gdb: Fix remote-sim/MinGW/Darwin builds

The recent commit e671cd59 ("Per-inferior target_terminal state, fix
PR gdb/13211, more") missed adjusting a few targets to the new
target_ops->to_interrupt interface, breaking the build for those
targets.  This fixes it.

Note: remote-sim doesn't really support async execution, so I don't
think gdbsim_interrupt is ever reached via target_interrupt.  (It is
reached via gdbsim_cntrl_c though).

The inflow.c changes are a bit ugly, but they're just doing what other
parts of the file already do to handle the same missing functions.
Targets that don't have 'kill', like mingw have their own
target_ops->to_interrupt implementation, so it's fine to make
child_interrupt be a nop.

gdb/ChangeLog:
2018-01-31  Pedro Alves  <palves@redhat.com>

	* darwin-nat.c (darwin_interrupt): Remove ptid_t parameter.
	* inflow.c (child_terminal_save_inferior): Wrap reference to
	tcgetpgrp in HAVE_TERMIOS_H.
	(child_interrupt, child_pass_ctrlc): Wrap references to signal in
	_WIN32.
	* remote-sim.c (gdbsim_interrupt): Remove ptid_t parameter and
	always iterate over all inferiors.
	(gdbsim_cntrl_c): Adjust.
	* windows-nat.c (windows_interrupt): Remove 'ptid_t' parameter.

1 files changed, 4 insertions, 19 deletions

diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index aed7a34..2f8fb68 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -86,7 +86,7 @@ static void gdbsim_files_info (struct target_ops *target);
 
 static void gdbsim_mourn_inferior (struct target_ops *target);
 
-static void gdbsim_interrupt (struct target_ops *self, ptid_t ptid);
+static void gdbsim_interrupt (struct target_ops *self);
 
 void simulator_command (char *args, int from_tty);
 
@@ -920,24 +920,9 @@ gdbsim_interrupt_inferior (struct inferior *inf, void *arg)
 }
 
 static void
-gdbsim_interrupt (struct target_ops *self, ptid_t ptid)
+gdbsim_interrupt (struct target_ops *self)
 {
-  struct sim_inferior_data *sim_data;
-
-  if (ptid_equal (ptid, minus_one_ptid))
-    {
-      iterate_over_inferiors (gdbsim_interrupt_inferior, NULL);
-    }
-  else
-    {
-      struct inferior *inf = find_inferior_ptid (ptid);
-
-      if (inf == NULL)
-	error (_("Can't stop pid %d.  No inferior found."),
-	       ptid_get_pid (ptid));
-
-      gdbsim_interrupt_inferior (inf, NULL);
-    }
+  iterate_over_inferiors (gdbsim_interrupt_inferior, NULL);
 }
 
 /* GDB version of os_poll_quit callback.
@@ -961,7 +946,7 @@ gdb_os_poll_quit (host_callback *p)
 static void
 gdbsim_cntrl_c (int signo)
 {
-  gdbsim_interrupt (NULL, minus_one_ptid);
+  gdbsim_interrupt (NULL);
 }
 
 static ptid_t