segmentation fault in fwrite function

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explain_fwrite_or_die

explain_fwrite_or_die(3)				     Library Functions Manual					  explain_fwrite_or_die(3)

NAME

       explain_fwrite_or_die - binary stream output and report errors

SYNOPSIS

       #include <libexplain/fwrite.h>
       size_t explain_fwrite_or_die(const void *ptr, size_t size, size_t nmemb, FILE *fp);

DESCRIPTION

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

       This function is intended to be used in a fashion similar to the following example:
	      size_t result = explain_fwrite_or_die(ptr, size, nmemb, fp);

       ptr     The ptr, exactly as to be passed to the fwrite(3) system call.

       size    The size, exactly as to be passed to the fwrite(3) system call.

       nmemb   The nmemb, exactly as to be passed to the fwrite(3) system call.

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

       Returns:
	       This function only returns on success.  On failure, prints an explanation and exits.

SEE ALSO

       fwrite(3)
	       binary stream output

       explain_fwrite(3)
	       explain fwrite(3) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

															  explain_fwrite_or_die(3)

Programming