Create new session/process grp for forked process

proc/exec_darwin.c

@@ -34,6 +34,15 @@ fork_exec(char *argv0, char **argv, int size,
 	read(fd[0], &sig, 1);
 	close(fd[0]);
 
+	// Create a new session for this process.
+	if (setsid() < 0) {
+		// Could not set session, but still want to create
+		// a new process group.
+		if (setpgid(0, 0) < 0) {
+			return -1;
+		}
+	}
+
 	// Set errno to zero before a call to ptrace.
 	// It is documented that ptrace can return -1 even
 	// for successful calls.

proc/proc_darwin.go

@@ -98,7 +98,7 @@ func Attach(pid int) (*Process, error) {
 }
 
 func (dbp *Process) Kill() (err error) {
-	err = sys.Kill(dbp.Pid, sys.SIGKILL)
+	err = sys.Kill(-dbp.Pid, sys.SIGKILL)
 	if err != nil {
 		return errors.New("could not deliver signal: " + err.Error())
 	}

proc/proc_linux.go

@@ -43,7 +43,7 @@ func Launch(cmd []string) (*Process, error) {
 		proc.Args = cmd
 		proc.Stdout = os.Stdout
 		proc.Stderr = os.Stderr
-		proc.SysProcAttr = &syscall.SysProcAttr{Ptrace: true}
+		proc.SysProcAttr = &syscall.SysProcAttr{Ptrace: true, Setsid: true}
 		err = proc.Start()
 	})
 	if err != nil {