patch os, syscall, io/fs: Errno, Stdin/out/err

internal/lib/syscall/syscall_unix.go

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package syscall
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/internal/lib/errors"
+)
+
+var (
+	Stdin  = 0
+	Stdout = 1
+	Stderr = 2
+)
+
+type Errno uintptr
+
+func (e Errno) Error() string {
+	ret := c.Strerror(c.Int(e))
+	return unsafe.String((*byte)(unsafe.Pointer(ret)), c.Strlen(ret))
+}
+
+func (e Errno) Is(target error) bool {
+	switch target {
+	case ErrPermission:
+		return e == EACCES || e == EPERM
+	case ErrExist:
+		return e == EEXIST || e == ENOTEMPTY
+	case ErrNotExist:
+		return e == ENOENT
+	case errors.ErrUnsupported:
+		return e == ENOSYS || e == ENOTSUP || e == EOPNOTSUPP
+	}
+	return false
+}
+
+func (e Errno) Temporary() bool {
+	return e == EINTR || e == EMFILE || e == ENFILE || e.Timeout()
+}
+
+func (e Errno) Timeout() bool {
+	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
+}