738 lines
23 KiB
C
738 lines
23 KiB
C
/*
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* BIGFONT extension for sharing font metrics between clients (if possible)
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* and for transmitting font metrics to clients in a compressed form.
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*
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* Copyright (c) 1999-2000 Bruno Haible
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* Copyright (c) 1999-2000 The XFree86 Project, Inc.
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*/
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/* THIS IS NOT AN X CONSORTIUM STANDARD */
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/*
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* Big fonts suffer from the following: All clients that have opened a
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* font can access the complete glyph metrics array (the XFontStruct member
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* `per_char') directly, without going through a macro. Moreover these
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* glyph metrics are ink metrics, i.e. are not redundant even for a
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* fixed-width font. For a Unicode font, the size of this array is 768 KB.
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*
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* Problems: 1. It eats a lot of memory in each client. 2. All this glyph
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* metrics data is piped through the socket when the font is opened.
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*
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* This extension addresses these two problems for local clients, by using
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* shared memory. It also addresses the second problem for non-local clients,
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* by compressing the data before transmit by a factor of nearly 6.
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*
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* If you use this extension, your OS ought to nicely support shared memory.
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* This means: Shared memory should be swappable to the swap, and the limits
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* should be high enough (SHMMNI at least 64, SHMMAX at least 768 KB,
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* SHMALL at least 48 MB). It is a plus if your OS allows shmat() calls
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* on segments that have already been marked "removed", because it permits
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* these segments to be cleaned up by the OS if the X server is killed with
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* signal SIGKILL.
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*
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* This extension is transparently exploited by Xlib (functions XQueryFont,
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* XLoadQueryFont).
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <sys/types.h>
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#ifdef HAS_SHM
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#if defined(linux) && (!defined(__GNU_LIBRARY__) || __GNU_LIBRARY__ < 2)
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/* libc4 does not define __GNU_LIBRARY__, libc5 defines __GNU_LIBRARY__ as 1 */
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/* Linux libc4 and libc5 only (because glibc doesn't include kernel headers):
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Linux 2.0.x and 2.2.x define SHMLBA as PAGE_SIZE, but forget to define
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PAGE_SIZE. It is defined in <asm/page.h>. */
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#include <asm/page.h>
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#endif
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#ifdef SVR4
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#include <sys/sysmacros.h>
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#endif
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#if defined(__CYGWIN__)
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#include <sys/param.h>
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#include <sys/sysmacros.h>
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#endif
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <errno.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xproto.h>
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#include "misc.h"
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#include "os.h"
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#include "dixstruct.h"
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#include "gcstruct.h"
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#include "dixfontstr.h"
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#include "extnsionst.h"
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#include "extinit.h"
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#include "protocol-versions.h"
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#include <X11/extensions/xf86bigfproto.h>
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#include "xf86bigfontsrv.h"
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static void XF86BigfontResetProc(ExtensionEntry * /* extEntry */
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);
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#ifdef HAS_SHM
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/* A random signature, transmitted to the clients so they can verify that the
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shared memory segment they are attaching to was really established by the
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X server they are talking to. */
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static CARD32 signature;
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/* Index for additional information stored in a FontRec's devPrivates array. */
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static int FontShmdescIndex;
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static unsigned int pagesize;
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static Bool badSysCall = FALSE;
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__) || defined(__DragonFly__)
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static void
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SigSysHandler(int signo)
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{
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badSysCall = TRUE;
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}
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static Bool
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CheckForShmSyscall(void)
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{
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void (*oldHandler) (int);
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int shmid = -1;
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/* If no SHM support in the kernel, the bad syscall will generate SIGSYS */
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oldHandler = OsSignal(SIGSYS, SigSysHandler);
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badSysCall = FALSE;
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shmid = shmget(IPC_PRIVATE, 4096, IPC_CREAT);
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if (shmid != -1) {
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/* Successful allocation - clean up */
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shmctl(shmid, IPC_RMID, NULL);
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}
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else {
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/* Allocation failed */
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badSysCall = TRUE;
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}
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OsSignal(SIGSYS, oldHandler);
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return !badSysCall;
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}
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#define MUST_CHECK_FOR_SHM_SYSCALL
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#endif
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#endif
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/* ========== Management of shared memory segments ========== */
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#ifdef HAS_SHM
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#ifdef __linux__
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/* On Linux, shared memory marked as "removed" can still be attached.
