	46	The socket is not of a type that supports the operation \fIlisten\fP.
	47	.SH "SEE ALSO"
	48	accept(2), connect(2), socket(2)
	49	.SH BUGS
	50	The
	51	.I backlog
	52	is currently limited (silently) to 5.