1/* Native debugging support for GNU/Linux (LWP layer).
2   Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3
4   This file is part of GDB.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 59 Temple Place - Suite 330,
19   Boston, MA 02111-1307, USA.  */
20
21#include "target.h"
22
23/* Structure describing an LWP.  */
24
25struct lwp_info
26{
27  /* The process id of the LWP.  This is a combination of the LWP id
28     and overall process id.  */
29  ptid_t ptid;
30
31  /* Non-zero if this LWP is cloned.  In this context "cloned" means
32     that the LWP is reporting to its parent using a signal other than
33     SIGCHLD.  */
34  int cloned;
35
36  /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
37     it back yet).  */
38  int signalled;
39
40  /* Non-zero if this LWP is stopped.  */
41  int stopped;
42
43  /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
44     can be marked both as stopped and resumed at the same time.  This
45     happens if we try to resume an LWP that has a wait status
46     pending.  We shouldn't let the LWP run until that wait status has
47     been processed, but we should not report that wait status if GDB
48     didn't try to let the LWP run.  */
49  int resumed;
50
51  /* If non-zero, a pending wait status.  */
52  int status;
53
54  /* Non-zero if we were stepping this LWP.  */
55  int step;
56
57  /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
58     for this LWP's last event.  This may correspond to STATUS above,
59     or to a local variable in lin_lwp_wait.  */
60  struct target_waitstatus waitstatus;
61
62  /* Next LWP in list.  */
63  struct lwp_info *next;
64};
65
66/* Read/write to target memory via the Linux kernel's "proc file
67   system".  */
68struct mem_attrib;
69struct target_ops;
70
71extern int linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len,
72				   int write, struct mem_attrib *attrib,
73				   struct target_ops *target);
74
75/* Find process PID's pending signal set from /proc/pid/status.  */
76void linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored);
77
78/* linux-nat functions for handling fork events.  */
79extern void linux_record_stopped_pid (int pid);
80extern void linux_enable_event_reporting (ptid_t ptid);
81extern ptid_t linux_handle_extended_wait (int pid, int status,
82					  struct target_waitstatus *ourstatus);
83extern void linux_child_post_startup_inferior (ptid_t ptid);
84
85/* Iterator function for lin-lwp's lwp list.  */
86struct lwp_info *iterate_over_lwps (int (*callback) (struct lwp_info *,
87						     void *),
88				    void *data);
89