Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 2427 insertions, 0 deletions

diff --git a/nx-X11/programs/Xserver/os/utils.c b/nx-X11/programs/Xserver/os/utils.c
new file mode 100644
index 000000000..c806621ff
--- /dev/null
+++ b/nx-X11/programs/Xserver/os/utils.c
@@ -0,0 +1,2427 @@
+/* $XdotOrg: xc/programs/Xserver/os/utils.c,v 1.21 2005/11/08 06:33:30 jkj Exp $ */
+/* $Xorg: utils.c,v 1.5 2001/02/09 02:05:24 xorgcvs Exp $ */
+/*
+
+Copyright 1987, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
+Copyright 1994 Quarterdeck Office Systems.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Digital and
+Quarterdeck not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+DIGITAL AND QUARTERDECK DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT
+OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
+OR PERFORMANCE OF THIS SOFTWARE.
+
+*/
+/* $XFree86: xc/programs/Xserver/os/utils.c,v 3.96 2004/01/07 04:16:37 dawes Exp $ */
+
+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NX-X11, NX protocol compression and NX extensions to this software     */
+/* are copyright of NoMachine. Redistribution and use of the present      */
+/* software is allowed according to terms specified in the file LICENSE   */
+/* which comes in the source distribution.                                */
+/*                                                                        */
+/* Check http://www.nomachine.com/licensing.html for applicability.       */
+/*                                                                        */
+/* NX and NoMachine are trademarks of NoMachine S.r.l.                    */
+/*                                                                        */
+/* All rights reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#ifdef __CYGWIN__
+#include <stdlib.h>
+#include <signal.h>
+#endif
+
+#if defined(WIN32) && !defined(__CYGWIN__)
+#include <X11/Xwinsock.h>
+#endif
+#include <X11/Xos.h>
+#include <stdio.h>
+#include "misc.h"
+#include <X11/X.h>
+#include <X11/Xtrans/Xtrans.h>
+#include "input.h"
+#include "dixfont.h"
+#include "osdep.h"
+#ifdef X_POSIX_C_SOURCE
+#define _POSIX_C_SOURCE X_POSIX_C_SOURCE
+#include <signal.h>
+#undef _POSIX_C_SOURCE
+#else
+#if defined(X_NOT_POSIX) || defined(_POSIX_SOURCE)
+#include <signal.h>
+#else
+#define _POSIX_SOURCE
+#include <signal.h>
+#undef _POSIX_SOURCE
+#endif
+#endif
+#ifndef WIN32
+#include <sys/wait.h>
+#endif
+#if !defined(SYSV) && !defined(WIN32) && !defined(Lynx) && !defined(QNX4)
+#include <sys/resource.h>
+#endif
+#include <time.h>
+#include <sys/stat.h>
+#include <ctype.h>    /* for isspace */
+#include <stdarg.h>
+
+#if defined(DGUX)
+#include <sys/resource.h>
+#include <netdb.h>
+#endif
+
+#include <stdlib.h>	/* for malloc() */
+
+#if defined(TCPCONN) || defined(STREAMSCONN)
+# ifndef WIN32
+#  include <netdb.h>
+# endif
+#endif
+
+#include "opaque.h"
+
+#ifdef SMART_SCHEDULE
+#include "dixstruct.h"
+#endif
+
+#ifdef XKB
+#include <X11/extensions/XKBsrv.h>
+#endif
+#ifdef XCSECURITY
+#define _SECURITY_SERVER
+#include <X11/extensions/security.h>
+#endif
+
+#ifdef RENDER
+#include "picture.h"
+#endif
+
+#ifdef XPRINT
+#include "DiPrint.h"
+#endif
+
+Bool noTestExtensions;
+#ifdef BIGREQS
+Bool noBigReqExtension = FALSE;
+#endif
+#ifdef COMPOSITE
+/* COMPOSITE is disabled by default for now until the
+ * interface is stable */
+Bool noCompositeExtension = TRUE;
+#endif
+#ifdef DAMAGE
+Bool noDamageExtension = FALSE;
+#endif
+#ifdef DBE
+Bool noDbeExtension = FALSE;
+#endif
+#ifdef DPSEXT
+Bool noDPSExtension = FALSE;
+#endif
+#ifdef DPMSExtension
+Bool noDPMSExtension = FALSE;
+#endif
+#ifdef EVI
+Bool noEVIExtension = FALSE;
+#endif
+#ifdef FONTCACHE
+Bool noFontCacheExtension = FALSE;
+#endif
+#ifdef GLXEXT
+Bool noGlxExtension = FALSE;
+#endif
+#ifdef LBX
+Bool noLbxExtension = FALSE;
+#endif
+#ifdef SCREENSAVER
+Bool noScreenSaverExtension = FALSE;
+#endif
+#ifdef MITSHM
+Bool noMITShmExtension = FALSE;
+#endif
+#ifdef MITMISC
+Bool noMITMiscExtension = FALSE;
+#endif
+#ifdef MULTIBUFFER
+Bool noMultibufferExtension = FALSE;
+#endif
+#ifdef RANDR
+Bool noRRExtension = FALSE;
+#endif
+#ifdef RENDER
+Bool noRenderExtension = FALSE;
+#endif
+#ifdef SHAPE
+Bool noShapeExtension = FALSE;
+#endif
+#ifdef XCSECURITY
+Bool noSecurityExtension = FALSE;
+#endif
+#ifdef XSYNC
+Bool noSyncExtension = FALSE;
+#endif
+#ifdef TOGCUP
+Bool noXcupExtension = FALSE;
+#endif
+#ifdef RES
+Bool noResExtension = FALSE;
+#endif
+#ifdef XAPPGROUP
+Bool noXagExtension = FALSE;
+#endif
+#ifdef XCMISC
+Bool noXCMiscExtension = FALSE;
+#endif
+#ifdef XEVIE
+/* Xevie is disabled by default for now until the
+ * interface is stable */
+Bool noXevieExtension = TRUE;
+#endif
+#ifdef XF86BIGFONT
+Bool noXFree86BigfontExtension = FALSE;
+#endif
+#ifdef XFreeXDGA
+Bool noXFree86DGAExtension = FALSE;
+#endif
+#ifdef XF86DRI
+Bool noXFree86DRIExtension = FALSE;
+#endif
+#ifdef XF86MISC
+Bool noXFree86MiscExtension = FALSE;
+#endif
+#ifdef XF86VIDMODE
+Bool noXFree86VidModeExtension = FALSE;
+#endif
+#ifdef XFIXES
+Bool noXFixesExtension = FALSE;
+#endif
+/* |noXkbExtension| is defined in xc/programs/Xserver/xkb/xkbInit.c */
+#ifdef PANORAMIX
+/* Xinerama is disabled by default unless enabled via +xinerama */
+Bool noPanoramiXExtension = TRUE;
+#endif
+#ifdef XINPUT
+Bool noXInputExtension = FALSE;
+#endif
+#ifdef XIDLE
+Bool noXIdleExtension = FALSE;
+#endif
+#ifdef XV
+Bool noXvExtension = FALSE;
+#endif
+
+#define X_INCLUDE_NETDB_H
+#include <X11/Xos_r.h>
+
+#include <errno.h>
+
+#ifdef NX_TRANS_SOCKET
+
+#include "NX.h"
+#include "NXvars.h"
+
+#endif
+
+#ifdef NX_TRANS_EXIT
+
+void (*OsVendorStartRedirectErrorFProc)() = NULL;
+void (*OsVendorEndRedirectErrorFProc)() = NULL;
+
+#endif
+
+Bool CoreDump;
+
+#ifdef PANORAMIX
+Bool PanoramiXVisibilityNotifySent = FALSE;
+Bool PanoramiXMapped = FALSE;
+Bool PanoramiXWindowExposureSent = FALSE;
+Bool PanoramiXOneExposeRequest = FALSE;
+Bool PanoramiXExtensionDisabledHack = FALSE;
+#endif
+
+int auditTrailLevel = 1;
+
+Bool Must_have_memory = FALSE;
+
+#ifdef AIXV3
+int SyncOn  = 0;
+extern int SelectWaitTime;
+#endif
+
+#ifdef DEBUG
+#ifndef SPECIAL_MALLOC
+#define MEMBUG
+#endif
+#endif
+
+#if defined(SVR4) || defined(__linux__) || defined(CSRG_BASED)
+#define HAS_SAVED_IDS_AND_SETEUID
+#endif
+
+#ifdef MEMBUG
+#define MEM_FAIL_SCALE 100000
+long Memory_fail = 0;
+#include <stdlib.h>  /* for random() */
+#endif
+
+#ifdef sgi
+int userdefinedfontpath = 0;
+#endif /* sgi */
+
+char *dev_tty_from_init = NULL;		/* since we need to parse it anyway */
+
+extern char dispatchExceptionAtReset;
+
+/* Extension enable/disable in miinitext.c */
+extern Bool EnableDisableExtension(char *name, Bool enable);
+extern void EnableDisableExtensionError(char *name, Bool enable);
+
+OsSigHandlerPtr
+OsSignal(sig, handler)
+    int sig;
+    OsSigHandlerPtr handler;
+{
+#ifdef X_NOT_POSIX
+    return signal(sig, handler);
+#else
+    struct sigaction act, oact;
+
+    sigemptyset(&act.sa_mask);
+    if (handler != SIG_IGN)
+	sigaddset(&act.sa_mask, sig);
+    act.sa_flags = 0;
+    act.sa_handler = handler;
+    sigaction(sig, &act, &oact);
+    return oact.sa_handler;
+#endif
+}
+	
+#ifdef SERVER_LOCK
+/*
+ * Explicit support for a server lock file like the ones used for UUCP.
