os: add AIX operating system

This commit adds AIX operating system to os package for ppc64
architecture.

Updates: #25893

Change-Id: Ieb9a2b3ac5b9abd3b5ab68eb732c17b6256d624d
Reviewed-on: https://go-review.googlesource.com/c/138725
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

28 files changed, 104 insertions, 27 deletions

diff --git a/src/os/dir_unix.go b/src/os/dir_unix.go
index 79d61c783f..7a3ef47ce2 100644
--- a/src/os/dir_unix.go
+++ b/src/os/dir_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/env_unix_test.go b/src/os/env_unix_test.go
index f7b67ebbb8..89430b3e20 100644
--- a/src/os/env_unix_test.go
+++ b/src/os/env_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package os_test
 
diff --git a/src/os/error_posix.go b/src/os/error_posix.go
index 3c81b41706..0478ba676a 100644
--- a/src/os/error_posix.go
+++ b/src/os/error_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package os
 
diff --git a/src/os/error_unix.go b/src/os/error_unix.go
index a9d798b391..bb6bbcc1e6 100644
--- a/src/os/error_unix.go
+++ b/src/os/error_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/error_unix_test.go b/src/os/error_unix_test.go
index 8db98676d1..c47af56332 100644
--- a/src/os/error_unix_test.go
+++ b/src/os/error_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os_test
 
diff --git a/src/os/exec/exec_posix_test.go b/src/os/exec/exec_posix_test.go
index 865b6c3ced..46799cdbdb 100644
--- a/src/os/exec/exec_posix_test.go
+++ b/src/os/exec/exec_posix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package exec_test
 
diff --git a/src/os/exec/lp_unix.go b/src/os/exec/lp_unix.go
index e098ff8e1d..799e0b4eeb 100644
--- a/src/os/exec/lp_unix.go
+++ b/src/os/exec/lp_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
 
 package exec
 
diff --git a/src/os/exec/lp_unix_test.go b/src/os/exec/lp_unix_test.go
index d467acf5db..e4656cafb8 100644
--- a/src/os/exec/lp_unix_test.go
+++ b/src/os/exec/lp_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package exec
 
diff --git a/src/os/exec_posix.go b/src/os/exec_posix.go
index e837e1c4d9..1e60365dba 100644
--- a/src/os/exec_posix.go
+++ b/src/os/exec_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package os
 
diff --git a/src/os/exec_unix.go b/src/os/exec_unix.go
index b07543e550..abae5a2feb 100644
--- a/src/os/exec_unix.go
+++ b/src/os/exec_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/executable_path.go b/src/os/executable_path.go
index 057e6a72f4..7b8b83652c 100644
--- a/src/os/executable_path.go
+++ b/src/os/executable_path.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build openbsd
+// +build aix openbsd
 
 package os
 
diff --git a/src/os/file_posix.go b/src/os/file_posix.go
index 7cfafc8fde..544d0ad55d 100644
--- a/src/os/file_posix.go
+++ b/src/os/file_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package os
 
diff --git a/src/os/file_unix.go b/src/os/file_unix.go
index cb90b70735..0ca34b070d 100644
--- a/src/os/file_unix.go
+++ b/src/os/file_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/os_unix_test.go b/src/os/os_unix_test.go
index 1077d78613..0317f7257e 100644
--- a/src/os/os_unix_test.go
+++ b/src/os/os_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package os_test
 
diff --git a/src/os/path_unix.go b/src/os/path_unix.go
index b2e0bca0df..3cb0e3acc4 100644
--- a/src/os/path_unix.go
+++ b/src/os/path_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/pipe_bsd.go b/src/os/pipe_bsd.go
index 9735988f32..dc4c951a28 100644
--- a/src/os/pipe_bsd.go
+++ b/src/os/pipe_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly js,wasm nacl solaris
+// +build aix darwin dragonfly js,wasm nacl solaris
 
 package os
 
diff --git a/src/os/signal/internal/pty/pty.go b/src/os/signal/internal/pty/pty.go
index c4c1567fce..c1c7fcffc5 100644
--- a/src/os/signal/internal/pty/pty.go
+++ b/src/os/signal/internal/pty/pty.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux,!android netbsd openbsd
+// +build aix darwin dragonfly freebsd linux,!android netbsd openbsd
 // +build cgo
 
 // Package pty is a simple pseudo-terminal package for Unix systems,
diff --git a/src/os/signal/signal_test.go b/src/os/signal/signal_test.go
index 3d79c7a861..ecb05fd16c 100644
--- a/src/os/signal/signal_test.go
+++ b/src/os/signal/signal_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package signal
 
diff --git a/src/os/signal/signal_unix.go b/src/os/signal/signal_unix.go
index 28fbb54995..7fa634f15a 100644
--- a/src/os/signal/signal_unix.go
+++ b/src/os/signal/signal_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package signal
 
