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Source file src/os/wait_wait6.go

Documentation: os

  // 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 freebsd
  
  package os
  
  import (
  	"runtime"
  	"syscall"
  )
  
  const _P_PID = 0
  
  // blockUntilWaitable attempts to block until a call to p.Wait will
  // succeed immediately, and returns whether it has done so.
  // It does not actually call p.Wait.
  func (p *Process) blockUntilWaitable() (bool, error) {
  	var errno syscall.Errno
  	// The arguments on 32-bit FreeBSD look like the following:
  	// - freebsd32_wait6_args{ idtype, id1, id2, status, options, wrusage, info } or
  	// - freebsd32_wait6_args{ idtype, pad, id1, id2, status, options, wrusage, info } when PAD64_REQUIRED=1 on ARM, MIPS or PowerPC
  	if runtime.GOARCH == "386" {
  		_, _, errno = syscall.Syscall9(syscall.SYS_WAIT6, _P_PID, uintptr(p.Pid), 0, 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0, 0, 0)
  	} else if runtime.GOARCH == "arm" {
  		_, _, errno = syscall.Syscall9(syscall.SYS_WAIT6, _P_PID, 0, uintptr(p.Pid), 0, 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0, 0)
  	} else {
  		_, _, errno = syscall.Syscall6(syscall.SYS_WAIT6, _P_PID, uintptr(p.Pid), 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0)
  	}
  	runtime.KeepAlive(p)
  	if errno != 0 {
  		// The wait6 system call is supported only on FreeBSD
  		// 9.3 and above, so it may return an ENOSYS error.
  		if errno == syscall.ENOSYS {
  			return false, nil
  		}
  		return false, NewSyscallError("wait6", errno)
  	}
  	return true, nil
  }
  

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