vendor/golang.org/x/sys/unix/mkpost.go

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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build ignore

// mkpost processes the output of cgo -godefs to
// modify the generated types. It is used to clean up
// the sys API in an architecture specific manner.
//
// mkpost is run after cgo -godefs; see README.md.
package main

import (
	"bytes"
	"fmt"
	"go/format"
	"io/ioutil"
	"log"
	"os"
	"regexp"
)

func main() {
	// Get the OS and architecture (using GOARCH_TARGET if it exists)
	goos := os.Getenv("GOOS")
	goarch := os.Getenv("GOARCH_TARGET")
	if goarch == "" {
		goarch = os.Getenv("GOARCH")
	}
	// Check that we are using the Docker-based build system if we should be.
	if goos == "linux" {
		if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
			os.Stderr.WriteString("In the Docker-based build system, mkpost should not be called directly.\n")
			os.Stderr.WriteString("See README.md\n")
			os.Exit(1)
		}
	}

	b, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		log.Fatal(err)
	}

	if goos == "aix" {
		// Replace type of Atim, Mtim and Ctim by Timespec in Stat_t
		// to avoid having both StTimespec and Timespec.
		sttimespec := regexp.MustCompile(`_Ctype_struct_st_timespec`)
		b = sttimespec.ReplaceAll(b, []byte("Timespec"))
	}

	// Intentionally export __val fields in Fsid and Sigset_t
	valRegex := regexp.MustCompile(`type (Fsid|Sigset_t) struct {(\s+)X__(bits|val)(\s+\S+\s+)}`)
	b = valRegex.ReplaceAll(b, []byte("type $1 struct {${2}Val$4}"))

	// Intentionally export __fds_bits field in FdSet
	fdSetRegex := regexp.MustCompile(`type (FdSet) struct {(\s+)X__fds_bits(\s+\S+\s+)}`)
	b = fdSetRegex.ReplaceAll(b, []byte("type $1 struct {${2}Bits$3}"))

	// If we have empty Ptrace structs, we should delete them. Only s390x emits