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Implemented first part of XResource extension v1.2: X_XResQueryClientIds

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This patch implements a part of the XResource extension v1.2 (as specified in
http://patchwork.freedesktop.org/patch/2720/ ). The request implemented is
X_XResQueryClientIds.

This patch depends on the feature introduced by
1e933665be "dix: Add facilities for
client ID tracking." .

This latest version also adds Doxygen-formatted comments and takes a better
notice of coding conventions (as in http://www.x.org/wiki/CodingStyle ).

Signed-off-by: Erkki Seppälä <erkki.seppala@vincit.fi>
This commit is contained in:
Erkki Seppälä 2010-11-29 12:40:56 +02:00
parent 80fefc42f5
commit 96864bfa95
2 changed files with 313 additions and 6 deletions
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317
Xext/xres.c
View File

@ -10,6 +10,7 @@
#include <string.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <assert.h>
#include "misc.h"
#include "os.h"
#include "dixstruct.h"
@ -22,6 +23,98 @@
#include "gcstruct.h"
#include "modinit.h"
#include "protocol-versions.h"
#include "client.h"
#include "list.h"
#include "misc.h"
#include <string.h>
/** @brief Holds fragments of responses for ConstructClientIds.
*
* note: there is no consideration for data alignment */
typedef struct {
struct xorg_list l;
int bytes;
/* data follows */
} FragmentList;
/** @brief Holds structure for the generated response to
ProcXResQueryClientIds; used by ConstructClientId* -functions */
typedef struct {
int numIds;
int resultBytes;
struct xorg_list response;
int sentClientMasks[MAXCLIENTS];
} ConstructClientIdCtx;
/** @brief Allocate and add a sequence of bytes at the end of a fragment list.
Call DestroyFragments to release the list.
@param frags A pointer to head of an initialized linked list
@param bytes Number of bytes to allocate
@return Returns a pointer to the allocated non-zeroed region
that is to be filled by the caller. On error (out of memory)
returns NULL and makes no changes to the list.
*/
static void *
AddFragment(struct xorg_list *frags, int bytes)
{
FragmentList *f = malloc(sizeof(FragmentList) + bytes);
if (!f) {
return NULL;
} else {
f->bytes = bytes;
xorg_list_add(&f->l, frags->prev);
return (char*) f + sizeof(*f);
}
}
/** @brief Sends all fragments in the list to the client. Does not
free anything.
@param client The client to send the fragments to
@param frags The head of the list of fragments
*/
static void
WriteFragmentsToClient(ClientPtr client, struct xorg_list *frags)
{
FragmentList *it;
xorg_list_for_each_entry(it, frags, l) {
WriteToClient(client, it->bytes, (char*) it + sizeof(*it));
}
}
/** @brief Frees a list of fragments. Does not free() root node.
@param frags The head of the list of fragments
*/
static void
DestroyFragments(struct xorg_list *frags)
{
FragmentList *it, *tmp;
xorg_list_for_each_entry_safe(it, tmp, frags, l) {
xorg_list_del(&it->l);
free(it);
}
}
/** @brief Constructs a context record for ConstructClientId* functions
to use */
static void
InitConstructClientIdCtx(ConstructClientIdCtx *ctx)
{
ctx->numIds = 0;
ctx->resultBytes = 0;
xorg_list_init(&ctx->response);
memset(ctx->sentClientMasks, 0, sizeof(ctx->sentClientMasks));
}
/** @brief Destroys a context record, releases all memory (except the storage
for *ctx itself) */
static void
DestroyConstructClientIdCtx(ConstructClientIdCtx *ctx)
{
DestroyFragments(&ctx->response);
}
static int
ProcXResQueryVersion(ClientPtr client)
@ -288,6 +381,202 @@ ProcXResQueryClientPixmapBytes(ClientPtr client)
return Success;
}
/** @brief Finds out if a client's information need to be put into the
response; marks client having been handled, if that is the case.
@param client The client to send information about
@param mask The request mask (0 to send everything, otherwise a
bitmask of X_XRes*Mask)
@param ctx The context record that tells which clients and id types
have been already handled
@param sendMask Which id type are we now considering. One of X_XRes*Mask.
@return Returns TRUE if the client information needs to be on the
response, otherwise FALSE.
*/
static Bool
WillConstructMask(ClientPtr client, CARD32 mask,
ConstructClientIdCtx *ctx, int sendMask)
{
if ((!mask || (mask & sendMask))
&& !(ctx->sentClientMasks[client->index] & sendMask)) {
ctx->sentClientMasks[client->index] |= sendMask;
return TRUE;
} else {
return FALSE;
}
}
/** @brief Constructs a response about a single client, based on a certain
client id spec
@param sendClient Which client wishes to receive this answer. Used for
byte endianess.
@param client Which client are we considering.
@param mask The client id spec mask indicating which information
we want about this client.
@param ctx The context record containing the constructed response
and information on which clients and masks have been
already handled.
