gdb: make target_ops::follow_fork return void

I noticed that all implementations return false, so
target_ops::follow_fork doesn't really need to return a value.  Change
it to return void.

gdb/ChangeLog:

	* target.h (struct target_ops) <follow_fork>: Return void.
	(target_follow_fork): Likewise.
	* target.c (default_follow_fork): Likewise.
	(target_follow_fork): Likewise.
	* infrun.c (follow_fork_inferior): Adjust.
	* fbsd-nat.h (class fbsd_nat_target) <follow_fork>: Return void.
	* fbsd-nat.c (fbsd_nat_target:::follow_fork): Likewise.
	* linux-nat.h (class linux_nat_target) <follow_fork>: Likewise.
	* linux-nat.c (linux_nat_target::follow_fork): Return void.
	* obsd-nat.h (class obsd_nat_target) <follow_fork>: Return void.
	* obsd-nat.c (obsd_nat_target::follow_fork): Likewise.
	* remote.c (class remote_target) <follow_fork>: Likewise.
	(remote_target::follow_fork): Likewise.
	* target-delegates.c: Re-generate.

Change-Id: If908c2f68b29fa275be2b0b9deb41e4c6a1b7879

12 files changed, 44 insertions, 40 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e817ba6..332688c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,20 @@
+2021-04-07  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* target.h (struct target_ops) <follow_fork>: Return void.
+	(target_follow_fork): Likewise.
+	* target.c (default_follow_fork): Likewise.
+	(target_follow_fork): Likewise.
+	* infrun.c (follow_fork_inferior): Adjust.
+	* fbsd-nat.h (class fbsd_nat_target) <follow_fork>: Return void.
+	* fbsd-nat.c (fbsd_nat_target:::follow_fork): Likewise.
+	* linux-nat.h (class linux_nat_target) <follow_fork>: Likewise.
+	* linux-nat.c (linux_nat_target::follow_fork): Return void.
+	* obsd-nat.h (class obsd_nat_target) <follow_fork>: Return void.
+	* obsd-nat.c (obsd_nat_target::follow_fork): Likewise.
+	* remote.c (class remote_target) <follow_fork>: Likewise.
+	(remote_target::follow_fork): Likewise.
+	* target-delegates.c: Re-generate.
+
 2021-04-07  Weimin Pan  <weimin.pan@oracle.com>
 
 	* ctfread.c (fetch_tid_type): New function, use throughout file.
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 22bdd78..0f0822f 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1417,7 +1417,7 @@ fbsd_nat_target::supports_stopped_by_sw_breakpoint ()
 /* Target hook for follow_fork.  On entry and at return inferior_ptid is
    the ptid of the followed inferior.  */
 
-bool
+void
 fbsd_nat_target::follow_fork (bool follow_child, bool detach_fork)
 {
   if (!follow_child && detach_fork)
@@ -1460,8 +1460,6 @@ fbsd_nat_target::follow_fork (bool follow_child, bool detach_fork)
 	}
 #endif
     }
-
-  return false;
 }
 
 int
diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index edb05f8..772655d 100644
--- a/gdb/fbsd-nat.h
+++ b/gdb/fbsd-nat.h
@@ -80,7 +80,7 @@ public:
 #endif
 
 #ifdef TDP_RFPPWAIT
-  bool follow_fork (bool, bool) override;
+  void follow_fork (bool, bool) override;
 
   int insert_fork_catchpoint (int) override;
   int remove_fork_catchpoint (int) override;
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 6176fa9..2c31cf4 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -426,7 +426,7 @@ follow_fork_inferior (bool follow_child, bool detach_fork)
 Can not resume the parent process over vfork in the foreground while\n\
 holding the child stopped.  Try \"set detach-on-fork\" or \
 \"set schedule-multiple\".\n"));
-      return 1;
+      return true;
     }
 
   if (!follow_child)
@@ -662,7 +662,9 @@ holding the child stopped.  Try \"set detach-on-fork\" or \
       switch_to_thread (child_thr);
     }
 
-  return target_follow_fork (follow_child, detach_fork);
+  target_follow_fork (follow_child, detach_fork);
+
+  return false;
 }
 
