- Warning was valid - possible race condition on PTYs. Avoided using

   platform-specific code.
 - Document some common problems

1 files changed, 21 insertions, 2 deletions

diff --git a/configure.in b/configure.in
index 1cb46525c..e5bdc445c 100644
--- a/configure.in
+++ b/configure.in
@@ -55,6 +55,7 @@ case "$host" in
         ;;
 *-*-linux*)
         no_dev_ptmx=1
+        need_pty_removed_on_close=1
         ;;
 *-*-netbsd*)
         need_dash_r=1
@@ -518,9 +519,27 @@ if test ! -z "$nolastlog" ; then
 fi
 
 if test -z "$no_dev_ptmx" ; then
-        AC_CHECK_FILE("/dev/ptmx", AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX))
+        AC_CHECK_FILE("/dev/ptmx", 
+                [
+                        AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX)
+                        have_dev_ptmx=1
+                ]
+        )
+fi
+AC_CHECK_FILE("/dev/ptc", 
+        [
+                AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC)
+                have_dev_ptc=1
+        ]
+)
+
+# Some systems (defined in platform-specific code above) automagically remove
+# Unix98 ptys when they are closed
+if test "x$ac_cv_func_openpty" = "xyes" -o "x$have_dev_ptmx" = "x1" -o "x$have_dev_ptc" = "x1" ; then
+        if test "x$need_pty_removed_on_close" = "x1" ; then
+                AC_DEFINE(PTY_REMOVED_ON_CLOSE)
+        fi
 fi
-AC_CHECK_FILE("/dev/ptc", AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC))
 
 # Options from here on. Some of these are preset by platform above