[PATCH] tests: vdsosyms call dwfl_linux_proc_attach.

[PATCH] tests: vdsosyms call dwfl_linux_proc_attach.

[Mark Wielaard]

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Older kernels won't let us get at the vdso otherwise.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
---
 tests/ChangeLog  | 4 ++++
 tests/vdsosyms.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/tests/ChangeLog b/tests/ChangeLog
index 909a61e..87a453d 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2014-11-27  Mark Wielaard  <mjw@redhat.com>
+
+	* vdsosyms.c (main): Call dwfl_linux_proc_attach.
+
 2014-11-21  Mark Wielaard  <mjw@redhat.com>
 
 	* run-readelf-A.sh: New test.
diff --git a/tests/vdsosyms.c b/tests/vdsosyms.c
index 831caf4..d04f36a 100644
--- a/tests/vdsosyms.c
+++ b/tests/vdsosyms.c
@@ -89,6 +89,13 @@ main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused)))
   else if (result > 0)
     error (2, result, "dwfl_linux_proc_report");
 
+  /* Also explicitly attach for older kernels (cannot read vdso otherwise).  */
+  result = dwfl_linux_proc_attach (dwfl, pid, false);
+  if (result < 0)
+    error (2, 0, "dwfl_linux_proc_attach: %s", dwfl_errmsg (-1));
+  else if (result > 0)
+    error (2, result, "dwfl_linux_proc_attach");
+
   if (dwfl_report_end (dwfl, NULL, NULL) != 0)
     error (2, 0, "dwfl_report_end: %s", dwfl_errmsg (-1));
 
-- 
1.9.3

Re: [PATCH] tests: vdsosyms call dwfl_linux_proc_attach.

[Mark Wielaard]

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On Thu, 2014-11-27 at 23:21 +0100, Mark Wielaard wrote:
> Older kernels won't let us get at the vdso otherwise.
> [...]
> +2014-11-27  Mark Wielaard  <mjw@redhat.com>
> +
> +	* vdsosyms.c (main): Call dwfl_linux_proc_attach.

I pushed this to master now.