+ * For architectures with virtual terminals that can run more than one
+ * server at a time.  This keeps the servers from stomping on each other
+ * if the user forgets to give them different display numbers.
+ */
+#ifndef __UNIXOS2__
+#define LOCK_DIR "/tmp"
+#endif
+#define LOCK_TMP_PREFIX "/.tX"
+#define LOCK_PREFIX "/.X"
+#define LOCK_SUFFIX "-lock"
+
+#if defined(DGUX)
+#include <limits.h>
+#include <sys/param.h>
+#endif
+
+#ifdef __UNIXOS2__
+#define link rename
+#endif
+
+#ifndef PATH_MAX
+#ifndef Lynx
+#include <sys/param.h>
+#else
+#include <param.h>
+#endif
+#ifndef PATH_MAX
+#ifdef MAXPATHLEN
+#define PATH_MAX MAXPATHLEN
+#else
+#define PATH_MAX 1024
+#endif
+#endif
+#endif
+
+static Bool StillLocking = FALSE;
+static char LockFile[PATH_MAX];
+static Bool nolock = FALSE;
+
+/*
+ * LockServer --
+ *      Check if the server lock file exists.  If so, check if the PID
+ *      contained inside is valid.  If so, then die.  Otherwise, create
+ *      the lock file containing the PID.
+ */
+void
+LockServer(void)
+{
+  char tmp[PATH_MAX], pid_str[12];
+  int lfd, i, haslock, l_pid, t;
+  char *tmppath = NULL;
+  int len;
+  char port[20];
+
+  if (nolock) return;
+  /*
+   * Path names
+   */
+#ifndef __UNIXOS2__
+  tmppath = LOCK_DIR;
+#else
+  /* OS/2 uses TMP directory, must also prepare for 8.3 names */
+  tmppath = getenv("TMP");
+  if (!tmppath)
+    FatalError("No TMP dir found\n");
+#endif
+
+  sprintf(port, "%d", atoi(display));
+  len = strlen(LOCK_PREFIX) > strlen(LOCK_TMP_PREFIX) ? strlen(LOCK_PREFIX) :
+						strlen(LOCK_TMP_PREFIX);
+  len += strlen(tmppath) + strlen(port) + strlen(LOCK_SUFFIX) + 1;
+  if (len > sizeof(LockFile))
+    FatalError("Display name `%s' is too long\n", port);
+  (void)sprintf(tmp, "%s" LOCK_TMP_PREFIX "%s" LOCK_SUFFIX, tmppath, port);
+  (void)sprintf(LockFile, "%s" LOCK_PREFIX "%s" LOCK_SUFFIX, tmppath, port);
+
+  /*
+   * Create a temporary file containing our PID.  Attempt three times
+   * to create the file.
+   */
+  StillLocking = TRUE;
+  i = 0;
+  do {
+    i++;
+    lfd = open(tmp, O_CREAT | O_EXCL | O_WRONLY, 0644);
+    if (lfd < 0)
+       sleep(2);
+    else
+       break;
+  } while (i < 3);
+  if (lfd < 0) {
+    unlink(tmp);
+    i = 0;
+    do {
+      i++;
+      lfd = open(tmp, O_CREAT | O_EXCL | O_WRONLY, 0644);
+      if (lfd < 0)
+         sleep(2);
+      else
+         break;
+    } while (i < 3);
+  }
+  if (lfd < 0)
+    FatalError("Could not create lock file in %s\n", tmp);
+  (void) sprintf(pid_str, "%10ld\n", (long)getpid());
+  (void) write(lfd, pid_str, 11);
+#ifndef __UNIXOS2__
+#ifndef USE_CHMOD
+  (void) fchmod(lfd, 0444);
+#else
+  (void) chmod(tmp, 0444);
+#endif
+#endif
+  (void) close(lfd);
+
+  /*
+   * OK.  Now the tmp file exists.  Try three times to move it in place
+   * for the lock.
+   */
+  i = 0;
+  haslock = 0;
+  while ((!haslock) && (i++ < 3)) {
+    haslock = (link(tmp,LockFile) == 0);
+    if (haslock) {
+      /*
+       * We're done.
+       */
+      break;
+    }
+    else {
+      /*
+       * Read the pid from the existing file
+       */
+      lfd = open(LockFile, O_RDONLY);
+      if (lfd < 0) {
+        unlink(tmp);
+        FatalError("Can't read lock file %s\n", LockFile);
+      }
+      pid_str[0] = '\0';
+      if (read(lfd, pid_str, 11) != 11) {
+        /*
+         * Bogus lock file.
+         */
+        unlink(LockFile);
+        close(lfd);
+        continue;
+      }
+      pid_str[11] = '\0';
+      sscanf(pid_str, "%d", &l_pid);
+      close(lfd);
+
+      /*
+       * Now try to kill the PID to see if it exists.
+       */
+      errno = 0;
+      t = kill(l_pid, 0);
+      if ((t< 0) && (errno == ESRCH)) {
+        /*
+         * Stale lock file.
+         */
+        unlink(LockFile);
+        continue;
+      }
+      else if (((t < 0) && (errno == EPERM)) || (t == 0)) {
+        /*
+         * Process is still active.
+         */
+        unlink(tmp);
+	FatalError("Server is already active for display %s\n%s %s\n%s\n",
+		   port, "\tIf this server is no longer running, remove",
+		   LockFile, "\tand start again.");
+      }
+    }
+  }
+  unlink(tmp);
+  if (!haslock)
+    FatalError("Could not create server lock file: %s\n", LockFile);
+  StillLocking = FALSE;
+}
+
+/*
+ * UnlockServer --
+ *      Remove the server lock file.
