1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/* Native-dependent code for OpenBSD.
Copyright (C) 2012-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbthread.h"
#include "inferior.h"
#include "target.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include "gdb_wait.h"
#include "inf-child.h"
#include "obsd-nat.h"
/* OpenBSD 5.2 and later include rthreads which uses a thread model
that maps userland threads directly onto kernel threads in a 1:1
fashion. */
#ifdef PT_GET_THREAD_FIRST
static char *
obsd_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
if (ptid_get_lwp (ptid) != 0)
{
static char buf[64];
xsnprintf (buf, sizeof buf, "thread %ld", ptid_get_lwp (ptid));
return buf;
}
return normal_pid_to_str (ptid);
}
static void
obsd_update_thread_list (struct target_ops *ops)
{
pid_t pid = ptid_get_pid (inferior_ptid);
struct ptrace_thread_state pts;
prune_threads ();
if (ptrace (PT_GET_THREAD_FIRST, pid, (caddr_t)&pts, sizeof pts) == -1)
perror_with_name (("ptrace"));
while (pts.pts_tid != -1)
{
ptid_t ptid = ptid_build (pid, pts.pts_tid, 0);
if (!in_thread_list (ptid))
{
if (ptid_get_lwp (inferior_ptid) == 0)
thread_change_ptid (inferior_ptid, ptid);
else
add_thread (ptid);
}
if (ptrace (PT_GET_THREAD_NEXT, pid, (caddr_t)&pts, sizeof pts) == -1)
perror_with_name (("ptrace"));
}
}
static ptid_t
obsd_wait (struct target_ops *ops,
ptid_t ptid, struct target_waitstatus *ourstatus, int options)
{
pid_t pid;
int status, save_errno;
do
{
set_sigint_trap ();
do
{
pid = waitpid (ptid_get_pid (ptid), &status, 0);
save_errno = errno;
}
while (pid == -1 && errno == EINTR);
clear_sigint_trap ();
if (pid == -1)
{
fprintf_unfiltered (gdb_stderr,
_("Child process unexpectedly missing: %s.\n"),
safe_strerror (save_errno));
/* Claim it exited with unknown signal. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
return inferior_ptid;
}
/* Ignore terminated detached child processes. */
if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
pid = -1;
}
while (pid == -1);
ptid = pid_to_ptid (pid);
if (WIFSTOPPED (status))
{
ptrace_state_t pe;
pid_t fpid;
if (ptrace (PT_GET_PROCESS_STATE, pid, (caddr_t)&pe, sizeof pe) == -1)
perror_with_name (("ptrace"));
switch (pe.pe_report_event)
{
case PTRACE_FORK:
ourstatus->kind = TARGET_WAITKIND_FORKED;
ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid);
/* Make sure the other end of the fork is stopped too. */
fpid = waitpid (pe.pe_other_pid, &status, 0);
if (fpid == -1)
perror_with_name (("waitpid"));
if (ptrace (PT_GET_PROCESS_STATE, fpid,
(caddr_t)&pe, sizeof pe) == -1)
perror_with_name (("ptrace"));
gdb_assert (pe.pe_report_event == PTRACE_FORK);
gdb_assert (pe.pe_other_pid == pid);
if (fpid == ptid_get_pid (inferior_ptid))
{
ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid);
return pid_to_ptid (fpid);
}
return pid_to_ptid (pid);
}
ptid = ptid_build (pid, pe.pe_tid, 0);
if (!in_thread_list (ptid))
{
if (ptid_get_lwp (inferior_ptid) == 0)
thread_change_ptid (inferior_ptid, ptid);
else
add_thread (ptid);
}
}
store_waitstatus (ourstatus, status);
return ptid;
}
void
obsd_add_target (struct target_ops *t)
{
/* Override some methods to support threads. */
t->to_pid_to_str = obsd_pid_to_str;
t->to_update_thread_list = obsd_update_thread_list;
t->to_wait = obsd_wait;
add_target (t);
}
#else
void
obsd_add_target (struct target_ops *t)
{
add_target (t);
}
#endif /* PT_GET_THREAD_FIRST */
|
