+/* Create a new session if the inferior will run in a different tty.
+ A session is UNIX's way of grouping processes that share a controlling
+ terminal, so a new one is needed if the inferior terminal will be
+ different from GDB's.
+
+ Returns the session id of the new session, 0 if no session was created
+ or -1 if an error occurred. */
+pid_t
+create_tty_session (void)
+{
+#ifdef HAVE_SETSID
+ pid_t ret;
+
+ if (!job_control || inferior_thisrun_terminal == 0)
+ return 0;
+
+ ret = setsid ();
+ if (ret == -1)
+ warning ("Failed to create new terminal session: setsid: %s",
+ safe_strerror (errno));
+
+ return ret;
+#else
+ return 0;
+#endif /* HAVE_SETSID */
+}
+