os: add support for openbsd

R=rsc
CC=golang-dev
https://golang.org/cl/4798061

src/pkg/os/Makefile

@@ -53,6 +53,18 @@ GOFILES_linux=\
 	exec_unix.go\
 	signal_unix.go\
 
+GOFILES_openbsd=\
+	dir_unix.go\
+	error_posix.go\
+	env_unix.go\
+	file_posix.go\
+	file_unix.go\
+	path_unix.go\
+	sys_bsd.go\
+	exec_posix.go\
+	exec_unix.go\
+	signal_unix.go\
+
 GOFILES_windows=\
 	dir_windows.go\
 	error_posix.go\

src/pkg/os/stat_openbsd.go

@@ -0,0 +1,32 @@
+// 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 "syscall"
+
+func isSymlink(stat *syscall.Stat_t) bool {
+	return stat.Mode&syscall.S_IFMT == syscall.S_IFLNK
+}
+
+func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *FileInfo {
+	fi.Dev = uint64(stat.Dev)
+	fi.Ino = uint64(stat.Ino)
+	fi.Nlink = uint64(stat.Nlink)
+	fi.Mode = uint32(stat.Mode)
+	fi.Uid = int(stat.Uid)
+	fi.Gid = int(stat.Gid)
+	fi.Rdev = uint64(stat.Rdev)
+	fi.Size = int64(stat.Size)
+	fi.Blksize = int64(stat.Blksize)
+	fi.Blocks = stat.Blocks
+	fi.Atime_ns = syscall.TimespecToNsec(stat.Atim)
+	fi.Mtime_ns = syscall.TimespecToNsec(stat.Mtim)
+	fi.Ctime_ns = syscall.TimespecToNsec(stat.Ctim)
+	fi.Name = basename(name)
+	if isSymlink(lstat) && !isSymlink(stat) {
+		fi.FollowedSymlink = true
+	}
+	return fi
+}