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

explain_fseeko_or_die - seek to or report file position and report errors

#include <libexplain/fseeko.h>

void explain_fseeko_or_die(FILE *fp, off_t offset, int whence);
int explain_fseeko_on_error(FILE *fp, off_t offset, int whence);

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

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

fp
The fp, exactly as to be passed to the fseeko(3) system call.
offset
The offset, exactly as to be passed to the fseeko(3) system call.
whence
The whence, exactly as to be passed to the fseeko(3) system call.

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

The explain_fseeko_on_error function always returns the value return by the wrapped fseeko(3) system call.

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

fseeko(3)
seek to or report file position
explain_fseeko(3)
explain fseeko(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
Copyright (C) 2013 Peter Miller

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