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76a50749 | 1 | /* Validate a thread handle. |
d11dc9ec RM |
2 | Copyright (C) 1999,2001,2002,2003,2004,2007,2008 |
3 | Free Software Foundation, Inc. | |
76a50749 UD |
4 | This file is part of the GNU C Library. |
5 | Contributed by Ulrich Drepper <drepper@redhat.com>, 1999. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
20 | |
21 | #include "thread_dbP.h" | |
090addb4 | 22 | #include <stdbool.h> |
76a50749 UD |
23 | |
24 | static td_err_e | |
090addb4 | 25 | check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit) |
76a50749 | 26 | { |
7f08f55a RM |
27 | td_err_e err; |
28 | psaddr_t next, ofs; | |
29 | ||
30 | err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0); | |
31 | if (err == TD_OK) | |
32 | { | |
33 | if (next == 0) | |
090addb4 RM |
34 | { |
35 | *uninit = true; | |
36 | return TD_NOTHR; | |
37 | } | |
7f08f55a RM |
38 | err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0); |
39 | } | |
40 | ||
41 | while (err == TD_OK) | |
42 | { | |
43 | if (next == head) | |
44 | return TD_NOTHR; | |
45 | ||
46 | if (next - (ofs - (psaddr_t) 0) == th->th_unique) | |
47 | return TD_OK; | |
48 | ||
49 | err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0); | |
50 | } | |
51 | ||
52 | return err; | |
76a50749 UD |
53 | } |
54 | ||
55 | ||
56 | td_err_e | |
57 | td_thr_validate (const td_thrhandle_t *th) | |
58 | { | |
7f08f55a RM |
59 | td_err_e err; |
60 | psaddr_t list; | |
61 | ||
76a50749 UD |
62 | LOG ("td_thr_validate"); |
63 | ||
64 | /* First check the list with threads using user allocated stacks. */ | |
090addb4 | 65 | bool uninit = false; |
7f08f55a RM |
66 | err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user); |
67 | if (err == TD_OK) | |
090addb4 | 68 | err = check_thread_list (th, list, &uninit); |
76a50749 UD |
69 | |
70 | /* If our thread is not on this list search the list with stack | |
71 | using implementation allocated stacks. */ | |
7f08f55a RM |
72 | if (err == TD_NOTHR) |
73 | { | |
74 | err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used); | |
75 | if (err == TD_OK) | |
090addb4 RM |
76 | err = check_thread_list (th, list, &uninit); |
77 | ||
7d9d8bd1 RM |
78 | if (err == TD_NOTHR && uninit && th->th_unique == 0) |
79 | /* __pthread_initialize_minimal has not run yet. | |
80 | There is only the special case thread handle. */ | |
81 | err = TD_OK; | |
7f08f55a | 82 | } |
76a50749 | 83 | |
d11dc9ec RM |
84 | if (err == TD_OK) |
85 | { | |
86 | /* Verify that this is not a stale element in a fork child. */ | |
87 | pid_t match_pid = ps_getpid (th->th_ta_p->ph); | |
88 | psaddr_t pid; | |
89 | err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique, pthread, pid, 0); | |
90 | if (err == TD_OK && (pid_t) (uintptr_t) pid < 0) | |
91 | { | |
92 | /* This was a thread that was about to fork, or it is the new sole | |
93 | thread in a fork child. In the latter case, its tid was stored | |
94 | via CLONE_CHILD_SETTID and so is already the proper child PID. */ | |
95 | if (-(pid_t) (uintptr_t) pid == match_pid) | |
96 | /* It is about to do a fork, but is really still the parent PID. */ | |
97 | pid = (psaddr_t) (uintptr_t) match_pid; | |
98 | else | |
99 | /* It must be a fork child, whose new PID is in the tid field. */ | |
100 | err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique, | |
101 | pthread, tid, 0); | |
102 | } | |
103 | if (err == TD_OK && (pid_t) (uintptr_t) pid != match_pid) | |
104 | err = TD_NOTHR; | |
105 | } | |
106 | ||
7f08f55a | 107 | return err; |
76a50749 | 108 | } |