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Nice feature, because the kernel will automatically free the associated
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storage when the server and all clients are gone. */
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#define EARLY_REMOVE
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#endif
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typedef struct _ShmDesc {
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struct _ShmDesc *next;
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struct _ShmDesc **prev;
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int shmid;
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char *attach_addr;
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} ShmDescRec, *ShmDescPtr;
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static ShmDescPtr ShmList = (ShmDescPtr) NULL;
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static ShmDescPtr
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shmalloc(unsigned int size)
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{
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ShmDescPtr pDesc;
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int shmid;
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char *addr;
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#ifdef MUST_CHECK_FOR_SHM_SYSCALL
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if (pagesize == 0)
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return (ShmDescPtr) NULL;
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#endif
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/* On some older Linux systems, the number of shared memory segments
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system-wide is 127. In Linux 2.4, it is 4095.
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Therefore there is a tradeoff to be made between allocating a
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shared memory segment on one hand, and allocating memory and piping
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the glyph metrics on the other hand. If the glyph metrics size is
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small, we prefer the traditional way. */
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if (size < 3500)
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return (ShmDescPtr) NULL;
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pDesc = malloc(sizeof(ShmDescRec));
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if (!pDesc)
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return (ShmDescPtr) NULL;
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size = (size + pagesize - 1) & -pagesize;
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shmid = shmget(IPC_PRIVATE, size, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH);
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if (shmid == -1) {
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ErrorF(XF86BIGFONTNAME " extension: shmget() failed, size = %u, %s\n",
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size, strerror(errno));
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free(pDesc);
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return (ShmDescPtr) NULL;
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}
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if ((addr = shmat(shmid, 0, 0)) == (char *) -1) {
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ErrorF(XF86BIGFONTNAME " extension: shmat() failed, size = %u, %s\n",
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size, strerror(errno));
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shmctl(shmid, IPC_RMID, (void *) 0);
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free(pDesc);
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return (ShmDescPtr) NULL;
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}
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#ifdef EARLY_REMOVE
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shmctl(shmid, IPC_RMID, (void *) 0);
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#endif
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pDesc->shmid = shmid;
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pDesc->attach_addr = addr;
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if (ShmList)
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ShmList->prev = &pDesc->next;
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pDesc->next = ShmList;
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pDesc->prev = &ShmList;
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ShmList = pDesc;
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return pDesc;
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}
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static void
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shmdealloc(ShmDescPtr pDesc)
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{
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#ifndef EARLY_REMOVE
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shmctl(pDesc->shmid, IPC_RMID, (void *) 0);
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#endif
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shmdt(pDesc->attach_addr);
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if (pDesc->next)
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pDesc->next->prev = pDesc->prev;
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*pDesc->prev = pDesc->next;
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free(pDesc);
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}
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#endif
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/* Called when a font is closed. */
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void
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XF86BigfontFreeFontShm(FontPtr pFont)
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{
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#ifdef HAS_SHM
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ShmDescPtr pDesc;
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/* If during shutdown of the server, XF86BigfontCleanup() has already
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* called shmdealloc() for all segments, we don't need to do it here.
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*/
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if (!ShmList)
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return;
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pDesc = (ShmDescPtr) FontGetPrivate(pFont, FontShmdescIndex);
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if (pDesc)
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shmdealloc(pDesc);
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#endif
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}
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/* Called upon fatal signal. */
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void
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XF86BigfontCleanup(void)
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{
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#ifdef HAS_SHM
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while (ShmList)
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shmdealloc(ShmList);
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#endif
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}
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/* Called when a server generation dies. */
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static void
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XF86BigfontResetProc(ExtensionEntry * extEntry)
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{
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/* This function is normally called from CloseDownExtensions(), called
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* from main(). It will be followed by a call to FreeAllResources(),
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* which will call XF86BigfontFreeFontShm() for each font. Thus it
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* appears that we do not need to do anything in this function. --
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* But I prefer to write robust code, and not keep shared memory lying
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* around when it's not needed any more. (Someone might close down the
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* extension without calling FreeAllResources()...)
