unsigned char
mywait (char *status)
{
int pid;
union wait w;
enable_async_io ();
pid = waitpid (inferior_pid, &w, 0);
disable_async_io ();
if (pid != inferior_pid)
perror_with_name ("wait");
if (WIFEXITED (w))
{
fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
*status = 'W';
return ((unsigned char) WEXITSTATUS (w));
}
else if (!WIFSTOPPED (w))
{
fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
*status = 'X';
return ((unsigned char) WTERMSIG (w));
}
fetch_inferior_registers (0);
*status = 'T';
return ((unsigned char) WSTOPSIG (w));
}
static void
fbsd_resume (struct thread_resume *resume_info)
{
int pending_flag;
/* Yes, the use of a global here is rather ugly. */
resume_ptr = resume_info;
for_each_inferior (&all_threads, fbsd_set_resume_request);
/* If there is a thread which would otherwise be resumed, which
has a pending status, then don't resume any threads - we can just
report the pending status. Make sure to queue any signals
that would otherwise be sent. */
pending_flag = 0;
find_inferior (&all_processes, resume_status_pending_p, &pending_flag);
if (debug_threads)
{
if (pending_flag)
fprintf (stderr, "Not resuming, pending status\n");
else
fprintf (stderr, "Resuming, no pending status\n");
}
if (pending_flag)
for_each_inferior (&all_threads, fbsd_queue_one_thread);
else
{
block_async_io ();
enable_async_io ();
for_each_inferior (&all_threads, fbsd_continue_one_thread);
}
}
void
myresume (char *own_buf, int step, int *signalp, char *statusp)
{
struct thread_resume resume_info[2];
int n = 0;
int sig = *signalp;
set_desired_inferior (0);
if (step || sig || (cont_thread != 0 && cont_thread != -1))
{
resume_info[0].thread
= ((struct inferior_list_entry *) current_inferior)->id;
resume_info[0].step = step;
resume_info[0].sig = sig;
resume_info[0].leave_stopped = 0;
n++;
}
resume_info[n].thread = -1;
resume_info[n].step = 0;
resume_info[n].sig = 0;
resume_info[n].leave_stopped = (cont_thread != 0 && cont_thread != -1);
enable_async_io ();
(*the_target->resume) (resume_info);
*signalp = mywait (statusp, 1);
prepare_resume_reply (own_buf, *statusp, *signalp);
disable_async_io ();
}
static unsigned char
fbsd_wait (char *status)
{
int w;
struct thread_info *child = NULL;
retry:
/* If we were only supposed to resume one thread, only wait for
that thread - if it's still alive. If it died, however - which
can happen if we're coming from the thread death case below -
then we need to make sure we restart the other threads. We could
pick a thread at random or restart all; restarting all is less
arbitrary. */
if (cont_thread > 0)
{
child = (struct thread_info *) find_inferior_id (&all_threads,
cont_thread);
/* No stepping, no signal - unless one is pending already, of course. */
if (child == NULL)
{
struct thread_resume resume_info;
resume_info.thread = -1;
resume_info.step = resume_info.sig = resume_info.leave_stopped = 0;
fbsd_resume (&resume_info);
}
}
enable_async_io ();
unblock_async_io ();
w = fbsd_wait_for_event (child);
stop_all_processes ();
disable_async_io ();
/* If we are waiting for a particular child, and it exited,
fbsd_wait_for_event will return its exit status. Similarly if
the last child exited. If this is not the last child, however,
do not report it as exited until there is a 'thread exited' response
available in the remote protocol. Instead, just wait for another event.
This should be safe, because if the thread crashed we will already
have reported the termination signal to GDB; that should stop any
in-progress stepping operations, etc.
Report the exit status of the last thread to exit. This matches
LinuxThreads' behavior. */
if (all_threads.head == all_threads.tail)
{
if (WIFEXITED (w))
{
fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
*status = 'W';
clear_inferiors ();
free (all_processes.head);
all_processes.head = all_processes.tail = NULL;
return ((unsigned char) WEXITSTATUS (w));
}
else if (!WIFSTOPPED (w))
{
fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
*status = 'X';
clear_inferiors ();
free (all_processes.head);
all_processes.head = all_processes.tail = NULL;
return ((unsigned char) WTERMSIG (w));
}
}
else
{
if (!WIFSTOPPED (w))
goto retry;
}
*status = 'T';
return ((unsigned char) WSTOPSIG (w));
}
/* Parse vCont packets. */
void
handle_v_cont (char *own_buf, char *status, int *signal)
{
char *p, *q;
int n = 0, i = 0;
struct thread_resume *resume_info, default_action;
/* Count the number of semicolons in the packet. There should be one
for every action. */
p = &own_buf[5];
while (p)
{
n++;
p++;
p = strchr (p, ';');
}
/* Allocate room for one extra action, for the default remain-stopped
behavior; if no default action is in the list, we'll need the extra
slot. */
resume_info = malloc ((n + 1) * sizeof (resume_info[0]));
default_action.thread = -1;
default_action.leave_stopped = 1;
default_action.step = 0;
default_action.sig = 0;
p = &own_buf[5];
i = 0;
while (*p)
{
p++;
resume_info[i].leave_stopped = 0;
if (p[0] == 's' || p[0] == 'S')
resume_info[i].step = 1;
else if (p[0] == 'c' || p[0] == 'C')
resume_info[i].step = 0;
else
goto err;
if (p[0] == 'S' || p[0] == 'C')
{
int sig;
sig = strtol (p + 1, &q, 16);
if (p == q)
goto err;
p = q;
if (!target_signal_to_host_p (sig))
goto err;
resume_info[i].sig = target_signal_to_host (sig);
}
else
{
resume_info[i].sig = 0;
p = p + 1;
}
if (p[0] == 0)
{
resume_info[i].thread = -1;
default_action = resume_info[i];
/* Note: we don't increment i here, we'll overwrite this entry
the next time through. */
}
else if (p[0] == ':')
{
unsigned int gdb_id = strtoul (p + 1, &q, 16);
unsigned long thread_id;
if (p == q)
goto err;
p = q;
if (p[0] != ';' && p[0] != 0)
goto err;
thread_id = gdb_id_to_thread_id (gdb_id);
if (thread_id)
resume_info[i].thread = thread_id;
else
goto err;
i++;
}
}
resume_info[i] = default_action;
/* Still used in occasional places in the backend. */
if (n == 1 && resume_info[0].thread != -1)
cont_thread = resume_info[0].thread;
else
cont_thread = -1;
set_desired_inferior (0);
enable_async_io ();
(*the_target->resume) (resume_info);
free (resume_info);
*signal = mywait (status, 1);
prepare_resume_reply (own_buf, *status, *signal);
disable_async_io ();
return;
err:
write_enn (own_buf);
free (resume_info);
return;
}
