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e95de74d4c
The virNetlinkCommand() method takes an 'unsigned char **'
parameter to be filled with the received netlink message.
The callers then immediately cast this to 'struct nlmsghdr',
triggering (bogus) warnings about increasing alignment
requirements
util/virnetdev.c: In function 'virNetDevLinkDump':
util/virnetdev.c:1300:12: warning: cast increases required alignment of target type [-Wcast-align]
resp = (struct nlmsghdr *)*recvbuf;
^
util/virnetdev.c: In function 'virNetDevSetVfConfig':
util/virnetdev.c:1429:12: warning: cast increases required alignment of target type [-Wcast-align]
resp = (struct nlmsghdr *)recvbuf;
Since all callers cast to 'struct nlmsghdr' we can avoid
the warning problem entirely by simply changing the
signature of virNetlinkCommand to return a 'struct nlmsghdr **'
instead of 'unsigned char **'. The way we do the cast inside
virNetlinkCommand does not have any alignment issues.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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* Copyright (C) 2010-2012 Red Hat, Inc.
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* Copyright (C) 2010-2012 IBM Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef __VIR_NETLINK_H__
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# define __VIR_NETLINK_H__
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# include "config.h"
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# include "internal.h"
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# include "virmacaddr.h"
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# if defined(__linux__) && defined(HAVE_LIBNL)
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/* Work around a bug where older libnl-1 headers expected older gcc
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* semantics of 'extern inline' that conflict with C99 semantics. */
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# ifdef HAVE_LIBNL1
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# define inline
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# endif
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# include <netlink/msg.h>
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# ifdef HAVE_LIBNL1
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# undef inline
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# endif
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# else
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struct nl_msg;
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struct sockaddr_nl;
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struct nlattr;
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struct nlmsghdr;
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# endif /* __linux__ */
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int virNetlinkStartup(void);
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void virNetlinkShutdown(void);
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int virNetlinkCommand(struct nl_msg *nl_msg,
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struct nlmsghdr **resp, unsigned int *respbuflen,
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uint32_t src_pid, uint32_t dst_pid,
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unsigned int protocol, unsigned int groups);
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typedef void (*virNetlinkEventHandleCallback)(struct nlmsghdr *,
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unsigned int length,
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struct sockaddr_nl *peer,
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bool *handled,
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void *opaque);
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typedef void (*virNetlinkEventRemoveCallback)(int watch, const virMacAddrPtr macaddr, void *opaque);
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/**
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* stopNetlinkEventServer: stop the monitor to receive netlink messages for libvirtd
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*/
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int virNetlinkEventServiceStop(unsigned int protocol);
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/**
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* stopNetlinkEventServerAll: stop all the monitors to receive netlink messages for libvirtd
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*/
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int virNetlinkEventServiceStopAll(void);
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/**
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* startNetlinkEventServer: start a monitor to receive netlink messages for libvirtd
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*/
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int virNetlinkEventServiceStart(unsigned int protocol, unsigned int groups);
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/**
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* virNetlinkEventServiceIsRunning: returns if the netlink event service is running.
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*/
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bool virNetlinkEventServiceIsRunning(unsigned int protocol);
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/**
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* virNetlinkEventServiceLocalPid: returns nl_pid used to bind() netlink socket
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*/
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int virNetlinkEventServiceLocalPid(unsigned int protocol);
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/**
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* virNetlinkEventAddClient: register a callback for handling of netlink messages
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*/
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int virNetlinkEventAddClient(virNetlinkEventHandleCallback handleCB,
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virNetlinkEventRemoveCallback removeCB,
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void *opaque, const virMacAddrPtr macaddr,
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unsigned int protocol);
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/**
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* virNetlinkEventRemoveClient: unregister a callback from a netlink monitor
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*/
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int virNetlinkEventRemoveClient(int watch, const virMacAddrPtr macaddr,
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unsigned int protocol);
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#endif /* __VIR_NETLINK_H__ */
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