Add Pledge wrappers

pledge.go

@@ -0,0 +1,20 @@
+// +build openbsd
+
+package lynx
+
+import "golang.org/x/sys/unix"
+
+// Pledge is just a wrapper to unix.Pledge.
+func Pledge(promises, execpromises string) error {
+	return unix.Pledge(promises, execpromises)
+}
+
+// PledgePromises is just a wrapper to unix.PledgePromises.
+func PledgePromises(promises string) error {
+	return unix.PledgePromises(promises)
+}
+
+// PledgeExecpromises is just a wrapper to unix.PledgeExecpromises.
+func PledgeExecpromises(execpromises string) error {
+	return unix.PledgeExecpromises(execpromises)
+}

pledge_other.go

@@ -0,0 +1,21 @@
+// +build !openbsd
+
+package lynx
+
+// Pledge is just a wrapper to unix.Pledge. It returns nil on
+// unsupported systems.
+func Pledge(_, _ string) error {
+	return nil
+}
+
+// PledgePromises is just a wrapper to unix.PledgePromises. It returns
+// nil on unsupported systems.
+func PledgePromises(_ string) error {
+	return nil
+}
+
+// PledgeExecpromises is just a wrapper to unix.PledgeExecpromises. It
+// returns nil on unsupported systems.
+func PledgeExecpromises(_ string) error {
+	return nil
+}