| // Copyright 2017 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. |
| |
| package socket |
| |
| import ( |
| "syscall" |
| "unsafe" |
| ) |
| |
| func probeProtocolStack() int { |
| var p uintptr |
| align := int(unsafe.Sizeof(p)) |
| // In the case of kern.supported_archs="amd64 i386", we need |
| // to know the underlying kernel's architecture because the |
| // alignment for socket facilities are set at the build time |
| // of the kernel. |
| conf, _ := syscall.Sysctl("kern.conftxt") |
| for i, j := 0, 0; j < len(conf); j++ { |
| if conf[j] != '\n' { |
| continue |
| } |
| s := conf[i:j] |
| i = j + 1 |
| if len(s) > len("machine") && s[:len("machine")] == "machine" { |
| s = s[len("machine"):] |
| for k := 0; k < len(s); k++ { |
| if s[k] == ' ' || s[k] == '\t' { |
| s = s[1:] |
| } |
| break |
| } |
| if s == "amd64" { |
| align = 8 |
| } |
| break |
| } |
| } |
| return align |
| } |
