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dmesg.go (867B)

      1 // Copyright 2020 The Libc Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 //go:build libc.dmesg
      6 // +build libc.dmesg
      7 
      8 package libc // import "modernc.org/libc"
      9 
     10 import (
     11 	"fmt"
     12 	"os"
     13 	"path/filepath"
     14 	"strings"
     15 	"time"
     16 )
     17 
     18 const dmesgs = true
     19 
     20 var (
     21 	pid  = fmt.Sprintf("[%v %v] ", os.Getpid(), filepath.Base(os.Args[0]))
     22 	logf *os.File
     23 )
     24 
     25 func init() {
     26 	var err error
     27 	if logf, err = os.OpenFile("/tmp/libc.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY|os.O_SYNC, 0644); err != nil {
     28 		panic(err.Error())
     29 	}
     30 
     31 	dmesg("%v", time.Now())
     32 }
     33 
     34 func dmesg(s string, args ...interface{}) {
     35 	if s == "" {
     36 		s = strings.Repeat("%v ", len(args))
     37 	}
     38 	s = fmt.Sprintf(pid+s, args...)
     39 	switch {
     40 	case len(s) != 0 && s[len(s)-1] == '\n':
     41 		fmt.Fprint(logf, s)
     42 	default:
     43 		fmt.Fprintln(logf, s)
     44 	}
     45 }