[インデックス 13950] ファイルの概要
このコミットは、Go言語のWindows向けsyscall
パッケージにおける、ネットワーク関連のシステムコール(Winsock API)の結果判定方法の修正に関するものです。具体的には、システムコールからの戻り値(uintptr
型)をint
型にキャストして-1
と比較していた箇所を、uintptr
型として直接比較するように変更し、型安全性を向上させています。これにより、特に64ビット環境での潜在的なバグが修正されました。
コミット
commit 0e6f927108dc785812b6e5ce94cea2ff4ca395cc
Author: Alex Brainman <alex.brainman@gmail.com>
Date: Tue Sep 25 17:06:39 2012 +1000
syscall: do not use int to test network syscall results (on windows)
Fixes #4147.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6569050
GitHub上でのコミットページへのリンク
https://github.com/golang/go/commit/0e6f927108dc785812b6e5ce94cea2ff4ca395cc
元コミット内容
syscall: do not use int to test network syscall results (on windows)
Fixes #4147.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6569050
変更の背景
Go言語のsyscall
パッケージは、オペレーティングシステム固有のAPIを呼び出すための低レベルなインターフェースを提供します。Windows環境において、多くのWinAPI関数、特にWinsock(Windows Sockets)関連の関数は、成功時には0以外の値や特定のハンドルを返し、失敗時には-1
やINVALID_HANDLE_VALUE
といった特殊な値を返します。
このコミット以前のGoのsyscall
パッケージでは、これらのWinAPI関数の戻り値(Goではuintptr
型で受け取る)をエラーチェックする際に、明示的にint
型にキャストしてから-1
と比較している箇所がありました。
if int(r1) == -1 { ... }
このint(r1)
というキャストが問題を引き起こす可能性がありました。uintptr
は符号なし整数型であり、ポインタのアドレスを保持できる十分な大きさを持つ型です。一方、int
は符号付き整数型であり、そのサイズはシステム(32ビットまたは64ビット)によって異なります。
特に、WinAPI関数が返すエラー値-1
は、32ビットの符号なし整数としては0xFFFFFFFF
として表現されます。これをuintptr
として受け取った場合、32ビットシステムでは0xFFFFFFFF
、64ビットシステムでは0xFFFFFFFFFFFFFFFF
となります。このuintptr
の値をint
にキャストすると、システムによっては予期せぬ結果となる可能性がありました。例えば、64ビットシステムでuintptr(0xFFFFFFFFFFFFFFFF)
を32ビットのint
にキャストすると、値が切り捨てられて0xFFFFFFFF
となり、これが符号付き整数として-1
と解釈されるため、一見問題ないように見えます。しかし、これは型変換の暗黙的な挙動に依存しており、コードの意図が不明瞭になるだけでなく、将来的なアーキテクチャ変更やコンパイラの最適化によって予期せぬバグにつながるリスクがありました。
この問題はGoのIssue #4147として報告されており、特にネットワーク関連のシステムコールで顕著でした。Winsock APIでは、SOCKET_ERROR
という定数が-1
として定義されており、多くの関数が失敗時にこの値を返します。このコミットは、このような型変換の危険性を排除し、より堅牢で移植性の高いエラーチェックメカニズムを導入することを目的としています。
前提知識の解説
Go言語の syscall
パッケージ
syscall
パッケージは、Goプログラムからオペレーティングシステムが提供する低レベルなシステムコールを直接呼び出すための機能を提供します。これにより、ファイル操作、プロセス管理、ネットワーク通信など、OS固有の機能にアクセスできます。このパッケージは、OSのAPIとGoの間のブリッジとして機能し、Goの標準ライブラリの多くの部分で内部的に利用されています。
Windows API (WinAPI)
Windows APIは、Microsoft Windowsオペレーティングシステムが提供するコア機能へのプログラミングインターフェースの集合です。C言語で記述されており、関数呼び出しを通じてOSの機能を利用します。WinAPI関数は、成功時には0以外の値や特定のハンドルを返し、失敗時には0や-1
、あるいはINVALID_HANDLE_VALUE
のような特殊な値を返すことが一般的です。エラーの詳細はGetLastError()
関数で取得できます。
uintptr
型
Go言語のuintptr
型は、ポインタを保持できるだけの大きさを持つ符号なし整数型です。これは、Goのガベージコレクタが管理するメモリ領域外の、OSが管理するメモリやハンドルを扱う際に特に有用です。uintptr
は、ポインタと整数を相互に変換する際に使用されますが、それ自体はポインタではなく、算術演算が可能です。
符号付き整数と符号なし整数
コンピュータにおける整数型には、符号付き(signed)と符号なし(unsigned)があります。
- 符号付き整数: 正の値と負の値を表現できます。最上位ビットが符号ビットとして使われます(0なら正、1なら負)。負の数は通常、2の補数表現で格納されます。例えば、32ビット符号付き整数で
-1
は0xFFFFFFFF
として表現されます。 - 符号なし整数: 負の値を表現できず、0以上の値のみを表現します。全てのビットが数値の大きさを表すために使われます。例えば、32ビット符号なし整数で
0xFFFFFFFF
は最大値(約42億)を表します。
これらの型間でキャストを行うと、ビットパターンは同じでも解釈が異なるため、予期せぬ値になることがあります。特に、符号なしの大きな値を符号付きにキャストすると、負の値として解釈されることがあります。
Winsock (Windows Sockets)
Winsockは、Windows上でネットワークアプリケーションを開発するためのAPIです。TCP/IPなどの標準的なネットワークプロトコルを介した通信機能を提供します。Winsock API関数は、成功時には0を返し、失敗時にはSOCKET_ERROR
(値は-1
)を返すことが一般的です。エラーの詳細はWSAGetLastError()