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*/
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XF86BigfontCleanup();
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}
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/* ========== Handling of extension specific requests ========== */
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static int
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ProcXF86BigfontQueryVersion(ClientPtr client)
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{
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xXF86BigfontQueryVersionReply reply;
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REQUEST_SIZE_MATCH(xXF86BigfontQueryVersionReq);
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reply = (xXF86BigfontQueryVersionReply) {
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.type = X_Reply,
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.sequenceNumber = client->sequence,
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.length = 0,
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.majorVersion = SERVER_XF86BIGFONT_MAJOR_VERSION,
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.minorVersion = SERVER_XF86BIGFONT_MINOR_VERSION,
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.uid = geteuid(),
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.gid = getegid(),
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#ifdef HAS_SHM
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.signature = signature,
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.capabilities = (client->local && !client->swapped)
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? XF86Bigfont_CAP_LocalShm : 0
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#else
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.signature = 0,
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.capabilities = 0
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#endif
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};
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if (client->swapped) {
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swaps(&reply.sequenceNumber);
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swapl(&reply.length);
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swaps(&reply.majorVersion);
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swaps(&reply.minorVersion);
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swapl(&reply.uid);
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swapl(&reply.gid);
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swapl(&reply.signature);
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}
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WriteToClient(client, sizeof(xXF86BigfontQueryVersionReply), &reply);
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return Success;
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}
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static void
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swapCharInfo(xCharInfo * pCI)
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{
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swaps(&pCI->leftSideBearing);
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swaps(&pCI->rightSideBearing);
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swaps(&pCI->characterWidth);
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swaps(&pCI->ascent);
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swaps(&pCI->descent);
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swaps(&pCI->attributes);
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}
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/* static CARD32 hashCI (xCharInfo *p); */
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#define hashCI(p) \
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(CARD32)(((p->leftSideBearing << 27) + (p->leftSideBearing >> 5) + \
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(p->rightSideBearing << 23) + (p->rightSideBearing >> 9) + \
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(p->characterWidth << 16) + \
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(p->ascent << 11) + (p->descent << 6)) ^ p->attributes)
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static int
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ProcXF86BigfontQueryFont(ClientPtr client)
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{
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FontPtr pFont;
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REQUEST(xXF86BigfontQueryFontReq);
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CARD32 stuff_flags;
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xCharInfo *pmax;
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xCharInfo *pmin;
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int nCharInfos;
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int shmid;
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#ifdef HAS_SHM
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ShmDescPtr pDesc = NULL;
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#else
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#define pDesc 0
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#endif
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xCharInfo *pCI;
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CARD16 *pIndex2UniqIndex;
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CARD16 *pUniqIndex2Index;
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CARD32 nUniqCharInfos;
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#if 0
