_kexit(2)

1KEXIT(2)                       LAM LOCAL LIBRARY                      KEXIT(2)
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NAME

6       kexit, _kexit, atkexit - Terminate LAM process.
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C SYNOPSIS

9       int kexit (int errcode);
10       int _kexit (int errcode);
11       int atkexit (int (*func)(), char *arg);
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FORTRAN SYNOPSIS

14       subroutine KXIT (errcode)
15       integer errcode
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DESCRIPTION

18       A  LAM  process  that  calls  kenter(2) must call kexit() to terminate.
19       kexit() calls all registered LAM exit functions  before  informing  the
20       local daemon of its death.
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22       _kexit() may be used instead of kexit() to avoid calling the exit func‐
23       tions.
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25       The argument to kexit() and _kexit() is an exit code which is sent in a
26       message  to the parent process, if requested by the parent process when
27       the process was created.  See rploadgo(2) and rpwait(2).  By convention
28       the exit code is 0 if the process successfully completed.
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30       An  exit  function  is  registered by calling atkexit().  The arguments
31       passed to atkexit() are the address of the exit function to  be  called
32       upon  kexit(),  and an argument to pass to the exit function when it is
33       called.  (Note that the function may ignore the argument, reverting  to
34       the  ANSI  standard  C library atexit(3) behavior, where no argument is
35       passable.)  There is a limit on how many exit functions may  be  regis‐
36       tered.   Exit  functions are called in reverse order of their registra‐
37       tion.  Some system modules register their own cleanup functions.
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39       kexit() eventually calls kdetach(2) to gracefully detach from  the  LAM
40       daemon and exit(3) to actually terminate within the host operating sys‐
41       tem.
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RETURN VALUE

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

49       ENOEXDESCRIPTORS    There is no room left in the internal table of exit
50                           functions.
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BUGS

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