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

6       explain_ftell_or_die - get stream position and report errors
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SYNOPSIS

9       #include <libexplain/ftell.h>
10       long explain_ftell_or_die(FILE *fp);
11       long explain_ftell_on_error(FILE *fp);
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DESCRIPTION

14       The  explain_ftell_or_die  function is used to call the ftell(3) system
15       call. On failure an explanation will be  printed  to  stderr,  obtained
16       from  the explain_ftell(3) function, and then the process terminates by
17       calling exit(EXIT_FAILURE).
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19       The explain_ftell_on_error function is used to call the ftell(3) system
20       call.  On  failure  an  explanation will be printed to stderr, obtained
21       from the explain_ftell(3) function, but still returns to the caller.
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23       fp      The fp, exactly as to be passed to the ftell(3) system call.
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RETURN VALUE

26       The explain_ftell_or_die function only returns on success, see ftell(3)
27       for  more  information. On failure, prints an explanation and exits, it
28       does not return.
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30       The explain_ftell_on_error function always returns the value return  by
31       the wrapped ftell(3) system call.
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EXAMPLE

34       The  explain_ftell_or_die  function is intended to be used in a fashion
35       similar to the following example:
36              long result = explain_ftell_or_die(fp);
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SEE ALSO

39       ftell(3)
40               get stream position
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42       explain_ftell(3)
43               explain ftell(3) errors
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45       exit(2) terminate the calling process
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48       libexplain version 0.40
49       Copyright (C) 2010 Peter Miller
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53                                                       explain_ftell_or_die(3)
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