Check and define sig_t if it's not in signals.h

configure

@@ -7788,6 +7788,44 @@ $as_echo "#define uint64_t unsigned long long" >>confdefs.h
   fi
 
 
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sig_t" >&5
+$as_echo_n "checking for sig_t... " >&6; }
+if ${ac_cv_type_sig_t+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+   ac_cv_type_sig_t=no
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef HAVE_SIGNAL_H
+    #  include <signal.h>
+    #endif
+
+int
+main ()
+{
+sig_t foo
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_type_sig_t=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_sig_t" >&5
+$as_echo "$ac_cv_type_sig_t" >&6; }
+
+  if test "$ac_cv_type_sig_t" != "yes"; then
+
+$as_echo "#define sig_t void(*sig_t)(int)" >>confdefs.h
+
+  fi
+
+
 ac_fn_c_check_type "$LINENO" "__uint128_t" "ac_cv_type___uint128_t" "$ac_includes_default"
 if test "x$ac_cv_type___uint128_t" = xyes; then :
 

configure.ac

@@ -1098,6 +1098,15 @@ FR_CHECK_TYPE_INCLUDE(
   uint64_t, unsigned long long, [uint64_t is required for larger counters]
 )
 
+FR_CHECK_TYPE_INCLUDE(
+  [
+    #ifdef HAVE_SIGNAL_H
+    #  include <signal.h>
+    #endif
+  ],
+  sig_t, void(*sig_t)(int), [signal action callback function]
+)
+
 dnl #
 dnl #  Check for __uint128_t (compiler builtin)
 dnl #

src/include/autoconf.h.in

@@ -541,6 +541,9 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #undef pid_t
 
+/* signal action callback function */
+#undef sig_t
+
 /* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t