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Re: [PATCH] support: Implement xdlmopen

* Gabriel F. T. Gomes:

> On Mon, Feb 04 2019, Florian Weimer wrote:
>> 	* support/xdlfcn.h (xdlmopen): Declare.
>> 	* support/xdlmopen.c: New file.
> Missing an entry for the change in support/Makefile.

Thanks, fixed.

>> +  /* Clear any errors.  */
>> +  dlerror ();
> Why is this needed?  If the call to dlmopen failed, dlerror is called
> from within the preceding FAIL_EXIT1 statement.  I didn't understand
> what other errors should be cleared here.

This came from xdlopen.  I fixed it with Paul's help in commit
3b935595859e0232b74594c5aca6da88a31f90b3.  The new version no longer has

>> +  return dso;
>> +}
>> +
> Probably not important, but `git am' complained about a "new blank line
> at EOF".  I suppose it's something wrong with my git configuration.  :(

That's a tooling bug on my end, it should detect spurious newlines at
the end of files, but currently does not.  I have removed it.  Updated
patch below.


support: Implement xdlmopen

Put xdlmopen into its own file, to avoid disturbing static linking
tests (where dlmopen pulls in additional code).

2019-02-03  Florian Weimer  <>

	* support/xdlfcn.h (xdlmopen): Declare.
	* support/xdlmopen.c: New file.
	* support/Makefile (libsupport-routines): Add xdlmopen.

diff --git a/support/Makefile b/support/Makefile
index 9ff0ec3fff..f173565202 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -81,6 +81,7 @@ libsupport-routines = \
   xconnect \
   xcopy_file_range \
   xdlfcn \
+  xdlmopen \
   xdup2 \
   xfclose \
   xfopen \
diff --git a/support/xdlfcn.h b/support/xdlfcn.h
index 559281fc74..c9cd810a8a 100644
--- a/support/xdlfcn.h
+++ b/support/xdlfcn.h
@@ -25,10 +25,10 @@ __BEGIN_DECLS
 /* Each of these terminates process on failure with relevant error message.  */
 void *xdlopen (const char *filename, int flags);
+void *xdlmopen (Lmid_t lmid, const char *filename, int flags);
 void *xdlsym (void *handle, const char *symbol);
 void xdlclose (void *handle);
 #endif /* SUPPORT_DLOPEN_H */
diff --git a/support/xdlmopen.c b/support/xdlmopen.c
new file mode 100644
index 0000000000..9a39ba8801
--- /dev/null
+++ b/support/xdlmopen.c
@@ -0,0 +1,31 @@
+/* dlmopen with error checking.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <>.  */
+#include <support/check.h>
+#include <support/xdlfcn.h>
+void *
+xdlmopen (Lmid_t lmid, const char *filename, int flags)
+  void *dso = dlmopen (lmid, filename, flags);
+  if (dso == NULL)
+    FAIL_EXIT1 ("error: dlmopen: %s\n", dlerror ());
+  return dso;

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