+++ /dev/null
-.TH IPQ_READ 3 "16 October 2001" "Linux iptables 1.2" "Linux Programmer's Manual"
-.\"
-.\" Copyright (c) 2000-2001 Netfilter Core Team
-.\"
-.\" This program is free software; you can redistribute it and/or modify
-.\" it under the terms of the GNU General Public License as published by
-.\" the Free Software Foundation; either version 2 of the License, or
-.\" (at your option) any later version.
-.\"
-.\" This program is distributed in the hope that it will be useful,
-.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
-.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-.\" GNU General Public License for more details.
-.\"
-.\" You should have received a copy of the GNU General Public License
-.\" along with this program; if not, write to the Free Software
-.\" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-.\"
-.\"
-.SH NAME
-ipq_read \(em read queue messages from ip_queue and read into supplied buffer
-.SH SYNOPSIS
-.B #include <linux/netfilter.h>
-.br
-.B #include <libipq.h>
-.sp
-.BI "ssize_t ipq_read(const struct ipq_handle *" h ", unsigned char *" buf ", size_t " len ", int " timeout ");"
-.SH DESCRIPTION
-The
-.B ipq_read
-function reads a queue message from the kernel and copies it to
-the memory pointed to by
-.I buf
-to a maximum length of
-. IR len .
-.PP
-The
-.I h
-parameter is a context handle which must previously have been returned
-successfully from a call to
-.BR ipq_create_handle .
-.PP
-The caller is responsible for ensuring that the memory pointed to by
-.I buf
-is large enough to contain
-.I len
-bytes.
-.PP
-The
-.I timeout
-parameter may be used to set a timeout for the operation, specified in microseconds.
-This is implemented internally by the library via the
-.BR select
-system call. A value of zero provides normal, backwards-compatible blocking behaviour
-with no timeout. A negative value causes the function to return immediately.
-.PP
-Data returned via
-.I buf
-should not be accessed directly. Use the
-.BR ipq_message_type ,
-.BR ipq_get_packet ", and"
-.BR ipq_get_msgerr
-functions to access the queue message in the buffer.
-.SH RETURN VALUE
-On failure, \-1 is returned.
-.br
-On success, a non-zero positive value is returned when no timeout
-value is specified.
-.br
-On success with a timeout value specified, zero is returned if no data
-was available to read, or if a non-blocked signal was caught. In the
-latter case, the global
-.B errno
-value will be set to
-.BR EINTR .
-.SH ERRORS
-On error, a descriptive error message will be available
-via the
-.B ipq_errstr
-function.
-.SH DIAGNOSTICS
-While the
-.B ipq_read
-function may return successfully, the queue message copied to the buffer
-may itself be an error message from a higher level kernel component. Use
-.B ipq_message_type
-to determine if it is an error message, and
-.B ipq_get_msgerr
-to access the value of the message.
-.SH BUGS
-None known.
-.SH AUTHOR
-James Morris <jmorris@intercode.com.au>
-.SH COPYRIGHT
-Copyright (c) 2000-2001 Netfilter Core Team.
-.PP
-Distributed under the GNU General Public License.
-.SH CREDITS
-Joost Remijn implemented the timeout feature, which appeared in the 1.2.4 release of iptables.
-.SH SEE ALSO
-.BR iptables (8),
-.BR libipq (3),
-.BR select (2).
-
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