* We store the ID of the controlling terminal and the foreground process

group ID with the session and let the terminal update them.
* Added an "orphaned" flag to the process_group structure and code to
  maintain it.
* Handle the death of a controlling process correctly: The
  foreground process group gets a SIGHUP and all newly-orphaned process
  groups containing at least one stopped processes are sent
  SIGHUP+SIGCONT.
* The tty handles the O_NOCTTY flag correctly, now.
* The tty handles reads/writes from processes from other sessions
  correctly, now.
* Handle tcsetpgrp() from background processes correctly.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22187 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/fcntl.h

@@ -40,7 +40,7 @@
 #define	O_EXCL			0x0100		/* exclusive creat */
 #define O_CREAT			0x0200		/* create and open file */
 #define O_TRUNC			0x0400		/* open with truncation */
-#define O_NOCTTY		0x1000		/* currently unsupported */
+#define O_NOCTTY		0x1000		/* don't make tty the controlling tty */
 #define	O_NOTRAVERSE	0x2000		/* do not traverse leaf link */
 
 /* flags for open() and fcntl() */

headers/private/kernel/team.h

@@ -38,6 +38,9 @@ int32 team_used_teams(void);
 
 void team_set_job_control_state(struct team* team, job_control_state newState,
 			int signal, bool threadsLocked);
+void team_set_controlling_tty(int32 index);
+int32 team_get_controlling_tty();
+status_t team_set_foreground_process_group(int32 ttyIndex, pid_t processGroup);
 
 status_t start_watching_team(team_id team, void (*hook)(team_id, void *),
 			void *data);

headers/private/kernel/thread_types.h

@@ -67,6 +67,9 @@ struct death_entry {
 struct process_session {
 	pid_t				id;
 	int32				group_count;
+	int32				controlling_tty;	// index of the controlling tty,
+											// -1 if none
+	pid_t				foreground_group;
 };
 
 struct process_group {
@@ -74,6 +77,7 @@ struct process_group {
 	struct process_session *session;
 	pid_t				id;
 	struct team			*teams;
+	bool				orphaned;
 };
 
 struct team_loading_info {