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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
commit73df946d56c74384511a194dd01dbe099584fd1a (patch)
treefd0bcea490dd81327ddfbb31e215439672c9a068 /src/os/sys_linux.go
parentInitial commit. (diff)
downloadgolang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.tar.xz
golang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.zip
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/os/sys_linux.go')
-rw-r--r--src/os/sys_linux.go53
1 files changed, 53 insertions, 0 deletions
diff --git a/src/os/sys_linux.go b/src/os/sys_linux.go
new file mode 100644
index 0000000..36a8a24
--- /dev/null
+++ b/src/os/sys_linux.go
@@ -0,0 +1,53 @@
+// Copyright 2009 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.
+
+package os
+
+import (
+ "runtime"
+ "syscall"
+)
+
+func hostname() (name string, err error) {
+ // Try uname first, as it's only one system call and reading
+ // from /proc is not allowed on Android.
+ var un syscall.Utsname
+ err = syscall.Uname(&un)
+
+ var buf [512]byte // Enough for a DNS name.
+ for i, b := range un.Nodename[:] {
+ buf[i] = uint8(b)
+ if b == 0 {
+ name = string(buf[:i])
+ break
+ }
+ }
+ // If we got a name and it's not potentially truncated
+ // (Nodename is 65 bytes), return it.
+ if err == nil && len(name) > 0 && len(name) < 64 {
+ return name, nil
+ }
+ if runtime.GOOS == "android" {
+ if name != "" {
+ return name, nil
+ }
+ return "localhost", nil
+ }
+
+ f, err := Open("/proc/sys/kernel/hostname")
+ if err != nil {
+ return "", err
+ }
+ defer f.Close()
+
+ n, err := f.Read(buf[:])
+ if err != nil {
+ return "", err
+ }
+
+ if n > 0 && buf[n-1] == '\n' {
+ n--
+ }
+ return string(buf[:n]), nil
+}