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Systemtap 1.2 <sys/sdt.h> tried to expand STAP_PROBE3 into an initialization: volatile __typeof__(arg) foo = arg; but that fails if arg was declared as 'char arg[100]'. Rather than make all callers to PROBE deal with the stupidity of <sys/sdt.h>, we instead make PROBE cast away the problem. Some of this preprocessor abuse copies ideas in src/libvirt.c. * daemon/libvirtd.h (PROBE): Add casts to all arguments, using... (VIR_ADD_CASTS, VIR_ADD_CAST, VIR_ADD_CAST2, VIR_ADD_CAST3) (VIR_ADD_CAST_EXPAND, VIR_ADD_CAST_PASTE, VIR_COUNT_ARGS) (VIR_ARG5, PROBE_EXPAND): New macros. Reported by Wen Congyang.
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
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* libvirtd.h: daemon data structure definitions
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*
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* Copyright (C) 2006-2011 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Daniel P. Berrange <berrange@redhat.com>
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*/
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#ifndef QEMUD_INTERNAL_H__
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# define QEMUD_INTERNAL_H__
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# include <config.h>
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# include <rpc/types.h>
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# include <rpc/xdr.h>
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# include "remote_protocol.h"
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# include "qemu_protocol.h"
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# include "logging.h"
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# include "threads.h"
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# include "network.h"
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# if HAVE_SASL
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# include "virnetsaslcontext.h"
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# endif
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# include "virnetserverprogram.h"
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# if WITH_DTRACE
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# ifndef LIBVIRTD_PROBES_H
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# define LIBVIRTD_PROBES_H
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# include "probes.h"
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# endif /* LIBVIRTD_PROBES_H */
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/* Systemtap 1.2 headers have a bug where they cannot handle a
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* variable declared with array type. Work around this by casting all
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* arguments. This is some gross use of the preprocessor because
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* PROBE is a var-arg macro, but it is better than the alternative of
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* making all callers to PROBE have to be aware of the issues. And
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* hopefully, if we ever add a call to PROBE with other than 2 or 3
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* end arguments, you can figure out the pattern to extend this hack.
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*/
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# define VIR_COUNT_ARGS(...) VIR_ARG5(__VA_ARGS__, 4, 3, 2, 1)
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# define VIR_ARG5(_1, _2, _3, _4, _5, ...) _5
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# define VIR_ADD_CAST_EXPAND(a, b, ...) VIR_ADD_CAST_PASTE(a, b, __VA_ARGS__)
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# define VIR_ADD_CAST_PASTE(a, b, ...) a##b(__VA_ARGS__)
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/* The double cast is necessary to silence gcc warnings; any pointer
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* can safely go to intptr_t and back to void *, which collapses
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* arrays into pointers; while any integer can be widened to intptr_t
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* then cast to void *. */
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# define VIR_ADD_CAST(a) ((void *)(intptr_t)(a))
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# define VIR_ADD_CAST2(a, b) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b)
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# define VIR_ADD_CAST3(a, b, c) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c)
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# define VIR_ADD_CASTS(...) \
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VIR_ADD_CAST_EXPAND(VIR_ADD_CAST, VIR_COUNT_ARGS(__VA_ARGS__), \
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__VA_ARGS__)
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# define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT("trace." __FILE__ , __func__, __LINE__, \
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#NAME ": " FMT, __VA_ARGS__); \
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if (LIBVIRTD_ ## NAME ## _ENABLED()) { \
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PROBE_EXPAND(LIBVIRTD_ ## NAME, \
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VIR_ADD_CASTS(__VA_ARGS__)); \
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}
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# else
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT("trace." __FILE__, __func__, __LINE__, \
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#NAME ": " FMT, __VA_ARGS__);
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# endif
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typedef struct daemonClientStream daemonClientStream;
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typedef daemonClientStream *daemonClientStreamPtr;
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typedef struct daemonClientPrivate daemonClientPrivate;
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typedef daemonClientPrivate *daemonClientPrivatePtr;
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/* Stores the per-client connection state */
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struct daemonClientPrivate {
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/* Hold while accessing any data except conn */
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virMutex lock;
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int domainEventCallbackID[VIR_DOMAIN_EVENT_ID_LAST];
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# if HAVE_SASL
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virNetSASLSessionPtr sasl;
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# endif
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/* This is only valid if a remote open call has been made on this
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* connection, otherwise it will be NULL. Also if remote close is
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* called, it will be set back to NULL if that succeeds.
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*/
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virConnectPtr conn;
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daemonClientStreamPtr streams;
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};
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# if HAVE_SASL
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extern virNetSASLContextPtr saslCtxt;
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# endif
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extern virNetServerProgramPtr remoteProgram;
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extern virNetServerProgramPtr qemuProgram;
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#endif
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