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84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* Program: Unix compatibility routines
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*
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* Author: Mark Crispin
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* Networks and Distributed Computing
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* Computing & Communications
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* University of Washington
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* Administration Building, AG-44
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* Seattle, WA 98195
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* Internet: MRC@CAC.Washington.EDU
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*
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* Date: 14 September 1996
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* Last Edited: 14 August 1997
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*
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* Copyright 1997 by the University of Washington
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appears in all copies and that both the
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* above copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the University of Washington not be
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* used in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. This software is made available
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* "as is", and
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* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
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* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
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* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
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* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/* DEDICATION
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* This file is dedicated to my dog, Unix, also known as Yun-chan and
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* Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast. Unix
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* passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
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* a two-month bout with cirrhosis of the liver.
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*
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* He was a dear friend, and I miss him terribly.
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*
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* Lift a leg, Yunie. Luv ya forever!!!!
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*/
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#include <windows.h>
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#include <io.h>
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#include <errno.h>
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#include "flock.h"
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int flock(int fd, int op)
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{
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HANDLE hdl = (HANDLE) _get_osfhandle(fd);
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DWORD low = 1, high = 0;
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OVERLAPPED offset =
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{0, 0, 0, 0, NULL};
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if (hdl < 0)
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return -1; /* error in file descriptor */
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/* bug for bug compatible with Unix */
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UnlockFileEx(hdl, 0, low, high, &offset);
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switch (op & ~LOCK_NB) { /* translate to LockFileEx() op */
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case LOCK_EX: /* exclusive */
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if (LockFileEx(hdl, LOCKFILE_EXCLUSIVE_LOCK +
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((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
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0, low, high, &offset))
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return 0;
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break;
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case LOCK_SH: /* shared */
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if (LockFileEx(hdl, ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
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0, low, high, &offset))
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return 0;
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break;
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case LOCK_UN: /* unlock */
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return 0; /* always succeeds */
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default: /* default */
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break;
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}
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errno = EINVAL; /* bad call */
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return -1;
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}
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