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[glibc.git] / linuxthreads_db / td_ta_event_getmsg.c
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1 /* Retrieve event.
2 Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <stddef.h>
22 #include <string.h>
24 #include "thread_dbP.h"
25 #include <linuxthreads/internals.h>
28 td_err_e
29 td_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg)
31 /* XXX I cannot think of another way but using a static variable. */
32 static td_thrhandle_t th;
33 td_eventbuf_t event;
34 psaddr_t addr;
36 LOG ("td_ta_event_getmsg");
38 /* Test whether the TA parameter is ok. */
39 if (! ta_ok (ta))
40 return TD_BADTA;
42 /* Get the pointer to the thread descriptor with the last event. */
43 if (ps_pdread (ta->ph, ta->pthread_last_event,
44 &addr, sizeof (void *)) != PS_OK)
45 return TD_ERR; /* XXX Other error value? */
47 /* If the pointer is NULL no event occurred. */
48 if (addr == 0)
49 return TD_NOMSG;
51 /* Read the even structure from the target. */
52 if (ps_pdread (ta->ph,
53 ((char *) addr
54 + offsetof (struct _pthread_descr_struct, p_eventbuf)),
55 &event, sizeof (td_eventbuf_t)) != PS_OK)
56 return TD_ERR; /* XXX Other error value? */
58 /* Check whether an event occurred. */
59 if (event.eventnum == TD_EVENT_NONE)
61 /* Oh well, this means the last event was already read. So
62 we have to look for any other event. */
63 struct pthread_handle_struct handles[ta->pthread_threads_max];
64 int num;
65 int i;
67 /* Read the number of currently active threads. */
68 if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int))
69 != PS_OK)
70 return TD_ERR; /* XXX Other error value? */
72 /* Now read the handles. */
73 if (ps_pdread (ta->ph, ta->handles, handles,
74 ta->pthread_threads_max * sizeof (handles[0])) != PS_OK)
75 return TD_ERR; /* XXX Other error value? */
77 for (i = 0; i < ta->pthread_threads_max && num > 0; ++i)
79 if (handles[i].h_descr == NULL)
80 /* No entry here. */
81 continue;
83 /* First count this active thread. */
84 --num;
86 if (handles[i].h_descr == addr)
87 /* We already handled this. */
88 continue;
90 /* Read the event data for this thread. */
91 if (ps_pdread (ta->ph,
92 ((char *) handles[i].h_descr
93 + offsetof (struct _pthread_descr_struct,
94 p_eventbuf)),
95 &event, sizeof (td_eventbuf_t)) != PS_OK)
96 return TD_ERR;
98 if (event.eventnum != TD_EVENT_NONE)
100 /* We found a thread with an unreported event. */
101 addr = handles[i].h_descr;
102 break;
106 /* If we haven't found any other event signal this to the user. */
107 if (event.eventnum == TD_EVENT_NONE)
108 return TD_NOMSG;
111 /* Generate the thread descriptor. */
112 th.th_ta_p = (td_thragent_t *) ta;
113 th.th_unique = addr;
115 /* Fill the user's data structure. */
116 msg->event = event.eventnum;
117 msg->th_p = &th;
118 msg->msg.data = (uintptr_t) event.eventdata;
120 /* And clear the event message in the target. */
121 memset (&event, '\0', sizeof (td_eventbuf_t));
122 if (ps_pdwrite (ta->ph,
123 ((char *) addr
124 + offsetof (struct _pthread_descr_struct, p_eventbuf)),
125 &event, sizeof (td_eventbuf_t)) != PS_OK)
126 return TD_ERR; /* XXX Other error value? */
128 return TD_OK;