1 files changed, 52 insertions, 4 deletions
diff --git a/erts/emulator/sys/unix/sys_uds.c b/erts/emulator/sys/unix/sys_uds.c
index dd0a3b03ff..c9f73622ba 100644
--- a/erts/emulator/sys/unix/sys_uds.c
+++ b/erts/emulator/sys/unix/sys_uds.c
@@ -1,7 +1,7 @@
 /*
  * %CopyrightBegin%
  * 
- * Copyright Ericsson AB 2002-2016. All Rights Reserved.
+ * Copyright Ericsson AB 2002-2018. All Rights Reserved.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,42 @@
  * %CopyrightEnd%
  */
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#if defined(__sun__) && !defined(_XOPEN_SOURCE)
+#define _XOPEN_SOURCE 500
+#endif
+
+#include <limits.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#ifdef HAVE_SYS_SOCKETIO_H
+#   include <sys/socketio.h>
+#endif
+#ifdef HAVE_SYS_SOCKIO_H
+#   include <sys/sockio.h>
+#endif
+
+#ifdef HAVE_NET_ERRNO_H
+#include <net/errno.h>
+#endif
+
+#ifdef HAVE_DIRENT_H
+#  include <dirent.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#   include <unistd.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
 #include "sys_uds.h"
 
 int
@@ -52,8 +88,9 @@ sys_uds_readv(int fd, struct iovec *iov, size_t iov_len,
     if((msg.msg_flags & MSG_CTRUNC) == MSG_CTRUNC)
     {
         /* We assume that we have given enough space for any header
-           that are sent to us. So the only remaining reason to get
-           this flag set is if the caller has run out of file descriptors.
+           that are sent to us. So the only remaining reasons to get
+           this flag set is if the caller has run out of file descriptors
+           or an SELinux policy prunes the response (eg. O_APPEND on STDERR).
         */
         errno = EMFILE;
         return -1;
@@ -96,7 +133,7 @@ sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
 
     struct msghdr msg;
     struct cmsghdr *cmsg = NULL;
-    int res, i;
+    int res, i, error;
 
     /* initialize socket message */
     memset(&msg, 0, sizeof(struct msghdr));
@@ -137,11 +174,22 @@ sys_uds_writev(int fd, struct iovec *iov, size_t iov_len,
 
     res = sendmsg(fd, &msg, flags);
 
+#ifdef ETOOMANYREFS
+    /* Linux may give ETOOMANYREFS when there are too many fds in transit.
+       We map this to EMFILE as bsd and other use this error code and we want
+       the behaviour to be the same on all OSs */
+    if (errno == ETOOMANYREFS)
+        errno = EMFILE;
+#endif
+    error = errno;
+
     if (iov_len > MAXIOV)
         free(iov[0].iov_base);
 
     free(msg.msg_control);
 
+    errno = error;
+
     return res;
 }