_kexit man page on YellowDog

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KEXIT(2)		       LAM LOCAL LIBRARY		      KEXIT(2)

NAME
       kexit, _kexit, atkexit - Terminate LAM process.

C SYNOPSIS
       int kexit (int errcode);
       int _kexit (int errcode);
       int atkexit (int (*func)(), char *arg);

FORTRAN SYNOPSIS
       subroutine KXIT (errcode)
       integer errcode

DESCRIPTION
       A  LAM  process	that  calls  kenter(2) must call kexit() to terminate.
       kexit() calls all registered LAM exit functions	before	informing  the
       local daemon of its death.

       _kexit() may be used instead of kexit() to avoid calling the exit func‐
       tions.

       The argument to kexit() and _kexit() is an exit code which is sent in a
       message	to the parent process, if requested by the parent process when
       the process was created.	 See rploadgo(2) and rpwait(2).	 By convention
       the exit code is 0 if the process successfully completed.

       An  exit	 function  is  registered by calling atkexit().	 The arguments
       passed to atkexit() are the address of the exit function to  be	called
       upon  kexit(),  and an argument to pass to the exit function when it is
       called.	(Note that the function may ignore the argument, reverting  to
       the  ANSI  standard  C library atexit(3) behavior, where no argument is
       passable.)  There is a limit on how many exit functions may  be	regis‐
       tered.	Exit  functions are called in reverse order of their registra‐
       tion.  Some system modules register their own cleanup functions.

       kexit() eventually calls kdetach(2) to gracefully detach from  the  LAM
       daemon and exit(3) to actually terminate within the host operating sys‐
       tem.

RETURN VALUE
       kexit() and  _kexit()  do  not  return.	 Upon  successful  completion,
       atkexit() returns 0.  Otherwise, -1 is returned and the global variable
       errno is set to indicate the error.

ERRORS
       ENOEXDESCRIPTORS	   There is no room left in the internal table of exit
			   functions.

BUGS
       If too many user functions are registered with atkexit() before calling
       system  functions  that	also  call  atkexit(),	the  latter  calls  to
       atkexit() may fail and some system functions may not be registered.  If
       the missing exit function is for LAM stream file I/O, some output  data
       may be lost.

SEE ALSO
       kdetach(2), kenter(2)

LAM 7.1.2			  March, 2006			      KEXIT(2)
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