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Man Pages
explain_fsetpos_or_die(3) FreeBSD Library Functions Manual explain_fsetpos_or_die(3)

explain_fsetpos_or_die - reposition a stream and report errors

#include <libexplain/fsetpos.h>

void explain_fsetpos_or_die(FILE *fp, fpos_t *pos);
int explain_fsetpos_on_error(FILE *fp, fpos_t *pos);

The explain_fsetpos_or_die function is used to call the fsetpos(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fsetpos(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

The explain_fsetpos_on_error function is used to call the fsetpos(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fsetpos(3) function, but still returns to the caller.

fp
The fp, exactly as to be passed to the fsetpos(3) system call.
pos
The pos, exactly as to be passed to the fsetpos(3) system call.

The explain_fsetpos_or_die function only returns on success, see fsetpos(3) for more information. On failure, prints an explanation and exits, it does not return.

The explain_fsetpos_on_error function always returns the value return by the wrapped fsetpos(3) system call.

The explain_fsetpos_or_die function is intended to be used in a fashion similar to the following example:
explain_fsetpos_or_die(fp, pos);

fsetpos(3)
reposition a stream
explain_fsetpos(3)
explain fsetpos(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
Copyright (C) 2010 Peter Miller

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