1 files changed, 13 insertions, 1 deletions

diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
index 00e9388e947a..0d2422a7d72c 100644
--- a/arch/um/os-Linux/sigio.c
+++ b/arch/um/os-Linux/sigio.c
@@ -233,7 +233,7 @@ static struct pollfd *setup_initial_poll(int fd)
         return p;
 }
 
-void write_sigio_workaround(void)
+static void write_sigio_workaround(void)
 {
         unsigned long stack;
         struct pollfd *p;
@@ -314,6 +314,18 @@ out_close1:
         close(l_write_sigio_fds[1]);
 }
 
+void maybe_sigio_broken(int fd, int read)
+{
+        if(!isatty(fd))
+                return;
+
+        if((read || pty_output_sigio) && (!read || pty_close_sigio))
+                return;
+
+        write_sigio_workaround();
+        add_sigio_fd(fd, read);
+}
+
 void sigio_cleanup(void)
 {
         if(write_sigio_pid != -1){