Source file src/pkg/os/wait_wait6.go

     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 reports 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	

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