From 93692b589dc7017d5a2fbdffdfad5f84f597d8f1 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 12 Apr 2016 16:49:31 +0100 Subject: [PATCH] Pass Ctrl-C to the target in target_terminal_inferior If the user presses Ctrl-C immediately before target_terminal_inferior is called and the target is resumed, instead of after, the Ctrl-C ends up pending in the quit flag until the target next stops. remote.c has this bit to handle this: if (!target_is_async_p ()) { ofunc = signal (SIGINT, sync_remote_interrupt); /* If the user hit C-c before this packet, or between packets, pretend that it was hit right here. */ if (check_quit_flag ()) sync_remote_interrupt (SIGINT); } But that's only reachable if async is off, while async is on by default nowadays. It's also obviously not reacheable on native targets. This patch generalizes that to all targets. We can't remove that remote.c bit yet, until we get rid of the sync SIGINT handler though. That'll be done later in the series. gdb/ChangeLog: 2016-04-12 Pedro Alves * remote.c (remote_pass_ctrlc): New function. (init_remote_ops): Install it. * target.c (target_terminal_inferior): Pass pending Ctrl-C to the target. (target_pass_ctrlc, default_target_pass_ctrlc): New functions. * target.h (struct target_ops) : New method. (target_pass_ctrlc, default_target_pass_ctrlc): New declarations. * target-delegates.c: Regenerate. --- gdb/ChangeLog | 11 +++++++++++ gdb/remote.c | 22 ++++++++++++++++++++++ gdb/target-delegates.c | 21 +++++++++++++++++++++ gdb/target.c | 21 +++++++++++++++++++++ gdb/target.h | 13 +++++++++++++ 5 files changed, 88 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2a05df2152..ac6c2819df 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,14 @@ +2016-04-12 Pedro Alves + + * remote.c (remote_pass_ctrlc): New function. + (init_remote_ops): Install it. + * target.c (target_terminal_inferior): Pass pending Ctrl-C to the + target. + (target_pass_ctrlc, default_target_pass_ctrlc): New functions. + * target.h (struct target_ops) : New method. + (target_pass_ctrlc, default_target_pass_ctrlc): New declarations. + * target-delegates.c: Regenerate. + 2016-04-12 Pedro Alves * infcmd.c (interrupt_target_1): Call target_stop is in non-stop diff --git a/gdb/remote.c b/gdb/remote.c index 1bd2bcfe29..0b2d25fde3 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -5875,6 +5875,27 @@ remote_interrupt (struct target_ops *self, ptid_t ptid) remote_interrupt_as (); } +/* Implement the to_pass_ctrlc function for the remote targets. */ + +static void +remote_pass_ctrlc (struct target_ops *self) +{ + struct remote_state *rs = get_remote_state (); + + if (remote_debug) + fprintf_unfiltered (gdb_stdlog, "remote_pass_ctrlc called\n"); + + /* If we're starting up, we're not fully synced yet. Quit + immediately. */ + if (rs->starting_up) + quit (); + /* If ^C has already been sent once, offer to disconnect. */ + else if (rs->ctrlc_pending_p) + interrupt_query (); + else + target_interrupt (inferior_ptid); +} + /* Ask the user what to do when an interrupt is received. */ static void @@ -13056,6 +13077,7 @@ Specify the serial device it is connected to\n\ remote_ops.to_get_ada_task_ptid = remote_get_ada_task_ptid; remote_ops.to_stop = remote_stop; remote_ops.to_interrupt = remote_interrupt; + remote_ops.to_pass_ctrlc = remote_pass_ctrlc; remote_ops.to_check_pending_interrupt = remote_check_pending_interrupt; remote_ops.to_xfer_partial = remote_xfer_partial; remote_ops.to_rcmd = remote_rcmd; diff --git a/gdb/target-delegates.c b/gdb/target-delegates.c index d23bc759e5..640803a340 100644 --- a/gdb/target-delegates.c +++ b/gdb/target-delegates.c @@ -1607,6 +1607,23 @@ debug_interrupt (struct target_ops *self, ptid_t arg1) fputs_unfiltered (")\n", gdb_stdlog); } +static void +delegate_pass_ctrlc (struct target_ops *self) +{ + self = self->beneath; + self->to_pass_ctrlc (self); +} + +static void +debug_pass_ctrlc (struct target_ops *self) +{ + fprintf_unfiltered (gdb_stdlog, "-> %s->to_pass_ctrlc (...)