IABSD.fr/xenocara/app/xsm/lock.c

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  Commit

• Author : matthieu
  Date : 2018-05-21 18:33:48
  Hash : 3a44be17
  Message : Update to xsm 1.0.4

• app/xsm/lock.c

• /* $Xorg: lock.c,v 1.4 2001/02/09 02:05:59 xorgcvs Exp $ */
  /******************************************************************************
  
  Copyright 1994, 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.
  ******************************************************************************/
  /* $XFree86: xc/programs/xsm/lock.c,v 3.4 2001/12/14 20:02:25 dawes Exp $ */
  
  #include "xsm.h"
  #include "lock.h"
  #include "choose.h"
  #include <sys/types.h>
  
  
  static const char *
  GetPath(void)
  {
      const char *path = getenv ("SM_SAVE_DIR");
  
      if (!path)
      {
  	path = getenv ("HOME");
  	if (!path)
  	    path = ".";
      }
  
      return (path);
  }
  
  
  Status
  LockSession(const char *session_name, Bool write_id)
  {
      const char *path;
      char lock_file[PATH_MAX];
      char temp_lock_file[PATH_MAX];
      Status status;
      int fd;
  
      path = GetPath ();
  
      snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s",
  	      path, session_name);
      snprintf (temp_lock_file, sizeof(temp_lock_file), "%s/.XSMtlock-%s",
  	      path, session_name);
  
      if ((fd = creat (temp_lock_file, 0444)) < 0)
  	return (0);
  
      if ((write_id &&
          (write (fd, networkIds, strlen (networkIds)) != strlen (networkIds))) ||
  	(write (fd, "\n", 1) != 1))
      {
  	close (fd);
  	return (0);
      }
  
      close (fd);
  
      status = 1;
  
      if (link (temp_lock_file, lock_file) < 0)
  	status = 0;
  
      if (remove (temp_lock_file) < 0)
  	status = 0;
  
      return (status);
  }
  
  
  void
  UnlockSession(const char *session_name)
  {
      const char *path;
      char lock_file[PATH_MAX];
  
      path = GetPath ();
  
      snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s",
  	      path, session_name);
  
      remove (lock_file);
  }
  
  
  char *
  GetLockId(const char *session_name)
  {
      const char *path;
      FILE *fp;
      char lock_file[PATH_MAX];
      char buf[256];
      char *ret;
  
      path = GetPath ();
  
      snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s",
  	      path, session_name);
  
      if ((fp = fopen (lock_file, "r")) == NULL)
      {
  	return (NULL);
      }
      fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
  
      buf[0] = '\0';
      fscanf (fp, "%255s\n", buf);
      ret = XtNewString (buf);
  
      fclose (fp);
  
      return (ret);
  }
  
  
  Bool
  CheckSessionLocked(const char *session_name, Bool get_id, char **id_ret)
  {
      if (get_id)
  	*id_ret = GetLockId (session_name);
  
      if (!LockSession (session_name, False))
  	return (1);
  
      UnlockSession (session_name);
      return (0);
  }
  
  
  void
  UnableToLockSession(const char *session_name)
  {
      /*
       * We should popup a dialog here giving error.
       */
  
  #ifdef XKB
      XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_Failure);
  #else
      XBell (XtDisplay (topLevel), 0);
  #endif
      sleep (2);
  
      ChooseSession ();
  }