Centralize the handling of attach permissions on linux in tests

Summary:
On linux we need the process to give us special permissions before we can attach to it.
Previously, the code for this was copied into every file that needed it. This moves the code to a
central place to reduce code duplication.

Reviewers: clayborg

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D15992

llvm-svn: 257319

1 files changed, 25 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/make/test_common.h b/lldb/packages/Python/lldbsuite/test/make/test_common.h
index 6f819706366..39b85322bf0 100644
--- a/lldb/packages/Python/lldbsuite/test/make/test_common.h
+++ b/lldb/packages/Python/lldbsuite/test/make/test_common.h
@@ -17,3 +17,28 @@
 // declared.  This may not be necessary after MSVC 12.

 #include <eh.h>

 #endif

+

+

+// On some systems (e.g., some versions of linux) it is not possible to attach to a process

+// without it giving us special permissions. This defines the lldb_enable_attach macro, which

+// should perform any such actions, if needed by the platform. This is a macro instead of a

+// function to avoid the need for complex linking of the test programs.

+#if defined(__linux__)

+#include <sys/prctl.h>

+

+#if defined(PR_SET_PTRACER) && defined(PR_SET_PTRACER_ANY)

+// For now we execute on best effort basis.  If this fails for some reason, so be it.

+#define lldb_enable_attach()                                                          \

+    do                                                                                \

+    {                                                                                 \

+        const int prctl_result = prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);  \

+        (void)prctl_result;                                                           \

+    } while (0)

+

+#endif

+

+#else // not linux

+

+#define lldb_enable_attach()

+

+#endif