* src/process.c (wait_reading_process_output): Handle pty disconnect

by refraining from sending oneself a SIGCHLD.

Fixes: debbugs:10933

1 files changed, 12 insertions, 7 deletions

diff --git a/src/process.c b/src/process.c
index bdf16b7dbd2..f2f33a9eafc 100644
--- a/src/process.c
+++ b/src/process.c
@@ -4888,15 +4888,20 @@ wait_reading_process_output (int time_limit, int microsecs, int read_kbd,
                  It can't hurt.  */
               else if (nread == -1 && errno == EIO)
                 {
-                  /* Clear the descriptor now, so we only raise the signal once.  */
-                  FD_CLR (channel, &input_wait_mask);
-                  FD_CLR (channel, &non_keyboard_wait_mask);
-
-                  kill (getpid (), SIGCHLD);
+                  /* Don't do anything if only a pty, with no associated
+                     process (bug#10933).  */
+                  if (XPROCESS (proc)->pid != -2) {
+                    /* Clear the descriptor now, so we only raise the signal
+                       once.  */
+                    FD_CLR (channel, &input_wait_mask);
+                    FD_CLR (channel, &non_keyboard_wait_mask);
+                    
+                    kill (getpid (), SIGCHLD);
+                  }
                 }
 #endif /* HAVE_PTYS */
-              /* If we can detect process termination, don't consider the process
-                 gone just because its pipe is closed.  */
+              /* If we can detect process termination, don't consider the
+                 process gone just because its pipe is closed.  */
 #ifdef SIGCHLD
               else if (nread == 0 && !NETCONN_P (proc) && !SERIALCONN_P (proc))
                 ;