関数で取得します。
mksyscall_windows.pl
スクリプト
Go言語のsyscall
パッケージには、OS固有のシステムコールをGoの関数としてラップするためのコード生成スクリプトが含まれています。mksyscall_windows.pl
は、Windows APIの定義からGoのsyscall
関数を自動生成するPerlスクリプトです。このスクリプトは、WinAPI関数の戻り値やエラー条件をGoのコードに適切にマッピングする役割を担っています。
技術的詳細
このコミットの核心は、Goのsyscall
パッケージがWindows APIの戻り値を扱う際の型安全性の向上です。
-
uintptr
とint
の比較問題: WinAPI関数は、成功/失敗を示すために様々な値を返します。特に、失敗を示す値として-1
がよく使われます。Goのsyscall
パッケージでは、これらの戻り値はuintptr
型として受け取られます。 従来のコードでは、if int(r1) == -1
のように、uintptr
型のr1
をint
にキャストしてから-1
と比較していました。- 32ビットシステムでは、
uintptr
もint
も32ビット幅です。uintptr(0xFFFFFFFF)
はint(-1)
にキャストされます。 - 64ビットシステムでは、
uintptr
は64ビット幅ですが、int
は通常32ビット幅です。uintptr(0xFFFFFFFFFFFFFFFF)
(64ビットの-1
)をint
にキャストすると、上位32ビットが切り捨てられ、結果としてint(0xFFFFFFFF)
、つまりint(-1)
となります。 一見するとどちらのケースでも-1
になるため問題ないように見えますが、これはGoの型システムが意図する厳密な型チェックを迂回するものであり、潜在的なバグや将来的な互換性の問題を引き起こす可能性があります。特に、uintptr
が保持する値が-1
以外の大きな値であった場合、int
へのキャストによって値が変化し、誤ったエラー判定につながる恐れがありました。
- 32ビットシステムでは、
-
socket_error
定数の導入: Winsock APIの関数は、失敗時にSOCKET_ERROR
という定数を返します。この定数の値は-1
です。このコミットでは、このSOCKET_ERROR
をuintptr
型で正確に表現するために、const socket_error = uintptr(^uint32(0))
という定数を導入しました。^uint32(0)
は、32ビットの符号なし整数0
のビット反転です。これは0xFFFFFFFF
となります。- これを
uintptr
にキャストすることで、socket_error
はシステムアーキテクチャに関わらず、uintptr
型で0xFFFFFFFF
という値を持つことになります。 これにより、ネットワーク関連のシステムコールが返すuintptr
型の戻り値r1
を、r1 == socket_error
という形で直接比較できるようになり、int
へのキャストが不要になりました。これは、uintptr
が符号なしであるという性質を考慮した、より正確で型安全な比較方法です。
-
mksyscall_windows.pl
の修正:mksyscall_windows.pl
スクリプトは、WinAPIの定義からGoのsyscall
関数を生成する際に、戻り値のチェックロジックを生成します。このスクリプトが生成するコードからint()
キャストを削除することで、自動生成される全てのsyscall
ラッパー関数が、uintptr
型の戻り値を直接比較するようになります。これにより、手動で記述されたコードと自動生成されたコードの間で一貫性が保たれ、将来的な同様の問題の発生を防ぎます。
これらの変更により、GoのWindows向けsyscall
パッケージは、WinAPIの戻り値の処理において、より堅牢で正確なエラーハンドリングを実現しました。
コアとなるコードの変更箇所
このコミットによる主要なコード変更は以下のファイルに集中しています。
-
src/pkg/syscall/mksyscall_windows.pl
:$failexpr = "int(r1) $failcond";
↓$failexpr = "r1 $failcond";
この変更は、システムコールラッパーを生成するPerlスクリプトにおいて、戻り値r1
をint
にキャストする処理を削除しています。これにより、生成されるGoコードがuintptr
を直接比較するようになります。
-
src/pkg/syscall/syscall_windows.go
:const socket_error = uintptr(^uint32(0))
の追加。- ネットワーク関連のシステムコール定義(
//sys
ディレクティブ)において、[failretval==-1]
が[failretval==socket_error]
に変更されています。 例:-sys WSACleanup() (err error) [failretval==-1] = ws2_32.WSACleanup
+sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
これは、Winsock APIのエラーを示す-1
を、uintptr
型で正しく表現するsocket_error
定数に置き換え、システムコール定義でその定数を使用するように変更しています。
-
src/pkg/syscall/zsyscall_windows_386.go
およびsrc/pkg/syscall/zsyscall_windows_amd64.go
: これらのファイルはmksyscall_windows.pl
によって自動生成されるファイルであり、多くのシステムコールラッパー関数が含まれています。if int(r1) == 0 { ... }
がif r1 == 0 { ... }
に変更。if int(r1) == -1 { ... }
がif r1 == socket_error { ... }
に変更(ネットワーク関連関数)。 これらの変更は、r1
(uintptr
型)をint
にキャストする処理を削除し、直接uintptr
型として比較するように修正しています。特にネットワーク関連の関数では、新しく定義されたsocket_error
定数との比較に置き換えられています。
コアとなるコードの解説
src/pkg/syscall/mksyscall_windows.pl
の変更
--- a/src/pkg/syscall/mksyscall_windows.pl
+++ b/src/pkg/syscall/mksyscall_windows.pl
@@ -266,7 +266,7 @@ while(<>) {
$failexpr = "!$name";
} elsif($name eq "err") {
$ret[$i] = "r1";