+ */
+void
+UnlockServer(void)
+{
+  if (nolock) return;
+
+  if (!StillLocking){
+
+#ifdef __UNIXOS2__
+  (void) chmod(LockFile,S_IREAD|S_IWRITE);
+#endif /* __UNIXOS2__ */
+  (void) unlink(LockFile);
+  }
+}
+#endif /* SERVER_LOCK */
+
+/* Force connections to close on SIGHUP from init */
+
+/*ARGSUSED*/
+SIGVAL
+AutoResetServer (int sig)
+{
+    int olderrno = errno;
+
+    dispatchException |= DE_RESET;
+    isItTimeToYield = TRUE;
+#ifdef GPROF
+    chdir ("/tmp");
+    exit (0);
+#endif
+#if defined(SYSV) && defined(X_NOT_POSIX)
+    OsSignal (SIGHUP, AutoResetServer);
+#endif
+    errno = olderrno;
+}
+
+/* Force connections to close and then exit on SIGTERM, SIGINT */
+
+/*ARGSUSED*/
+SIGVAL
+GiveUp(int sig)
+{
+    int olderrno = errno;
+
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+    fprintf(stderr, "GiveUp: Called with signal [%d].\n", sig);
+#endif
+
+    dispatchException |= DE_TERMINATE;
+    isItTimeToYield = TRUE;
+#if defined(SYSV) && defined(X_NOT_POSIX)
+    if (sig)
+	OsSignal(sig, SIG_IGN);
+#endif
+    errno = olderrno;
+}
+
+#ifndef DDXTIME
+CARD32
+GetTimeInMillis(void)
+{
+    struct timeval  tp;
+
+    X_GETTIMEOFDAY(&tp);
+    return(tp.tv_sec * 1000) + (tp.tv_usec / 1000);
+}
+#endif
+
+void
+AdjustWaitForDelay (pointer waitTime, unsigned long newdelay)
+{
+    static struct timeval   delay_val;
+    struct timeval	    **wt = (struct timeval **) waitTime;
+    unsigned long	    olddelay;
+
+    if (*wt == NULL)
+    {
+	delay_val.tv_sec = newdelay / 1000;
+	delay_val.tv_usec = 1000 * (newdelay % 1000);
+	*wt = &delay_val;
+    }
+    else
+    {
+	olddelay = (*wt)->tv_sec * 1000 + (*wt)->tv_usec / 1000;
+	if (newdelay < olddelay)
+	{
+	    (*wt)->tv_sec = newdelay / 1000;
+	    (*wt)->tv_usec = 1000 * (newdelay % 1000);
+	}
+    }
+}
+
+void UseMsg(void)
+{
+#if !defined(AIXrt) && !defined(AIX386)
+    ErrorF("use: X [:<display>] [option]\n");
+    ErrorF("-a #                   mouse acceleration (pixels)\n");
+    ErrorF("-ac                    disable access control restrictions\n");
+#ifdef MEMBUG
+    ErrorF("-alloc int             chance alloc should fail\n");
+#endif
+    ErrorF("-audit int             set audit trail level\n");	
+    ErrorF("-auth file             select authorization file\n");	
+    ErrorF("bc                     enable bug compatibility\n");
+    ErrorF("-br                    create root window with black background\n");
+    ErrorF("+bs                    enable any backing store support\n");
+    ErrorF("-bs                    disable any backing store support\n");
+    ErrorF("-c                     turns off key-click\n");
+    ErrorF("c #                    key-click volume (0-100)\n");
+    ErrorF("-cc int                default color visual class\n");
+    ErrorF("-co file               color database file\n");
+#ifdef COMMANDLINE_CHALLENGED_OPERATING_SYSTEMS
+    ErrorF("-config file           read options from file\n");
+#endif
+    ErrorF("-core                  generate core dump on fatal error\n");
+    ErrorF("-dpi int               screen resolution in dots per inch\n");
+#ifdef DPMSExtension
+    ErrorF("dpms                   enables VESA DPMS monitor control\n");
+    ErrorF("-dpms                  disables VESA DPMS monitor control\n");
+#endif
+    ErrorF("-deferglyphs [none|all|16] defer loading of [no|all|16-bit] glyphs\n");
+    ErrorF("-f #                   bell base (0-100)\n");
+    ErrorF("-fc string             cursor font\n");
+    ErrorF("-fn string             default font name\n");
+    ErrorF("-fp string             default font path\n");
+    ErrorF("-help                  prints message with these options\n");
+    ErrorF("-I                     ignore all remaining arguments\n");
+#ifdef RLIMIT_DATA
+    ErrorF("-ld int                limit data space to N Kb\n");
+#endif
+#ifdef RLIMIT_NOFILE
+    ErrorF("-lf int                limit number of open files to N\n");
+#endif
+#ifdef RLIMIT_STACK
+    ErrorF("-ls int                limit stack space to N Kb\n");
+#endif
+#ifdef SERVER_LOCK
+    ErrorF("-nolock                disable the locking mechanism\n");
+#endif
+#ifndef NOLOGOHACK
+    ErrorF("-logo                  enable logo in screen saver\n");
+    ErrorF("nologo                 disable logo in screen saver\n");
+#endif
+    ErrorF("-nolisten string       don't listen on protocol\n");
+    ErrorF("-noreset               don't reset after last client exists\n");
+    ErrorF("-reset                 reset after last client exists\n");
+    ErrorF("-p #                   screen-saver pattern duration (minutes)\n");
+    ErrorF("-pn                    accept failure to listen on all ports\n");
+    ErrorF("-nopn                  reject failure to listen on all ports\n");
+    ErrorF("-r                     turns off auto-repeat\n");
+    ErrorF("r                      turns on auto-repeat \n");
+#ifdef RENDER
+    ErrorF("-render [default|mono|gray|color] set render color alloc policy\n");
+#endif
+    ErrorF("-s #                   screen-saver timeout (minutes)\n");
+#ifdef XCSECURITY
+    ErrorF("-sp file               security policy file\n");
+#endif
+#ifdef XPRINT
+    PrinterUseMsg();
+#endif
+    ErrorF("-su                    disable any save under support\n");
+    ErrorF("-t #                   mouse threshold (pixels)\n");
+    ErrorF("-terminate             terminate at server reset\n");
+    ErrorF("-to #                  connection time out\n");
+    ErrorF("-tst                   disable testing extensions\n");
+    ErrorF("ttyxx                  server started from init on /dev/ttyxx\n");
+    ErrorF("v                      video blanking for screen-saver\n");
+    ErrorF("-v                     screen-saver without video blanking\n");
+    ErrorF("-wm                    WhenMapped default backing-store\n");
+    ErrorF("-x string              loads named extension at init time \n");
+    ErrorF("-maxbigreqsize         set maximal bigrequest size \n");
+#ifdef PANORAMIX
+    ErrorF("+xinerama              Enable XINERAMA extension\n");
+    ErrorF("-xinerama              Disable XINERAMA extension\n");
+#endif
+#ifdef SMART_SCHEDULE
+    ErrorF("-dumbSched             Disable smart scheduling, enable old behavior\n");
+    ErrorF("-schedInterval int     Set scheduler interval in msec\n");
+#endif
+    ErrorF("+extension name        Enable extension\n");
+    ErrorF("-extension name        Disable extension\n");
+#ifdef XDMCP
+    XdmcpUseMsg();
+#endif
+#endif /* !AIXrt && ! AIX386 */
+#ifdef XKB
+    XkbUseMsg();
+#endif
+    ddxUseMsg();
+}
+
+/*  This function performs a rudimentary sanity check
+ *  on the display name passed in on the command-line,
+ *  since this string is used to generate filenames.
+ *  It is especially important that the display name
+ *  not contain a "/" and not start with a "-".
+ *                                            --kvajk
+ */
+static int 
+VerifyDisplayName(const char *d)
+{
+    if ( d == (char *)0 ) return( 0 );  /*  null  */
+    if ( *d == '\0' ) return( 0 );  /*  empty  */
+    if ( *d == '-' ) return( 0 );  /*  could be confused for an option  */
+    if ( *d == '.' ) return( 0 );  /*  must not equal "." or ".."  */
+    if ( strchr(d, '/') != (char *)0 ) return( 0 );  /*  very important!!!  */
+    return( 1 );
+}
+
+/*
+ * This function is responsible for doing initalisation of any global
+ * variables at an very early point of server startup (even before
+ * |ProcessCommandLine()|. 
+ */
+void InitGlobals(void)
+{
