void
ShmExtensionInit(INITARGS)
{
ExtensionEntry *extEntry;
int i;
#ifdef MUST_CHECK_FOR_SHM_SYSCALL
if (!CheckForShmSyscall())
{
ErrorF("MIT-SHM extension disabled due to lack of kernel support\n");
return;
}
#endif
if (!ShmRegisterPrivates())
return;
sharedPixmaps = xFalse;
{
sharedPixmaps = xTrue;
for (i = 0; i < screenInfo.numScreens; i++)
{
ShmScrPrivateRec *screen_priv = ShmInitScreenPriv(screenInfo.screens[i]);
if (!screen_priv->shmFuncs)
screen_priv->shmFuncs = &miFuncs;
if (!screen_priv->shmFuncs->CreatePixmap)
sharedPixmaps = xFalse;
}
if (sharedPixmaps)
for (i = 0; i < screenInfo.numScreens; i++)
{
ShmScrPrivateRec *screen_priv = ShmGetScreenPriv(screenInfo.screens[i]);
screen_priv->destroyPixmap = screenInfo.screens[i]->DestroyPixmap;
screenInfo.screens[i]->DestroyPixmap = ShmDestroyPixmap;
}
}
ShmSegType = CreateNewResourceType(ShmDetachSegment, "ShmSeg");
if (ShmSegType &&
(extEntry = AddExtension(SHMNAME, ShmNumberEvents, ShmNumberErrors,
ProcShmDispatch, SProcShmDispatch,
ShmResetProc, StandardMinorOpcode)))
{
ShmReqCode = (unsigned char)extEntry->base;
ShmCompletionCode = extEntry->eventBase;
BadShmSegCode = extEntry->errorBase;
SetResourceTypeErrorValue(ShmSegType, BadShmSegCode);
EventSwapVector[ShmCompletionCode] = (EventSwapPtr) SShmCompletionEvent;
}
}
void
XFree86BigfontExtensionInit(void)
{
if (AddExtension(XF86BIGFONTNAME,
XF86BigfontNumberEvents,
XF86BigfontNumberErrors,
ProcXF86BigfontDispatch,
SProcXF86BigfontDispatch,
XF86BigfontResetProc,
StandardMinorOpcode)) {
#ifdef HAS_SHM
#ifdef MUST_CHECK_FOR_SHM_SYSCALL
/*
* Note: Local-clients will not be optimized without shared memory
* support. Remote-client optimization does not depend on shared
* memory support. Thus, the extension is still registered even
* when shared memory support is not functional.
*/
if (!CheckForShmSyscall()) {
ErrorF(XF86BIGFONTNAME " extension local-client optimization disabled due to lack of shared memory support in the kernel\n");
return;
}
#endif
srand((unsigned int) time(NULL));
signature = ((unsigned int) (65536.0/(RAND_MAX+1.0) * rand()) << 16)
+ (unsigned int) (65536.0/(RAND_MAX+1.0) * rand());
/* fprintf(stderr, "signature = 0x%08X\n", signature); */
FontShmdescIndex = AllocateFontPrivateIndex();
#if !defined(CSRG_BASED) && !defined(__CYGWIN__)
pagesize = SHMLBA;
#else
# ifdef _SC_PAGESIZE
pagesize = sysconf(_SC_PAGESIZE);
# else
pagesize = getpagesize();
# endif
#endif
#endif
}
}
void
XFree86BigfontExtensionInit()
{
ExtensionEntry* extEntry;
if ((extEntry = AddExtension(XF86BIGFONTNAME,
XF86BigfontNumberEvents,
XF86BigfontNumberErrors,
ProcXF86BigfontDispatch,
SProcXF86BigfontDispatch,
XF86BigfontResetProc,
StandardMinorOpcode))) {
XF86BigfontReqCode = (unsigned char) extEntry->base;
#ifdef HAS_SHM
#ifdef MUST_CHECK_FOR_SHM_SYSCALL
if (!CheckForShmSyscall()) {
ErrorF(XF86BIGFONTNAME " extension disabled due to lack of shared memory support in the kernel\n");
return;
}
#endif
srand((unsigned int) time(NULL));
signature = ((unsigned int) (65536.0/(RAND_MAX+1.0) * rand()) << 16)
+ (unsigned int) (65536.0/(RAND_MAX+1.0) * rand());
/* fprintf(stderr, "signature = 0x%08X\n", signature); */
FontShmdescIndex = AllocateFontPrivateIndex();
#if !defined(CSRG_BASED) && !defined(__CYGWIN__)
pagesize = SHMLBA;
#else
# ifdef _SC_PAGESIZE
pagesize = sysconf(_SC_PAGESIZE);
# else
pagesize = getpagesize();
# endif
#endif
#endif
}
}
void
XFree86BigfontExtensionInit()
{
#if 0
ExtensionEntry* extEntry;
if ((extEntry = AddExtension(XF86BIGFONTNAME,
XF86BigfontNumberEvents,
XF86BigfontNumberErrors,
ProcXF86BigfontDispatch,
SProcXF86BigfontDispatch,
XF86BigfontResetProc,
StandardMinorOpcode))) {
XF86BigfontReqCode = (unsigned char) extEntry->base;
#else
if (AddExtension(XF86BIGFONTNAME,
XF86BigfontNumberEvents,
XF86BigfontNumberErrors,
ProcXF86BigfontDispatch,
SProcXF86BigfontDispatch,
XF86BigfontResetProc,
StandardMinorOpcode)) {
#endif
#ifdef HAS_SHM
#ifdef MUST_CHECK_FOR_SHM_SYSCALL
/*
* Note: Local-clients will not be optimized without shared memory
* support. Remote-client optimization does not depend on shared
* memory support. Thus, the extension is still registered even
* when shared memory support is not functional.