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REQUEST_SIZE_MATCH(xXF86BigfontQueryFontReq);
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#else
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switch (client->req_len) {
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case 2: /* client with version 1.0 libX11 */
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stuff_flags = (client->local &&
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!client->swapped ? XF86Bigfont_FLAGS_Shm : 0);
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break;
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case 3: /* client with version 1.1 libX11 */
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stuff_flags = stuff->flags;
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break;
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default:
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return BadLength;
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}
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#endif
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if (dixLookupFontable(&pFont, stuff->id, client, DixGetAttrAccess) !=
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Success)
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return BadFont; /* procotol spec says only error is BadFont */
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pmax = FONTINKMAX(pFont);
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pmin = FONTINKMIN(pFont);
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nCharInfos =
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(pmax->rightSideBearing == pmin->rightSideBearing
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&& pmax->leftSideBearing == pmin->leftSideBearing
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&& pmax->descent == pmin->descent
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&& pmax->ascent == pmin->ascent
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&& pmax->characterWidth == pmin->characterWidth)
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? 0 : N2dChars(pFont);
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shmid = -1;
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pCI = NULL;
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pIndex2UniqIndex = NULL;
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pUniqIndex2Index = NULL;
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nUniqCharInfos = 0;
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if (nCharInfos > 0) {
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#ifdef HAS_SHM
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if (!badSysCall)
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pDesc = (ShmDescPtr) FontGetPrivate(pFont, FontShmdescIndex);
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if (pDesc) {
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pCI = (xCharInfo *) pDesc->attach_addr;
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if (stuff_flags & XF86Bigfont_FLAGS_Shm)
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shmid = pDesc->shmid;
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}
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else {
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if (stuff_flags & XF86Bigfont_FLAGS_Shm && !badSysCall)
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pDesc = shmalloc(nCharInfos * sizeof(xCharInfo)
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+ sizeof(CARD32));
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if (pDesc) {
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pCI = (xCharInfo *) pDesc->attach_addr;
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shmid = pDesc->shmid;
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}
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else {
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#endif
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pCI = xallocarray(nCharInfos, sizeof(xCharInfo));
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if (!pCI)
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return BadAlloc;
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#ifdef HAS_SHM
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}
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#endif
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/* Fill nCharInfos starting at pCI. */
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{
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xCharInfo *prCI = pCI;
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int ninfos = 0;
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int ncols = pFont->info.lastCol - pFont->info.firstCol + 1;
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int row;
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for (row = pFont->info.firstRow;
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row <= pFont->info.lastRow && ninfos < nCharInfos; row++) {
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unsigned char chars[512];
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xCharInfo *tmpCharInfos[256];
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unsigned long count;
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int col;
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unsigned long i;
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i = 0;
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for (col = pFont->info.firstCol;
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col <= pFont->info.lastCol; col++) {
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chars[i++] = row;
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chars[i++] = col;