+    ddxInitGlobals();
+}
+
+
+/*
+ * This function parses the command line. Handles device-independent fields
+ * and allows ddx to handle additional fields.  It is not allowed to modify
+ * argc or any of the strings pointed to by argv.
+ */
+void
+ProcessCommandLine(int argc, char *argv[])
+{
+    int i, skip;
+
+    defaultKeyboardControl.autoRepeat = TRUE;
+
+#ifdef NO_PART_NET
+    PartialNetwork = FALSE;
+#else
+    PartialNetwork = TRUE;
+#endif
+
+    for ( i = 1; i < argc; i++ )
+    {
+	/* call ddx first, so it can peek/override if it wants */
+        if((skip = ddxProcessArgument(argc, argv, i)))
+	{
+	    i += (skip - 1);
+	}
+	else if(argv[i][0] ==  ':')  
+	{
+	    /* initialize display */
+	    display = argv[i];
+	    display++;
+            if( ! VerifyDisplayName( display ) ) {
+                ErrorF("Bad display name: %s\n", display);
+                UseMsg();
+		FatalError("Bad display name, exiting: %s\n", display);
+            }
+	}
+	else if ( strcmp( argv[i], "-a") == 0)
+	{
+	    if(++i < argc)
+	        defaultPointerControl.num = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-ac") == 0)
+	{
+	    defeatAccessControl = TRUE;
+	}
+#ifdef MEMBUG
+	else if ( strcmp( argv[i], "-alloc") == 0)
+	{
+	    if(++i < argc)
+	        Memory_fail = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+#endif
+	else if ( strcmp( argv[i], "-audit") == 0)
+	{
+	    if(++i < argc)
+	        auditTrailLevel = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-auth") == 0)
+	{
+	    if(++i < argc)
+	        InitAuthorization (argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "bc") == 0)
+	    permitOldBugs = TRUE;
+	else if ( strcmp( argv[i], "-br") == 0)
+	    blackRoot = TRUE;
+	else if ( strcmp( argv[i], "+bs") == 0)
+	    enableBackingStore = TRUE;
+	else if ( strcmp( argv[i], "-bs") == 0)
+	    disableBackingStore = TRUE;
+	else if ( strcmp( argv[i], "c") == 0)
+	{
+	    if(++i < argc)
+	        defaultKeyboardControl.click = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-c") == 0)
+	{
+	    defaultKeyboardControl.click = 0;
+	}
+	else if ( strcmp( argv[i], "-cc") == 0)
+	{
+	    if(++i < argc)
+	        defaultColorVisualClass = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-co") == 0)
+	{
+	    if(++i < argc)
+	        rgbPath = argv[i];
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-core") == 0)
+	    CoreDump = TRUE;
+	else if ( strcmp( argv[i], "-dpi") == 0)
+	{
+	    if(++i < argc)
+	        monitorResolution = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+#ifdef DPMSExtension
+	else if ( strcmp( argv[i], "dpms") == 0)
+	    DPMSEnabledSwitch = TRUE;
+	else if ( strcmp( argv[i], "-dpms") == 0)
+	    DPMSDisabledSwitch = TRUE;
+#endif
+	else if ( strcmp( argv[i], "-deferglyphs") == 0)
+	{
+	    if(++i >= argc || !ParseGlyphCachingMode(argv[i]))
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-f") == 0)
+	{
+	    if(++i < argc)
+	        defaultKeyboardControl.bell = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-fc") == 0)
+	{
+	    if(++i < argc)
+	        defaultCursorFont = argv[i];
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-fn") == 0)
+	{
+	    if(++i < argc)
+	        defaultTextFont = argv[i];
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-fp") == 0)
+	{
+	    if(++i < argc)
+	    {
+#ifdef sgi
+		userdefinedfontpath = 1;
+#endif /* sgi */
+	        defaultFontPath = argv[i];
+	    }
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-help") == 0)
+	{
+	    UseMsg();
+	    exit(0);
+	}
+#ifdef XKB
+        else if ( (skip=XkbProcessArguments(argc,argv,i))!=0 ) {
+	    if (skip>0)
+		 i+= skip-1;
+	    else UseMsg();
+	}
+#endif
+#ifdef RLIMIT_DATA
+	else if ( strcmp( argv[i], "-ld") == 0)
+	{
+	    if(++i < argc)
+	    {
+	        limitDataSpace = atoi(argv[i]);
+		if (limitDataSpace > 0)
+		    limitDataSpace *= 1024;
+	    }
+	    else
+		UseMsg();
+	}
+#endif
+#ifdef RLIMIT_NOFILE
+	else if ( strcmp( argv[i], "-lf") == 0)
+	{
+	    if(++i < argc)
+	        limitNoFile = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+#endif
+#ifdef RLIMIT_STACK
+	else if ( strcmp( argv[i], "-ls") == 0)
+	{
+	    if(++i < argc)
+	    {
+	        limitStackSpace = atoi(argv[i]);
+		if (limitStackSpace > 0)
+		    limitStackSpace *= 1024;
+	    }
+	    else
+		UseMsg();
+	}
+#endif
+#ifdef SERVER_LOCK
+	else if ( strcmp ( argv[i], "-nolock") == 0)
+	{
+#if !defined(WIN32) && !defined(__UNIXOS2__) && !defined(__CYGWIN__)
+	  if (getuid() != 0)
+	    ErrorF("Warning: the -nolock option can only be used by root\n");
+	  else
+#endif
+	    nolock = TRUE;
+	}
+#endif
+#ifndef NOLOGOHACK
+	else if ( strcmp( argv[i], "-logo") == 0)
+	{
+	    logoScreenSaver = 1;
+	}
+	else if ( strcmp( argv[i], "nologo") == 0)
+	{
+	    logoScreenSaver = 0;
+	}
+#endif
+	else if ( strcmp( argv[i], "-nolisten") == 0)
+	{
+            if(++i < argc) {
+		if (_XSERVTransNoListen(argv[i])) 
+		    FatalError ("Failed to disable listen for %s transport",
+				argv[i]);
+	   } else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-noreset") == 0)
+	{
+	    dispatchExceptionAtReset = 0;
+	}
+	else if ( strcmp( argv[i], "-reset") == 0)
+	{
+	    dispatchExceptionAtReset = DE_RESET;
+	}
+	else if ( strcmp( argv[i], "-p") == 0)
+	{
+	    if(++i < argc)
+	        defaultScreenSaverInterval = ((CARD32)atoi(argv[i])) *
+					     MILLI_PER_MIN;
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-pn") == 0)
+	    PartialNetwork = TRUE;
+	else if ( strcmp( argv[i], "-nopn") == 0)
+	    PartialNetwork = FALSE;
+	else if ( strcmp( argv[i], "r") == 0)
+	    defaultKeyboardControl.autoRepeat = TRUE;
+	else if ( strcmp( argv[i], "-r") == 0)
+	    defaultKeyboardControl.autoRepeat = FALSE;
+	else if ( strcmp( argv[i], "-s") == 0)
+	{
+	    if(++i < argc)
+	        defaultScreenSaverTime = ((CARD32)atoi(argv[i])) *
+					 MILLI_PER_MIN;
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-su") == 0)
+	    disableSaveUnders = TRUE;
+	else if ( strcmp( argv[i], "-t") == 0)
+	{
+	    if(++i < argc)
+	        defaultPointerControl.threshold = atoi(argv[i]);
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-terminate") == 0)
+	{
+	    dispatchExceptionAtReset = DE_TERMINATE;
+	}
+	else if ( strcmp( argv[i], "-to") == 0)
+	{
+	    if(++i < argc)
+		TimeOutValue = ((CARD32)atoi(argv[i])) * MILLI_PER_SECOND;
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-tst") == 0)
+	{
+	    noTestExtensions = TRUE;
+	}
+	else if ( strcmp( argv[i], "v") == 0)
+	    defaultScreenSaverBlanking = PreferBlanking;
+	else if ( strcmp( argv[i], "-v") == 0)
+	    defaultScreenSaverBlanking = DontPreferBlanking;
+	else if ( strcmp( argv[i], "-wm") == 0)
+	    defaultBackingStore = WhenMapped;
+        else if ( strcmp( argv[i], "-maxbigreqsize") == 0) {
+             if(++i < argc) {
+                 long reqSizeArg = atol(argv[i]);
+
+                 /* Request size > 128MB does not make much sense... */
+                 if( reqSizeArg > 0L && reqSizeArg < 128L ) {
+                     maxBigRequestSize = (reqSizeArg * 1048576L) - 1L;
+                 }
+                 else
+                 {
+                     UseMsg();
+                 }
+             }
+             else
+             {
+                 UseMsg();
+             }
+         }
+#ifdef PANORAMIX
+	else if ( strcmp( argv[i], "+xinerama") == 0){
+	    noPanoramiXExtension = FALSE;
+	}
+	else if ( strcmp( argv[i], "-xinerama") == 0){
+	    noPanoramiXExtension = TRUE;
+	}
