New module sigaction, for mingw.

[gnulib.git] / m4 / sigaction.m4

diff --git a/m4/sigaction.m4 b/m4/sigaction.m4
new file mode 100644 (file)
index 0000000..2f1a4cd
--- /dev/null
+++ b/m4/sigaction.m4
@@ -0,0 +1,35 @@
+# sigaction.m4 serial 1
+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,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Determine if sigaction interface is present.
+AC_DEFUN([gl_SIGACTION],
+[
+  dnl Due to autoconf conventions, we can't tell if HAVE_SIGACTION
+  dnl means we have the type or means we have the function.  We assume
+  dnl that all implementations either have both or neither.
+  AC_REPLACE_FUNCS([sigaction])
+  if test $ac_cv_func_sigaction = no ; then
+    HAVE_SIGACTION=0
+    AC_SUBST([HAVE_SIGACTION])
+    gl_PREREQ_SIGACTION
+  fi
+])
+
+# Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c.
+AC_DEFUN([gl_PREREQ_SIGACTION],
+[
+  AC_REQUIRE([AC_C_RESTRICT])
+  AC_REQUIRE([AC_TYPE_UID_T])
+  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([sigaltstack siginterrupt])
+  AC_CHECK_TYPES([siginfo_t], [], [], [[
+#include <signal.h>
+  ]])
+  if test $ac_cv_type_siginfo_t = no; then
+    HAVE_SIGINFO_T=0
+    AC_SUBST([HAVE_SIGINFO_T])
+  fi
+])