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Commit7de2dfc

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Fix code that doesn't work on machines with strict alignment requirements:
must use memcpy here rather than struct assignment.In passing, rearrange some randomly-ordered declarations to be a tad lessrandom.
1 parent481cb5d commit7de2dfc

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1 file changed

+33
-32
lines changed

1 file changed

+33
-32
lines changed

‎src/backend/replication/walreceiver.c‎

Lines changed: 33 additions & 32 deletions
Original file line numberDiff line numberDiff line change
@@ -29,7 +29,7 @@
2929
*
3030
*
3131
* IDENTIFICATION
32-
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.9 2010/04/19 14:10:45 mha Exp $
32+
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.10 2010/04/20 22:55:03 tgl Exp $
3333
*
3434
*-------------------------------------------------------------------------
3535
*/
@@ -76,9 +76,15 @@ static uint32 recvOff = 0;
7676
staticvolatilesig_atomic_tgot_SIGHUP= false;
7777
staticvolatilesig_atomic_tgot_SIGTERM= false;
7878

79-
staticvoidProcessWalRcvInterrupts(void);
80-
staticvoidEnableWalRcvImmediateExit(void);
81-
staticvoidDisableWalRcvImmediateExit(void);
79+
/*
80+
* LogstreamResult indicates the byte positions that we have already
81+
* written/fsynced.
82+
*/
83+
staticstruct
84+
{
85+
XLogRecPtrWrite;/* last byte + 1 written out in the standby */
86+
XLogRecPtrFlush;/* last byte + 1 flushed in the standby */
87+
}LogstreamResult;
8288

8389
/*
8490
* About SIGTERM handling:
@@ -98,6 +104,21 @@ static void DisableWalRcvImmediateExit(void);
98104
*/
99105
staticvolatileboolWalRcvImmediateInterruptOK= false;
100106

107+
/* Prototypes for private functions */
108+
staticvoidProcessWalRcvInterrupts(void);
109+
staticvoidEnableWalRcvImmediateExit(void);
110+
staticvoidDisableWalRcvImmediateExit(void);
111+
staticvoidWalRcvDie(intcode,Datumarg);
112+
staticvoidXLogWalRcvProcessMsg(unsignedchartype,char*buf,Sizelen);
113+
staticvoidXLogWalRcvWrite(char*buf,Sizenbytes,XLogRecPtrrecptr);
114+
staticvoidXLogWalRcvFlush(void);
115+
116+
/* Signal handlers */
117+
staticvoidWalRcvSigHupHandler(SIGNAL_ARGS);
118+
staticvoidWalRcvShutdownHandler(SIGNAL_ARGS);
119+
staticvoidWalRcvQuickDieHandler(SIGNAL_ARGS);
120+
121+
101122
staticvoid
102123
ProcessWalRcvInterrupts(void)
103124
{
@@ -118,47 +139,25 @@ ProcessWalRcvInterrupts(void)
118139
}
119140

120141
staticvoid
121-
EnableWalRcvImmediateExit()
142+
EnableWalRcvImmediateExit(void)
122143
{
123144
WalRcvImmediateInterruptOK= true;
124145
ProcessWalRcvInterrupts();
125146
}
126147

127148
staticvoid
128-
DisableWalRcvImmediateExit()
149+
DisableWalRcvImmediateExit(void)
129150
{
130151
WalRcvImmediateInterruptOK= false;
131152
ProcessWalRcvInterrupts();
132153
}
133154

134-
/* Signal handlers */
135-
staticvoidWalRcvSigHupHandler(SIGNAL_ARGS);
136-
staticvoidWalRcvShutdownHandler(SIGNAL_ARGS);
137-
staticvoidWalRcvQuickDieHandler(SIGNAL_ARGS);
138-
139-
/* Prototypes for private functions */
140-
staticvoidWalRcvDie(intcode,Datumarg);
141-
staticvoidXLogWalRcvProcessMsg(unsignedchartype,char*buf,Sizelen);
142-
staticvoidXLogWalRcvWrite(char*buf,Sizenbytes,XLogRecPtrrecptr);
143-
staticvoidXLogWalRcvFlush(void);
144-
145-
/*
146-
* LogstreamResult indicates the byte positions that we have already
147-
* written/fsynced.
148-
*/
149-
staticstruct
150-
{
151-
XLogRecPtrWrite;/* last byte + 1 written out in the standby */
152-
XLogRecPtrFlush;/* last byte + 1 flushed in the standby */
153-
}LogstreamResult;
154-
155155
/* Main entry point for walreceiver process */
156156
void
157157
WalReceiverMain(void)
158158
{
159159
charconninfo[MAXCONNINFO];
160160
XLogRecPtrstartpoint;
161-
162161
/* use volatile pointer to prevent code rearrangement */
163162
volatileWalRcvData*walrcv=WalRcv;
164163

@@ -398,19 +397,21 @@ XLogWalRcvProcessMsg(unsigned char type, char *buf, Size len)
398397

399398
if (len<sizeof(XLogRecPtr))
400399
ereport(ERROR,
401-
(errmsg("invalid WAL message received from primary")));
400+
(errcode(ERRCODE_PROTOCOL_VIOLATION),
401+
errmsg_internal("invalid WAL message received from primary")));
402402

403-
recptr=*((XLogRecPtr*)buf);
403+
memcpy(&recptr,buf,sizeof(XLogRecPtr));
404404
buf+=sizeof(XLogRecPtr);
405405
len-=sizeof(XLogRecPtr);
406+
406407
XLogWalRcvWrite(buf,len,recptr);
407408
break;
408409
}
409410
default:
410411
ereport(ERROR,
411412
(errcode(ERRCODE_PROTOCOL_VIOLATION),
412-
errmsg("invalid replication message type %d",
413-
type)));
413+
errmsg_internal("invalid replication message type %d",
414+
type)));
414415
}
415416
}
416417

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