check for sigaction via configure; assume signal always available

configure

@@ -28217,6 +28217,20 @@ printf "%s\n" "#define IPOPT_HAS_FEENABLEEXCEPT 1" >>confdefs.h
 
 fi
 
+#############
+# sigaction #
+#############
+
+as_ac_Symbol=`printf "%s\n" "ac_cv_have_decl_sigaction(int, const struct sigaction*, struct sigaction*)" | sed "$as_sed_sh"`
+ac_fn_check_decl "$LINENO" "sigaction(int, const struct sigaction*, struct sigaction*)" "$as_ac_Symbol" "#include <csignal>
+" "$ac_cxx_undeclared_builtin_options" "CXXFLAGS"
+if eval test \"x\$"$as_ac_Symbol"\" = x"yes"
+then :
+
+printf "%s\n" "#define IPOPT_HAS_SIGACTION 1" >>confdefs.h
+
+fi
+
 ###################################################
 # Check if user wants inexact algorithm available #
 ###################################################
@@ -28398,7 +28412,7 @@ else case e in #(
 JAVA_TEST=Test.java
 CLASS_TEST=Test.class
 cat << \EOF > $JAVA_TEST
-/* #line 28401 "configure" */
+/* #line 28415 "configure" */
 public class Test {
 }
 EOF

configure.ac

@@ -336,6 +336,14 @@ AC_CHECK_DECL([feenableexcept],
   [AC_DEFINE([IPOPT_HAS_FEENABLEEXCEPT],[1],[Define to 1 if function feenableexcept is available])],,
   [#include <cfenv>])
 
+#############
+# sigaction #
+#############
+
+AC_CHECK_DECL([sigaction(int, const struct sigaction*, struct sigaction*)],
+  [AC_DEFINE([IPOPT_HAS_SIGACTION],[1],[Define to 1 if function sigaction is available])],,
+  [#include <csignal>])
+
 ###################################################
 # Check if user wants inexact algorithm available #
 ###################################################

src/Common/IpUtils.cpp

@@ -231,7 +231,7 @@ bool RegisterInterruptHandler(
    handle_interrupt_ = handle_interrupt;
    interrupt_flag_ = interrupt_flag;
 
-#ifdef _POSIX_C_SOURCE
+#ifdef IPOPT_HAS_SIGACTION
    struct sigaction sa;
    sa.sa_handler = &sighandler;
    sa.sa_flags = SA_RESTART;
@@ -245,13 +245,11 @@ bool RegisterInterruptHandler(
       return false;
    }
 
-#elif defined(_WIN32)
+#else
    signal(SIGINT, sighandler);
    signal(SIGTERM, sighandler);
    signal(SIGABRT, sighandler);
 
-#else
-   return false;
 #endif
 
    return true;
@@ -264,7 +262,7 @@ bool UnregisterInterruptHandler(void)
       return false;
    }
 
-#ifdef _POSIX_C_SOURCE
+#ifdef IPOPT_HAS_SIGACTION
    struct sigaction sa;
    sa.sa_handler = SIG_DFL;
    sa.sa_flags = SA_RESTART;
@@ -278,13 +276,11 @@ bool UnregisterInterruptHandler(void)
       return false;
    }
 
-#elif defined(_WIN32)
+#else
    signal(SIGINT, SIG_DFL);
    signal(SIGTERM, SIG_DFL);
    signal(SIGABRT, SIG_DFL);
 
-#else
-   return false;
 #endif
 
    registered_handler = false;

src/Common/config.h.in

@@ -126,6 +126,9 @@
 /* Define to 1 if function rand is available */
 #undef IPOPT_HAS_RAND
 
+/* Define to 1 if function sigaction is available */
+#undef IPOPT_HAS_SIGACTION
+
 /* Define to 1 if the Spral package is available */
 #undef IPOPT_HAS_SPRAL