[PATCH] Save major/minor opcodes in ClientRec for RecordAReply
Keith Packard
keithp at keithp.com
Mon Nov 14 09:04:18 PST 2011
On Tue, 8 Nov 2011 10:47:44 -0800, Jamey Sharp <jamey at minilop.net> wrote:
> And can I persuade you to just inline this directly into its only call
> site, below, in Dispatch? I don't think factoring it out enhances
> clarity in this case, especially since this way you need to look up the
> major opcode in both places.
Yeah, that's looks a lot simpler overall. Here's an updated version
From 9b54a88f8e17a2ab720bb1aa3eb2640b201be4d8 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp at keithp.com>
Date: Tue, 8 Nov 2011 10:13:15 -0800
Subject: [PATCH] Save major/minor opcodes in ClientRec for RecordAReply
The record extension needs the major and minor opcodes in the reply
hook, but the request buffer may have been freed by the time the hook
is invoked. Saving the request major and minor codes as the request is
executed avoids fetching from the defunct request buffer.
This patch also eliminates the public MinorOpcodeOfRequest function,
inlining it into Dispatch. Usages of that function have been replaced
with direct access to the new ClientRec field.
Signed-off-by: Keith Packard <keithp at keithp.com>
---
Xext/security.c | 4 +---
Xext/xselinux_hooks.c | 4 ++--
dix/dispatch.c | 23 +++++++++++++----------
dix/extension.c | 14 --------------
include/dixstruct.h | 1 +
include/extension.h | 2 --
record/record.c | 8 +++-----
7 files changed, 20 insertions(+), 36 deletions(-)
diff --git a/Xext/security.c b/Xext/security.c
index 08d8158..b0d82ab 100644
--- a/Xext/security.c
+++ b/Xext/security.c
@@ -148,9 +148,7 @@ SecurityLabelInitial(void)
static _X_INLINE const char *
SecurityLookupRequestName(ClientPtr client)
{
- int major = ((xReq *)client->requestBuffer)->reqType;
- int minor = MinorOpcodeOfRequest(client);
- return LookupRequestName(major, minor);
+ return LookupRequestName(client->majorOp, client->minorOp);
}
diff --git a/Xext/xselinux_hooks.c b/Xext/xselinux_hooks.c
index f1d8e5d..0d4c9ab 100644
--- a/Xext/xselinux_hooks.c
+++ b/Xext/xselinux_hooks.c
@@ -263,8 +263,8 @@ SELinuxAudit(void *auditdata,
if (client) {
REQUEST(xReq);
if (stuff) {
- major = stuff->reqType;
- minor = MinorOpcodeOfRequest(client);
+ major = client->majorOp;
+ minor = client->minorOp;
}
}
if (audit->id)
diff --git a/dix/dispatch.c b/dix/dispatch.c
index 6e33615..b39271f 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -337,8 +337,6 @@ DisableLimitedSchedulingLatency(void)
SmartScheduleLatencyLimited = 0;
}
-#define MAJOROP ((xReq *)client->requestBuffer)->reqType
-
void
Dispatch(void)
{
@@ -419,21 +417,28 @@ Dispatch(void)
}
client->sequence++;
+ client->majorOp = ((xReq *)client->requestBuffer)->reqType;
+ client->minorOp = 0;
+ if (client->majorOp >= EXTENSION_BASE) {
+ ExtensionEntry *ext = GetExtensionEntry(client->majorOp);
+ if (ext)
+ client->minorOp = ext->MinorOpcode(client);
+ }
#ifdef XSERVER_DTRACE
- XSERVER_REQUEST_START(LookupMajorName(MAJOROP), MAJOROP,
+ XSERVER_REQUEST_START(LookupMajorName(client->majorOp), client->majorOp,
((xReq *)client->requestBuffer)->length,
client->index, client->requestBuffer);
#endif
if (result > (maxBigRequestSize << 2))
result = BadLength;
else {
- result = XaceHookDispatch(client, MAJOROP);
+ result = XaceHookDispatch(client, client->majorOp);
if (result == Success)
- result = (* client->requestVector[MAJOROP])(client);
