exp/ssh: export type signal. Renamed to Signal

R=dave, agl, rsc, golang-dev, n13m3y3r
CC=golang-dev
https://golang.org/cl/5450059

src/pkg/exp/ssh/session.go

@@ -15,23 +15,23 @@ import (
 	"io/ioutil"
 )
 
-type signal string
+type Signal string
 
 // POSIX signals as listed in RFC 4254 Section 6.10.
 const (
-	SIGABRT signal = "ABRT"
-	SIGALRM signal = "ALRM"
-	SIGFPE  signal = "FPE"
-	SIGHUP  signal = "HUP"
-	SIGILL  signal = "ILL"
-	SIGINT  signal = "INT"
-	SIGKILL signal = "KILL"
-	SIGPIPE signal = "PIPE"
-	SIGQUIT signal = "QUIT"
-	SIGSEGV signal = "SEGV"
-	SIGTERM signal = "TERM"
-	SIGUSR1 signal = "USR1"
-	SIGUSR2 signal = "USR2"
+	SIGABRT Signal = "ABRT"
+	SIGALRM Signal = "ALRM"
+	SIGFPE  Signal = "FPE"
+	SIGHUP  Signal = "HUP"
+	SIGILL  Signal = "ILL"
+	SIGINT  Signal = "INT"
+	SIGKILL Signal = "KILL"
+	SIGPIPE Signal = "PIPE"
+	SIGQUIT Signal = "QUIT"
+	SIGSEGV Signal = "SEGV"
+	SIGTERM Signal = "TERM"
+	SIGUSR1 Signal = "USR1"
+	SIGUSR2 Signal = "USR2"
 )
 
 // A Session represents a connection to a remote command or shell.
@@ -130,7 +130,7 @@ type signalMsg struct {
 
 // Signal sends the given signal to the remote process.
 // sig is one of the SIG* constants.
-func (s *Session) Signal(sig signal) error {
+func (s *Session) Signal(sig Signal) error {
 	req := signalMsg{
 		PeersId:   s.peersId,
 		Request:   "signal",