}
else
{
+ std::string reason
+ = linux_ptrace_attach_fail_reason_string (ptid, err);
+
warning (_("Cannot attach to lwp %d: %s"),
- lwpid,
- linux_ptrace_attach_fail_reason_string (ptid,
- err));
+ lwpid, reason.c_str ());
}
}
else
CATCH (ex, RETURN_MASK_ERROR)
{
pid_t pid = parse_pid_to_attach (args);
- struct buffer buffer;
- char *message, *buffer_s;
-
- message = xstrdup (ex.message);
- make_cleanup (xfree, message);
-
- buffer_init (&buffer);
- linux_ptrace_attach_fail_reason (pid, &buffer);
+ std::string reason = linux_ptrace_attach_fail_reason (pid);
- buffer_grow_str0 (&buffer, "");
- buffer_s = buffer_finish (&buffer);
- make_cleanup (xfree, buffer_s);
-
- if (*buffer_s != '\0')
- throw_error (ex.error, "warning: %s\n%s", buffer_s, message);
+ if (!reason.empty ())
+ throw_error (ex.error, "warning: %s\n%s", reason.c_str (), ex.message);
else
- throw_error (ex.error, "%s", message);
+ throw_error (ex.error, "%s", ex.message);
}
END_CATCH
}
static void
-linux_nat_detach (struct target_ops *ops, const char *args, int from_tty)
+linux_nat_detach (struct target_ops *ops, inferior *inf, int from_tty)
{
- int pid;
struct lwp_info *main_lwp;
-
- pid = ptid_get_pid (inferior_ptid);
+ int pid = inf->pid;
/* Don't unregister from the event loop, as there may be other
inferiors running. */
iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL);
/* Only the initial process should be left right now. */
- gdb_assert (num_lwps (ptid_get_pid (inferior_ptid)) == 1);
+ gdb_assert (num_lwps (pid) == 1);
main_lwp = find_lwp_pid (pid_to_ptid (pid));
from, but there are other viable forks to debug. Detach from
the current fork, and context-switch to the first
available. */
- linux_fork_detach (args, from_tty);
+ linux_fork_detach (from_tty);
}
else
{
- int signo;
-
target_announce_detach (from_tty);
- /* Pass on any pending signal for the last LWP, unless the user
- requested detaching with a different signal (most likely 0,
- meaning, discard the signal). */
- if (args != NULL)
- signo = atoi (args);
- else
- signo = get_detach_signal (main_lwp);
+ /* Pass on any pending signal for the last LWP. */
+ int signo = get_detach_signal (main_lwp);
detach_one_lwp (main_lwp, &signo);
- inf_ptrace_detach_success (ops);
+ inf_ptrace_detach_success (ops, inf);
}
}
_("unknown ptrace event %d"), event);
}
+/* Suspend waiting for a signal. We're mostly interested in
+ SIGCHLD/SIGINT. */
+
+static void
+wait_for_signal ()
+{
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "linux-nat: about to sigsuspend\n");
+ sigsuspend (&suspend_mask);
+
+ /* If the quit flag is set, it means that the user pressed Ctrl-C
+ and we're debugging a process that is running on a separate
+ terminal, so we must forward the Ctrl-C to the inferior. (If the
+ inferior is sharing GDB's terminal, then the Ctrl-C reaches the
+ inferior directly.) We must do this here because functions that
+ need to block waiting for a signal loop forever until there's an
+ event to report before returning back to the event loop. */
+ if (!target_terminal::is_ours ())
+ {
+ if (check_quit_flag ())
+ target_pass_ctrlc ();
+ }
+}
+
/* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
exited. */
linux_nat_wait_1 and there if we get called my_waitpid gets called
again before it gets to sigsuspend so we can safely let the handlers
get executed here. */
-
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog, "WL: about to sigsuspend\n");
- sigsuspend (&suspend_mask);
+ wait_for_signal ();
}
restore_child_signals_mask (&prev_mask);
gdb_assert (lp == NULL);
/* Block until we get an event reported with SIGCHLD. */
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog, "LNW: about to sigsuspend\n");
- sigsuspend (&suspend_mask);
+ wait_for_signal ();
}
gdb_assert (lp);
#endif
}
-static int async_terminal_is_ours = 1;
-
-/* target_terminal_inferior implementation.
-
- This is a wrapper around child_terminal_inferior to add async support. */
-
-static void
-linux_nat_terminal_inferior (struct target_ops *self)
-{
- child_terminal_inferior (self);
-
- /* Calls to target_terminal_*() are meant to be idempotent. */
- if (!async_terminal_is_ours)
- return;
-
- async_terminal_is_ours = 0;
- set_sigint_trap ();
-}
-
-/* target_terminal::ours implementation.
-
- This is a wrapper around child_terminal_ours to add async support (and
- implement the target_terminal::ours vs target_terminal::ours_for_output
- distinction). child_terminal_ours is currently no different than
- child_terminal_ours_for_output.
- We leave target_terminal::ours_for_output alone, leaving it to
- child_terminal_ours_for_output. */
-
-static void
-linux_nat_terminal_ours (struct target_ops *self)
-{
- /* GDB should never give the terminal to the inferior if the
- inferior is running in the background (run&, continue&, etc.),
- but claiming it sure should. */
- child_terminal_ours (self);
-
- if (async_terminal_is_ours)
- return;
-
- clear_sigint_trap ();
- async_terminal_is_ours = 1;
-}
-
/* SIGCHLD handler that serves two purposes: In non-stop/async mode,
so we notice when any child changes state, and notify the
event-loop; it allows us to use sigsuspend in linux_nat_wait_1
t->to_supports_non_stop = linux_nat_supports_non_stop;
t->to_always_non_stop_p = linux_nat_always_non_stop_p;
t->to_async = linux_nat_async;
- t->to_terminal_inferior = linux_nat_terminal_inferior;
- t->to_terminal_ours = linux_nat_terminal_ours;
super_close = t->to_close;
t->to_close = linux_nat_close;
projects / deliverable / binutils-gdb.git / blobdiff