+	else if ( strcmp( argv[i], "-disablexineramaextension") == 0){
+	    PanoramiXExtensionDisabledHack = TRUE;
+	}
+#endif
+	else if ( strcmp( argv[i], "-x") == 0)
+	{
+	    if(++i >= argc)
+		UseMsg();
+	    /* For U**x, which doesn't support dynamic loading, there's nothing
+	     * to do when we see a -x.  Either the extension is linked in or
+	     * it isn't */
+	}
+	else if ( strcmp( argv[i], "-I") == 0)
+	{
+	    /* ignore all remaining arguments */
+	    break;
+	}
+	else if (strncmp (argv[i], "tty", 3) == 0)
+	{
+	    /* just in case any body is interested */
+	    dev_tty_from_init = argv[i];
+	}
+#ifdef XDMCP
+	else if ((skip = XdmcpOptions(argc, argv, i)) != i)
+	{
+	    i = skip - 1;
+	}
+#endif
+#ifdef XPRINT
+	else if ((skip = PrinterOptions(argc, argv, i)) != i)
+	{
+	    i = skip - 1;
+	}
+#endif
+#ifdef XCSECURITY
+	else if ((skip = XSecurityOptions(argc, argv, i)) != i)
+	{
+	    i = skip - 1;
+	}
+#endif
+#ifdef AIXV3
+        else if ( strcmp( argv[i], "-timeout") == 0)
+        {
+            if(++i < argc)
+                SelectWaitTime = atoi(argv[i]);
+            else
+                UseMsg();
+        }
+        else if ( strcmp( argv[i], "-sync") == 0)
+        {
+            SyncOn++;
+        }
+#endif
+#ifdef SMART_SCHEDULE
+	else if ( strcmp( argv[i], "-dumbSched") == 0)
+	{
+	    SmartScheduleDisable = TRUE;
+	}
+	else if ( strcmp( argv[i], "-schedInterval") == 0)
+	{
+	    if (++i < argc)
+	    {
+		SmartScheduleInterval = atoi(argv[i]);
+		SmartScheduleSlice = SmartScheduleInterval;
+	    }
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-schedMax") == 0)
+	{
+	    if (++i < argc)
+	    {
+		SmartScheduleMaxSlice = atoi(argv[i]);
+	    }
+	    else
+		UseMsg();
+	}
+#endif
+#ifdef RENDER
+	else if ( strcmp( argv[i], "-render" ) == 0)
+	{
+	    if (++i < argc)
+	    {
+		int policy = PictureParseCmapPolicy (argv[i]);
+
+		if (policy != PictureCmapPolicyInvalid)
+		    PictureCmapPolicy = policy;
+		else
+		    UseMsg ();
+	    }
+	    else
+		UseMsg ();
+	}
+#endif
+	else if ( strcmp( argv[i], "+extension") == 0)
+	{
+	    if (++i < argc)
+	    {
+		if (!EnableDisableExtension(argv[i], TRUE))
+		    EnableDisableExtensionError(argv[i], TRUE);
+	    }
+	    else
+		UseMsg();
+	}
+	else if ( strcmp( argv[i], "-extension") == 0)
+	{
+	    if (++i < argc)
+	    {
+		if (!EnableDisableExtension(argv[i], FALSE))
+		    EnableDisableExtensionError(argv[i], FALSE);
+	    }
+	    else
+		UseMsg();
+	}
+ 	else
+ 	{
+	    ErrorF("Unrecognized option: %s\n", argv[i]);
+	    UseMsg();
+	    FatalError("Unrecognized option: %s\n", argv[i]);
+        }
+    }
+}
+
+#ifdef COMMANDLINE_CHALLENGED_OPERATING_SYSTEMS
+static void
+InsertFileIntoCommandLine(
+    int *resargc, char ***resargv, 
+    int prefix_argc, char **prefix_argv,
+    char *filename, 
+    int suffix_argc, char **suffix_argv)
+{
+    struct stat     st;
+    FILE           *f;
+    char           *p;
+    char           *q;
+    int             insert_argc;
+    char           *buf;
+    int             len;
+    int             i;
+
+    f = fopen(filename, "r");
+    if (!f)
+	FatalError("Can't open option file %s\n", filename);
+
+    fstat(fileno(f), &st);
+
+    buf = (char *) xalloc((unsigned) st.st_size + 1);
+    if (!buf)
+	FatalError("Out of Memory\n");
+
+    len = fread(buf, 1, (unsigned) st.st_size, f);
+
+    fclose(f);
+
+    if (len < 0)
+	FatalError("Error reading option file %s\n", filename);
+
+    buf[len] = '\0';
+
+    p = buf;
+    q = buf;
+    insert_argc = 0;
+
+    while (*p)
+    {
+	while (isspace(*p))
+	    p++;
+	if (!*p)
+	    break;
+	if (*p == '#')
+	{
+	    while (*p && *p != '\n')
+		p++;
+	} else
+	{
+	    while (*p && !isspace(*p))
+		*q++ = *p++;
+	    /* Since p and q might still be pointing at the same place, we	 */
+	    /* need to step p over the whitespace now before we add the null.	 */
+	    if (*p)
+		p++;
+	    *q++ = '\0';
+	    insert_argc++;
+	}
+    }
+
+    buf = (char *) xrealloc(buf, q - buf);
+    if (!buf)
+	FatalError("Out of memory reallocing option buf\n");
+
+    *resargc = prefix_argc + insert_argc + suffix_argc;
+    *resargv = (char **) xalloc((*resargc + 1) * sizeof(char *));
+    if (!*resargv)
+	FatalError("Out of Memory\n");
+
+    memcpy(*resargv, prefix_argv, prefix_argc * sizeof(char *));
+
+    p = buf;
+    for (i = 0; i < insert_argc; i++)
+    {
+	(*resargv)[prefix_argc + i] = p;
+	p += strlen(p) + 1;
+    }
+
+    memcpy(*resargv + prefix_argc + insert_argc,
+	   suffix_argv, suffix_argc * sizeof(char *));
+
+    (*resargv)[*resargc] = NULL;
+} /* end InsertFileIntoCommandLine */
+
+
+void
+ExpandCommandLine(int *pargc, char ***pargv)
+{
+    int i;
+
+#if !defined(WIN32) && !defined(__UNIXOS2__) && !defined(__CYGWIN__)
+    if (getuid() != geteuid())
+	return;
+#endif
+
+    for (i = 1; i < *pargc; i++)
+    {
+	if ( (0 == strcmp((*pargv)[i], "-config")) && (i < (*pargc - 1)) )
+	{
+	    InsertFileIntoCommandLine(pargc, pargv,
+					  i, *pargv,
+					  (*pargv)[i+1], /* filename */
+					  *pargc - i - 2, *pargv + i + 2);
+	    i--;
+	}
+    }
+} /* end ExpandCommandLine */
+#endif
+
+/* Implement a simple-minded font authorization scheme.  The authorization
+   name is "hp-hostname-1", the contents are simply the host name. */
+int
+set_font_authorizations(char **authorizations, int *authlen, pointer client)
+{
+#define AUTHORIZATION_NAME "hp-hostname-1"
+#if defined(TCPCONN) || defined(STREAMSCONN)
+    static char *result = NULL;
+    static char *p = NULL;
+
+    if (p == NULL)
+    {
+	char hname[1024], *hnameptr;
+	unsigned int len;
+#if defined(IPv6) && defined(AF_INET6)
+	struct addrinfo hints, *ai = NULL;
+#else
+	struct hostent *host;
+#ifdef XTHREADS_NEEDS_BYNAMEPARAMS
+	_Xgethostbynameparams hparams;
+#endif
+#endif
+
+	gethostname(hname, 1024);
+#if defined(IPv6) && defined(AF_INET6)
+	bzero(&hints, sizeof(hints));
+	hints.ai_flags = AI_CANONNAME;
+	if (getaddrinfo(hname, NULL, &hints, &ai) == 0) {
+	    hnameptr = ai->ai_canonname;
+	} else {
+	    hnameptr = hname;
+	}
+#else
+	host = _XGethostbyname(hname, hparams);
+	if (host == NULL)
+	    hnameptr = hname;
+	else
+	    hnameptr = host->h_name;
+#endif
+
+	len = strlen(hnameptr) + 1;
+	result = xalloc(len + sizeof(AUTHORIZATION_NAME) + 4);
+
+	p = result;
+        *p++ = sizeof(AUTHORIZATION_NAME) >> 8;
+        *p++ = sizeof(AUTHORIZATION_NAME) & 0xff;
+        *p++ = (len) >> 8;
+        *p++ = (len & 0xff);
+
+	memmove(p, AUTHORIZATION_NAME, sizeof(AUTHORIZATION_NAME));
+	p += sizeof(AUTHORIZATION_NAME);
+	memmove(p, hnameptr, len);
+	p += len;
+#if defined(IPv6) && defined(AF_INET6)
+	if (ai) {
+	    freeaddrinfo(ai);
+	}
+#endif
+    }
+    *authlen = p - result;
+    *authorizations = result;
+    return 1;
+#else /* TCPCONN */
+    return 0;
+#endif /* TCPCONN */
+}
+
+/* XALLOC -- X's internal memory allocator.  Why does it return unsigned
+ * long * instead of the more common char *?  Well, if you read K&R you'll
+ * see they say that alloc must return a pointer "suitable for conversion"
+ * to whatever type you really want.  In a full-blown generic allocator
+ * there's no way to solve the alignment problems without potentially
+ * wasting lots of space.  But we have a more limited problem. We know
+ * we're only ever returning pointers to structures which will have to
+ * be long word aligned.  So we are making a stronger guarantee.  It might
+ * have made sense to make Xalloc return char * to conform with people's
+ * expectations of malloc, but this makes lint happier.
