utils.c

远程桌面连接工具

/* $TOG: utils.c /main/128 1997/06/01 13:50:39 sekhar $ */
/*

Copyright (c) 1987  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

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 X CONSORTIUM 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 X Consortium 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 X Consortium.


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 3.27.2.6 1998/02/20 15:13:58 robin Exp $ */

#ifdef WIN32
#include <X11/Xwinsock.h>
#endif
#include "Xos.h"
#include <stdio.h>
#include "misc.h"
#include "X.h"
#include "input.h"
#include "opaque.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
#if !defined(SYSV) && !defined(AMOEBA) && !defined(_MINIX) && !defined(WIN32) && !defined(Lynx)
#include <sys/resource.h>
#endif
#if defined(AIXV3) || defined(HPUX_10)
# include <sys/resource.h>
#endif
#include <time.h>
#include <sys/stat.h>
#include <ctype.h>    /* for isspace */
#if NeedVarargsPrototypes
#include <stdarg.h>
#endif

#ifdef AMOEBA
#include "osdep.h"
#include <amoeba.h>
#include <module/mutex.h>

static mutex print_lock;
#endif

#if defined(__STDC__) || defined(AMOEBA)
/* DHD: SVR4.0 has a prototype for abs() in stdlib.h */
/* DHD: might be better to move this include higher up? */
#ifdef abs
#undef abs
#endif
#ifndef NOSTDHDRS
#include <stdlib.h>	/* for malloc() */
#endif
#endif

extern char *display;

extern CARD32 defaultScreenSaverTime;	/* for parsing command line */
extern CARD32 defaultScreenSaverInterval;
extern int defaultScreenSaverBlanking;
extern int defaultBackingStore;
extern Bool disableBackingStore;
extern Bool disableSaveUnders;
extern Bool PartialNetwork;
#ifndef NOLOGOHACK
extern int logoScreenSaver;
#endif
#ifdef RLIMIT_DATA
extern int limitDataSpace;
#endif
#ifdef RLIMIT_STACK
extern int limitStackSpace;
#endif
#ifdef RLIMIT_NOFILE
extern int limitNoFile;
#endif
extern int defaultColorVisualClass;
extern Bool permitOldBugs;
extern int monitorResolution;
extern Bool defeatAccessControl;
#ifdef SERVER_LOCK
static Bool nolock = FALSE;
#endif

extern char* protNoListen;

Bool CoreDump;
Bool noTestExtensions;

int auditTrailLevel = 1;

void ddxUseMsg();
#if NeedVarargsPrototypes
void VErrorF(char*, va_list);
#endif

#ifdef DEBUG
#ifndef SPECIAL_MALLOC
#define MEMBUG
#endif
#endif

#ifdef MEMBUG
#define MEM_FAIL_SCALE 100000
long Memory_fail = 0;
#ifdef linux
#include <stdlib.h>  /* for random() */
#endif
#endif

#ifdef sgi
int userdefinedfontpath = 0;
#endif /* sgi */

Bool Must_have_memory = FALSE;

char *dev_tty_from_init = NULL;		/* since we need to parse it anyway */

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
}

#include <errno.h>
extern int errno;

#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 __EMX__
#define LOCK_DIR "/tmp"
#define LOCK_TMP_PREFIX "/.tX"
#define LOCK_PREFIX "/.X"
#define LOCK_SUFFIX "-lock"
#else
#define LOCK_TMP_PREFIX "/xf86$"
#define LOCK_PREFIX "/xf86_"
#define LOCK_SUFFIX ".lck"
#endif

#ifdef _MINIX
#include <limits.h>	/* For PATH_MAX */
#endif

#ifdef __EMX__
#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];

/*
 * 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()
{
#ifndef AMOEBA
  char tmp[PATH_MAX], pid_str[12];
  int lfd, i, haslock, l_pid, t;
  char *tmppath = NULL;
  int len;

  if (nolock) return;
  /*
   * Path names
   */
#ifndef __EMX__
  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

  len = strlen(LOCK_PREFIX) > strlen(LOCK_TMP_PREFIX) ? strlen(LOCK_PREFIX) :
						strlen(LOCK_TMP_PREFIX);
  len += strlen(tmppath) + strlen(display) + strlen(LOCK_SUFFIX) + 1;
  if (len > sizeof(LockFile))
    FatalError("Display name `%s' is too long\n");
  (void)sprintf(tmp, "%s" LOCK_TMP_PREFIX "%s" LOCK_SUFFIX, tmppath, display);
  (void)sprintf(LockFile, "%s" LOCK_PREFIX "%s" LOCK_SUFFIX, tmppath, display);

  /*
   * 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, "%10d\n", getpid());
  (void) write(lfd, pid_str, 11);
#ifndef __EMX__
#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",
		   display, "\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;
#endif /* !AMOEBA */
}

/*
 * UnlockServer --
 *      Remove the server lock file.
 */
void
UnlockServer()
{
#ifndef AMOEBA
  if (nolock) return;

  if (!StillLocking){

#ifdef __EMX__
  (void) chmod(LockFile,S_IREAD|S_IWRITE);
#endif /* __EMX__ */
  (void) unlink(LockFile);
  }
#endif

}
#endif /* SERVER_LOCK */

/* Force connections to close on SIGHUP from init */

/*ARGSUSED*/
SIGVAL
AutoResetServer (sig)
    int sig;
{
    dispatchException |= DE_RESET;
    isItTimeToYield = TRUE;
#ifdef GPROF
    chdir ("/tmp");
    exit (0);
#endif
#if defined(SYSV) && defined(X_NOT_POSIX)
    OsSignal (SIGHUP, AutoResetServer);
#endif
#ifdef AMOEBA
    WakeUpMainThread();
#endif
}

/* Force connections to close and then exit on SIGTERM, SIGINT */

/*ARGSUSED*/
SIGVAL
GiveUp(sig)
    int sig;
{
    dispatchException |= DE_TERMINATE;
    isItTimeToYield = TRUE;
#if defined(SYSV) && defined(X_NOT_POSIX)
    if (sig)
	OsSignal(sig, SIG_IGN);
#endif
#ifdef AMOEBA
    WakeUpMainThread();
#endif
}

#if __GNUC__
static void AbortServer() __attribute__((noreturn));
#endif

static void
AbortServer()
{
    extern void AbortDDX();

    OsCleanup();
    AbortDDX();
    fflush(stderr);
#ifdef AMOEBA
    IOPCleanUp();
#endif
    if (CoreDump)
	abort();
    exit (1);
}

void
Error(str)
    char *str;
{
#ifdef AMOEBA
    mu_lock(&print_lock);
#endif
    perror(str);
#ifdef AMOEBA
    mu_unlock(&print_lock);
#endif
}

#ifndef DDXTIME
CARD32
GetTimeInMillis()
{
#ifndef AMOEBA
    struct timeval  tp;

    X_GETTIMEOFDAY(&tp);
    return(tp.tv_sec * 1000) + (tp.tv_usec / 1000);
#else
    return sys_milli();
#endif
}
#endif

AdjustWaitForDelay (waitTime, newdelay)
    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()
{
#if !defined(AIXrt) && !defined(AIX386)
#ifndef AMOEBA
    ErrorF("use: X [:<display>] [option]\n");
#else