runtime: unify sigTabT type across Unix systems

Change-Id: I8e8a3a118b1216f191c9076b70a88f6f3f19f79f
Reviewed-on: https://go-review.googlesource.com/59150
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/runtime2.go

@@ -594,6 +594,7 @@ const (
 	_LockInternal = 2
 )
 
+// Values for the flags field of a sigTabT.
 const (
 	_SigNotify   = 1 << iota // let signal.Notify have signal, even if from kernel
 	_SigKill                 // if signal.Notify doesn't take it, exit quietly

src/runtime/signal_darwin.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/* 0 */ {0, "SIGNONE: no trap"},
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/signal_dragonfly.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/* 0 */ {0, "SIGNONE: no trap"},
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/signal_freebsd.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/* 0 */ {0, "SIGNONE: no trap"},
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/signal_netbsd.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/*  0 */ {0, "SIGNONE: no trap"},
 	/*  1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/signal_openbsd.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/*  0 */ {0, "SIGNONE: no trap"},
 	/*  1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/signal_solaris.go

@@ -4,11 +4,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/* 0 */ {0, "SIGNONE: no trap"},
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: hangup"},

src/runtime/signal_unix.go

@@ -11,6 +11,16 @@ import (
 	"unsafe"
 )
 
+// sigTabT is the type of an entry in the global sigtable array.
+// sigtable is inherently system dependent, and appears in OS-specific files,
+// but sigTabT is the same for all Unixy systems.
+// The sigtable array is indexed by a system signal number to get the flags
+// and printable name of each signal.
+type sigTabT struct {
+	flags int32
+	name  string
+}
+
 //go:linkname os_sigpipe os.sigpipe
 func os_sigpipe() {
 	systemstack(sigpipe)

src/runtime/sigtab_linux_generic.go

@@ -10,11 +10,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/* 0 */ {0, "SIGNONE: no trap"},
 	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},

src/runtime/sigtab_linux_mipsx.go

@@ -7,11 +7,6 @@
 
 package runtime
 
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
 var sigtable = [...]sigTabT{
 	/*  0 */ {0, "SIGNONE: no trap"},
 	/*  1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},