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46 lines
1.5 KiB
Go
46 lines
1.5 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// Package utils contains internal helper functions for go-ethereum commands.
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package utils
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import (
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"fmt"
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"io"
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"os"
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"runtime"
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)
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// Fatalf formats a message to standard error and exits the program.
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// The message is also printed to standard output if standard error
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// is redirected to a different file.
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func Fatalf(format string, args ...interface{}) {
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w := io.MultiWriter(os.Stdout, os.Stderr)
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if runtime.GOOS == "windows" {
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// The SameFile check below doesn't work on Windows.
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// stdout is unlikely to get redirected though, so just print there.
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w = os.Stdout
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} else {
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outf, _ := os.Stdout.Stat()
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errf, _ := os.Stderr.Stat()
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if outf != nil && errf != nil && os.SameFile(outf, errf) {
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w = os.Stderr
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}
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}
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fmt.Fprintf(w, "Fatal: "+format+"\n", args...)
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os.Exit(1)
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}
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