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

6       explain_vfprintf_or_die - formatted output conversion and report errors
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SYNOPSIS

9       #include <libexplain/vfprintf.h>
10       void explain_vfprintf_or_die(FILE *fp, const char *format, va_list ap);
11       int  explain_vfprintf_on_error(FILE  *fp,  const  char *format, va_list
12       ap);
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DESCRIPTION

15       The explain_vfprintf_or_die function is used to  call  the  vfprintf(3)
16       system  call.  On  failure  an  explanation  will be printed to stderr,
17       obtained from the explain_vfprintf(3) function, and  then  the  process
18       terminates by calling exit(EXIT_FAILURE).
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20       The  explain_vfprintf_on_error function is used to call the vfprintf(3)
21       system call. On failure an  explanation  will  be  printed  to  stderr,
22       obtained  from  the  explain_vfprintf(3) function, but still returns to
23       the caller.
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25       fp      The fp, exactly as to be passed to the vfprintf(3) system call.
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27       format  The format, exactly as to be passed to the  vfprintf(3)  system
28               call.
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30       ap      The ap, exactly as to be passed to the vfprintf(3) system call.
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RETURN VALUE

33       The  explain_vfprintf_or_die  function  only  returns  on  success, see
34       vfprintf(3) for more information. On failure, prints an explanation and
35       exits, it does not return.
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37       The  explain_vfprintf_on_error function always returns the value return
38       by the wrapped vfprintf(3) system call.
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EXAMPLE

41       The explain_vfprintf_or_die function is intended to be used in a  fash‐
42       ion similar to the following example:
43              explain_vfprintf_or_die(fp, format, ap);
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SEE ALSO

46       vfprintf(3)
47               formatted output conversion
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49       explain_vfprintf(3)
50               explain vfprintf(3) errors
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52       exit(2) terminate the calling process
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55       libexplain version 0.40
56       Copyright (C) 2010 Peter Miller
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60                                                    explain_vfprintf_or_die(3)
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