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}
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(*pFont->get_metrics) (pFont, ncols, chars, TwoD16Bit,
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&count, tmpCharInfos);
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for (i = 0; i < count && ninfos < nCharInfos; i++) {
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*prCI++ = *tmpCharInfos[i];
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ninfos++;
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}
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}
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}
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#ifdef HAS_SHM
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if (pDesc && !badSysCall) {
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*(CARD32 *) (pCI + nCharInfos) = signature;
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if (!xfont2_font_set_private(pFont, FontShmdescIndex, pDesc)) {
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shmdealloc(pDesc);
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return BadAlloc;
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}
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}
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}
|
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#endif
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if (shmid == -1) {
|
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/* Cannot use shared memory, so remove-duplicates the xCharInfos
|
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using a temporary hash table. */
|
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/* Note that CARD16 is suitable as index type, because
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nCharInfos <= 0x10000. */
|
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CARD32 hashModulus;
|
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CARD16 *pHash2UniqIndex;
|
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CARD16 *pUniqIndex2NextUniqIndex;
|
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CARD32 NextIndex;
|
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CARD32 NextUniqIndex;
|
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CARD16 *tmp;
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CARD32 i, j;
|
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|
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hashModulus = 67;
|
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if (hashModulus > nCharInfos + 1)
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hashModulus = nCharInfos + 1;
|
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|
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tmp = xallocarray(4 * nCharInfos + 1, sizeof(CARD16));
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if (!tmp) {
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if (!pDesc)
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free(pCI);
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return BadAlloc;
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}
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pIndex2UniqIndex = tmp;
|
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/* nCharInfos elements */
|
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pUniqIndex2Index = tmp + nCharInfos;
|
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/* max. nCharInfos elements */
|
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pUniqIndex2NextUniqIndex = tmp + 2 * nCharInfos;
|
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/* max. nCharInfos elements */
|
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pHash2UniqIndex = tmp + 3 * nCharInfos;
|
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/* hashModulus (<= nCharInfos+1) elements */
|
|
|
|
/* Note that we can use 0xffff as end-of-list indicator, because
|
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even if nCharInfos = 0x10000, 0xffff can not occur as valid
|
|
entry before the last element has been inserted. And once the
|
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last element has been inserted, we don't need the hash table
|
|
any more. */
|
|
for (j = 0; j < hashModulus; j++)
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pHash2UniqIndex[j] = (CARD16) (-1);
|
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|
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NextUniqIndex = 0;
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for (NextIndex = 0; NextIndex < nCharInfos; NextIndex++) {
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xCharInfo *p = &pCI[NextIndex];
|
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CARD32 hashCode = hashCI(p) % hashModulus;
|
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|
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for (i = pHash2UniqIndex[hashCode];
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i != (CARD16) (-1); i = pUniqIndex2NextUniqIndex[i]) {
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j = pUniqIndex2Index[i];
|
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if (pCI[j].leftSideBearing == p->leftSideBearing
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&& pCI[j].rightSideBearing == p->rightSideBearing
|
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&& pCI[j].characterWidth == p->characterWidth
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&& pCI[j].ascent == p->ascent
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&& pCI[j].descent == p->descent
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&& pCI[j].attributes == p->attributes)
