From 6584590b18b43595c1e27e46fee6bb1d4a498471 Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Thu, 25 Apr 1996 20:09:05 +0000
Subject: (pty_open_hook): Don't do increment of nptyperopens here.
 (pty_po_create_hook): Increment nptyperopens here, but only if this is for
 O_READ or O_WRITE. (pty_po_destroy_hook): Only do decrement if this was for
 O_READ or O_WRITE.

---
 term/ptyio.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/term/ptyio.c b/term/ptyio.c
index 36265f72..3ad8d55a 100644
--- a/term/ptyio.c
+++ b/term/ptyio.c
@@ -53,6 +53,31 @@ static int pktnostop = 0;
 static int ptyopen = 0;
 
 static int nptyperopens = 0;
+
+
+enum rb
+{
+  RB_OPEN = 1,
+  RB_BUSY = 2,
+  RB_INC = 3,
+  RB_CREATE = 4,
+  RB_DESTROY = 5,
+  RB_DEC = 6,
+  RB_DROP_CARR = 7,
+};
+
+static enum rb record_buf[10000];
+static enum rb *rbc = record_buf;
+static spin_lock_t rblock = SPIN_LOCK_INITIALIZER;
+static void
+xxx_record (enum rb n)
+{
+  spin_lock (&rblock);
+  *rbc++ = n;
+  spin_unlock (&rblock);
+}
+
+
 
 void
 ptyio_init ()
@@ -74,13 +99,13 @@ pty_open_hook (struct trivfs_control *cntl,
 
   if (ptyopen)
     {
+      xxx_record (RB_BUSY);
       mutex_unlock (&global_lock);
       return EBUSY;
     }
     
+  xxx_record (RB_OPEN);
   ptyopen = 1;
-  nptyperopens++;
-  report_carrier_on ();
   mutex_unlock (&global_lock);
   return 0;
 }
@@ -88,16 +113,33 @@ pty_open_hook (struct trivfs_control *cntl,
 error_t
 pty_po_create_hook (struct trivfs_peropen *po)
 {
+  xxx_record (RB_CREATE);
+  mutex_lock (&global_lock);
+  if (po->flags & (O_READ | O_WRITE))
+    {
+      xxx_record (RB_INC);
+      nptyperopens++;
+      report_carrier_on ();
+    }
+  mutex_unlock (&global_lock);
   return 0;
 }
 
 error_t
 pty_po_destroy_hook (struct trivfs_peropen *po)
 {
+  xxx_record (RB_DESTROY);
   mutex_lock (&global_lock);
+  if ((po->flags & (O_READ | O_WRITE)) == 0)
+    {
+      mutex_unlock (&global_lock);
+      return 0;
+    }
   nptyperopens--;
+  xxx_record (RB_DEC);
   if (!nptyperopens)
     {
+      xxx_record (RB_DROP_CARR);
       ptyopen = 0;
       report_carrier_off ();
     }
-- 
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