 /* Tell the target to follow the fork we're stopped at.  Returns true
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index ccfd3c1..c45e335 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -446,7 +446,7 @@ typedef std::unique_ptr<struct lwp_info, lwp_deleter> lwp_info_up;
    ptid of the followed inferior.  At return, inferior_ptid will be
    unchanged.  */
 
-bool
+void
 linux_nat_target::follow_fork (bool follow_child, bool detach_fork)
 {
   if (!follow_child)
@@ -611,8 +611,6 @@ linux_nat_target::follow_fork (bool follow_child, bool detach_fork)
       /* Let the thread_db layer learn about this new process.  */
       check_for_thread_db ();
     }
-
-  return false;
 }
 
 
diff --git a/gdb/linux-nat.h b/gdb/linux-nat.h
index ff4d753..5426a5c 100644
--- a/gdb/linux-nat.h
+++ b/gdb/linux-nat.h
@@ -133,7 +133,7 @@ public:
 
   void post_attach (int) override;
 
-  bool follow_fork (bool, bool) override;
+  void follow_fork (bool, bool) override;
 
   std::vector<static_tracepoint_marker>
     static_tracepoint_markers_by_strid (const char *id) override;
diff --git a/gdb/obsd-nat.c b/gdb/obsd-nat.c
index bf1aa82..a8164dd 100644
--- a/gdb/obsd-nat.c
+++ b/gdb/obsd-nat.c
@@ -193,7 +193,7 @@ obsd_nat_target::post_startup_inferior (ptid_t pid)
 /* Target hook for follow_fork.  On entry and at return inferior_ptid is
    the ptid of the followed inferior.  */
 
-bool
+void
 obsd_nat_target::follow_fork (bool follow_child, bool detach_fork)
 {
   if (!follow_child)
@@ -207,8 +207,6 @@ obsd_nat_target::follow_fork (bool follow_child, bool detach_fork)
       if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
 	perror_with_name (("ptrace"));
     }
-
-  return false;
 }
 
 int
diff --git a/gdb/obsd-nat.h b/gdb/obsd-nat.h
index f66b817..60b078f 100644
--- a/gdb/obsd-nat.h
+++ b/gdb/obsd-nat.h
@@ -30,7 +30,7 @@ class obsd_nat_target : public inf_ptrace_target
   ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
 
 #ifdef PT_GET_PROCESS_STATE
-  bool follow_fork (bool, bool) override;
+  void follow_fork (bool, bool) override;
 
   int insert_fork_catchpoint (int) override;
 
diff --git a/gdb/remote.c b/gdb/remote.c
index fd0ad9c..7429e1a 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -682,7 +682,7 @@ public:
 
   const struct btrace_config *btrace_conf (const struct btrace_target_info *) override;
   bool augmented_libraries_svr4_read () override;
-  bool follow_fork (bool, bool) override;
+  void follow_fork (bool, bool) override;
   void follow_exec (struct inferior *, const char *) override;
   int insert_fork_catchpoint (int) override;
   int remove_fork_catchpoint (int) override;
@@ -5895,7 +5895,7 @@ extended_remote_target::detach (inferior *inf, int from_tty)
    it is named remote_follow_fork in anticipation of using it for the
    remote target as well.  */
 
-bool
+void
 remote_target::follow_fork (bool follow_child, bool detach_fork)
 {
   struct remote_state *rs = get_remote_state ();
@@ -5922,8 +5922,6 @@ remote_target::follow_fork (bool follow_child, bool detach_fork)
 	  remote_detach_pid (child_pid);
 	}
     }
-
-  return false;
 }
 
