1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build darwin dragonfly freebsd linux netbsd openbsd solaris 6 7 package runtime 8 9 import "unsafe" 10 11 //go:linkname os_sigpipe os.sigpipe 12 func os_sigpipe() { 13 systemstack(sigpipe) 14 } 15 16 // Determines if the signal should be handled by Go and if not, forwards the 17 // signal to the handler that was installed before Go's. Returns whether the 18 // signal was forwarded. 19 //go:nosplit 20 func sigfwdgo(sig uint32, info *siginfo, ctx unsafe.Pointer) bool { 21 g := getg() 22 c := &sigctxt{info, ctx} 23 if sig >= uint32(len(sigtable)) { 24 return false 25 } 26 fwdFn := fwdSig[sig] 27 flags := sigtable[sig].flags 28 29 // If there is no handler to forward to, no need to forward. 30 if fwdFn == _SIG_DFL { 31 return false 32 } 33 // Only forward synchronous signals. 34 if c.sigcode() == _SI_USER || flags&_SigPanic == 0 { 35 return false 36 } 37 // Determine if the signal occurred inside Go code. We test that: 38 // (1) we were in a goroutine (i.e., m.curg != nil), and 39 // (2) we weren't in CGO (i.e., m.curg.syscallsp == 0). 40 if g != nil && g.m != nil && g.m.curg != nil && g.m.curg.syscallsp == 0 { 41 return false 42 } 43 // Signal not handled by Go, forward it. 44 if fwdFn != _SIG_IGN { 45 sigfwd(fwdFn, sig, info, ctx) 46 } 47 return true 48 } 49
