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Revision: 745
          http://pure-lang.svn.sourceforge.net/pure-lang/?rev=745&view=rev
Author:   agraef
Date:     2008-09-08 14:25:33 +0000 (Mon, 08 Sep 2008)

Log Message:
-----------
Add checks for signal functions (requires reconfigure).

Modified Paths:
--------------
    pure/trunk/config/aclocal.m4
    pure/trunk/config.h.in
    pure/trunk/configure
    pure/trunk/configure.ac

Modified: pure/trunk/config/aclocal.m4
===================================================================

--- pure/trunk/config/aclocal.m4	2008-09-08 14:24:48 UTC (rev 744)
+++ pure/trunk/config/aclocal.m4	2008-09-08 14:25:33 UTC (rev 745)
@@ -82,3 +82,105 @@
       [Define if you have <langinfo.h> and nl_langinfo(CODESET).])
   fi
 ])
+
+dnl Check type of signal routines (posix, 4.2bsd, 4.1bsd or v7).
+
+AC_DEFUN([AC_SIGNAL_CHECK],
+[AC_REQUIRE([AC_TYPE_SIGNAL])
+AC_MSG_CHECKING(for type of signal functions)
+AC_CACHE_VAL(q_cv_signal_vintage,
+[
+  AC_TRY_LINK([#include <signal.h>],[
+    sigset_t ss;
+    struct sigaction sa;
+    sigemptyset(&ss); sigsuspend(&ss);
+    sigaction(SIGINT, &sa, (struct sigaction *) 0);
+    sigprocmask(SIG_BLOCK, &ss, (sigset_t *) 0);
+  ], q_cv_signal_vintage=posix,
+  [
+    AC_TRY_LINK([#include <signal.h>], [
+	int mask = sigmask(SIGINT);
+	sigsetmask(mask); sigblock(mask); sigpause(mask);
+    ], q_cv_signal_vintage=4.2bsd,
+    [
+      AC_TRY_LINK([
+	#include <signal.h>
+	RETSIGTYPE foo() { }], [
+		int mask = sigmask(SIGINT);
+		sigset(SIGINT, foo); sigrelse(SIGINT);
+		sighold(SIGINT); sigpause(SIGINT);
+        ], q_cv_signal_vintage=svr3, q_cv_signal_vintage=v7
+    )]
+  )]
+)
+])
+AC_MSG_RESULT($q_cv_signal_vintage)
+if test "$q_cv_signal_vintage" = posix; then
+AC_DEFINE(HAVE_POSIX_SIGNALS, 1, [Define if POSIX signal functions are available.])
+elif test "$q_cv_signal_vintage" = "4.2bsd"; then
+AC_DEFINE(HAVE_BSD_SIGNALS, 1, [Define if BSD signal functions are available.])
+elif test "$q_cv_signal_vintage" = svr3; then
+AC_DEFINE(HAVE_USG_SIGHOLD, 1, [Define if SVR3 signal functions are available.])
+fi
+])
+
+dnl Check whether signal handlers must be reinstalled when invoked.
+
+AC_DEFUN([AC_REINSTALL_SIGHANDLERS],
+[AC_REQUIRE([AC_TYPE_SIGNAL])
+AC_REQUIRE([AC_SIGNAL_CHECK])
+AC_MSG_CHECKING([if signal handlers must be reinstalled when invoked])
+AC_CACHE_VAL(q_cv_must_reinstall_sighandlers,
+[AC_TRY_RUN([
+#include <signal.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+typedef RETSIGTYPE sigfunc();
+int nsigint;
+#ifdef HAVE_POSIX_SIGNALS
+sigfunc *
+set_signal_handler(sig, handler)
+     int sig;
+     sigfunc *handler;
+{
+  struct sigaction act, oact;
+  act.sa_handler = handler;
+  act.sa_flags = 0;
+  sigemptyset (&act.sa_mask);
+  sigemptyset (&oact.sa_mask);
+  sigaction (sig, &act, &oact);
+  return (oact.sa_handler);
+}
+#else
+#define set_signal_handler(s, h) signal(s, h)
+#endif
+RETSIGTYPE
+sigint(s)
+    int s;
+{
+  nsigint++;
+}
+main()
+{
+  nsigint = 0;
+  set_signal_handler(SIGINT, sigint);
+  kill((int)getpid(), SIGINT);
+  kill((int)getpid(), SIGINT);
+  exit(nsigint != 2);
+}
+], q_cv_must_reinstall_sighandlers=no, q_cv_must_reinstall_sighandlers=yes,
+if test "$q_cv_signal_vintage" = svr3; then
+  q_cv_must_reinstall_sighandlers=yes
+else
+  q_cv_must_reinstall_sighandlers=no
+fi)])
+if test "$cross_compiling" = yes; then
+  AC_MSG_RESULT([$q_cv_must_reinstall_sighandlers assumed for cross compilation])
+else
+  AC_MSG_RESULT($q_cv_must_reinstall_sighandlers)
+fi
+if test "$q_cv_must_reinstall_sighandlers" = yes; then
+  AC_DEFINE(MUST_REINSTALL_SIGHANDLERS, 1, [Define if signal handlers must be reinstalled by handler.])
+fi
+])

