TZUTC: -0700   
   MSGID: 53252.syncprog@1:103/705 2d630691   
   PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0   
   TID: SBBSecho 3.30-Linux master/88b423313 Sep 29 2025 GCC 12.2.0   
   BBSID: VERT   
   CHRS: UTF-8 4   
   FORMAT: flowed   
   https://gitlab.synchro.net/main/sbbs/-/commit/7ed974a8719b7e69117f4e63   
   Modified Files:   
   	src/doors/clans-src/src/door.c door.h structs.h system.c   
   Log Message:   
   Use the standard "x" flag with fopen() for online semaphore   
      
   Also, fix the race condition inherent in the check-then-use method.   
   Now, it tries to create the semaphore file using mode "w+bx" and if   
   that fails, someone is online. If it succeeds, nobody is online.   
      
   With this, I'm not sure that the _fsopen() is even needed... will   
   need to go through the maint and ibbs options.   
      
   Also, instead of a binary representation of the node number, use   
   "Node: %d\n"   
      
   Add /EXCLUSIVE option   
      
   This option asserts that there are no other copies of the game   
   running, and it is safe to remove online.flg if it exists.   
      
   Create/test the semaphore before reading dynamic data   
      
   Also, on node 0, wait for the semaphore rather than exit.   
      
   So, it's expected you will set everything up line this:   
   Regular door: clans /Nx /Sx /Dxxxx   
   IBBS import:  clans /I   
   Maint:        clans /M /EXCLUSIVE   
      
   The IBBS import and Maint events need to run on the same node so that   
   an import won't be running at the same time as maint. If that's not   
   possible, leave off the /EXCLUSIVE option to maint, and keep an eye   
   on the flag file because processes will build up waiting on the   
   semfile in the case of a crash.   
   --- SBBSecho 3.30-Linux   
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