mirror of git://gcc.gnu.org/git/gcc.git
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Copyright 2012 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 dragonfly freebsd linux netbsd openbsd
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package runtime
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import "unsafe"
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//go:noescape
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func sigfwd(fn uintptr, sig uint32, info *siginfo, ctx unsafe.Pointer)
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// Determines if the signal should be handled by Go and if not, forwards the
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// signal to the handler that was installed before Go's. Returns whether the
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// signal was forwarded.
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// This is called by the signal handler, and the world may be stopped.
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//go:nosplit
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//go:nowritebarrierrec
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func sigfwdgo(sig uint32, info *siginfo, ctx unsafe.Pointer) bool {
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if sig >= uint32(len(sigtable)) {
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return false
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}
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fwdFn := fwdSig[sig]
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if !signalsOK {
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// The only way we can get here is if we are in a
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// library or archive, we installed a signal handler
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// at program startup, but the Go runtime has not yet
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// been initialized.
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if fwdFn == _SIG_DFL {
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dieFromSignal(int32(sig))
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} else {
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sigfwd(fwdFn, sig, info, ctx)
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}
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return true
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}
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flags := sigtable[sig].flags
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// If there is no handler to forward to, no need to forward.
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if fwdFn == _SIG_DFL {
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return false
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}
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// If we aren't handling the signal, forward it.
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if flags&_SigHandling == 0 {
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sigfwd(fwdFn, sig, info, ctx)
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return true
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}
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// Only forward synchronous signals.
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c := &sigctxt{info, ctx}
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if c.sigcode() == _SI_USER || flags&_SigPanic == 0 {
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return false
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}
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// Determine if the signal occurred inside Go code. We test that:
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// (1) we were in a goroutine (i.e., m.curg != nil), and
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// (2) we weren't in CGO (i.e., m.curg.syscallsp == 0).
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g := getg()
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if g != nil && g.m != nil && g.m.curg != nil && g.m.curg.syscallsp == 0 {
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return false
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}
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// Signal not handled by Go, forward it.
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if fwdFn != _SIG_IGN {
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sigfwd(fwdFn, sig, info, ctx)
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}
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return true
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}
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