mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
// Copyright 2024 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build network_plugins
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// +build network_plugins
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package cgo
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/*
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#include <stdlib.h>
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// stack initialization operations
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int plugin_initstack(char *init_str, int *fds, int num);
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int plugin_preinitstack(int pid, char **init_str_ptr, int **fds, int *num);
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*/
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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// InitStack implements CGO wrapper for plugin_initstack.
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func InitStack(initStr string, fds []int) error {
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cs := C.CString(initStr)
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defer C.free(unsafe.Pointer(cs))
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fdNum := len(fds)
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cfds := make([]C.int, fdNum)
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for i := 0; i < fdNum; i++ {
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cfds[i] = (C.int)(fds[i])
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}
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if ret := C.plugin_initstack(cs, (*C.int)(&cfds[0]), (C.int)(fdNum)); ret != 0 {
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return fmt.Errorf("failed to init stack, ret = %v", ret)
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}
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return nil
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}
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// PreInitStack implements CGO wrapper for plugin_preinitstack.
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func PreInitStack(pid int) (string, []int, error) {
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var (
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cInitStr *C.char
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cFdArray *C.int
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num C.int
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)
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if ret := C.plugin_preinitstack(
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C.int(pid),
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(**C.char)(unsafe.Pointer(&cInitStr)),
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(**C.int)(unsafe.Pointer(&cFdArray)),
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(*C.int)(unsafe.Pointer(&num))); ret != 0 {
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return "", nil, fmt.Errorf("failed to prepare init args for the stack, ret = %v", ret)
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}
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defer func() {
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C.free(unsafe.Pointer(cInitStr))
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C.free(unsafe.Pointer(cFdArray))
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}()
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initStr := C.GoString(cInitStr)
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fds := make([]int, int(num))
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cFds := unsafe.Slice(cFdArray, num)
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for i := 0; i < int(num); i++ {
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fds[i] = int(cFds[i])
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}
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return initStr, fds, nil
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}
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