int *wstat, int options);
static int linux_wait_for_event (ptid_t ptid, int *wstat, int options);
static struct lwp_info *add_lwp (ptid_t ptid);
+static void linux_mourn (struct process_info *process);
static int linux_stopped_by_watchpoint (void);
static void mark_lwp_dead (struct lwp_info *lwp, int wstat);
static int lwp_is_marked_dead (struct lwp_info *lwp);
static CORE_ADDR get_pc (struct lwp_info *lwp);
-/* Handle a GNU/Linux extended wait response. If we see a clone
- event, we need to add the new LWP to our list (and return 0 so as
- not to report the trap to higher layers). */
+/* Implement the arch_setup target_ops method. */
+
+static void
+linux_arch_setup (void)
+{
+ the_low_target.arch_setup ();
+}
+
+/* Call the target arch_setup function on THREAD. */
+
+static void
+linux_arch_setup_thread (struct thread_info *thread)
+{
+ struct thread_info *saved_thread;
+
+ saved_thread = current_thread;
+ current_thread = thread;
+
+ linux_arch_setup ();
+
+ current_thread = saved_thread;
+}
+
+/* Handle a GNU/Linux extended wait response. If we see a clone,
+ fork, or vfork event, we need to add the new LWP to our list
+ (and return 0 so as not to report the trap to higher layers).
+ If we see an exec event, we will modify ORIG_EVENT_LWP to point
+ to a new LWP representing the new program. */
static int
-handle_extended_wait (struct lwp_info *event_lwp, int wstat)
+handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat)
{
+ struct lwp_info *event_lwp = *orig_event_lwp;
int event = linux_ptrace_get_extended_event (wstat);
struct thread_info *event_thr = get_lwp_thread (event_lwp);
struct lwp_info *new_lwp;
/* Report the event. */
return 0;
}
+ else if (event == PTRACE_EVENT_EXEC && report_exec_events)
+ {
+ struct process_info *proc;
+ ptid_t event_ptid;
+ pid_t event_pid;
+
+ if (debug_threads)
+ {
+ debug_printf ("HEW: Got exec event from LWP %ld\n",
+ lwpid_of (event_thr));
+ }
+
+ /* Get the event ptid. */
+ event_ptid = ptid_of (event_thr);
+ event_pid = ptid_get_pid (event_ptid);
+
+ /* Delete the execing process and all its threads. */
+ proc = get_thread_process (event_thr);
+ linux_mourn (proc);
+ current_thread = NULL;
+
+ /* Create a new process/lwp/thread. */
+ proc = linux_add_process (event_pid, 0);
+ event_lwp = add_lwp (event_ptid);
+ event_thr = get_lwp_thread (event_lwp);
+ gdb_assert (current_thread == event_thr);
+ linux_arch_setup_thread (event_thr);
+
+ /* Set the event status. */
+ event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD;
+ event_lwp->waitstatus.value.execd_pathname
+ = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr)));
+
+ /* Mark the exec status as pending. */
+ event_lwp->stopped = 1;
+ event_lwp->status_pending_p = 1;
+ event_lwp->status_pending = wstat;
+ event_thr->last_resume_kind = resume_continue;
+ event_thr->last_status.kind = TARGET_WAITKIND_IGNORE;
+
+ /* Report the event. */
+ *orig_event_lwp = event_lwp;
+ return 0;
+ }
internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event);
}
return pid;
}
-/* Implement the arch_setup target_ops method. */
-
-static void
-linux_arch_setup (void)
-{
- the_low_target.arch_setup ();
-}
-
/* Attach to an inferior process. Returns 0 on success, ERRNO on
error. */
leader_pid, leader_lp!= NULL, num_lwps (leader_pid),
linux_proc_pid_is_zombie (leader_pid));
- if (leader_lp != NULL
+ if (leader_lp != NULL && !leader_lp->stopped
/* Check if there are other threads in the group, as we may
have raced with the inferior simply exiting. */
&& !last_thread_of_process_p (leader_pid)
if (report_vfork_events)
options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE);
+ if (report_exec_events)
+ options |= PTRACE_O_TRACEEXEC;
+
return options;
}
child = find_lwp_pid (pid_to_ptid (lwpid));
+ /* Check for stop events reported by a process we didn't already
+ know about - anything not already in our LWP list.
+
+ If we're expecting to receive stopped processes after
+ fork, vfork, and clone events, then we'll just add the
+ new one to our list and go back to waiting for the event
+ to be reported - the stopped process might be returned
+ from waitpid before or after the event is.
+
+ But note the case of a non-leader thread exec'ing after the
+ leader having exited, and gone from our lists (because
+ check_zombie_leaders deleted it). The non-leader thread
+ changes its tid to the tgid. */
+
+ if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP
+ && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC)
+ {
+ ptid_t child_ptid;
+
+ /* A multi-thread exec after we had seen the leader exiting. */
+ if (debug_threads)
+ {
+ debug_printf ("LLW: Re-adding thread group leader LWP %d"
+ "after exec.\n", lwpid);
+ }
+
+ child_ptid = ptid_build (lwpid, lwpid, 0);
+ child = add_lwp (child_ptid);
+ child->stopped = 1;
+ current_thread = child->thread;
+ }
+
/* If we didn't find a process, one of two things presumably happened:
- A process we started and then detached from has exited. Ignore it.
- A process we are controlling has forked and the new child's stop
{
if (proc->attached)
{
- struct thread_info *saved_thread;
-
/* This needs to happen after we have attached to the
inferior and it is stopped for the first time, but
before we access any inferior registers. */
- saved_thread = current_thread;
- current_thread = thread;
-
- the_low_target.arch_setup ();
-
- current_thread = saved_thread;
+ linux_arch_setup_thread (thread);
}
else
{
&& linux_is_extended_waitstatus (wstat))
{
child->stop_pc = get_pc (child);
- if (handle_extended_wait (child, wstat))
+ if (handle_extended_wait (&child, wstat))
{
/* The event has been handled, so just return without
reporting it. */
- When a non-leader thread execs, that thread just vanishes
without reporting an exit (so we'd hang if we waited for it
explicitly in that case). The exec event is reported to
- the TGID pid (although we don't currently enable exec
- events). */
+ the TGID pid. */
errno = 0;
ret = my_waitpid (-1, wstatp, options | WNOHANG);
return linux_supports_tracefork ();
}
+/* Check if exec events are supported. */
+
+static int
+linux_supports_exec_events (void)
+{
+ return linux_supports_traceexec ();
+}
+
/* Callback for 'find_inferior'. Set the (possibly changed) ptrace
options for the specified lwp. */
linux_supports_multi_process,
linux_supports_fork_events,
linux_supports_vfork_events,
+ linux_supports_exec_events,
linux_handle_new_gdb_connection,
#ifdef USE_THREAD_DB
thread_db_handle_monitor_command,
projects / deliverable / binutils-gdb.git / blobdiff