- $failexpr = "int(r1) $failcond";
+ $failexpr = "r1 $failcond";
} else {
$failexpr = "$name $failcond";
}
このPerlスクリプトは、Goのsyscall
パッケージのWindows固有の関数を生成する際に使用されます。変更前は、システムコールからの戻り値r1
をint
にキャストしてからエラー条件($failcond
)と比較するコードを生成していました。この変更により、int()
キャストが削除され、生成されるGoコードがr1
(uintptr
型)を直接比較するようになります。これは、Goの型システムに沿った、より正確な比較を保証するための基盤となる変更です。
src/pkg/syscall/syscall_windows.go
の変更
--- a/src/pkg/syscall/syscall_windows.go
+++ b/src/pkg/syscall/syscall_windows.go
@@ -468,25 +468,27 @@ func Chmod(path string, mode uint32) (err error) {
// net api calls
+const socket_error = uintptr(^uint32(0))
+
//sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup
-//sys WSACleanup() (err error) [failretval==-1] = ws2_32.WSACleanup
-//sys WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==-1] = ws2_32.WSAIoctl
+//sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
+//sys WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==socket_error] = ws2_32.WSAIoctl
//sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket
-//sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==-1] = ws2_32.setsockopt
-//sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==-1] = ws2_32.getsockopt
-//sys bind(s Handle, name uintptr, namelen int32) (err error) [failretval==-1] = ws2_32.bind
-//sys connect(s Handle, name uintptr, namelen int32) (err error) [failretval==-1] = ws2_32.connect
-//sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==-1] = ws2_32.getsockname
-//sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==-1] = ws2_32.getpeername
-//sys listen(s Handle, backlog int32) (err error) [failretval==-1] = ws2_32.listen
-//sys shutdown(s Handle, how int32) (err error) [failretval==-1] = ws2_32.shutdown
-//sys Closesocket(s Handle) (err error) [failretval==-1] = ws2_32.closesocket
+//sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt
+//sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt
+//sys bind(s Handle, name uintptr, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind
+//sys connect(s Handle, name uintptr, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect
+//sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname
+//sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername
+//sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen
+//sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown
+//sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
//sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
//sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs
-//sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==-1] = ws2_32.WSARecv
-//sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==-1] = ws2_32.WSASend
-//sys WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==-1] = ws2_32.WSARecvFrom
-//sys WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==-1] = ws2_32.WSASendTo
+//sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv
+//sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend
+//sys WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecvFrom
+//sys WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASendTo
//sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname
//sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname
//sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
このファイルでは、まずsocket_error
という新しい定数が定義されています。uintptr(^uint32(0))
は、32ビットの符号なし整数0
のビットを反転させた値(0xFFFFFFFF
)をuintptr
型として表現します。これは、Winsock APIがエラー時に返す-1
(SOCKET_ERROR
)をuintptr
型で正確に表現するためのものです。
次に、//sys
ディレクティブで定義されている多くのネットワーク関連システムコール(WSACleanup
, WSAIoctl
, Setsockopt
など)のfailretval
(失敗時の戻り値)が、これまでの-1
から新しく定義されたsocket_error
に変更されています。これにより、これらの関数が返すuintptr
型の値がsocket_error
と一致するかどうかでエラーを判定するようになります。
src/pkg/syscall/zsyscall_windows_386.go
および src/pkg/syscall/zsyscall_windows_amd64.go
の変更
--- a/src/pkg/syscall/zsyscall_windows_386.go
+++ b/src/pkg/syscall/zsyscall_windows_386.go
@@ -176,7 +176,7 @@ func LoadLibrary(libname string) (handle Handle, err error) {
func FreeLibrary(handle Handle) (err error) {
r1, _, e1 := Syscall(procFreeLibrary.Addr(), 1, uintptr(handle), 0, 0)
- if int(r1) == 0 {
+ if r1 == 0 {
if e1 != 0 {
err = error(e1)
} else {
@@ -1233,7 +1233,7 @@ func WSAStartup(verreq uint32, data *WSAData) (sockerr error) {
func WSACleanup() (err error) {
r1, _, e1 := Syscall(procWSACleanup.Addr(), 0, 0, 0, 0)
- if int(r1) == -1 {
+ if r1 == socket_error {
if e1 != 0 {
err = error(e1)
} else {
これらのファイルは、mksyscall_windows.pl
スクリプトによって自動生成されるGoのソースコードです。変更前は、Syscall
関数の戻り値r1
(uintptr
型)をint
にキャストしてから0
や-1
と比較していました。
このコミットでは、int(r1) == 0
という形式がr1 == 0
に、そしてネットワーク関連の関数ではint(r1) == -1
という形式がr1 == socket_error
にそれぞれ変更されています。
これにより、uintptr
型のr1
が直接uintptr
型の0
やsocket_error
定数と比較されるようになります。これは、uintptr
が符号なし整数であることを考慮し、型変換による潜在的な問題を回避するための重要な修正です。特に、socket_error
定数を使用することで、Winsock APIのSOCKET_ERROR
という概念がGoのコード内で明確かつ型安全に扱われるようになります。
これらの変更は、GoのWindows向けsyscall
パッケージが、より正確で堅牢なエラーハンドリングを行うための基盤を確立するものです。
関連リンク
- Go Issue #4147: https://github.com/golang/go/issues/4147
- Go CL 6569050: https://golang.org/cl/6569050
参考にした情報源リンク
- Go's approach to handling Windows syscall errors: https://justen.codes/go-windows-syscall-error-handling-a7f212d2e2d
syscall.Errno
in Go: https://pkg.go.dev/syscall#ErrnoWSA_INVALID_HANDLE
error: https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2uintptr
in Go: https://pkg.go.dev/builtin#uintptr- Signed vs Unsigned Integers: General programming concept.
- Winsock
SOCKET_ERROR
: https://learn.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-wsagetlasterror (indirectly, asSOCKET_ERROR
is the return value for many Winsock functions on failure) - Go
x/sys/windows
package: https://pkg.go.dev/golang.org/x/sys/windows (modern alternative to built-insyscall
for Windows) - Stack Overflow discussions on Go Windows syscall errors:
- https://stackoverflow.com/questions/24072229/how-to-get-the-error-code-from-a-windows-syscall-in-go
- https://stackoverflow.com/questions/32900000/go-syscall-errno-vs-windows-error-codes
- https://stackoverflow.com/questions/24072229/how-to-get-the-error-code-from-a-windows-syscall-in-go
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