Merge pull request #51 from darrenstahlmsft/NoCGO

Remove cgo as a dependency added by #49

pipe.go

@@ -2,9 +2,6 @@
 
 package winio
 
-// #include <stdlib.h>
-import "C"
-
 import (
 	"errors"
 	"io"
@@ -21,10 +18,12 @@ import (
 //sys waitNamedPipe(name string, timeout uint32) (err error) = WaitNamedPipeW
 //sys getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
 //sys getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
+//sys localAlloc(uFlags uint32, length uint32) (ptr uintptr) = LocalAlloc
+//sys copyMemory(dst uintptr, src uintptr, length uint32) = RtlCopyMemory
 
 type securityAttributes struct {
 	Length             uint32
-	SecurityDescriptor unsafe.Pointer
+	SecurityDescriptor uintptr
 	InheritHandle      uint32
 }
 
@@ -237,8 +236,10 @@ func makeServerPipeHandle(path string, securityDescriptor []byte, c *PipeConfig,
 	sa := &securityAttributes{}
 	sa.Length = uint32(unsafe.Sizeof(*sa))
 	if securityDescriptor != nil {
-		sa.SecurityDescriptor = C.CBytes(securityDescriptor)
-		defer C.free(sa.SecurityDescriptor)
+		len := uint32(len(securityDescriptor))
+		sa.SecurityDescriptor = localAlloc(0, len)
+		defer localFree(sa.SecurityDescriptor)
+		copyMemory(sa.SecurityDescriptor, uintptr(unsafe.Pointer(&securityDescriptor[0])), len)
 	}
 	h, err := createNamedPipe(path, flags, mode, cPIPE_UNLIMITED_INSTANCES, uint32(c.OutputBufferSize), uint32(c.InputBufferSize), 0, sa)
 	if err != nil {

zsyscall_windows.go

@@ -52,6 +52,8 @@ var (
 	procWaitNamedPipeW                                       = modkernel32.NewProc("WaitNamedPipeW")
 	procGetNamedPipeInfo                                     = modkernel32.NewProc("GetNamedPipeInfo")
 	procGetNamedPipeHandleStateW                             = modkernel32.NewProc("GetNamedPipeHandleStateW")
+	procLocalAlloc                                           = modkernel32.NewProc("LocalAlloc")
+	procRtlCopyMemory                                        = modkernel32.NewProc("RtlCopyMemory")
 	procLookupAccountNameW                                   = modadvapi32.NewProc("LookupAccountNameW")
 	procConvertSidToStringSidW                               = modadvapi32.NewProc("ConvertSidToStringSidW")
 	procConvertStringSecurityDescriptorToSecurityDescriptorW = modadvapi32.NewProc("ConvertStringSecurityDescriptorToSecurityDescriptorW")
@@ -228,6 +230,17 @@ func getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *u
 	return
 }
 
+func localAlloc(uFlags uint32, length uint32) (ptr uintptr) {
+	r0, _, _ := syscall.Syscall(procLocalAlloc.Addr(), 2, uintptr(uFlags), uintptr(length), 0)
+	ptr = uintptr(r0)
+	return
+}
+
+func copyMemory(dst uintptr, src uintptr, length uint32) {
+	syscall.Syscall(procRtlCopyMemory.Addr(), 3, uintptr(dst), uintptr(src), uintptr(length))
+	return
+}
+
 func lookupAccountName(systemName *uint16, accountName string, sid *byte, sidSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) {
 	var _p0 *uint16
 	_p0, err = syscall.UTF16PtrFromString(accountName)