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// Copyright 2017 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 unix
package runtime
import "unsafe"
var NonblockingPipe = nonblockingPipe
var Fcntl = fcntl
var Closeonexec = closeonexec
func sigismember(mask *sigset, i int) bool {
clear := *mask
sigdelset(&clear, i)
return clear != *mask
}
func Sigisblocked(i int) bool {
var sigmask sigset
sigprocmask(_SIG_SETMASK, nil, &sigmask)
return sigismember(&sigmask, i)
}
type M = m
var waitForSigusr1 struct {
rdpipe int32
wrpipe int32
mID int64
}
// WaitForSigusr1 blocks until a SIGUSR1 is received. It calls ready
// when it is set up to receive SIGUSR1. The ready function should
// cause a SIGUSR1 to be sent. The r and w arguments are a pipe that
// the signal handler can use to report when the signal is received.
//
// Once SIGUSR1 is received, it returns the ID of the current M and
// the ID of the M the SIGUSR1 was received on. If the caller writes
// a non-zero byte to w, WaitForSigusr1 returns immediately with -1, -1.
func WaitForSigusr1(r, w int32, ready func(mp *M)) (int64, int64) {
lockOSThread()
// Make sure we can receive SIGUSR1.
unblocksig(_SIGUSR1)
waitForSigusr1.rdpipe = r
waitForSigusr1.wrpipe = w
mp := getg().m
testSigusr1 = waitForSigusr1Callback
ready(mp)
// Wait for the signal. We use a pipe rather than a note
// because write is always async-signal-safe.
entersyscallblock()
var b byte
read(waitForSigusr1.rdpipe, noescape(unsafe.Pointer(&b)), 1)
exitsyscall()
gotM := waitForSigusr1.mID
testSigusr1 = nil
unlockOSThread()
if b != 0 {
// timeout signal from caller
return -1, -1
}
return mp.id, gotM
}
// waitForSigusr1Callback is called from the signal handler during
// WaitForSigusr1. It must not have write barriers because there may
// not be a P.
//
//go:nowritebarrierrec
func waitForSigusr1Callback(gp *g) bool {
if gp == nil || gp.m == nil {
waitForSigusr1.mID = -1
} else {
waitForSigusr1.mID = gp.m.id
}
b := byte(0)
write(uintptr(waitForSigusr1.wrpipe), noescape(unsafe.Pointer(&b)), 1)
return true
}
// SendSigusr1 sends SIGUSR1 to mp.
func SendSigusr1(mp *M) {
signalM(mp, _SIGUSR1)
}
const (
O_WRONLY = _O_WRONLY
O_CREAT = _O_CREAT
O_TRUNC = _O_TRUNC
)