r15424: Implement a "stacktrace" smbcontrol option using libunwind's remote

stack tracing support. This provides an easy way for users to provide
stack traces (hopefully it will be implemented on something other than
ia64).
(This used to be commit 0b5e07e12daa98095dae27e0a6d53fe8ec3f3700)

1 files changed, 49 insertions, 0 deletions

diff --git a/source3/configure.in b/source3/configure.in
index bb4cf82f35..fc5bad6dab 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -1280,12 +1280,61 @@ AC_TRY_LINK(
     [
 	AC_MSG_RESULT(yes)
 	AC_DEFINE(HAVE_LIBUNWIND, 1, [Whether libunwind is available])
+
+	# If we have libunwind, test whether we also have libunwind-ptrace
+	# which would let us unwind arbitrary processes.
+	save_LIBS=$LIBS
+	AC_CHECK_HEADERS(libunwind-ptrace.h)
+	AC_CHECK_LIB(unwind-ptrace, _UPT_create,
+	    [
+		LIBUNWIND_PTRACE="-lunwind-ptrace";
+		AC_DEFINE(HAVE_LIBUNWIND_PTRACE, 1,
+		    [Whether libunwind-ptrace.a is available.])
+	    ],
+	    [ LIBUNWIND_PTRACE="" ])
+
+	LIBS=$save_LIBS
     ],
     [
 	AC_MSG_RESULT(no)
 	LIBS=$save_LIBS
     ])
 
+# To use libunwind-ptrace, we also need to make some ptrace system calls.
+if test x"$LIBUNWIND_PTRACE" != x"" ; then
+    AC_CHECK_HEADERS(sys/ptrace.h)
+    AC_MSG_CHECKING([for the Linux ptrace(2) interface])
+    AC_TRY_LINK(
+	    [
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#if HAVE_SYS_PTRACE_H
+#include <sys/ptrace.h>
+#endif
+	    ],
+	    [
+		int main(int argc, const char ** argv)
+		{
+			pid_t me = (pid_t)-1;
+			ptrace(PTRACE_ATTACH, me, 0, 0);
+			ptrace(PTRACE_DETACH, me, 0, 0);
+			return 0;
+		}
+	    ],
+	    [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_LINUX_PTRACE, 1,
+		    [Whether the Linux ptrace(2) interface is available.])
+	    ],
+	    [
+		AC_MSG_RESULT(no)
+		LIBUNWIND_PTRACE=""
+	    ])
+fi
+
+AC_SUBST(LIBUNWIND_PTRACE)
+
 # syscall() is needed for smbwrapper.
 AC_CHECK_FUNCS(syscall)