+ */
+
+#ifndef INTERNAL_MALLOC
+
+void * 
+Xalloc(unsigned long amount)
+{
+    register pointer  ptr;
+	
+    if ((long)amount <= 0) {
+	return (unsigned long *)NULL;
+    }
+    /* aligned extra on long word boundary */
+    amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
+#ifdef MEMBUG
+    if (!Must_have_memory && Memory_fail &&
+	((random() % MEM_FAIL_SCALE) < Memory_fail))
+	return (unsigned long *)NULL;
+#endif
+    if ((ptr = (pointer)malloc(amount))) {
+	return (unsigned long *)ptr;
+    }
+    if (Must_have_memory)
+	FatalError("Out of memory");
+    return (unsigned long *)NULL;
+}
+
+/*****************
+ * XNFalloc 
+ * "no failure" realloc, alternate interface to Xalloc w/o Must_have_memory
+ *****************/
+
+void *
+XNFalloc(unsigned long amount)
+{
+    register pointer ptr;
+
+    if ((long)amount <= 0)
+    {
+        return (unsigned long *)NULL;
+    }
+    /* aligned extra on long word boundary */
+    amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
+    ptr = (pointer)malloc(amount);
+    if (!ptr)
+    {
+        FatalError("Out of memory");
+    }
+    return ((unsigned long *)ptr);
+}
+
+/*****************
+ * Xcalloc
+ *****************/
+
+void *
+Xcalloc(unsigned long amount)
+{
+    unsigned long   *ret;
+
+    ret = Xalloc (amount);
+    if (ret)
+	bzero ((char *) ret, (int) amount);
+    return ret;
+}
+
+/*****************
+ * XNFcalloc
+ *****************/
+
+void *
+XNFcalloc(unsigned long amount)
+{
+    unsigned long   *ret;
+
+    ret = Xalloc (amount);
+    if (ret)
+	bzero ((char *) ret, (int) amount);
+    else if ((long)amount > 0)
+        FatalError("Out of memory");
+    return ret;
+}
+
+/*****************
+ * Xrealloc
+ *****************/
+
+void *
+Xrealloc(pointer ptr, unsigned long amount)
+{
+#ifdef MEMBUG
+    if (!Must_have_memory && Memory_fail &&
+	((random() % MEM_FAIL_SCALE) < Memory_fail))
+	return (unsigned long *)NULL;
+#endif
+    if ((long)amount <= 0)
+    {
+	if (ptr && !amount)
+	    free(ptr);
+	return (unsigned long *)NULL;
+    }
+    amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
+    if (ptr)
+        ptr = (pointer)realloc((char *)ptr, amount);
+    else
+	ptr = (pointer)malloc(amount);
+    if (ptr)
+        return (unsigned long *)ptr;
+    if (Must_have_memory)
+	FatalError("Out of memory");
+    return (unsigned long *)NULL;
+}
+                    
+/*****************
+ * XNFrealloc 
+ * "no failure" realloc, alternate interface to Xrealloc w/o Must_have_memory
+ *****************/
+
+void *
+XNFrealloc(pointer ptr, unsigned long amount)
+{
+    if (( ptr = (pointer)Xrealloc( ptr, amount ) ) == NULL)
+    {
+	if ((long)amount > 0)
+            FatalError( "Out of memory" );
+    }
+    return ((unsigned long *)ptr);
+}
+
+/*****************
+ *  Xfree
+ *    calls free 
+ *****************/    
+
+void
+Xfree(pointer ptr)
+{
+    if (ptr)
+	free((char *)ptr); 
+}
+
+void
+OsInitAllocator (void)
+{
+#ifdef MEMBUG
+    static int	been_here;
+
+    /* Check the memory system after each generation */
+    if (been_here)
+	CheckMemory ();
+    else
+	been_here = 1;
+#endif
+}
+#endif /* !INTERNAL_MALLOC */
+
+
+char *
+Xstrdup(const char *s)
+{
+    char *sd;
+
+    if (s == NULL)
+	return NULL;
+
+    sd = (char *)Xalloc(strlen(s) + 1);
+    if (sd != NULL)
+	strcpy(sd, s);
+    return sd;
+}
+
+
+char *
+XNFstrdup(const char *s)
+{
+    char *sd;
+
+    if (s == NULL)
+	return NULL;
+
+    sd = (char *)XNFalloc(strlen(s) + 1);
+    strcpy(sd, s);
+    return sd;
+}
+
+#ifdef SMART_SCHEDULE
+
+unsigned long	SmartScheduleIdleCount;
+Bool		SmartScheduleIdle;
+Bool		SmartScheduleTimerStopped;
+
+#ifdef SIGVTALRM
+#define SMART_SCHEDULE_POSSIBLE
+#endif
+
+#ifdef SMART_SCHEDULE_POSSIBLE
+#define SMART_SCHEDULE_SIGNAL		SIGALRM
+#define SMART_SCHEDULE_TIMER		ITIMER_REAL
+#endif
+
+#ifdef NX_TRANS_SOCKET
+void
+SmartScheduleStopTimer (void)
+#else
+static void
+SmartScheduleStopTimer (void)
+#endif
+{
+#ifdef SMART_SCHEDULE_POSSIBLE
+    struct itimerval	timer;
+
+    #ifdef NX_TRANS_TEST
+    fprintf(stderr, "SmartScheduleStopTimer: Stopping timer.\n");
+    #endif
+
+    timer.it_interval.tv_sec = 0;
+    timer.it_interval.tv_usec = 0;
+    timer.it_value.tv_sec = 0;
+    timer.it_value.tv_usec = 0;
+    (void) setitimer (ITIMER_REAL, &timer, 0);
+    SmartScheduleTimerStopped = TRUE;
+#endif
+}
+
+Bool
+SmartScheduleStartTimer (void)
+{
+#ifdef SMART_SCHEDULE_POSSIBLE
+    struct itimerval	timer;
+
+    #ifdef NX_TRANS_SOCKET
+
+    if (SmartScheduleDisable)
+    {
+      return FALSE;
+    }
+
+    #endif
+
+    #ifdef NX_TRANS_TEST
+    fprintf(stderr, "SmartScheduleStartTimer: Starting timer with [%ld] ms.\n",
+                SmartScheduleInterval);
+    #endif
+
+    SmartScheduleTimerStopped = FALSE;
+    timer.it_interval.tv_sec = 0;
+    timer.it_interval.tv_usec = SmartScheduleInterval * 1000;
+    timer.it_value.tv_sec = 0;
+    timer.it_value.tv_usec = SmartScheduleInterval * 1000;
+    return setitimer (ITIMER_REAL, &timer, 0) >= 0;
+#endif
+    return FALSE;
+}
+
+#ifdef SMART_SCHEDULE_POSSIBLE
+static void
+SmartScheduleTimer (int sig)
+{
+    int olderrno = errno;
+
+    SmartScheduleTime += SmartScheduleInterval;
+
+    #ifdef NX_TRANS_TEST
+    fprintf(stderr, "SmartScheduleTimer: Got timer with time [%ld] ms.\n",
+                SmartScheduleTime);
+    #endif
+
+    if (SmartScheduleIdle)
+    {
+	SmartScheduleStopTimer ();
+    }
+    errno = olderrno;
+}
+#endif
+
+Bool
+SmartScheduleInit (void)
+{
+#ifdef SMART_SCHEDULE_POSSIBLE
+    struct sigaction	act;
+
+    if (SmartScheduleDisable)
+	return TRUE;
+    
+    #ifdef NX_TRANS_TEST
+    fprintf(stderr, "SmartScheduleInit: Initializing the smart scheduler.\n");
+    #endif
+
+    bzero ((char *) &act, sizeof(struct sigaction));
+
+    /* Set up the timer signal function */
+    act.sa_handler = SmartScheduleTimer;
+    sigemptyset (&act.sa_mask);
+    sigaddset (&act.sa_mask, SMART_SCHEDULE_SIGNAL);
+    if (sigaction (SMART_SCHEDULE_SIGNAL, &act, 0) < 0)
+    {
+	perror ("sigaction for smart scheduler");
+	return FALSE;
+    }
+    /* Set up the virtual timer */
+    if (!SmartScheduleStartTimer ())
+    {
+	perror ("scheduling timer");
+	return FALSE;
+    }
+    /* stop the timer and wait for WaitForSomething to start it */
+    SmartScheduleStopTimer ();
+    return TRUE;
+#else
+    return FALSE;
+#endif
+}
+#endif
+
+#ifdef SIG_BLOCK
+static sigset_t	PreviousSignalMask;
+static int	BlockedSignalCount;
+#endif
+
+void
+OsBlockSignals (void)
+{
+#ifdef SIG_BLOCK
+    if (BlockedSignalCount++ == 0)
+    {
+	sigset_t    set;
+	
+	sigemptyset (&set);
+#ifdef SIGALRM
+	sigaddset (&set, SIGALRM);
+#endif
+#ifdef SIGVTALRM
+	sigaddset (&set, SIGVTALRM);
+#endif
+#ifdef SIGWINCH
+	sigaddset (&set, SIGWINCH);
+#endif
+#ifdef SIGIO
+	sigaddset (&set, SIGIO);
+#endif
+#ifdef SIGTSTP
+	sigaddset (&set, SIGTSTP);
+#endif
+#ifdef SIGTTIN
+	sigaddset (&set, SIGTTIN);
+#endif
+#ifdef SIGTTOU
+	sigaddset (&set, SIGTTOU);
+#endif
+#ifdef SIGCHLD
+	sigaddset (&set, SIGCHLD);
+#endif
+	sigprocmask (SIG_BLOCK, &set, &PreviousSignalMask);
+    }
+#endif
+}
+
+void
+OsReleaseSignals (void)
+{
+#ifdef SIG_BLOCK
+    if (--BlockedSignalCount == 0)
+    {
+	sigprocmask (SIG_SETMASK, &PreviousSignalMask, 0);
+    }
+#endif
+}
+
+#if !defined(WIN32) && !defined(__UNIXOS2__)
+/*
+ * "safer" versions of system(3), popen(3) and pclose(3) which give up
+ * all privs before running a command.
+ *
+ * This is based on the code in FreeBSD 2.2 libc.
+ *
+ * XXX It'd be good to redirect stderr so that it ends up in the log file
+ * as well.  As it is now, xkbcomp messages don't end up in the log file.
