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Source file src/syscall/mkpost.go

Documentation: syscall

  // 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 syscall API in an architecture specific manner.
  //
  // mkpost is run after cgo -godefs by mkall.sh.
  package main
  
  import (
  	"fmt"
  	"go/format"
  	"io/ioutil"
  	"log"
  	"os"
  	"regexp"
  	"strings"
  )
  
  func main() {
  	b, err := ioutil.ReadAll(os.Stdin)
  	if err != nil {
  		log.Fatal(err)
  	}
  	s := string(b)
  
  	goarch := os.Getenv("GOARCH")
  	goos := os.Getenv("GOOS")
  	if goarch == "s390x" && goos == "linux" {
  		// Export the types of PtraceRegs fields.
  		re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
  		s = re.ReplaceAllString(s, "Ptrace$1")
  
  		// Replace padding fields inserted by cgo with blank identifiers.
  		re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
  		s = re.ReplaceAllString(s, "_")
  
  		// We want to keep X__val in Fsid. Hide it and restore it later.
  		s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
  
  		// Replace other unwanted fields with blank identifiers.
  		re = regexp.MustCompile("X_[A-Za-z0-9_]*")
  		s = re.ReplaceAllString(s, "_")
  
  		// Restore X__val in Fsid.
  		s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
  
  		// Force the type of RawSockaddr.Data to [14]int8 to match
  		// the existing gccgo API.
  		re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
  		s = re.ReplaceAllString(s, "${1}int8")
  	}
  
  	// gofmt
  	b, err = format.Source([]byte(s))
  	if err != nil {
  		log.Fatal(err)
  	}
  
  	// Append this command to the header to show where the new file
  	// came from.
  	re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
  	s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
  
  	fmt.Print(s)
  }
  

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