diff options
Diffstat (limited to 'src/vendor/golang_org/x/net/route/syscall.go')
-rw-r--r-- | src/vendor/golang_org/x/net/route/syscall.go | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/vendor/golang_org/x/net/route/syscall.go b/src/vendor/golang_org/x/net/route/syscall.go new file mode 100644 index 0000000000..d136325a30 --- /dev/null +++ b/src/vendor/golang_org/x/net/route/syscall.go @@ -0,0 +1,33 @@ +// Copyright 2016 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. + +// +build darwin dragonfly freebsd netbsd openbsd + +package route + +import ( + "syscall" + "unsafe" +) + +// TODO: replace with runtime.KeepAlive when available +//go:noescape +func keepAlive(p unsafe.Pointer) + +var zero uintptr + +func sysctl(mib []int32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error { + var p unsafe.Pointer + if len(mib) > 0 { + p = unsafe.Pointer(&mib[0]) + } else { + p = unsafe.Pointer(&zero) + } + _, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(p), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen)) + keepAlive(p) + if errno != 0 { + return error(errno) + } + return nil +} |