minix/lib/ack/libp/wf.c

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/* $Header$ */
/*
* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
*
* This product is part of the Amsterdam Compiler Kit.
*
* Permission to use, sell, duplicate or disclose this software must be
* obtained in writing. Requests for such permissions may be sent to
*
* Dr. Andrew S. Tanenbaum
* Wiskundig Seminarium
* Vrije Universiteit
* Postbox 7161
* 1007 MC Amsterdam
* The Netherlands
*
*/
#include <pc_file.h>
#include <pc_err.h>
extern struct file *_curfil;
extern _trp();
_wf(f) struct file *f; {
_curfil = f;
if ((f->flags&0377) != MAGIC)
_trp(EBADF);
if ((f->flags & WRBIT) == 0)
_trp(EWRITEF);
}