Modified: pure/trunk/config.h.in
===================================================================
--- pure/trunk/config.h.in	2008-09-08 14:24:48 UTC (rev 744)
+++ pure/trunk/config.h.in	2008-09-08 14:25:33 UTC (rev 745)
@@ -18,6 +18,9 @@
    */
 #undef HAVE_ALLOCA_H
 
+/* Define if BSD signal functions are available. */
+#undef HAVE_BSD_SIGNALS
+
 /* Define to 1 if you have the `ftime' function. */
 #undef HAVE_FTIME
 
@@ -54,6 +57,9 @@
 /* Define to 1 if you have the `nanosleep' function. */
 #undef HAVE_NANOSLEEP
 
+/* Define if POSIX signal functions are available. */
+#undef HAVE_POSIX_SIGNALS
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
@@ -75,6 +81,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define if SVR3 signal functions are available. */
+#undef HAVE_USG_SIGHOLD
+
 /* Define to 1 if you have the `usleep' function. */
 #undef HAVE_USLEEP
 
@@ -90,6 +99,9 @@
 /* Define as const if the declaration of iconv() needs const. */
 #undef ICONV_CONST
 
+/* Define if signal handlers must be reinstalled by handler. */
+#undef MUST_REINSTALL_SIGHANDLERS
+
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 
@@ -105,6 +117,9 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
+/* Define as the return type of signal handlers (`int' or `void'). */
+#undef RETSIGTYPE
+
 /* The size of `void *', as computed by sizeof. */
 #undef SIZEOF_VOID_P
 

Modified: pure/trunk/configure
===================================================================
--- pure/trunk/configure	2008-09-08 14:24:48 UTC (rev 744)
+++ pure/trunk/configure	2008-09-08 14:25:33 UTC (rev 745)
@@ -5472,6 +5472,352 @@
 fi
 done
 
