(Fprocess_send_eof): Use shutdown, if it's a socket.

Don't close the output descriptor if that is also the input descriptor.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 4ad8fe24af5..bed3e381d5e 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3618,7 +3618,16 @@ text to PROCESS after you call this function.")
     send_process (proc, "\004", 1, Qnil);
   else
     {
-      close (XINT (XPROCESS (proc)->outfd));
+      /* If this is a network connection, or socketpair is used
+         for communication with the subprocess, call shutdown to cause EOF.
+         (In some old system, shutdown to socketpair doesn't work.
+         Then we just can't win.)  */
+      if (NILP (XPROCESS (proc)->pid)
+          || XINT (XPROCESS (proc)->outfd) == XINT (XPROCESS (proc)->infd))
+        shutdown (XINT (XPROCESS (proc)->outfd), 1);
+      /* In case of socketpair, outfd == infd, so don't close it.  */
+      if (XINT (XPROCESS (proc)->outfd) != XINT (XPROCESS (proc)->infd))
+        close (XINT (XPROCESS (proc)->outfd));
       XSETINT (XPROCESS (proc)->outfd, open (NULL_DEVICE, O_WRONLY));
     }
 #endif /* VMS */