7a9389330e
gcc/: * gcc.c (default_compilers): Add entry for ".go". * common.opt: Add -static-libgo as a driver option. * doc/install.texi (Configuration): Mention libgo as an option for --enable-shared. Mention go as an option for --enable-languages. * doc/invoke.texi (Overall Options): Mention .go as a file name suffix. Mention go as a -x option. * doc/frontends.texi (G++ and GCC): Mention Go as a supported language. * doc/sourcebuild.texi (Top Level): Mention libgo. * doc/standards.texi (Standards): Add section on Go language. Move references for other languages into their own section. * doc/contrib.texi (Contributors): Mention that I contributed the Go frontend. gcc/testsuite/: * lib/go.exp: New file. * lib/go-dg.exp: New file. * lib/go-torture.exp: New file. * lib/target-supports.exp (check_compile): Match // Go. From-SVN: r167407
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Read static host/IP entries from /etc/hosts.
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package net
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import (
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"os"
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"sync"
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)
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const cacheMaxAge = int64(300) // 5 minutes.
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// hostsPath points to the file with static IP/address entries.
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var hostsPath = "/etc/hosts"
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// Simple cache.
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var hosts struct {
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sync.Mutex
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data map[string][]string
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time int64
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path string
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}
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func readHosts() {
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now, _, _ := os.Time()
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hp := hostsPath
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if len(hosts.data) == 0 || hosts.time+cacheMaxAge <= now || hosts.path != hp {
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hs := make(map[string][]string)
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var file *file
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if file, _ = open(hp); file == nil {
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return
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}
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for line, ok := file.readLine(); ok; line, ok = file.readLine() {
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if i := byteIndex(line, '#'); i >= 0 {
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// Discard comments.
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line = line[0:i]
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}
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f := getFields(line)
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if len(f) < 2 || ParseIP(f[0]) == nil {
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continue
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}
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for i := 1; i < len(f); i++ {
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h := f[i]
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hs[h] = append(hs[h], f[0])
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}
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}
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// Update the data cache.
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hosts.time, _, _ = os.Time()
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hosts.path = hp
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hosts.data = hs
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file.close()
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}
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}
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// lookupStaticHosts looks up the addresses for the given host from /etc/hosts.
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func lookupStaticHost(host string) []string {
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hosts.Lock()
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defer hosts.Unlock()
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readHosts()
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if len(hosts.data) != 0 {
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if ips, ok := hosts.data[host]; ok {
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return ips
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}
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}
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return nil
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}
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