1explain_exit(3)            Library Functions Manual            explain_exit(3)
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NAME

6       explain_exit - print an explanation of exit status before exiting
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SYNOPSIS

9       #include <libexplain/libexplain.h>
10       void explain_exit_on_exit(void);
11       void explain_exit_on_error(void);
12       void explain_exit_cancel(void);
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DESCRIPTION

15       The  explain_exit_on_exit function may be used to have the calling pro‐
16       gram print an explanation of its  exit  status  (the  value  passed  to
17       exit(3)  or  the  return  value from main) immediately before it termi‐
18       nates.
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20       The explain_exit_on_error function may be used to have the calling pro‐
21       gram print an explanation of its exit status immediately before it ter‐
22       minates, if that exit status is not EXIT_SUCCESS.
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24       The explain_exit_cancel function may be used to cancel  the  effect  of
25       the explain_exit_on_exit or explain_exit_on_error fucntion.
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27       These  functions  may  be called multiple times, and in any order.  The
28       last called has precedence.  The explanation will never be printed more
29       than once.
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31   Call Exit As Normal
32       In  order  to have the explanation printed, simply call exit(3) as nor‐
33       mal, or return from main as normal.  Do not call any of these functions
34       in  order  to  exit  your program, they are called before you exit your
35       program.
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37   Caveat
38       This functionality is only available on  systems  with  the  on_exit(3)
39       system  call.   Unfortunately,  the atexit(3) system call is not suffi‐
40       ciently capable, as it does not pass the exit status to the  registered
41       function.
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SEE ALSO

44       exit(3) cause normal process termination
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46       atexit(3)
47               register a function to be called at normal process termination
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49       on_exit(3)
50               register a function to be called at normal process termination
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53       libexplain version 0.40
54       Copyright (C) 2009 Peter Miller
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AUTHOR

57       Written by Peter Miller <pmiller@opensource.org.au>
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61                                                               explain_exit(3)
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