*/
if (!CheckForShmSyscall()) {
ErrorF(XF86BIGFONTNAME " extension local-client optimization disabled due to lack of shared memory support in the kernel\n");
return;
}
#endif
srand((unsigned int) time(NULL));
signature = ((unsigned int) (65536.0/(RAND_MAX+1.0) * rand()) << 16)
+ (unsigned int) (65536.0/(RAND_MAX+1.0) * rand());
/* fprintf(stderr, "signature = 0x%08X\n", signature); */
FontShmdescIndex = AllocateFontPrivateIndex();
#if !defined(CSRG_BASED) && !defined(__CYGWIN__)
pagesize = SHMLBA;
#else
# ifdef _SC_PAGESIZE
pagesize = sysconf(_SC_PAGESIZE);
# else
pagesize = getpagesize();
# endif
#endif
#endif
}
}
/* ========== Management of shared memory segments ========== */
#ifdef HAS_SHM
#ifdef __linux__
/* On Linux, shared memory marked as "removed" can still be attached.
Nice feature, because the kernel will automatically free the associated
storage when the server and all clients are gone. */
#define EARLY_REMOVE
#endif
typedef struct _ShmDesc {
struct _ShmDesc *next;
struct _ShmDesc **prev;
int shmid;
char *attach_addr;
} ShmDescRec, *ShmDescPtr;
static ShmDescPtr ShmList = (ShmDescPtr) NULL;
static ShmDescPtr
shmalloc(
unsigned int size)
{
ShmDescPtr pDesc;
int shmid;
char *addr;
#ifdef MUST_CHECK_FOR_SHM_SYSCALL
if (pagesize == 0)
return (ShmDescPtr) NULL;
#endif
/* On some older Linux systems, the number of shared memory segments
system-wide is 127. In Linux 2.4, it is 4095.
Therefore there is a tradeoff to be made between allocating a
shared memory segment on one hand, and allocating memory and piping
the glyph metrics on the other hand. If the glyph metrics size is
small, we prefer the traditional way. */
if (size < 3500)
return (ShmDescPtr) NULL;
pDesc = (ShmDescRec *) xalloc(sizeof(ShmDescRec));
if (!pDesc)
return (ShmDescPtr) NULL;
size = (size + pagesize-1) & -pagesize;
shmid = shmget(IPC_PRIVATE, size, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH);
if (shmid == -1) {
ErrorF(XF86BIGFONTNAME " extension: shmget() failed, size = %u, errno = %d\n",
size, errno);
xfree(pDesc);
return (ShmDescPtr) NULL;
}
if ((addr = shmat(shmid, 0, 0)) == (char *)-1) {
ErrorF(XF86BIGFONTNAME " extension: shmat() failed, size = %u, errno = %d\n",
size, errno);
shmctl(shmid, IPC_RMID, (void *) 0);
xfree(pDesc);
return (ShmDescPtr) NULL;
}
#ifdef EARLY_REMOVE
shmctl(shmid, IPC_RMID, (void *) 0);
#endif
pDesc->shmid = shmid;
pDesc->attach_addr = addr;
if (ShmList) ShmList->prev = &pDesc->next;
pDesc->next = ShmList;
pDesc->prev = &ShmList;
ShmList = pDesc;
return pDesc;
}
