Fix build for openbsd

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

cmd/prometheus/limits_default.go

@@ -46,8 +46,3 @@ func getLimits(resource int, unit string) string {
 func FdLimits() string {
 	return getLimits(syscall.RLIMIT_NOFILE, "")
 }
-
-// VmLimits returns the soft and hard limits for virtual memory.
-func VmLimits() string {
-	return getLimits(syscall.RLIMIT_AS, "b")
-}

cmd/prometheus/vmlimits_default.go

@@ -0,0 +1,26 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !windows
+// +build !openbsd
+
+package main
+
+import (
+	"syscall"
+)
+
+// VmLimits returns the soft and hard limits for virtual memory.
+func VmLimits() string {
+	return getLimits(syscall.RLIMIT_AS, "b")
+}

cmd/prometheus/vmlimits_openbsd.go

@@ -0,0 +1,25 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build openbsd
+
+package main
+
+import (
+	"syscall"
+)
+
+// VmLimits returns the soft and hard limits for virtual memory.
+func VmLimits() string {
+	return getLimits(syscall.RLIMIT_DATA, "b")
+}