remove openbsd amd64 cgo

collector/sysctl_openbsd_amd64.go

@@ -0,0 +1,74 @@
+// Copyright 2015 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.
+
+package collector
+
+import (
+	"golang.org/x/sys/unix"
+	"syscall"
+	"unsafe"
+)
+
+// unix._C_int
+type _C_int int32
+
+var _zero uintptr
+
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case unix.EAGAIN:
+		return syscall.EAGAIN
+	case unix.EINVAL:
+		return syscall.EINVAL
+	case unix.ENOENT:
+		return syscall.ENOENT
+	}
+	return e
+}
+
+func _sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
+	var _p0 unsafe.Pointer
+	if len(mib) > 0 {
+		_p0 = unsafe.Pointer(&mib[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	for {
+		_, _, e1 := unix.Syscall6(unix.SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
+		if e1 != 0 {
+			err = errnoErr(e1)
+		}
+		if err != unix.EINTR {
+			return
+		}
+	}
+	return
+}
+
+func sysctl(mib []_C_int) ([]byte, error) {
+	n := uintptr(0)
+	if err := _sysctl(mib, nil, &n, nil, 0); err != nil {
+		return nil, err
+	}
+	if n == 0 {
+		return nil, nil
+	}
+
+	buf := make([]byte, n)
+	if err := _sysctl(mib, &buf[0], &n, nil, 0); err != nil {
+		return nil, err
+	}
+	return buf[:n], nil
+}