mirror of git://gcc.gnu.org/git/gcc.git
41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin linux
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package os
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import (
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"runtime"
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"syscall"
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"unsafe"
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)
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const _P_PID = 1
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// blockUntilWaitable attempts to block until a call to p.Wait will
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// succeed immediately, and returns whether it has done so.
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// It does not actually call p.Wait.
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func (p *Process) blockUntilWaitable() (bool, error) {
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// The waitid system call expects a pointer to a siginfo_t,
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// which is 128 bytes on all GNU/Linux systems.
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// On Darwin, it requires greater than or equal to 64 bytes
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// for darwin/{386,arm} and 104 bytes for darwin/amd64.
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// We don't care about the values it returns.
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var siginfo [128]byte
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psig := &siginfo[0]
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_, _, e := syscall.Syscall6(syscall.SYS_WAITID, _P_PID, uintptr(p.Pid), uintptr(unsafe.Pointer(psig)), syscall.WEXITED|syscall.WNOWAIT, 0, 0)
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runtime.KeepAlive(psig)
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if e != 0 {
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// waitid has been available since Linux 2.6.9, but
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// reportedly is not available in Ubuntu on Windows.
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// See issue 16610.
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if e == syscall.ENOSYS {
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return false, nil
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}
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return false, NewSyscallError("waitid", e)
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}
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return true, nil
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}
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