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| 1 | /* $Header: /cvsup/minix/src/lib/ack/libp/wf.c,v 1.1 2005/10/10 15:27:47 beng Exp $ */
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| 2 | /*
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| 3 | * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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| 4 | *
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| 5 | * This product is part of the Amsterdam Compiler Kit.
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| 6 | *
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| 7 | * Permission to use, sell, duplicate or disclose this software must be
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| 8 | * obtained in writing. Requests for such permissions may be sent to
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| 9 | *
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| 10 | * Dr. Andrew S. Tanenbaum
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| 11 | * Wiskundig Seminarium
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| 12 | * Vrije Universiteit
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| 13 | * Postbox 7161
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| 14 | * 1007 MC Amsterdam
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| 15 | * The Netherlands
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| 16 | *
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| 17 | */
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| 18 |
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| 19 | #include <pc_file.h>
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| 20 | #include <pc_err.h>
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| 21 |
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| 22 | extern struct file *_curfil;
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| 23 | extern _trp();
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| 24 |
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| 25 | _wf(f) struct file *f; {
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| 26 |
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| 27 | _curfil = f;
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| 28 | if ((f->flags&0377) != MAGIC)
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| 29 | _trp(EBADF);
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| 30 | if ((f->flags & WRBIT) == 0)
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| 31 | _trp(EWRITEF);
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| 32 | }
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