Return to flock.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / php / win32

php

    1: /*
    2:  * Program:   Unix compatibility routines
    3:  *
    4:  * Author:  Mark Crispin
    5:  *      Networks and Distributed Computing
    6:  *      Computing & Communications
    7:  *      University of Washington
    8:  *      Administration Building, AG-44
    9:  *      Seattle, WA  98195
   10:  *      Internet: MRC@CAC.Washington.EDU
   11:  *
   12:  * Date:    14 September 1996
   13:  * Last Edited: 14 August 1997
   14:  *
   15:  * Copyright 1997 by the University of Washington
   16:  *
   17:  *  Permission to use, copy, modify, and distribute this software and its
   18:  * documentation for any purpose and without fee is hereby granted, provided
   19:  * that the above copyright notice appears in all copies and that both the
   20:  * above copyright notice and this permission notice appear in supporting
   21:  * documentation, and that the name of the University of Washington not be
   22:  * used in advertising or publicity pertaining to distribution of the software
   23:  * without specific, written prior permission.  This software is made available
   24:  * "as is", and
   25:  * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
   26:  * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
   27:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
   28:  * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
   29:  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   30:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
   31:  * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
   32:  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   33:  *
   34:  */
   35: 
   36: 
   37: /*              DEDICATION
   38: 
   39:  *  This file is dedicated to my dog, Unix, also known as Yun-chan and
   40:  * Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast.  Unix
   41:  * passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
   42:  * a two-month bout with cirrhosis of the liver.
   43:  *
   44:  *  He was a dear friend, and I miss him terribly.
   45:  *
   46:  *  Lift a leg, Yunie.  Luv ya forever!!!!
   47:  */
   48: 
   49: #include "php.h"
   50: #include <windows.h>
   51: #include <io.h>
   52: #include <errno.h>
   53: #include "flock.h"
   54: 
   55: PHPAPI int flock(int fd, int op)
   56: {
   57: 	HANDLE hdl = (HANDLE) _get_osfhandle(fd);
   58: 	DWORD low = 1, high = 0;
   59: 	OVERLAPPED offset =
   60: 	{0, 0, 0, 0, NULL};
   61: 	if (hdl < 0)
   62: 		return -1;				/* error in file descriptor */
   63: 	/* bug for bug compatible with Unix */
   64: 	UnlockFileEx(hdl, 0, low, high, &offset);
   65: 	switch (op & ~LOCK_NB) {	/* translate to LockFileEx() op */
   66: 		case LOCK_EX:			/* exclusive */
   67: 			if (LockFileEx(hdl, LOCKFILE_EXCLUSIVE_LOCK +
   68: 						((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
   69: 						   0, low, high, &offset))
   70: 				return 0;
   71: 			break;
   72: 		case LOCK_SH:			/* shared */
   73: 			if (LockFileEx(hdl, ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0),
   74: 						   0, low, high, &offset))
   75: 				return 0;
   76: 			break;
   77: 		case LOCK_UN:			/* unlock */
   78: 			return 0;			/* always succeeds */
   79: 		default:				/* default */
   80: 			break;
   81: 	}
   82: 	errno = EINVAL;				/* bad call */
   83: 	return -1;
   84: }