[PATCH] Don't compare the pid returned from wait() against inferior_ptid.

[John Baldwin <jhb@FreeBSD.org>]

inf_ptrace::wait() needs to discard termination events reported by
detached child processes.  Previously it compared the returned pid
against the pid in inferior_ptid to determine if a termination event
should be discarded or reported.  inferior_ptid is now null_ptid in
wait() target methods, so this was always failing and never reporting
exit events.  Instead, report termination events whose pid matches any
inferior belonging to the current target.

gdb/ChangeLog:

	* inf-ptrace.c (inf_ptrace_target::wait): Don't compare against
	inferior_ptid.
---
 gdb/ChangeLog    | 5 +++++
 gdb/inf-ptrace.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c86d7e4647..d4cd0d014e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-07-07  John Baldwin  <jhb@FreeBSD.org>
+
+	* inf-ptrace.c (inf_ptrace_target::wait): Don't compare against
+	inferior_ptid.
+
 2020-07-06  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	PR python/22748
diff --git a/gdb/inf-ptrace.c b/gdb/inf-ptrace.c
index d25d226abb..ae0b0f7ff0 100644
--- a/gdb/inf-ptrace.c
+++ b/gdb/inf-ptrace.c
@@ -347,7 +347,7 @@ inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
 	}
 
       /* Ignore terminated detached child processes.  */
-      if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ())
+      if (!WIFSTOPPED (status) && find_inferior_pid (this, pid) == nullptr)
 	pid = -1;
     }
   while (pid == -1);
-- 
2.25.1