+ */
+
+int
+System(char *command)
+{
+    int pid, p;
+#ifdef SIGCHLD
+    void (*csig)(int);
+#endif
+    int status;
+
+    if (!command)
+	return(1);
+
+#ifdef SIGCHLD
+    csig = signal(SIGCHLD, SIG_DFL);
+#endif
+
+#ifdef DEBUG
+    ErrorF("System: `%s'\n", command);
+#endif
+
+#ifdef NX_TRANS_EXIT
+    if (OsVendorStartRedirectErrorFProc != NULL) {
+        OsVendorStartRedirectErrorFProc();
+    }
+#endif
+    switch (pid = fork()) {
+    case -1:	/* error */
+	p = -1;
+    case 0:	/* child */
+	if (setgid(getgid()) == -1)
+	    _exit(127);
+	if (setuid(getuid()) == -1)
+	    _exit(127);
+	execl("/bin/sh", "sh", "-c", command, (char *)NULL);
+	_exit(127);
+    default:	/* parent */
+	do {
+	    p = waitpid(pid, &status, 0);
+	} while (p == -1 && errno == EINTR);
+	
+    }
+#ifdef NX_TRANS_EXIT
+    if (OsVendorEndRedirectErrorFProc != NULL) {
+        OsVendorEndRedirectErrorFProc();
+    }
+#endif
+
+#ifdef SIGCHLD
+    signal(SIGCHLD, csig);
+#endif
+
+    return p == -1 ? -1 : status;
+}
+
+static struct pid {
+    struct pid *next;
+    FILE *fp;
+    int pid;
+} *pidlist;
+
+pointer
+Popen(char *command, char *type)
+{
+    struct pid *cur;
+    FILE *iop;
+    int pdes[2], pid;
+
+    if (command == NULL || type == NULL)
+	return NULL;
+
+    if ((*type != 'r' && *type != 'w') || type[1])
+	return NULL;
+
+    if ((cur = (struct pid *)xalloc(sizeof(struct pid))) == NULL)
+	return NULL;
+
+    if (pipe(pdes) < 0) {
+	xfree(cur);
+	return NULL;
+    }
+
+#ifdef NX_TRANS_EXIT
+    if (OsVendorStartRedirectErrorFProc != NULL) {
+        OsVendorStartRedirectErrorFProc();
+    }
+#endif
+    switch (pid = fork()) {
+    case -1: 	/* error */
+	close(pdes[0]);
+	close(pdes[1]);
+	xfree(cur);
+	return NULL;
+    case 0:	/* child */
+	if (setgid(getgid()) == -1)
+	    _exit(127);
+	if (setuid(getuid()) == -1)
+	    _exit(127);
+	if (*type == 'r') {
+	    if (pdes[1] != 1) {
+		/* stdout */
+		dup2(pdes[1], 1);
+		close(pdes[1]);
+	    }
+	    close(pdes[0]);
+	} else {
+	    if (pdes[0] != 0) {
+		/* stdin */
+		dup2(pdes[0], 0);
+		close(pdes[0]);
+	    }
+	    close(pdes[1]);
+	}
+
+        #ifdef NX_TRANS_SOCKET
+
+        /*
+         * Check if the child process should not
+         * use the parent's libraries.
+         */
+
+        if (_NXUnsetLibraryPath)
+        {
+          #ifndef __sun
+
+          unsetenv ("LD_LIBRARY_PATH");
+
+          #else
+
+          extern char **environ;
+
+          char **ep = environ;
+
+          ep = environ;
+
+          while (*ep)
+          {
+            if (!strncmp("LD_LIBRARY_PATH=", *ep, strlen("LD_LIBRARY_PATH=")))
+            {
+              break;
+            }
+
+            *ep++;
+          }
+
+          while (*ep)
+          {
+            *ep = *(ep + 1);
+            ep++;
+          }
+
+          #endif
+        }
+
+        #endif
+
+	execl("/bin/sh", "sh", "-c", command, (char *)NULL);
+	_exit(127);
+    }
+
+    /* Avoid EINTR during stdio calls */
+    OsBlockSignals ();
+    
+    /* parent */
+    if (*type == 'r') {
+	iop = fdopen(pdes[0], type);
+	close(pdes[1]);
+    } else {
+	iop = fdopen(pdes[1], type);
+	close(pdes[0]);
+    }
+
+    cur->fp = iop;
+    cur->pid = pid;
+    cur->next = pidlist;
+    pidlist = cur;
+
+#ifdef DEBUG
+    ErrorF("Popen: `%s', fp = %p\n", command, iop);
+#endif
+
+    return iop;
+}
+
+/* fopen that drops privileges */
+pointer
+Fopen(char *file, char *type)
+{
+    FILE *iop;
+#ifndef HAS_SAVED_IDS_AND_SETEUID
+    struct pid *cur;
+    int pdes[2], pid;
+
+    if (file == NULL || type == NULL)
+	return NULL;
+
+    if ((*type != 'r' && *type != 'w') || type[1])
+	return NULL;
+
+    if ((cur = (struct pid *)xalloc(sizeof(struct pid))) == NULL)
+	return NULL;
+
+    if (pipe(pdes) < 0) {
+	xfree(cur);
+	return NULL;
+    }
+
+    switch (pid = fork()) {
+    case -1: 	/* error */
+	close(pdes[0]);
+	close(pdes[1]);
+	xfree(cur);
+	return NULL;
+    case 0:	/* child */
+	if (setgid(getgid()) == -1)
+	    _exit(127);
+	if (setuid(getuid()) == -1)
+	    _exit(127);
+	if (*type == 'r') {
+	    if (pdes[1] != 1) {
+		/* stdout */
+		dup2(pdes[1], 1);
+		close(pdes[1]);
+	    }
+	    close(pdes[0]);
+	} else {
+	    if (pdes[0] != 0) {
+		/* stdin */
+		dup2(pdes[0], 0);
+		close(pdes[0]);
+	    }
+	    close(pdes[1]);
+	}
+	execl("/bin/cat", "cat", file, (char *)NULL);
+	_exit(127);
+    }
+
+    /* Avoid EINTR during stdio calls */
+    OsBlockSignals ();
+    
+    /* parent */
+    if (*type == 'r') {
+	iop = fdopen(pdes[0], type);
+	close(pdes[1]);
+    } else {
+	iop = fdopen(pdes[1], type);
+	close(pdes[0]);
+    }
+
+    cur->fp = iop;
+    cur->pid = pid;
+    cur->next = pidlist;
+    pidlist = cur;
+
+#ifdef DEBUG
+    ErrorF("Popen: `%s', fp = %p\n", command, iop);
+#endif
+
+    return iop;
+#else
+    int ruid, euid;
+
+    ruid = getuid();
+    euid = geteuid();
+    
+    if (seteuid(ruid) == -1) {
+	    return NULL;
+    }
+    iop = fopen(file, type);
+
+    if (seteuid(euid) == -1) {
+	    fclose(iop);
+	    return NULL;
+    }
+    return iop;
+#endif /* HAS_SAVED_IDS_AND_SETEUID */
+}
+
+int
+Pclose(pointer iop)
+{
+    struct pid *cur, *last;
+    int pstat;
+    int pid;
+
+#ifdef DEBUG
+    ErrorF("Pclose: fp = %p\n", iop);
+#endif
+
+    fclose(iop);
+
+    for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
+	if (cur->fp == iop)
+	    break;
+    if (cur == NULL)
+	return -1;
+
+    do {
+	pid = waitpid(cur->pid, &pstat, 0);
+    } while (pid == -1 && errno == EINTR);
+
+    if (last == NULL)
+	pidlist = cur->next;
+    else
+	last->next = cur->next;
+    xfree(cur);
+
+    /* allow EINTR again */
+    OsReleaseSignals ();
+    
+#ifdef NX_TRANS_EXIT
+    if (OsVendorEndRedirectErrorFProc != NULL) {
+        OsVendorEndRedirectErrorFProc();
+    }
+#endif
+    return pid == -1 ? -1 : pstat;
+}
+
+int 
+Fclose(pointer iop)
+{
+#ifdef HAS_SAVED_IDS_AND_SETEUID
+    return fclose(iop);
+#else
+    return Pclose(iop);
+#endif
+}
+
+#endif /* !WIN32 && !__UNIXOS2__ */
+
+
+/*
+ * CheckUserParameters: check for long command line arguments and long
+ * environment variables.  By default, these checks are only done when
+ * the server's euid != ruid.  In 3.3.x, these checks were done in an
+ * external wrapper utility.
+ */
+
+/* Consider LD* variables insecure? */
+#ifndef REMOVE_ENV_LD
+#define REMOVE_ENV_LD 1
+#endif
+
+/* Remove long environment variables? */
+#ifndef REMOVE_LONG_ENV
+#define REMOVE_LONG_ENV 1
+#endif
+
+/*
+ * Disallow stdout or stderr as pipes?  It's possible to block the X server
+ * when piping stdout+stderr to a pipe.
+ *
+ * Don't enable this because it looks like it's going to cause problems.
+ */
+#ifndef NO_OUTPUT_PIPES
+#define NO_OUTPUT_PIPES 0
+#endif
+
+
+/* Check args and env only if running setuid (euid == 0 && euid != uid) ? */
+#ifndef CHECK_EUID
+#ifndef WIN32
+#define CHECK_EUID 1
+#else
+#define CHECK_EUID 0
+#endif
+#endif
+
+/*
+ * Maybe the locale can be faked to make isprint(3) report that everything
+ * is printable?  Avoid it by default.
