// 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. //go:build dragonfly || freebsd || netbsd // +build dragonfly freebsd netbsd package os import ( "runtime" "syscall" ) const _P_PID = 0 // blockUntilWaitable attempts to block until a call to p.Wait will // succeed immediately, and reports whether it has done so. // It does not actually call p.Wait. func (p *Process) blockUntilWaitable() (bool, error) { var errno syscall.Errno for { // 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.GOOS == "freebsd" && 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.GOOS == "freebsd" && 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) } if errno != syscall.EINTR { break } } runtime.KeepAlive(p) if errno == syscall.ENOSYS { return false, nil } else if errno != 0 { return false, NewSyscallError("wait6", errno) } return true, nil }