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runtime: add test for signalM

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For #10958, #24543.

Change-Id: Ib009a83fe02bc623894f4908fe8f6b266382ba95
Reviewed-on: https://go-review.googlesource.com/c/go/+/201404
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Austin Clements 2019-10-14 20:10:48 -04:00
parent 42aab4b0af
commit 8dc1a158e4
3 changed files with 82 additions and 3 deletions
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11
src/runtime/signal_unix.go
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@ -412,10 +412,11 @@ func adjustSignalStack(sig uint32, mp *m, gsigStack *gsignalStack) bool {
// GOTRACEBACK=crash when a signal is received.
var crashing int32
// testSigtrap is used by the runtime tests. If non-nil, it is called
// on SIGTRAP. If it returns true, the normal behavior on SIGTRAP is
// suppressed.
// testSigtrap and testSigusr1 are used by the runtime tests. If
// non-nil, it is called on SIGTRAP/SIGUSR1. If it returns true, the
// normal behavior on this signal is suppressed.
var testSigtrap func(info *siginfo, ctxt *sigctxt, gp *g) bool
var testSigusr1 func(gp *g) bool
// sighandler is invoked when a signal occurs. The global g will be
// set to a gsignal goroutine and we will be running on the alternate
@ -441,6 +442,10 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
return
}
if sig == _SIGUSR1 && testSigusr1 != nil && testSigusr1(gp) {
return
}
flags := int32(_SigThrow)
if sig < uint32(len(sigtable)) {
flags = sigtable[sig].flags