+ */
+#ifndef USE_ISPRINT
+#define USE_ISPRINT 0
+#endif
+
+#define MAX_ARG_LENGTH          128
+#define MAX_ENV_LENGTH          256
+#define MAX_ENV_PATH_LENGTH     2048	/* Limit for *PATH and TERMCAP */
+
+#if USE_ISPRINT
+#include <ctype.h>
+#define checkPrintable(c) isprint(c)
+#else
+#define checkPrintable(c) (((c) & 0x7f) >= 0x20 && ((c) & 0x7f) != 0x7f)
+#endif
+
+enum BadCode {
+    NotBad = 0,
+    UnsafeArg,
+    ArgTooLong,
+    UnprintableArg,
+    EnvTooLong,
+    OutputIsPipe,
+    InternalError
+};
+
+#if defined(VENDORSUPPORT)
+#define BUGADDRESS VENDORSUPPORT
+#elif defined(BUILDERADDR)
+#define BUGADDRESS BUILDERADDR
+#else
+#define BUGADDRESS "xorg@freedesktop.org"
+#endif
+
+#define ARGMSG \
+    "\nIf the arguments used are valid, and have been rejected incorrectly\n" \
+      "please send details of the arguments and why they are valid to\n" \
+      "%s.  In the meantime, you can start the Xserver as\n" \
+      "the \"super user\" (root).\n"   
+
+#define ENVMSG \
+    "\nIf the environment is valid, and have been rejected incorrectly\n" \
+      "please send details of the environment and why it is valid to\n" \
+      "%s.  In the meantime, you can start the Xserver as\n" \
+      "the \"super user\" (root).\n"
+
+void
+CheckUserParameters(int argc, char **argv, char **envp)
+{
+    enum BadCode bad = NotBad;
+    int i = 0, j;
+    char *a, *e = NULL;
+#if defined(__QNX__) && !defined(__QNXNTO__)
+    char cmd_name[64];
+#endif
+
+#if CHECK_EUID
+    if (geteuid() == 0 && getuid() != geteuid())
+#endif
+    {
+	/* Check each argv[] */
+	for (i = 1; i < argc; i++) {
+	    if (strcmp(argv[i], "-fp") == 0)
+	    {
+		i++; /* continue with next argument. skip the length check */
+		if (i >= argc)
+		    break;
+	    } else
+	    {
+		if (strlen(argv[i]) > MAX_ARG_LENGTH) {
+		    bad = ArgTooLong;
+		    break;
+		}
+	    }
+	    a = argv[i];
+	    while (*a) {
+		if (checkPrintable(*a) == 0) {
+		    bad = UnprintableArg;
+		    break;
+		}
+		a++;
+	    }
+	    if (bad)
+		break;
+	}
+	if (!bad) {
+	    /* Check each envp[] */
+	    for (i = 0; envp[i]; i++) {
+
+		/* Check for bad environment variables and values */
+#if REMOVE_ENV_LD
+		while (envp[i] && (strncmp(envp[i], "LD", 2) == 0)) {
+#ifdef ENVDEBUG
+		    ErrorF("CheckUserParameters: removing %s from the "
+			   "environment\n", strtok(envp[i], "="));
+#endif
+		    for (j = i; envp[j]; j++) {
+			envp[j] = envp[j+1];
+		    }
+		}
+#endif   
+		if (envp[i] && (strlen(envp[i]) > MAX_ENV_LENGTH)) {
+#if REMOVE_LONG_ENV
+#ifdef ENVDEBUG
+		    ErrorF("CheckUserParameters: removing %s from the "
+			   "environment\n", strtok(envp[i], "="));
+#endif
+		    for (j = i; envp[j]; j++) {
+			envp[j] = envp[j+1];
+		    }
+		    i--;
+#else
+		    char *eq;
+		    int len;
+
+		    eq = strchr(envp[i], '=');
+		    if (!eq)
+			continue;
+		    len = eq - envp[i];
+		    e = malloc(len + 1);
+		    if (!e) {
+			bad = InternalError;
+			break;
+		    }
+		    strncpy(e, envp[i], len);
+		    e[len] = 0;
+		    if (len >= 4 &&
+			(strcmp(e + len - 4, "PATH") == 0 ||
+			 strcmp(e, "TERMCAP") == 0)) {
+			if (strlen(envp[i]) > MAX_ENV_PATH_LENGTH) {
+			    bad = EnvTooLong;
+			    break;
+			} else {
+			    free(e);
+			}
+		    } else {
+			bad = EnvTooLong;
+			break;
+		    }
+#endif
+		}
+	    }
+	}
+#if NO_OUTPUT_PIPES
+	if (!bad) {
+	    struct stat buf;
+
+	    if (fstat(fileno(stdout), &buf) == 0 && S_ISFIFO(buf.st_mode))
+		bad = OutputIsPipe;
+	    if (fstat(fileno(stderr), &buf) == 0 && S_ISFIFO(buf.st_mode))
+		bad = OutputIsPipe;
+	}
+#endif
+    }
+    switch (bad) {
+    case NotBad:
+	return;
+    case UnsafeArg:
+	ErrorF("Command line argument number %d is unsafe\n", i);
+	ErrorF(ARGMSG, BUGADDRESS);
+	break;
+    case ArgTooLong:
+	ErrorF("Command line argument number %d is too long\n", i);
+	ErrorF(ARGMSG, BUGADDRESS);
+	break;
+    case UnprintableArg:
+	ErrorF("Command line argument number %d contains unprintable"
+		" characters\n", i);
+	ErrorF(ARGMSG, BUGADDRESS);
+	break;
+    case EnvTooLong:
+	ErrorF("Environment variable `%s' is too long\n", e);
+	ErrorF(ENVMSG, BUGADDRESS);
+	break;
+    case OutputIsPipe:
+	ErrorF("Stdout and/or stderr is a pipe\n");
+	break;
+    case InternalError:
+	ErrorF("Internal Error\n");
+	break;
+    default:
+	ErrorF("Unknown error\n");
+	ErrorF(ARGMSG, BUGADDRESS);
+	ErrorF(ENVMSG, BUGADDRESS);
+	break;
+    }
+    FatalError("X server aborted because of unsafe environment\n");
+}
+
+/*
+ * CheckUserAuthorization: check if the user is allowed to start the
+ * X server.  This usually means some sort of PAM checking, and it is
+ * usually only done for setuid servers (uid != euid).
+ */
+
+#ifdef USE_PAM
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+#include <pwd.h>
+#endif /* USE_PAM */
+
+void
+CheckUserAuthorization(void)
+{
+#ifdef USE_PAM
+    static struct pam_conv conv = {
+	misc_conv,
+	NULL
+    };
+
+    pam_handle_t *pamh = NULL;
+    struct passwd *pw;
+    int retval;
+
+    if (getuid() != geteuid()) {
+	pw = getpwuid(getuid());
+	if (pw == NULL)
+	    FatalError("getpwuid() failed for uid %d\n", getuid());
+
+	retval = pam_start("xserver", pw->pw_name, &conv, &pamh);
+	if (retval != PAM_SUCCESS)
+	    FatalError("pam_start() failed.\n"
+			"\tMissing or mangled PAM config file or module?\n");
+
+	retval = pam_authenticate(pamh, 0);
+	if (retval != PAM_SUCCESS) {
+	    pam_end(pamh, retval);
+	    FatalError("PAM authentication failed, cannot start X server.\n"
+			"\tPerhaps you do not have console ownership?\n");
+	}
+
+	retval = pam_acct_mgmt(pamh, 0);
+	if (retval != PAM_SUCCESS) {
+	    pam_end(pamh, retval);
+	    FatalError("PAM authentication failed, cannot start X server.\n"
+			"\tPerhaps you do not have console ownership?\n");
+	}
+
+	/* this is not a session, so do not do session management */
+	pam_end(pamh, PAM_SUCCESS);
+    }
+#endif
+}
+
+#ifdef __SCO__
+#include <fcntl.h>
+
+static void
+lockit (int fd, short what)
+{
+  struct flock lck;
+
+  lck.l_whence = 0;
+  lck.l_start = 0;
+  lck.l_len = 1;
+  lck.l_type = what;
+
+  (void)fcntl (fd, F_SETLKW, &lck);
+}
+
+/* SCO OpenServer 5 lacks pread/pwrite. Emulate them. */
+ssize_t
+pread (int fd, void *buf, size_t nbytes, off_t offset)
+{
+  off_t saved;
+  ssize_t ret;
+
+  lockit (fd, F_RDLCK);
+  saved = lseek (fd, 0, SEEK_CUR);
+  lseek (fd, offset, SEEK_SET);
+  ret = read (fd, buf, nbytes);
+  lseek (fd, saved, SEEK_SET);
+  lockit (fd, F_UNLCK);
+
+  return ret;
+}
+
+ssize_t
+pwrite (int fd, const void *buf, size_t nbytes, off_t offset)
+{
+  off_t saved;
+  ssize_t ret;
+
+  lockit (fd, F_WRLCK);
+  saved = lseek (fd, 0, SEEK_CUR);
+  lseek (fd, offset, SEEK_SET);
+  ret = write (fd, buf, nbytes);
+  lseek (fd, saved, SEEK_SET);
+  lockit (fd, F_UNLCK);
+
+  return ret;
+}
+#endif /* __SCO__ */