Add netbsd_nat::enable_proc_events in gdb/nat

Add generic function to enable debugger events in a process.

gdb/ChangeLog:

        * netbsd-nat.h (netbsd_nat::enable_proc_events): Add.
	* netbsd-nat.c: Include <sys/ptrace.h>.
	* (netbsd_nat::enable_proc_events): Add.

2 files changed, 25 insertions, 0 deletions

diff --git a/gdb/nat/netbsd-nat.c b/gdb/nat/netbsd-nat.c
index 3f8b8b8..d805b89 100644
--- a/gdb/nat/netbsd-nat.c
+++ b/gdb/nat/netbsd-nat.c
@@ -22,6 +22,7 @@
 #include "gdbsupport/common-debug.h"
 
 #include <sys/types.h>
+#include <sys/ptrace.h>
 #include <sys/sysctl.h>
 
 #include <cstring>
@@ -163,4 +164,21 @@ for_each_thread (pid_t pid, gdb::function_view<void (ptid_t)> callback)
   netbsd_thread_lister (pid, fn);
 }
 
+/* See netbsd-nat.h.  */
+
+void
+enable_proc_events (pid_t pid)
+{
+  int events;
+
+  if (ptrace (PT_GET_EVENT_MASK, pid, &events, sizeof (events)) == -1)
+    perror_with_name (("ptrace"));
+
+  events |= PTRACE_LWP_CREATE;
+  events |= PTRACE_LWP_EXIT;
+
+  if (ptrace (PT_SET_EVENT_MASK, pid, &events, sizeof (events)) == -1)
+    perror_with_name (("ptrace"));
+}
+
 }
diff --git a/gdb/nat/netbsd-nat.h b/gdb/nat/netbsd-nat.h
index 3f2650f..6472cc5 100644
--- a/gdb/nat/netbsd-nat.h
+++ b/gdb/nat/netbsd-nat.h
@@ -50,6 +50,13 @@ extern const char *thread_name (ptid_t ptid);
 
 extern void for_each_thread (pid_t pid,
 			     gdb::function_view<void (ptid_t)> callback);
+
+/* Enable additional event reporting in a new process specified by PID.
+
+   This function assumes internally that the queried process is stopped and
+   traced.  */
+
+extern void enable_proc_events (pid_t pid);
 }
 
 #endif