[pushed 2/2] linux-procfs: Handle lowercase "t (tracing stop)" state

[Pedro Alves <palves@redhat.com>]

Since Linux 2.6.33, /proc/PID/status shows "t (tracing stop)", with
lowercase 't'.  Because GDB is only expecting "T (tracing stop)", GDB
can incorrectly suppress errors in check_ptrace_stopped_lwp_gone:

 1578          if (!check_ptrace_stopped_lwp_gone (lp))
 1579            throw_exception (ex);

Ref: https://sourceware.org/ml/gdb-patches/2016-06/msg00072.html

2016-07-25  Pedro Alves  <palves@redhat.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	* nat/linux-procfs.c (parse_proc_status_state): Handle lowercase
	't'.
---
 gdb/ChangeLog          | 6 ++++++
 gdb/nat/linux-procfs.c | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0840a69..c346a90 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,4 +1,10 @@
 2016-07-25  Pedro Alves  <palves@redhat.com>
+	    Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* nat/linux-procfs.c (parse_proc_status_state): Handle lowercase
+	't'.
+
+2016-07-25  Pedro Alves  <palves@redhat.com>
 
 	* nat/linux-procfs.c (enum proc_state): New enum.
 	(parse_proc_status_state): New function.
diff --git a/gdb/nat/linux-procfs.c b/gdb/nat/linux-procfs.c
index 5d63e1b..f00fe29 100644
--- a/gdb/nat/linux-procfs.c
+++ b/gdb/nat/linux-procfs.c
@@ -102,7 +102,10 @@ parse_proc_status_state (const char *state)
 
   switch (state[0])
     {
+    case 't':
+      return PROC_STATE_TRACING_STOP;
     case 'T':
+      /* Before Linux 2.6.33, tracing stop used uppercase T.  */
       if (strcmp (state, "T (tracing stop)") == 0)
 	return PROC_STATE_TRACING_STOP;
       else
-- 
2.5.5