1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build freebsd 6 7 package os 8 9 import ( 10 "runtime" 11 "syscall" 12 ) 13 14 const _P_PID = 0 15 16 // blockUntilWaitable attempts to block until a call to p.Wait will 17 // succeed immediately, and returns whether it has done so. 18 // It does not actually call p.Wait. 19 func (p *Process) blockUntilWaitable() (bool, error) { 20 var errno syscall.Errno 21 // The arguments on 32-bit FreeBSD look like the following: 22 // - freebsd32_wait6_args{ idtype, id1, id2, status, options, wrusage, info } or 23 // - freebsd32_wait6_args{ idtype, pad, id1, id2, status, options, wrusage, info } when PAD64_REQUIRED=1 on ARM, MIPS or PowerPC 24 if runtime.GOARCH == "386" { 25 _, _, errno = syscall.Syscall9(syscall.SYS_WAIT6, _P_PID, uintptr(p.Pid), 0, 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0, 0, 0) 26 } else if runtime.GOARCH == "arm" { 27 _, _, errno = syscall.Syscall9(syscall.SYS_WAIT6, _P_PID, 0, uintptr(p.Pid), 0, 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0, 0) 28 } else { 29 _, _, errno = syscall.Syscall6(syscall.SYS_WAIT6, _P_PID, uintptr(p.Pid), 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0) 30 } 31 runtime.KeepAlive(p) 32 if errno != 0 { 33 return false, NewSyscallError("wait6", errno) 34 } 35 return true, nil 36 } 37
