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Diffstat (limited to 'win32/flock.c')
| -rw-r--r-- | win32/flock.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/win32/flock.c b/win32/flock.c new file mode 100644 index 0000000000..cc9d409784 --- /dev/null +++ b/win32/flock.c @@ -0,0 +1,83 @@ +/* + * Program: Unix compatibility routines + * + * Author: Mark Crispin + * Networks and Distributed Computing + * Computing & Communications + * University of Washington + * Administration Building, AG-44 + * Seattle, WA 98195 + * Internet: MRC@CAC.Washington.EDU + * + * Date: 14 September 1996 + * Last Edited: 14 August 1997 + * + * Copyright 1997 by the University of Washington + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for any purpose and without fee is hereby granted, provided + * that the above copyright notice appears in all copies and that both the + * above copyright notice and this permission notice appear in supporting + * documentation, and that the name of the University of Washington not be + * used in advertising or publicity pertaining to distribution of the software + * without specific, written prior permission. This software is made available + * "as is", and + * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, + * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN + * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT + * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION + * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + + +/* DEDICATION + + * This file is dedicated to my dog, Unix, also known as Yun-chan and + * Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast. Unix + * passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after + * a two-month bout with cirrhosis of the liver. + * + * He was a dear friend, and I miss him terribly. + * + * Lift a leg, Yunie. Luv ya forever!!!! + */ + +#include <windows.h> +#include <io.h> +#include <errno.h> +#include "flock.h" + +int flock(int fd, int op) +{ + HANDLE hdl = (HANDLE) _get_osfhandle(fd); + DWORD low = 1, high = 0; + OVERLAPPED offset = + {0, 0, 0, 0, NULL}; + if (hdl < 0) + return -1; /* error in file descriptor */ + /* bug for bug compatible with Unix */ + UnlockFileEx(hdl, 0, low, high, &offset); + switch (op & ~LOCK_NB) { /* translate to LockFileEx() op */ + case LOCK_EX: /* exclusive */ + if (LockFileEx(hdl, LOCKFILE_EXCLUSIVE_LOCK + + ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0), + 0, low, high, &offset)) + return 0; + break; + case LOCK_SH: /* shared */ + if (LockFileEx(hdl, ((op & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0), + 0, low, high, &offset)) + return 0; + break; + case LOCK_UN: /* unlock */ + return 0; /* always succeeds */ + default: /* default */ + break; + } + errno = EINVAL; /* bad call */ + return -1; +} |