Warn when the plugin interface runs out of file descriptors.

	* plugin.c (bfd_plugin_open_input): Inform the user if the limit
	on the number of open files is reached.  If possible, try to
	increase this limit before failing.

2 files changed, 35 insertions, 1 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index b399aef..a389fdf 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2021-05-19  Nick Clifton  <nickc@redhat.com>
+
+	* plugin.c (bfd_plugin_open_input): Inform the user if the limit
+	on the number of open files is reached.  If possible, try to
+	increase this limit before failing.
+
 2021-05-14  Nelson Chu  <nelson.chu@sifive.com>
 
 	* elfnn-riscv.c (riscv_resolve_pcrel_lo_relocs): Check the values
diff --git a/bfd/plugin.c b/bfd/plugin.c
index c4f2be8..1fee4d0 100644
--- a/bfd/plugin.c
+++ b/bfd/plugin.c
@@ -209,7 +209,35 @@ bfd_plugin_open_input (bfd *ibfd, struct ld_plugin_input_file *file)
      the same underlying file descriptor.  */
   file->fd = open (file->name, O_RDONLY | O_BINARY);
   if (file->fd < 0)
-    return 0;
+    {
+#ifndef EMFILE
+      return 0;
+#else
+      if (errno != EMFILE)
+	return 0;
+
+#ifdef HAVE_GETRLIMIT
+      struct rlimit lim;
+
+      /* Complicated links involving lots of files and/or large archives
+	 can exhaust the number of file descriptors available to us.
+	 If possible, try to allocate more descriptors.  */
+      if (getrlimit (RLIMIT_NOFILE, & lim) == 0
+	  && lim.rlim_cur < lim.rlim_max)
+	{
+	  lim.rlim_cur = lim.rlim_max;
+	  if (setrlimit (RLIMIT_NOFILE, &lim) == 0)
+	    file->fd = open (file->name, O_RDONLY | O_BINARY);
+	}
+
+      if (file->fd < 0)
+#endif
+	{
+	  _bfd_error_handler (_("plugin framework: out of file descriptors. Try using fewer objects/archives\n"));
+	  return 0;
+	} 
+#endif
+   }
 
   if (iobfd == ibfd)
     {