diff --git a/src/os/stat_aix.go b/src/os/stat_aix.go
new file mode 100644
index 0000000000..a37c9fdae4
--- /dev/null
+++ b/src/os/stat_aix.go
@@ -0,0 +1,51 @@
+// Copyright 2018 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 (
+	"syscall"
+	"time"
+)
+
+func fillFileStatFromSys(fs *fileStat, name string) {
+	fs.name = basename(name)
+	fs.size = int64(fs.sys.Size)
+	fs.modTime = stTimespecToTime(fs.sys.Mtim)
+	fs.mode = FileMode(fs.sys.Mode & 0777)
+	switch fs.sys.Mode & syscall.S_IFMT {
+	case syscall.S_IFBLK:
+		fs.mode |= ModeDevice
+	case syscall.S_IFCHR:
+		fs.mode |= ModeDevice | ModeCharDevice
+	case syscall.S_IFDIR:
+		fs.mode |= ModeDir
+	case syscall.S_IFIFO:
+		fs.mode |= ModeNamedPipe
+	case syscall.S_IFLNK:
+		fs.mode |= ModeSymlink
+	case syscall.S_IFREG:
+		// nothing to do
+	case syscall.S_IFSOCK:
+		fs.mode |= ModeSocket
+	}
+	if fs.sys.Mode&syscall.S_ISGID != 0 {
+		fs.mode |= ModeSetgid
+	}
+	if fs.sys.Mode&syscall.S_ISUID != 0 {
+		fs.mode |= ModeSetuid
+	}
+	if fs.sys.Mode&syscall.S_ISVTX != 0 {
+		fs.mode |= ModeSticky
+	}
+}
+
+func stTimespecToTime(ts syscall.StTimespec_t) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
+
+// For testing.
+func atime(fi FileInfo) time.Time {
+	return stTimespecToTime(fi.Sys().(*syscall.Stat_t).Atim)
+}
diff --git a/src/os/stat_unix.go b/src/os/stat_unix.go
index 856b49929f..4f85dcea07 100644
--- a/src/os/stat_unix.go
+++ b/src/os/stat_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/sys_aix.go b/src/os/sys_aix.go
new file mode 100644
index 0000000000..53a40f2677
--- /dev/null
+++ b/src/os/sys_aix.go
@@ -0,0 +1,26 @@
+// Copyright 2018 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 "syscall"
+
+// gethostname syscall cannot be used because it also returns the domain.
+// Therefore, hostname is retrieve with uname syscall and the Nodename field.
+
+func hostname() (name string, err error) {
+	var u syscall.Utsname
+	if errno := syscall.Uname(&u); errno != nil {
+		return "", NewSyscallError("uname", errno)
+	}
+	b := make([]byte, len(u.Nodename))
+	i := 0
+	for ; i < len(u.Nodename); i++ {
+		if u.Nodename[i] == 0 {
+			break
+		}
+		b[i] = byte(u.Nodename[i])
+	}
+	return string(b[:i]), nil
+}
diff --git a/src/os/sys_unix.go b/src/os/sys_unix.go
index 3c63c10409..8491bad242 100644
--- a/src/os/sys_unix.go
+++ b/src/os/sys_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package os
 
diff --git a/src/os/user/cgo_lookup_unix.go b/src/os/user/cgo_lookup_unix.go
index ccb2278246..856ed28de8 100644
--- a/src/os/user/cgo_lookup_unix.go
+++ b/src/os/user/cgo_lookup_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd !android,linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd !android,linux netbsd openbsd solaris
 // +build cgo,!osusergo
 
 package user
diff --git a/src/os/user/lookup_stubs.go b/src/os/user/lookup_stubs.go
index 9fc03c65d9..61bf1dc7a6 100644
--- a/src/os/user/lookup_stubs.go
+++ b/src/os/user/lookup_stubs.go
@@ -65,8 +65,8 @@ func current() (*User, error) {
 }
 
 func listGroups(*User) ([]string, error) {
-	if runtime.GOOS == "android" {
-		return nil, errors.New("user: GroupIds not implemented on Android")
+	if runtime.GOOS == "android" || runtime.GOOS == "aix" {
+		return nil, errors.New(fmt.Sprintf("user: GroupIds not implemented on %s", runtime.GOOS))
 	}
 	return nil, errors.New("user: GroupIds requires cgo")
 }
diff --git a/src/os/user/lookup_unix.go b/src/os/user/lookup_unix.go
index c4e9ba1e81..be62f4d0c3 100644
--- a/src/os/user/lookup_unix.go
+++ b/src/os/user/lookup_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm !android,linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm !android,linux nacl netbsd openbsd solaris
 // +build !cgo osusergo
 
 package user
diff --git a/src/os/user/lookup_unix_test.go b/src/os/user/lookup_unix_test.go
index 02c88ab875..65fe0656de 100644
--- a/src/os/user/lookup_unix_test.go
+++ b/src/os/user/lookup_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd !android,linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd !android,linux nacl netbsd openbsd solaris
 // +build !cgo
 
 package user
diff --git a/src/os/wait_unimp.go b/src/os/wait_unimp.go
index 3d8210f5bd..d070604600 100644
--- a/src/os/wait_unimp.go
+++ b/src/os/wait_unimp.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly js,wasm nacl netbsd openbsd solaris
+// +build aix darwin dragonfly js,wasm nacl netbsd openbsd solaris
 
 package os