syscall: add Windows file mapping functions and constants

R=brainman, rsc1, rsc
CC=golang-dev
http://codereview.appspot.com/4375046

Committer: Alex Brainman <alex.brainman@gmail.com>

3 files changed, 110 insertions, 0 deletions

diff --git a/src/pkg/syscall/syscall_windows.go b/src/pkg/syscall/syscall_windows.go
index 1fbb3ccbf..ce1be0021 100644
--- a/src/pkg/syscall/syscall_windows.go
+++ b/src/pkg/syscall/syscall_windows.go
@@ -161,6 +161,12 @@ func NewCallback(fn interface{}) uintptr
 //sys	SetHandleInformation(handle int32, mask uint32, flags uint32) (errno int)
 //sys	FlushFileBuffers(handle int32) (errno int)
 //sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, errno int) = kernel32.GetFullPathNameW
+//sys	CreateFileMapping(fhandle int32, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle int32, errno int) = kernel32.CreateFileMappingW
+//sys	MapViewOfFile(handle int32, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int)
+//sys	UnmapViewOfFile(addr uintptr) (errno int)
+//sys	FlushViewOfFile(addr uintptr, length uintptr) (errno int)
+//sys	VirtualLock(addr uintptr, length uintptr) (errno int)
+//sys	VirtualUnlock(addr uintptr, length uintptr) (errno int)
 
 // syscall interface implementation for other packages
 
diff --git a/src/pkg/syscall/zsyscall_windows_386.go b/src/pkg/syscall/zsyscall_windows_386.go
index f4cfdeed8..ce36ab6c0 100644
--- a/src/pkg/syscall/zsyscall_windows_386.go
+++ b/src/pkg/syscall/zsyscall_windows_386.go
@@ -70,6 +70,12 @@ var (
 	procSetHandleInformation       = getSysProcAddr(modkernel32, "SetHandleInformation")
 	procFlushFileBuffers           = getSysProcAddr(modkernel32, "FlushFileBuffers")
 	procGetFullPathNameW           = getSysProcAddr(modkernel32, "GetFullPathNameW")
+	procCreateFileMappingW         = getSysProcAddr(modkernel32, "CreateFileMappingW")
+	procMapViewOfFile              = getSysProcAddr(modkernel32, "MapViewOfFile")
+	procUnmapViewOfFile            = getSysProcAddr(modkernel32, "UnmapViewOfFile")
+	procFlushViewOfFile            = getSysProcAddr(modkernel32, "FlushViewOfFile")
+	procVirtualLock                = getSysProcAddr(modkernel32, "VirtualLock")
+	procVirtualUnlock              = getSysProcAddr(modkernel32, "VirtualUnlock")
 	procWSAStartup                 = getSysProcAddr(modwsock32, "WSAStartup")
 	procWSACleanup                 = getSysProcAddr(modwsock32, "WSACleanup")
 	procsocket                     = getSysProcAddr(modwsock32, "socket")
@@ -901,6 +907,92 @@ func GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (
 	return
 }
 
+func CreateFileMapping(fhandle int32, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle int32, errno int) {
+	r0, _, e1 := Syscall6(procCreateFileMappingW, 6, uintptr(fhandle), uintptr(unsafe.Pointer(sa)), uintptr(prot), uintptr(maxSizeHigh), uintptr(maxSizeLow), uintptr(unsafe.Pointer(name)))
+	handle = int32(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func MapViewOfFile(handle int32, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int) {
+	r0, _, e1 := Syscall6(procMapViewOfFile, 5, uintptr(handle), uintptr(access), uintptr(offsetHigh), uintptr(offsetLow), uintptr(length), 0)
+	addr = uintptr(r0)
+	if addr == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func UnmapViewOfFile(addr uintptr) (errno int) {
+	r1, _, e1 := Syscall(procUnmapViewOfFile, 1, uintptr(addr), 0, 0)
+	if int(r1) == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func FlushViewOfFile(addr uintptr, length uintptr) (errno int) {
+	r1, _, e1 := Syscall(procFlushViewOfFile, 2, uintptr(addr), uintptr(length), 0)
+	if int(r1) == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func VirtualLock(addr uintptr, length uintptr) (errno int) {
+	r1, _, e1 := Syscall(procVirtualLock, 2, uintptr(addr), uintptr(length), 0)
+	if int(r1) == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func VirtualUnlock(addr uintptr, length uintptr) (errno int) {
+	r1, _, e1 := Syscall(procVirtualUnlock, 2, uintptr(addr), uintptr(length), 0)
+	if int(r1) == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
 func WSAStartup(verreq uint32, data *WSAData) (sockerrno int) {
 	r0, _, _ := Syscall(procWSAStartup, 2, uintptr(verreq), uintptr(unsafe.Pointer(data)), 0)
 	sockerrno = int(r0)
diff --git a/src/pkg/syscall/ztypes_windows_386.go b/src/pkg/syscall/ztypes_windows_386.go
index 3a50be14c..73cfe069b 100644
--- a/src/pkg/syscall/ztypes_windows_386.go
+++ b/src/pkg/syscall/ztypes_windows_386.go
@@ -119,6 +119,18 @@ const (
 	STANDARD_RIGHTS_READ      = 0x00020000
 	PROCESS_QUERY_INFORMATION = 0x00000400
 	SYNCHRONIZE               = 0x00100000
+
+	PAGE_READONLY          = 0x02
+	PAGE_READWRITE         = 0x04
+	PAGE_WRITECOPY         = 0x08
+	PAGE_EXECUTE_READ      = 0x20
+	PAGE_EXECUTE_READWRITE = 0x40
+	PAGE_EXECUTE_WRITECOPY = 0x80
+
+	FILE_MAP_COPY    = 0x01
+	FILE_MAP_WRITE   = 0x02
+	FILE_MAP_READ    = 0x04
+	FILE_MAP_EXECUTE = 0x20
 )
 
 const (