syscall: add windows version of Pipe()

R=brainman, rsc
CC=golang-dev
https://golang.org/cl/1715046

src/pkg/syscall/syscall_windows.go

@@ -138,6 +138,8 @@ func getSysProcAddr(m uint32, pname string) uintptr {
 //sys	DuplicateHandle(hSourceProcessHandle int32, hSourceHandle int32, hTargetProcessHandle int32, lpTargetHandle *int32, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (ok bool, errno int)
 //sys	WaitForSingleObject(handle int32, waitMilliseconds uint32) (event uint32, errno int) [failretval=0xffffffff]
 //sys	GetTempPath(buflen uint32, buf *uint16) (n uint32, errno int) = GetTempPathW
+//sys	CreatePipe(readhandle *uint32, writehandle *uint32, lpsa *byte, size uint32) (ok bool, errno int)
+//sys	GetFileType(filehandle uint32) (n uint32, errno int)
 //sys	CryptAcquireContext(provhandle *uint32, container *uint16, provider *uint16, provtype uint32, flags uint32) (ok bool, errno int) = advapi32.CryptAcquireContextW
 //sys	CryptReleaseContext(provhandle uint32, flags uint32) (ok bool, errno int) = advapi32.CryptReleaseContext
 //sys	CryptGenRandom(provhandle uint32, buflen uint32, buf *byte) (ok bool, errno int) = advapi32.CryptGenRandom
@@ -261,6 +263,11 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, errno int) {
 	}
 	hi := int32(offset >> 32)
 	lo := int32(offset)
+	// use GetFileType to check pipe, pipe can't do seek
+	ft, _ := GetFileType(uint32(fd))
+	if ft == FILE_TYPE_PIPE {
+		return 0, EPIPE
+	}
 	rlo, e := SetFilePointer(int32(fd), lo, &hi, w)
 	if e != 0 {
 		return 0, e
@@ -388,6 +395,19 @@ func Sleep(nsec int64) (errno int) {
 	return 0
 }
 
+func Pipe(p []int) (errno int) {
+	if len(p) != 2 {
+		return EINVAL
+	}
+	var r, w uint32
+	if ok, errno := CreatePipe(&r, &w, nil, 0); !ok {
+		return errno
+	}
+	p[0] = int(r)
+	p[1] = int(w)
+	return 0
+}
+
 // TODO(brainman): implement Utimes, or rewrite os.file.Chtimes() instead
 func Utimes(path string, tv []Timeval) (errno int) {
 	return EWINDOWS
@@ -605,8 +625,6 @@ func Getgroups() (gids []int, errno int) { return nil, EWINDOWS }
 
 // TODO(brainman): fix all this meaningless code, it is here to compile exec.go
 
-func Pipe(p []int) (errno int) { return EWINDOWS }
-
 func read(fd int, buf *byte, nbuf int) (n int, errno int) {
 	return 0, EWINDOWS
 }

src/pkg/syscall/zsyscall_windows_386.go

@@ -47,6 +47,8 @@ var (
 	procDuplicateHandle            = getSysProcAddr(modkernel32, "DuplicateHandle")
 	procWaitForSingleObject        = getSysProcAddr(modkernel32, "WaitForSingleObject")
 	procGetTempPathW               = getSysProcAddr(modkernel32, "GetTempPathW")
+	procCreatePipe                 = getSysProcAddr(modkernel32, "CreatePipe")
+	procGetFileType                = getSysProcAddr(modkernel32, "GetFileType")
 	procCryptAcquireContextW       = getSysProcAddr(modadvapi32, "CryptAcquireContextW")
 	procCryptReleaseContext        = getSysProcAddr(modadvapi32, "CryptReleaseContext")
 	procCryptGenRandom             = getSysProcAddr(modadvapi32, "CryptGenRandom")
@@ -591,6 +593,36 @@ func GetTempPath(buflen uint32, buf *uint16) (n uint32, errno int) {
 	return
 }
 
+func CreatePipe(readhandle *uint32, writehandle *uint32, lpsa *byte, size uint32) (ok bool, errno int) {
+	r0, _, e1 := Syscall6(procCreatePipe, uintptr(unsafe.Pointer(readhandle)), uintptr(unsafe.Pointer(writehandle)), uintptr(unsafe.Pointer(lpsa)), uintptr(size), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func GetFileType(filehandle uint32) (n uint32, errno int) {
+	r0, _, e1 := Syscall(procGetFileType, uintptr(filehandle), 0, 0)
+	n = uint32(r0)
+	if n == 0 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
 func CryptAcquireContext(provhandle *uint32, container *uint16, provider *uint16, provtype uint32, flags uint32) (ok bool, errno int) {
 	r0, _, e1 := Syscall6(procCryptAcquireContextW, uintptr(unsafe.Pointer(provhandle)), uintptr(unsafe.Pointer(container)), uintptr(unsafe.Pointer(provider)), uintptr(provtype), uintptr(flags), 0)
 	ok = bool(r0 != 0)

src/pkg/syscall/ztypes_windows_386.go

@@ -328,3 +328,11 @@ const (
 	S_IWUSR    = 0x80
 	S_IXUSR    = 0x40
 )
+
+const (
+	FILE_TYPE_CHAR    = 0x0002
+	FILE_TYPE_DISK    = 0x0001
+	FILE_TYPE_PIPE    = 0x0003
+	FILE_TYPE_REMOTE  = 0x8000
+	FILE_TYPE_UNKNOWN = 0x0000
+)