From 54df2afaa61c6a03cbb4a33c9b90fa572b6d07b8 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <jesse@jesterpm.net>
Date: Sat, 17 Dec 2016 21:28:53 -0800
Subject: Berkeley DB 4.8 with rust build script for linux.

---
 db-4.8.30/os_windows/os_flock.c | 88 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 db-4.8.30/os_windows/os_flock.c

(limited to 'db-4.8.30/os_windows/os_flock.c')

diff --git a/db-4.8.30/os_windows/os_flock.c b/db-4.8.30/os_windows/os_flock.c
new file mode 100644
index 0000000..df2492f
--- /dev/null
+++ b/db-4.8.30/os_windows/os_flock.c
@@ -0,0 +1,88 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997-2009 Oracle.  All rights reserved.
+ *
+ * $Id$
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+
+/*
+ * __os_fdlock --
+ *	Acquire/release a lock on a byte in a file.
+ */
+int
+__os_fdlock(env, fhp, offset, acquire, nowait)
+	ENV *env;
+	DB_FH *fhp;
+	int acquire, nowait;
+	off_t offset;
+{
+#ifdef DB_WINCE
+	/*
+	 * This functionality is not supported by WinCE, so just fail.
+	 *
+	 * Should only happen if an app attempts to open an environment
+	 * with the DB_REGISTER flag.
+	 */
+	 __db_errx(env, "fdlock API not implemented for WinCE, DB_REGISTER "
+	     "environment flag not supported.");
+	return (EFAULT);
+#else
+	DWORD low, high;
+	DB_ENV *dbenv;
+	OVERLAPPED over;
+	int ret;
+
+	dbenv = env == NULL ? NULL : env->dbenv;
+
+	DB_ASSERT(env,
+	    F_ISSET(fhp, DB_FH_OPENED) && fhp->handle != INVALID_HANDLE_VALUE);
+
+	if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
+		__db_msg(env,
+		    "fileops: flock %s %s offset %lu",
+		    fhp->name, acquire ? "acquire": "release", (u_long)offset);
+
+	/*
+	 * Windows file locking interferes with read/write operations, so we
+	 * map the ranges to an area past the end of the file.
+	 */
+	DB_ASSERT(env, offset < (u_int64_t)INT64_MAX);
+	offset = UINT64_MAX - offset;
+	low = (DWORD)offset;
+	high = (DWORD)(offset >> 32);
+
+	if (acquire) {
+		if (nowait)
+			RETRY_CHK_EINTR_ONLY(
+			    !LockFile(fhp->handle, low, high, 1, 0), ret);
+		else if (__os_is_winnt()) {
+			memset(&over, 0, sizeof(over));
+			over.Offset = low;
+			over.OffsetHigh = high;
+			RETRY_CHK_EINTR_ONLY(
+			    !LockFileEx(fhp->handle, LOCKFILE_EXCLUSIVE_LOCK,
+			    0, 1, 0, &over),
+			    ret);
+		} else {
+			/* Windows 9x/ME doesn't support a blocking call. */
+			for (;;) {
+				RETRY_CHK_EINTR_ONLY(
+				    !LockFile(fhp->handle, low, high, 1, 0),
+				    ret);
+				if (__os_posix_err(ret) != EAGAIN)
+					break;
+				__os_yield(env, 1, 0);
+			}
+		}
+	} else
+		RETRY_CHK_EINTR_ONLY(
+		    !UnlockFile(fhp->handle, low, high, 1, 0), ret);
+
+	return (__os_posix_err(ret));
+#endif
+}
-- 
cgit v1.2.3