init

acinclude.m4

@@ -0,0 +1,107 @@
+dnl ------------------
+dnl Check for properly working isblank()
+dnl ------------------
+AC_DEFUN([joe_ISBLANK],
+	[AC_CACHE_CHECK([whether isblank() works correctly with side effect expressions],
+		[joe_cv_isblank],
+		[AC_TRY_RUN([
+#include <ctype.h>
+int main() {
+  int a = 0;
+  isblank(a++);
+  exit(a != 1);
+}
+			],
+			[joe_cv_isblank=yes],
+			[joe_cv_isblank=no],
+			[joe_cv_isblank=no])
+		])
+	if test "$joe_cv_isblank" = yes; then
+		AC_DEFINE([HAVE_WORKING_ISBLANK], 1, [Define if isblank() works with expressions with side effects])
+	fi
+])
+
+dnl ------------------
+dnl Check if setpgrp must have two arguments
+dnl autoconf-own macro is damaged for *BSD systems
+dnl ------------------
+AC_DEFUN([joe_SETPGRP],
+	[AC_CACHE_CHECK([whether setpgrp() takes no arguments],
+		[joe_cv_setpgrp_void],
+		[AC_TRY_RUN([
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+int main() {
+	/* exit succesfully if setpgrp() takes two args (*BSD systems) */
+	exit(setpgrp(0, 0) != 0);
+}],
+			[joe_cv_setpgrp_void=no],
+			[joe_cv_setpgrp_void=yes],
+			[joe_cv_setpgrp_void=yes])
+		])
+	if test "$joe_cv_setpgrp_void" = yes; then
+		AC_DEFINE([SETPGRP_VOID], 1, [Define if setpgrp() takes no arguments])
+	fi
+])
+
+dnl ------------------
+dnl Check to see if signal handlers must be reinstalled when invoked
+dnl ------------------
+AC_DEFUN([joe_REINSTALL_SIGHANDLERS],
+	[AC_CACHE_CHECK([whether sighandlers must be reinstalled],
+		[joe_cv_reinstall_sighandlers],
+		[AC_TRY_RUN([
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
+#ifndef HAVE_SIGHANDLER_T
+typedef RETSIGTYPE (*sighandler_t)(int);
+#endif
+
+int nsigint;
+
+void set_signal(int signum, sighandler_t handler) {
+#if HAVE_SIGACTION
+        struct sigaction sact;
+
+        sact.sa_handler = handler;
+	sact.sa_flags = 0;
+	sigemptyset(&sact.sa_mask);
+        sigaction(signum, &sact, NULL);
+#elif HAVE_SIGVEC
+        struct sigvec svec;
+
+        svec.sv_handler = handler;
+	svec.sv_flags = 0;
+	sigemptyset(&svec.sv_mask);
+        sigvec(signum, &svec, NULL);
+#else
+        signal(signum, handler);
+#endif
+}
+
+RETSIGTYPE sigint(int s) {
+	nsigint++;
+}
+
+int main() {
+	nsigint = 0;
+	set_signal(SIGINT, sigint);
+	kill((int)getpid(), SIGINT);
+	kill((int)getpid(), SIGINT);
+	/* exit succesfully if don't have to reinstall sighandler when invoked */
+	exit(nsigint != 2);
+}],
+			[joe_cv_reinstall_sighandlers=no],
+			[joe_cv_reinstall_sighandlers=yes],
+			[joe_cv_reinstall_sighandlers=yes])
+		])
+	if test "$joe_cv_reinstall_sighandlers" = yes; then
+		AC_DEFINE([NEED_TO_REINSTALL_SIGNAL], 1, [Define if we have to reinstall signal handler when invoked])
+	fi
+])