+{ echo "$as_me:$LINENO: checking return type of signal handlers" >&5
+echo $ECHO_N "checking return type of signal handlers... $ECHO_C" >&6; }
+if test "${ac_cv_type_signal+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <sys/types.h>
+#include <signal.h>
+
+int
+main ()
+{
+return *(signal (0, 0)) (0) == 1;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  ac_cv_type_signal=int
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_type_signal=void
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_type_signal" >&5
+echo "${ECHO_T}$ac_cv_type_signal" >&6; }
+
+cat >>confdefs.h <<_ACEOF
+#define RETSIGTYPE $ac_cv_type_signal
+_ACEOF
+
+
+
+{ echo "$as_me:$LINENO: checking for type of signal functions" >&5
+echo $ECHO_N "checking for type of signal functions... $ECHO_C" >&6; }
+if test "${q_cv_signal_vintage+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <signal.h>
+int
+main ()
+{
+
+    sigset_t ss;
+    struct sigaction sa;
+    sigemptyset(&ss); sigsuspend(&ss);
+    sigaction(SIGINT, &sa, (struct sigaction *) 0);
+    sigprocmask(SIG_BLOCK, &ss, (sigset_t *) 0);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  q_cv_signal_vintage=posix
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <signal.h>
+int
+main ()
+{
+
+	int mask = sigmask(SIGINT);
+	sigsetmask(mask); sigblock(mask); sigpause(mask);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  q_cv_signal_vintage=4.2bsd
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+      cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+	#include <signal.h>
+	RETSIGTYPE foo() { }
+int
+main ()
+{
+
+		int mask = sigmask(SIGINT);
+		sigset(SIGINT, foo); sigrelse(SIGINT);
+		sighold(SIGINT); sigpause(SIGINT);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  q_cv_signal_vintage=svr3
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	q_cv_signal_vintage=v7
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
+fi
+
+{ echo "$as_me:$LINENO: result: $q_cv_signal_vintage" >&5
+echo "${ECHO_T}$q_cv_signal_vintage" >&6; }
+if test "$q_cv_signal_vintage" = posix; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_POSIX_SIGNALS 1
+_ACEOF
+
+elif test "$q_cv_signal_vintage" = "4.2bsd"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_BSD_SIGNALS 1
+_ACEOF
+
+elif test "$q_cv_signal_vintage" = svr3; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USG_SIGHOLD 1
+_ACEOF
+
+fi
+
+
+
+{ echo "$as_me:$LINENO: checking if signal handlers must be reinstalled when invoked" >&5
+echo $ECHO_N "checking if signal handlers must be reinstalled when invoked... $ECHO_C" >&6; }
+if test "${q_cv_must_reinstall_sighandlers+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test "$cross_compiling" = yes; then
+  if test "$q_cv_signal_vintage" = svr3; then
+  q_cv_must_reinstall_sighandlers=yes
+else
+  q_cv_must_reinstall_sighandlers=no
+fi
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#include <signal.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+typedef RETSIGTYPE sigfunc();
+int nsigint;
+#ifdef HAVE_POSIX_SIGNALS
+sigfunc *
+set_signal_handler(sig, handler)
+     int sig;
+     sigfunc *handler;
+{
+  struct sigaction act, oact;
+  act.sa_handler = handler;
+  act.sa_flags = 0;
+  sigemptyset (&act.sa_mask);
+  sigemptyset (&oact.sa_mask);
+  sigaction (sig, &act, &oact);
+  return (oact.sa_handler);
+}
+#else
+#define set_signal_handler(s, h) signal(s, h)
+#endif
+RETSIGTYPE
+sigint(s)
+    int s;
+{
+  nsigint++;
+}
+main()
+{
+  nsigint = 0;
+  set_signal_handler(SIGINT, sigint);
+  kill((int)getpid(), SIGINT);
+  kill((int)getpid(), SIGINT);
+  exit(nsigint != 2);
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  q_cv_must_reinstall_sighandlers=no
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+q_cv_must_reinstall_sighandlers=yes
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+fi
+
+if test "$cross_compiling" = yes; then
+  { echo "$as_me:$LINENO: result: $q_cv_must_reinstall_sighandlers assumed for cross compilation" >&5
+echo "${ECHO_T}$q_cv_must_reinstall_sighandlers assumed for cross compilation" >&6; }
+else
+  { echo "$as_me:$LINENO: result: $q_cv_must_reinstall_sighandlers" >&5
+echo "${ECHO_T}$q_cv_must_reinstall_sighandlers" >&6; }
+fi
+if test "$q_cv_must_reinstall_sighandlers" = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define MUST_REINSTALL_SIGHANDLERS 1
+_ACEOF
+
+fi
+
 { echo "$as_me:$LINENO: checking for _Complex float" >&5
 echo $ECHO_N "checking for _Complex float... $ECHO_C" >&6; }
 if test "${ac_cv_type__Complex_float+set}" = set; then

Modified: pure/trunk/configure.ac
===================================================================
--- pure/trunk/configure.ac	2008-09-08 14:24:48 UTC (rev 744)
+++ pure/trunk/configure.ac	2008-09-08 14:25:33 UTC (rev 745)
@@ -91,6 +91,8 @@
 AC_FUNC_ALLOCA
 dnl Platform-dependent time functions.
 AC_CHECK_FUNCS(ftime gettimeofday nanosleep usleep)
+dnl Platform specifics of signal handlers.
+AC_REINSTALL_SIGHANDLERS
 dnl Check to see whether we have POSIX/ISOC99 complex numbers.
 AC_CHECK_TYPES([_Complex float, _Complex double])
 AC_CONFIG_FILES([Makefile])


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