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/* Native-dependent code for OpenBSD.
Copyright (C) 2012-2018 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 const 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 */
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