+ result = (* client->requestVector[client->majorOp])(client);
XaceHookAuditEnd(client, result);
}
#ifdef XSERVER_DTRACE
- XSERVER_REQUEST_DONE(LookupMajorName(MAJOROP), MAJOROP,
+ XSERVER_REQUEST_DONE(LookupMajorName(client->majorOp), client->majorOp,
client->sequence, client->index, result);
#endif
@@ -444,8 +449,8 @@ Dispatch(void)
}
else if (result != Success)
{
- SendErrorToClient(client, MAJOROP,
- MinorOpcodeOfRequest(client),
+ SendErrorToClient(client, client->majorOp,
+ client->minorOp,
client->errorValue, result);
break;
}
@@ -466,8 +471,6 @@ Dispatch(void)
SmartScheduleLatencyLimited = 0;
}
-#undef MAJOROP
-
static int VendorRelease = VENDOR_RELEASE;
static char *VendorString = VENDOR_NAME;
diff --git a/dix/extension.c b/dix/extension.c
index c7bbac5..b677cdb 100644
--- a/dix/extension.c
+++ b/dix/extension.c
@@ -228,20 +228,6 @@ StandardMinorOpcode(ClientPtr client)
return ((xReq *)client->requestBuffer)->data;
}
-unsigned short
-MinorOpcodeOfRequest(ClientPtr client)
-{
- unsigned char major;
-
- major = ((xReq *)client->requestBuffer)->reqType;
- if (major < EXTENSION_BASE)
- return 0;
- major -= EXTENSION_BASE;
- if (major >= NumExtensions)
- return 0;
- return (*extensions[major]->MinorOpcode)(client);
-}
-
void
CloseDownExtensions(void)
{
diff --git a/include/dixstruct.h b/include/dixstruct.h
index 6cc9614..0a85f40 100644
--- a/include/dixstruct.h
+++ b/include/dixstruct.h
@@ -122,6 +122,7 @@ typedef struct _Client {
DeviceIntPtr clientPtr;
ClientIdPtr clientIds;
+ unsigned short majorOp, minorOp;
} ClientRec;
/*
diff --git a/include/extension.h b/include/extension.h
index 29a11c3..9249951 100644
--- a/include/extension.h
+++ b/include/extension.h
@@ -52,8 +52,6 @@ _XFUNCPROTOBEGIN
extern _X_EXPORT unsigned short StandardMinorOpcode(ClientPtr /*client*/);
-extern _X_EXPORT unsigned short MinorOpcodeOfRequest(ClientPtr /*client*/);
-
extern _X_EXPORT Bool EnableDisableExtension(char *name, Bool enable);
extern _X_EXPORT void EnableDisableExtensionError(char *name, Bool enable);
diff --git a/record/record.c b/record/record.c
index 68311ac..4a0fe23 100644
--- a/record/record.c
+++ b/record/record.c
@@ -546,7 +546,7 @@ RecordARequest(ClientPtr client)
}
else /* extension, check minor opcode */
{
- int minorop = MinorOpcodeOfRequest(client);
+ int minorop = client->minorOp;
int numMinOpInfo;
RecordMinorOpPtr pMinorOpInfo = pRCAP->pRequestMinOpInfo;
@@ -603,12 +603,9 @@ RecordAReply(CallbackListPtr *pcbl, pointer nulldata, pointer calldata)
RecordContextPtr pContext;
RecordClientsAndProtocolPtr pRCAP;
int eci;
- int majorop;
ReplyInfoRec *pri = (ReplyInfoRec *)calldata;
ClientPtr client = pri->client;
- REQUEST(xReq);
- majorop = stuff->reqType;
for (eci = 0; eci < numEnabledContexts; eci++)
{
pContext = ppAllContexts[eci];
@@ -616,6 +613,7 @@ RecordAReply(CallbackListPtr *pcbl, pointer nulldata, pointer calldata)
NULL);
if (pRCAP)
{
+ int majorop = client->majorOp;
if (pContext->continuedReply)
{
RecordAProtocolElement(pContext, client, XRecordFromServer,
@@ -635,7 +633,7 @@ RecordAReply(CallbackListPtr *pcbl, pointer nulldata, pointer calldata)
}
else /* extension, check minor opcode */
{
- int minorop = MinorOpcodeOfRequest(client);
+ int minorop = client->minorOp;
int numMinOpInfo;
RecordMinorOpPtr pMinorOpInfo = pRCAP->pReplyMinOpInfo;
assert (pMinorOpInfo);
--
1.7.7
--
keith.packard at intel.com
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