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break;
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}
|
|
if (i != (CARD16) (-1)) {
|
|
/* Found *p at Index j, UniqIndex i */
|
|
pIndex2UniqIndex[NextIndex] = i;
|
|
}
|
|
else {
|
|
/* Allocate a new entry in the Uniq table */
|
|
if (hashModulus <= 2 * NextUniqIndex
|
|
&& hashModulus < nCharInfos + 1) {
|
|
/* Time to increate hash table size */
|
|
hashModulus = 2 * hashModulus + 1;
|
|
if (hashModulus > nCharInfos + 1)
|
|
hashModulus = nCharInfos + 1;
|
|
for (j = 0; j < hashModulus; j++)
|
|
pHash2UniqIndex[j] = (CARD16) (-1);
|
|
for (i = 0; i < NextUniqIndex; i++)
|
|
pUniqIndex2NextUniqIndex[i] = (CARD16) (-1);
|
|
for (i = 0; i < NextUniqIndex; i++) {
|
|
j = pUniqIndex2Index[i];
|
|
p = &pCI[j];
|
|
hashCode = hashCI(p) % hashModulus;
|
|
pUniqIndex2NextUniqIndex[i] =
|
|
pHash2UniqIndex[hashCode];
|
|
pHash2UniqIndex[hashCode] = i;
|
|
}
|
|
p = &pCI[NextIndex];
|
|
hashCode = hashCI(p) % hashModulus;
|
|
}
|
|
i = NextUniqIndex++;
|
|
pUniqIndex2NextUniqIndex[i] = pHash2UniqIndex[hashCode];
|
|
pHash2UniqIndex[hashCode] = i;
|
|
pUniqIndex2Index[i] = NextIndex;
|
|
pIndex2UniqIndex[NextIndex] = i;
|
|
}
|
|
}
|
|
nUniqCharInfos = NextUniqIndex;
|
|
/* fprintf(stderr, "font metrics: nCharInfos = %d, nUniqCharInfos = %d, hashModulus = %d\n", nCharInfos, nUniqCharInfos, hashModulus); */
|
|
}
|
|
}
|
|
|
|
{
|
|
int nfontprops = pFont->info.nprops;
|
|
int rlength = sizeof(xXF86BigfontQueryFontReply)
|
|
+ nfontprops * sizeof(xFontProp)
|
|
+ (nCharInfos > 0 && shmid == -1
|
|
? nUniqCharInfos * sizeof(xCharInfo)
|
|
+ (nCharInfos + 1) / 2 * 2 * sizeof(CARD16)
|
|
: 0);
|
|
xXF86BigfontQueryFontReply *reply = calloc(1, rlength);
|
|
char *p;
|
|
|
|
if (!reply) {
|
|
if (nCharInfos > 0) {
|
|
if (shmid == -1)
|
|
free(pIndex2UniqIndex);
|
|
if (!pDesc)
|
|
free(pCI);
|
|
}
|
|
return BadAlloc;
|
|
}
|
|
reply->type = X_Reply;
|
|
reply->length = bytes_to_int32(rlength - sizeof(xGenericReply));
|
|
reply->sequenceNumber = client->sequence;
|
|
reply->minBounds = pFont->info.ink_minbounds;
|
|
reply->maxBounds = pFont->info.ink_maxbounds;
|
|
reply->minCharOrByte2 = pFont->info.firstCol;
|
|
reply->maxCharOrByte2 = pFont->info.lastCol;
|
|
reply->defaultChar = pFont->info.defaultCh;
|
|
reply->nFontProps = pFont->info.nprops;
|
|
reply->drawDirection = pFont->info.drawDirection;
|
|
reply->minByte1 = pFont->info.firstRow;
|
|
reply->maxByte1 = pFont->info.lastRow;
|
|
reply->allCharsExist = pFont->info.allExist;
|
|
reply->fontAscent = pFont->info.fontAscent;
|
|
reply->fontDescent = pFont->info.fontDescent;
|
|
reply->nCharInfos = nCharInfos;
|
|
reply->nUniqCharInfos = nUniqCharInfos;
|
|
reply->shmid = shmid;
|
|
reply->shmsegoffset = 0;
|
|
if (client->swapped) {
|
|
swaps(&reply->sequenceNumber);
|
|
swapl(&reply->length);
|
|
swapCharInfo(&reply->minBounds);
|
|
swapCharInfo(&reply->maxBounds);
|
|
swaps(&reply->minCharOrByte2);
|
|
swaps(&reply->maxCharOrByte2);
|
|
swaps(&reply->defaultChar);
|
|
swaps(&reply->nFontProps);
|
|
swaps(&reply->fontAscent);
|
|
swaps(&reply->fontDescent);
|
|
swapl(&reply->nCharInfos);
|
|
swapl(&reply->nUniqCharInfos);
|
|
swapl(&reply->shmid);
|
|
swapl(&reply->shmsegoffset);
|
|
}
|
|
p = (char *) &reply[1];
|
|
{
|
|
FontPropPtr pFP;
|
|
xFontProp *prFP;
|
|
int i;
|
|
|
|
for (i = 0, pFP = pFont->info.props, prFP = (xFontProp *) p;
|
|
i < nfontprops; i++, pFP++, prFP++) {
|
|
prFP->name = pFP->name;
|
|
prFP->value = pFP->value;
|
|
if (client->swapped) {
|
|
swapl(&prFP->name);
|
|
swapl(&prFP->value);
|
|
}
|
|
}
|
|
p = (char *) prFP;
|
|
}
|
|
if (nCharInfos > 0 && shmid == -1) {
|
|
xCharInfo *pci;
|
|
CARD16 *ps;
|
|
int i, j;
|
|
|
|
pci = (xCharInfo *) p;
|
|
for (i = 0; i < nUniqCharInfos; i++, pci++) {
|
|
*pci = pCI[pUniqIndex2Index[i]];
|
|
if (client->swapped)
|
|
swapCharInfo(pci);
|
|
}
|
|
ps = (CARD16 *) pci;
|
|
for (j = 0; j < nCharInfos; j++, ps++) {
|
|
*ps = pIndex2UniqIndex[j];
|
|
if (client->swapped) {
|
|
swaps(ps);
|
|
}
|
|
}
|
|
}
|
|
WriteToClient(client, rlength, reply);
|
|
free(reply);
|
|
if (nCharInfos > 0) {
|
|
if (shmid == -1)
|
|
free(pIndex2UniqIndex);
|
|
if (!pDesc)
|
|
free(pCI);
|
|
}
|
|
return Success;
|
|
}
|
|
}
|
|
|
|
static int
|
|
ProcXF86BigfontDispatch(ClientPtr client)
|
|
{
|
|
REQUEST(xReq);
|
|
|
|
switch (stuff->data) {
|
|
case X_XF86BigfontQueryVersion:
|
|
return ProcXF86BigfontQueryVersion(client);
|
|
case X_XF86BigfontQueryFont:
|
|
return ProcXF86BigfontQueryFont(client);
|
|
default:
|
|
return BadRequest;
|
|
}
|
|
}
|
|
|
|
static int
|
|
SProcXF86BigfontQueryVersion(ClientPtr client)
|
|
{
|
|
REQUEST(xXF86BigfontQueryVersionReq);
|
|
|
|
swaps(&stuff->length);
|
|
return ProcXF86BigfontQueryVersion(client);
|
|
}
|
|
|
|
static int
|
|
SProcXF86BigfontQueryFont(ClientPtr client)
|
|
{
|
|
REQUEST(xXF86BigfontQueryFontReq);
|
|
|
|
swaps(&stuff->length);
|
|
REQUEST_SIZE_MATCH(xXF86BigfontQueryFontReq);
|
|
swapl(&stuff->id);
|
|
return ProcXF86BigfontQueryFont(client);
|
|
}
|
|
|
|
static int
|
|
SProcXF86BigfontDispatch(ClientPtr client)
|
|
{
|
|
REQUEST(xReq);
|
|
|
|
switch (stuff->data) {
|
|
case X_XF86BigfontQueryVersion:
|
|
return SProcXF86BigfontQueryVersion(client);
|
|
case X_XF86BigfontQueryFont:
|
|
return SProcXF86BigfontQueryFont(client);
|
|
default:
|
|
return BadRequest;
|
|
}
|
|
}
|
|
|
|
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 = xfont2_allocate_font_private_index();
|
|
|
|
#if !defined(CSRG_BASED) && !defined(__CYGWIN__)
|
|
pagesize = SHMLBA;
|
|
#else
|
|
#ifdef _SC_PAGESIZE
|
|
pagesize = sysconf(_SC_PAGESIZE);
|
|
#else
|
|
pagesize = getpagesize();
|
|
#endif
|
|
#endif
|
|
#endif
|
|
}
|
|
}
|