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/* Native-dependent code for OpenBSD.
Copyright (C) 2012-2021 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 "gdbsupport/gdb_wait.h"
#include "inf-ptrace.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. */
std::string
obsd_nat_target::pid_to_str (ptid_t ptid)
{
if (ptid.lwp () != 0)
return string_printf ("thread %ld of process %d", ptid.lwp (), ptid.pid ());
return normal_pid_to_str (ptid);
}
void
obsd_nat_target::update_thread_list ()
{
pid_t pid = inferior_ptid.pid ();
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_t (pid, pts.pts_tid, 0);
if (!in_thread_list (this, ptid))
{
if (inferior_ptid.lwp () == 0)
thread_change_ptid (this, inferior_ptid, ptid);
else
add_thread (this, ptid);
}
if (ptrace (PT_GET_THREAD_NEXT, pid, (caddr_t)&pts, sizeof pts) == -1)
perror_with_name (("ptrace"));
}
}
/* Enable additional event reporting on a new or existing process. */
static void
obsd_enable_proc_events (pid_t pid)
{
ptrace_event_t pe;
/* Set the initial event mask. */
memset (&pe, 0, sizeof pe);
pe.pe_set_event |= PTRACE_FORK;
if (ptrace (PT_SET_EVENT_MASK, pid,
(PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
perror_with_name (("ptrace"));
}
ptid_t
obsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
target_wait_flags options)
{
ptid_t wptid = inf_ptrace_target::wait (ptid, ourstatus, options);
if (ourstatus->kind () == TARGET_WAITKIND_STOPPED)
{
ptrace_state_t pe;
pid_t pid = wptid.pid ();
if (ptrace (PT_GET_PROCESS_STATE, pid, (caddr_t)&pe, sizeof pe) == -1)
perror_with_name (("ptrace"));
wptid = ptid_t (pid, pe.pe_tid, 0);
switch (pe.pe_report_event)
{
case PTRACE_FORK:
ourstatus->set_forked (ptid_t (pe.pe_other_pid));
/* Make sure the other end of the fork is stopped too. */
pid_t fpid = waitpid (pe.pe_other_pid, nullptr, 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 (find_inferior_pid (this, fpid) != nullptr)
{
ourstatus->set_forked (ptid_t (pe.pe_other_pid));
wptid = ptid_t (fpid, pe.pe_tid, 0);
}
obsd_enable_proc_events (ourstatus->child_ptid ().pid ());
break;
}
/* Ensure the ptid is updated with an LWP id on the first stop
of a process. */
if (!in_thread_list (this, wptid))
{
if (in_thread_list (this, ptid_t (pid)))
thread_change_ptid (this, ptid_t (pid), wptid);
else
add_thread (this, wptid);
}
}
return wptid;
}
void
obsd_nat_target::post_attach (int pid)
{
obsd_enable_proc_events (pid);
}
/* Implement the virtual inf_ptrace_target::post_startup_inferior method. */
void
obsd_nat_target::post_startup_inferior (ptid_t pid)
{
obsd_enable_proc_events (pid.pid ());
}
/* Target hook for follow_fork. */
void
obsd_nat_target::follow_fork (inferior *child_inf, ptid_t child_ptid,
target_waitkind fork_kind,
bool follow_child, bool detach_fork)
{
inf_ptrace_target::follow_fork (child_inf, child_ptid, fork_kind,
follow_child, detach_fork);
if (!follow_child && detach_fork)
{
/* Breakpoints have already been detached from the child by
infrun.c. */
if (ptrace (PT_DETACH, child_ptid.pid (), (PTRACE_TYPE_ARG3)1, 0) == -1)
perror_with_name (("ptrace"));
}
}
int
obsd_nat_target::insert_fork_catchpoint (int pid)
{
return 0;
}
int
obsd_nat_target::remove_fork_catchpoint (int pid)
{
return 0;
}
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