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76a50749 | 1 | /* Retrieve event. |
d614a753 | 2 | Copyright (C) 1999-2020 Free Software Foundation, Inc. |
76a50749 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 1999. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library 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 GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
19 | |
20 | #include <stddef.h> | |
21 | #include <string.h> | |
22 | ||
23 | #include "thread_dbP.h" | |
24 | ||
25 | ||
26 | td_err_e | |
7f08f55a | 27 | td_ta_event_getmsg (const td_thragent_t *ta_arg, td_event_msg_t *msg) |
76a50749 | 28 | { |
7f08f55a RM |
29 | td_thragent_t *const ta = (td_thragent_t *) ta_arg; |
30 | td_err_e err; | |
31 | psaddr_t eventbuf, eventnum, eventdata; | |
32 | psaddr_t thp, next; | |
33 | void *copy; | |
34 | ||
76a50749 UD |
35 | /* XXX I cannot think of another way but using a static variable. */ |
36 | /* XXX Use at least __thread once it is possible. */ | |
37 | static td_thrhandle_t th; | |
38 | ||
7f08f55a | 39 | LOG ("td_thr_event_getmsg"); |
76a50749 UD |
40 | |
41 | /* Test whether the TA parameter is ok. */ | |
42 | if (! ta_ok (ta)) | |
43 | return TD_BADTA; | |
44 | ||
45 | /* Get the pointer to the thread descriptor with the last event. */ | |
7f08f55a RM |
46 | err = DB_GET_VALUE (thp, ta, __nptl_last_event, 0); |
47 | if (err != TD_OK) | |
48 | return err; | |
76a50749 | 49 | |
7f08f55a | 50 | if (thp == 0) |
58a851f1 | 51 | /* Nothing waiting. */ |
76a50749 UD |
52 | return TD_NOMSG; |
53 | ||
7f08f55a RM |
54 | /* Copy the event message buffer in from the inferior. */ |
55 | err = DB_GET_FIELD_ADDRESS (eventbuf, ta, thp, pthread, eventbuf, 0); | |
56 | if (err == TD_OK) | |
57 | err = DB_GET_STRUCT (copy, ta, eventbuf, td_eventbuf_t); | |
58 | if (err != TD_OK) | |
59 | return err; | |
60 | ||
61 | /* Read the event details from the target thread. */ | |
62 | err = DB_GET_FIELD_LOCAL (eventnum, ta, copy, td_eventbuf_t, eventnum, 0); | |
63 | if (err != TD_OK) | |
64 | return err; | |
76a50749 | 65 | /* If the structure is on the list there better be an event recorded. */ |
7f08f55a | 66 | if ((int) (uintptr_t) eventnum == TD_EVENT_NONE) |
8cfb7315 | 67 | return TD_DBERR; |
76a50749 | 68 | |
7f08f55a RM |
69 | /* Fill the user's data structure. */ |
70 | err = DB_GET_FIELD_LOCAL (eventdata, ta, copy, td_eventbuf_t, eventdata, 0); | |
71 | if (err != TD_OK) | |
72 | return err; | |
73 | ||
76a50749 UD |
74 | /* Generate the thread descriptor. */ |
75 | th.th_ta_p = (td_thragent_t *) ta; | |
7f08f55a | 76 | th.th_unique = thp; |
76a50749 UD |
77 | |
78 | /* Fill the user's data structure. */ | |
7f08f55a RM |
79 | msg->msg.data = (uintptr_t) eventdata; |
80 | msg->event = (uintptr_t) eventnum; | |
76a50749 | 81 | msg->th_p = &th; |
76a50749 | 82 | |
8cfb7315 | 83 | /* And clear the event message in the target. */ |
7f08f55a RM |
84 | memset (copy, 0, ta->ta_sizeof_td_eventbuf_t); |
85 | err = DB_PUT_STRUCT (ta, eventbuf, td_eventbuf_t, copy); | |
86 | if (err != TD_OK) | |
87 | return err; | |
8cfb7315 | 88 | |
76a50749 | 89 | /* Get the pointer to the next descriptor with an event. */ |
7f08f55a RM |
90 | err = DB_GET_FIELD (next, ta, thp, pthread, nextevent, 0); |
91 | if (err != TD_OK) | |
92 | return err; | |
8cfb7315 | 93 | |
76a50749 | 94 | /* Store the pointer in the list head variable. */ |
7f08f55a RM |
95 | err = DB_PUT_VALUE (ta, __nptl_last_event, 0, next); |
96 | if (err != TD_OK) | |
97 | return err; | |
98 | ||
99 | if (next != 0) | |
100 | /* Clear the next pointer in the current descriptor. */ | |
101 | err = DB_PUT_FIELD (ta, thp, pthread, nextevent, 0, 0); | |
102 | ||
103 | return err; | |
76a50749 | 104 | } |