@return Return TRUE if everything went OK, otherwise FALSE which indicates
a memory allocation problem.
*/
static Bool
ConstructClientIdValue(ClientPtr sendClient, ClientPtr client, CARD32 mask,
ConstructClientIdCtx *ctx)
{
xXResClientIdValue rep;
rep.spec.client = client->clientAsMask;
if (client->swapped) {
swapl (&rep.spec.client);
}
if (WillConstructMask(client, mask, ctx, X_XResClientXIDMask)) {
void *ptr = AddFragment(&ctx->response, sizeof(rep));
if (!ptr) {
return FALSE;
}
rep.spec.mask = X_XResClientXIDMask;
rep.length = 0;
if (sendClient->swapped) {
swapl (&rep.spec.mask);
/* swapl (&rep.length, n); - not required for rep.length = 0 */
}
memcpy(ptr, &rep, sizeof(rep));
ctx->resultBytes += sizeof(rep);
++ctx->numIds;
}
if (WillConstructMask(client, mask, ctx, X_XResLocalClientPIDMask)) {
pid_t pid = GetClientPid(client);
if (pid != -1) {
void *ptr = AddFragment(&ctx->response,
sizeof(rep) + sizeof(CARD32));
CARD32 *value = (void*) ((char*) ptr + sizeof(rep));
if (!ptr) {
return FALSE;
}
rep.spec.mask = X_XResLocalClientPIDMask;
rep.length = 4;
if (sendClient->swapped) {
swapl (&rep.spec.mask);
swapl (&rep.length);
}
if (sendClient->swapped) {
swapl (value);
}
memcpy(ptr, &rep, sizeof(rep));
*value = pid;
ctx->resultBytes += sizeof(rep) + sizeof(CARD32);
++ctx->numIds;
}
}
/* memory allocation errors earlier may return with FALSE */
return TRUE;
}
/** @brief Constructs a response about all clients, based on a client id specs
@param client Which client which we are constructing the response for.
@param numSpecs Number of client id specs in specs
@param specs Client id specs
@return Return Success if everything went OK, otherwise a Bad* (currently
BadAlloc or BadValue)
*/
static int
ConstructClientIds(ClientPtr client,
int numSpecs, xXResClientIdSpec* specs,
ConstructClientIdCtx *ctx)
{
int specIdx;
for (specIdx = 0; specIdx < numSpecs; ++specIdx) {
if (specs[specIdx].client == 0) {
int c;
for (c = 0; c < currentMaxClients; ++c) {
if (clients[c]) {
if (!ConstructClientIdValue(client, clients[c],
specs[specIdx].mask, ctx)) {
return BadAlloc;
}
}
}
} else {
int clientID = CLIENT_ID(specs[specIdx].client);
if ((clientID < currentMaxClients) && clients[clientID]) {
if (!ConstructClientIdValue(client, clients[clientID],
specs[specIdx].mask, ctx)) {
return BadAlloc;
}
}
}
}
/* memory allocation errors earlier may return with BadAlloc */
return Success;
}
/** @brief Response to XResQueryClientIds request introduced in XResProto v1.2
@param client Which client which we are constructing the response for.
@return Returns the value returned from ConstructClientIds with the same
semantics
*/
static int
ProcXResQueryClientIds (ClientPtr client)
{
REQUEST(xXResQueryClientIdsReq);
xXResQueryClientIdsReply rep;
xXResClientIdSpec *specs = (void*) ((char*) stuff + sizeof(*stuff));
int rc;
ConstructClientIdCtx ctx;
InitConstructClientIdCtx(&ctx);
REQUEST_AT_LEAST_SIZE(xXResQueryClientIdsReq);
REQUEST_FIXED_SIZE(xXResQueryClientIdsReq,
stuff->numSpecs * sizeof(specs[0]));
rc = ConstructClientIds(client, stuff->numSpecs, specs, &ctx);
if (rc == Success) {
rep.type = X_Reply;
rep.sequenceNumber = client->sequence;
assert((ctx.resultBytes & 3) == 0);
rep.length = bytes_to_int32(ctx.resultBytes);
rep.numIds = ctx.numIds;
if (client->swapped) {
swaps (&rep.sequenceNumber);
swapl (&rep.length);
swapl (&rep.numIds);
}
WriteToClient(client,sizeof(rep),(char*)&rep);
WriteFragmentsToClient(client, &ctx.response);
}
DestroyConstructClientIdCtx(&ctx);
return rc;
}
static int
ProcResDispatch(ClientPtr client)
{
@ -301,8 +590,12 @@ ProcResDispatch(ClientPtr client)
return ProcXResQueryClientResources(client);
case X_XResQueryClientPixmapBytes:
return ProcXResQueryClientPixmapBytes(client);
default:
break;
case X_XResQueryClientIds:
return ProcXResQueryClientIds(client);
case X_XResQueryResourceBytes:
/* not implemented yet */
return BadRequest;
default: break;
}
return BadRequest;
@ -335,7 +628,17 @@ SProcXResQueryClientPixmapBytes(ClientPtr client)
}
static int
SProcResDispatch(ClientPtr client)
SProcXResQueryClientIds (ClientPtr client)
{
REQUEST(xXResQueryClientIdsReq);
REQUEST_AT_LEAST_SIZE (xXResQueryClientIdsReq);
swapl(&stuff->numSpecs);
return ProcXResQueryClientIds(client);
}
static int
SProcResDispatch (ClientPtr client)
{
REQUEST(xReq);
swaps(&stuff->length);
@ -349,8 +652,12 @@ SProcResDispatch(ClientPtr client)
return SProcXResQueryClientResources(client);
case X_XResQueryClientPixmapBytes:
return SProcXResQueryClientPixmapBytes(client);
default:
break;
case X_XResQueryClientIds:
return SProcXResQueryClientIds(client);
case X_XResQueryResourceBytes:
/* not implemented yet */
return BadRequest;
default: break;
}
return BadRequest;

2
include/protocol-versions.h
View File

@ -135,7 +135,7 @@
/* Resource */
#define SERVER_XRES_MAJOR_VERSION 1
#define SERVER_XRES_MINOR_VERSION 0
#define SERVER_XRES_MINOR_VERSION 2
/* XvMC */
#define SERVER_XVMC_MAJOR_VERSION 1