From c041eb7ccb55c36d9cded3c55133c0cf9321c801 Mon Sep 17 00:00:00 2001
From: Eric Bollengier <eric@eb.homelinux.org>
Date: Mon, 23 Jun 2008 14:50:05 +0000
Subject: [PATCH] ebl  Add mmap unmmap implementation for win32 and     
 tokyodbm

git-svn-id: https://bacula.svn.sourceforge.net/svnroot/bacula/trunk@7222 91ce42f0-d328-0410-95d8-f526ca767f89
---
 bacula/src/win32/compat/compat.cpp | 64 ++++++++++++++++++++++++++++++
 bacula/src/win32/compat/compat.h   | 10 +++++
 bacula/technotes-2.5               |  2 +
 3 files changed, 76 insertions(+)

diff --git a/bacula/src/win32/compat/compat.cpp b/bacula/src/win32/compat/compat.cpp
index 2583ad2904..9a6fde9694 100644
--- a/bacula/src/win32/compat/compat.cpp
+++ b/bacula/src/win32/compat/compat.cpp
@@ -2349,6 +2349,70 @@ file_dup2(int, int)
 }
 #endif
 
+/* 
+ * Emulation of mmap and unmmap for tokyo dbm
+ */
+void *mmap(void *start, size_t length, int prot, int flags,
+	   int fd, off_t offset)
+{
+   DWORD fm_access = 0;
+   DWORD mv_access = 0;
+   HANDLE h;
+   HANDLE mv;
+
+   if (length == 0) {
+      return MAP_FAILED;
+   }
+   if (!fd) {
+      return MAP_FAILED;
+   }
+
+   if (flags & PROT_WRITE) {
+      fm_access |= PAGE_READWRITE;
+   } else if (flags & PROT_READ) {
+      fm_access |= PAGE_READONLY;
+   }
+   
+   if (flags & PROT_READ) {
+      mv_access |= FILE_MAP_READ;
+   }
+   if (flags & PROT_WRITE) {
+      mv_access |= FILE_MAP_WRITE;
+   }
+
+   h = CreateFileMapping((HANDLE)_get_osfhandle (fd), 
+			 NULL /* security */, 
+			 fm_access, 
+			 0 /* MaximumSizeHigh */, 
+			 0 /* MaximumSizeLow */, 
+			 NULL /* name of the file mapping object */);
+
+   if (!h || h == INVALID_HANDLE_VALUE) {
+      return MAP_FAILED;
+   }
+
+   mv = MapViewOfFile(h, mv_access, 
+		      0 /* offset hi */, 
+		      0 /* offset lo */,
+		      length);
+   CloseHandle(h);
+
+   if (!mv || mv == INVALID_HANDLE_VALUE) {
+      return MAP_FAILED;
+   }
+
+   return (void *) mv;
+}
+
+int munmap(void *start, size_t length)
+{
+   if (!start) {
+      return -1;
+   }
+   UnmapViewOfFile(start);
+   return 0;
+}
+
 #ifdef HAVE_MINGW
 /* syslog function, added by Nicolas Boichat */
 void openlog(const char *ident, int option, int facility) {}  
diff --git a/bacula/src/win32/compat/compat.h b/bacula/src/win32/compat/compat.h
index 01802706ac..1a1be74b74 100644
--- a/bacula/src/win32/compat/compat.h
+++ b/bacula/src/win32/compat/compat.h
@@ -379,4 +379,14 @@ int win32_ftruncate(int fd, int64_t length);
 #undef ftruncate
 #define ftruncate win32_ftruncate
 
+/* mmap implementation for tokyodbm */
+#define PROT_WRITE 0x2             /* Page can be written.  */
+#define PROT_READ  0x1             /* page can be read */
+#define MAP_SHARED 0x01            /* Share changes.  */
+#define MAP_FAILED ((void *) -1)
+
+void *mmap(void *start, size_t length, int prot, int flags,
+	   int fd, off_t offset);
+int munmap(void *start, size_t length);
+
 #endif /* __COMPAT_H_ */
diff --git a/bacula/technotes-2.5 b/bacula/technotes-2.5
index 7d4f3ca543..f8bfd299c7 100644
--- a/bacula/technotes-2.5
+++ b/bacula/technotes-2.5
@@ -30,6 +30,8 @@ vtape driver
 
 
 General:
+23Jun08
+ebl  Add mmap/unmmap implementation for tokyodbm under win32
 kes  Make first step toward eliminating globals from config
      scanning. Also should be a workaround for FORTIFY_SOURCE
      GNU C bug -- fixes bug #1042.
-- 
2.39.5