\n", debug_target.to_shortname); + debug_target.to_pass_ctrlc (&debug_target); + fprintf_unfiltered (gdb_stdlog, "<- %s->to_pass_ctrlc (", debug_target.to_shortname); + target_debug_print_struct_target_ops_p (&debug_target); + fputs_unfiltered (")\n", gdb_stdlog); +} + static void delegate_check_pending_interrupt (struct target_ops *self) { @@ -4194,6 +4211,8 @@ install_delegators (struct target_ops *ops) ops->to_stop = delegate_stop; if (ops->to_interrupt == NULL) ops->to_interrupt = delegate_interrupt; + if (ops->to_pass_ctrlc == NULL) + ops->to_pass_ctrlc = delegate_pass_ctrlc; if (ops->to_check_pending_interrupt == NULL) ops->to_check_pending_interrupt = delegate_check_pending_interrupt; if (ops->to_rcmd == NULL) @@ -4442,6 +4461,7 @@ install_dummy_methods (struct target_ops *ops) ops->to_thread_name = tdefault_thread_name; ops->to_stop = tdefault_stop; ops->to_interrupt = tdefault_interrupt; + ops->to_pass_ctrlc = default_target_pass_ctrlc; ops->to_check_pending_interrupt = tdefault_check_pending_interrupt; ops->to_rcmd = default_rcmd; ops->to_pid_to_exec_file = tdefault_pid_to_exec_file; @@ -4598,6 +4618,7 @@ init_debug_target (struct target_ops *ops) ops->to_thread_name = debug_thread_name; ops->to_stop = debug_stop; ops->to_interrupt = debug_interrupt; + ops->to_pass_ctrlc = debug_pass_ctrlc; ops->to_check_pending_interrupt = debug_check_pending_interrupt; ops->to_rcmd = debug_rcmd; ops->to_pid_to_exec_file = debug_pid_to_exec_file; diff --git a/gdb/target.c b/gdb/target.c index ac66a3a899..d580983c4f 100644 --- a/gdb/target.c +++ b/gdb/target.c @@ -491,6 +491,11 @@ target_terminal_inferior (void) inferior's terminal modes. */ (*current_target.to_terminal_inferior) (¤t_target); terminal_state = terminal_is_inferior; + + /* If the user hit C-c before, pretend that it was hit right + here. */ + if (check_quit_flag ()) + target_pass_ctrlc (); } /* See target.h. */ @@ -3359,6 +3364,22 @@ target_interrupt (ptid_t ptid) /* See target.h. */ +void +target_pass_ctrlc (void) +{ + (*current_target.to_pass_ctrlc) (¤t_target); +} + +/* See target.h. */ + +void +default_target_pass_ctrlc (struct target_ops *ops) +{ + target_interrupt (inferior_ptid); +} + +/* See target.h. */ + void target_check_pending_interrupt (void) { diff --git a/gdb/target.h b/gdb/target.h index 26c857938e..00625fec63 100644 --- a/gdb/target.h +++ b/gdb/target.h @@ -645,6 +645,8 @@ struct target_ops TARGET_DEFAULT_IGNORE (); void (*to_interrupt) (struct target_ops *, ptid_t) TARGET_DEFAULT_IGNORE (); + void (*to_pass_ctrlc) (struct target_ops *) + TARGET_DEFAULT_FUNC (default_target_pass_ctrlc); void (*to_check_pending_interrupt) (struct target_ops *) TARGET_DEFAULT_IGNORE (); void (*to_rcmd) (struct target_ops *, @@ -1716,6 +1718,17 @@ extern void target_stop (ptid_t ptid); extern void target_interrupt (ptid_t ptid); +/* Pass a ^C, as determined to have been pressed by checking the quit + flag, to the target. Normally calls target_interrupt, but remote + targets may take the opportunity to detect the remote side is not + responding and offer to disconnect. */ + +extern void target_pass_ctrlc (void); + +/* The default target_ops::to_pass_ctrlc implementation. Simply calls + target_interrupt. */ +extern void default_target_pass_ctrlc (struct target_ops *ops); + /* Some targets install their own SIGINT handler while the target is running. This method is called from the QUIT macro to give such targets a chance to process a Ctrl-C. The target may e.g., choose -- 2.34.1