Doc tweak.

[gnulib.git] / m4 / sigaction.m4

diff --git a/m4/sigaction.m4 b/m4/sigaction.m4
index 93306b8..f11d4cf 100644 (file)
--- a/m4/sigaction.m4
+++ b/m4/sigaction.m4
@@ -1,4 +1,4 @@
-# sigaction.m4 serial 2
+# sigaction.m4 serial 4
 dnl Copyright (C) 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,6 +22,7 @@ AC_DEFUN([gl_PREREQ_SIGACTION],
   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([AC_TYPE_UID_T])
+  AC_REQUIRE([gl_PREREQ_SIG_HANDLER_H])
   AC_CHECK_FUNCS_ONCE([sigaltstack siginterrupt])
   AC_CHECK_TYPES([siginfo_t], [], [], [[
 #include <signal.h>
@@ -30,5 +31,16 @@ AC_DEFUN([gl_PREREQ_SIGACTION],
     HAVE_SIGINFO_T=0
     AC_SUBST([HAVE_SIGINFO_T])
   fi
-  gl_PREREQ_SIG_HANDLER_H
+])
+
+# Prerequisites of lib/sig-handler.h.
+AC_DEFUN([gl_PREREQ_SIG_HANDLER_H],
+[
+  AC_REQUIRE([AC_C_INLINE])
+  AC_CHECK_MEMBERS([struct sigaction.sa_sigaction], , ,
+                   [[#include <signal.h>]])
+  if test $ac_cv_member_struct_sigaction_sa_sigaction = no; then
+    HAVE_STRUCT_SIGACTION_SA_SIGACTION=0
+    AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
+  fi
 ])