 /* Target follow-exec function for remote targets.  Save EXECD_PATHNAME
diff --git a/gdb/target-delegates.c b/gdb/target-delegates.c
index cc8c64a..ef8c94c 100644
--- a/gdb/target-delegates.c
+++ b/gdb/target-delegates.c
@@ -56,7 +56,7 @@ struct dummy_target : public target_ops
   int remove_fork_catchpoint (int arg0) override;
   int insert_vfork_catchpoint (int arg0) override;
   int remove_vfork_catchpoint (int arg0) override;
-  bool follow_fork (bool arg0, bool arg1) override;
+  void follow_fork (bool arg0, bool arg1) override;
   int insert_exec_catchpoint (int arg0) override;
   int remove_exec_catchpoint (int arg0) override;
   void follow_exec (struct inferior *arg0, const char *arg1) override;
@@ -231,7 +231,7 @@ struct debug_target : public target_ops
   int remove_fork_catchpoint (int arg0) override;
   int insert_vfork_catchpoint (int arg0) override;
   int remove_vfork_catchpoint (int arg0) override;
-  bool follow_fork (bool arg0, bool arg1) override;
+  void follow_fork (bool arg0, bool arg1) override;
   int insert_exec_catchpoint (int arg0) override;
   int remove_exec_catchpoint (int arg0) override;
   void follow_exec (struct inferior *arg0, const char *arg1) override;
@@ -1518,32 +1518,28 @@ debug_target::remove_vfork_catchpoint (int arg0)
   return result;
 }
 
-bool
+void
 target_ops::follow_fork (bool arg0, bool arg1)
 {
-  return this->beneath ()->follow_fork (arg0, arg1);
+  this->beneath ()->follow_fork (arg0, arg1);
 }
 
-bool
+void
 dummy_target::follow_fork (bool arg0, bool arg1)
 {
-  return default_follow_fork (this, arg0, arg1);
+  default_follow_fork (this, arg0, arg1);
 }
 
-bool
+void
 debug_target::follow_fork (bool arg0, bool arg1)
 {
-  bool result;
   fprintf_unfiltered (gdb_stdlog, "-> %s->follow_fork (...)\n", this->beneath ()->shortname ());
-  result = this->beneath ()->follow_fork (arg0, arg1);
+  this->beneath ()->follow_fork (arg0, arg1);
   fprintf_unfiltered (gdb_stdlog, "<- %s->follow_fork (", this->beneath ()->shortname ());
   target_debug_print_bool (arg0);
   fputs_unfiltered (", ", gdb_stdlog);
   target_debug_print_bool (arg1);
-  fputs_unfiltered (") = ", gdb_stdlog);
-  target_debug_print_bool (result);
-  fputs_unfiltered ("\n", gdb_stdlog);
-  return result;
+  fputs_unfiltered (")\n", gdb_stdlog);
 }
 
 int
diff --git a/gdb/target.c b/gdb/target.c
index 995e7ef..1f07414 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2699,7 +2699,7 @@ target_program_signals (gdb::array_view<const unsigned char> program_signals)
   current_inferior ()->top_target ()->program_signals (program_signals);
 }
 
-static bool
+static void
 default_follow_fork (struct target_ops *self, bool follow_child,
 		     bool detach_fork)
 {
@@ -2708,10 +2708,9 @@ default_follow_fork (struct target_ops *self, bool follow_child,
 		  _("could not find a target to follow fork"));
 }
 
-/* Look through the list of possible targets for a target that can
-   follow forks.  */
+/* See target.h.  */
 
-bool
+void
 target_follow_fork (bool follow_child, bool detach_fork)
 {
   target_ops *target = current_inferior ()->top_target ();
diff --git a/gdb/target.h b/gdb/target.h
index adae49d..48bf734 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -636,7 +636,7 @@ struct target_ops
       TARGET_DEFAULT_RETURN (1);
     virtual int remove_vfork_catchpoint (int)
       TARGET_DEFAULT_RETURN (1);
-    virtual bool follow_fork (bool, bool)
+    virtual void follow_fork (bool, bool)
       TARGET_DEFAULT_FUNC (default_follow_fork);
     virtual int insert_exec_catchpoint (int)
       TARGET_DEFAULT_RETURN (1);
@@ -1710,11 +1710,9 @@ extern int target_remove_vfork_catchpoint (int pid);
    the next resume in order to perform any bookkeeping and fiddling
    necessary to continue debugging either the parent or child, as
    requested, and releasing the other.  Information about the fork
-   or vfork event is available via get_last_target_status ().
-   This function returns true if the inferior should not be resumed
-   (i.e. there is another event pending).  */
+   or vfork event is available via get_last_target_status ().  */
 
-bool target_follow_fork (bool follow_child, bool detach_fork);
+void target_follow_fork (bool follow_child, bool detach_fork);
 
 /* Handle the target-specific bookkeeping required when the inferior
    makes an exec call.  INF is the exec'd inferior.  */