vendor: adding in golang.org/x/sys/unix package

This commit adds in the golang.org/x/sys/unix package. This package
provides a low-level interface to unix syscalls. We will uses this
package instead of the built-in "syscall" package because the syscall
package is locked down (https://golang.org/pkg/syscall) and is not
exposing any new kernel functionality.

In fact, this is actually a patched version of the x/sys/unix package
pending review (first part: https://go-review.googlesource.com/c/37943).
The version included in this commit exposes all of the filesystem
encryption kernel interfaces to Go code.

Change-Id: Ic5f9c98b858ccb00db97502c9a60e9249aa8ba38

1 files changed, 39 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/unix/mksysnum_darwin.pl b/vendor/golang.org/x/sys/unix/mksysnum_darwin.pl
new file mode 100755
index 0000000..5453c53
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/mksysnum_darwin.pl
@@ -0,0 +1,39 @@
+#!/usr/bin/env perl
+# 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.
+#
+# Generate system call table for Darwin from sys/syscall.h
+
+use strict;
+
+if($ENV{'GOARCH'} eq "" || $ENV{'GOOS'} eq "") {
+	print STDERR "GOARCH or GOOS not defined in environment\n";
+	exit 1;
+}
+
+my $command = "mksysnum_darwin.pl " . join(' ', @ARGV);
+
+print <<EOF;
+// $command
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
+// +build $ENV{'GOARCH'},$ENV{'GOOS'}
+
+package unix
+
+const (
+EOF
+
+while(<>){
+	if(/^#define\s+SYS_(\w+)\s+([0-9]+)/){
+		my $name = $1;
+		my $num = $2;
+		$name =~ y/a-z/A-Z/;
+		print "	SYS_$name = $num;"
+	}
+}
+
+print <<EOF;
+)
+EOF