1 files changed, 81 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4
index ff51c4c..01e4f6b 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -208,3 +208,84 @@ AC_DEFUN(jm_AC_TYPE_UINTMAX_T,
     fi
   fi
 ])
+
+
+dnl ---------------------------------------------------------------------------
+dnl From Steve Robbins <steve@nyongwa.montreal.qc.ca>
+
+dnl From a proposed change made on the autoconf list on 2 Feb 1999
+dnl http://sourceware.cygnus.com/ml/autoconf/1999-02/msg00001.html
+
+AC_DEFUN(AC_FUNC_SELECT,
+[AC_CHECK_FUNCS(select)
+if test "$ac_cv_func_select" = yes; then
+  AC_CHECK_HEADERS(unistd.h sys/types.h sys/time.h sys/select.h sys/socket.h)
+  AC_MSG_CHECKING([argument types of select()])
+  AC_CACHE_VAL(ac_cv_type_fd_set_size_t,dnl
+    [AC_CACHE_VAL(ac_cv_type_fd_set,dnl
+      [for ac_cv_type_fd_set in 'fd_set' 'int'; do
+        for ac_cv_type_fd_set_size_t in 'int' 'size_t' 'unsigned long' 'unsigned'; do
+          for ac_type_timeval in 'struct timeval' 'const struct timeval'; do
+            AC_TRY_COMPILE(dnl
+[#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif],
+[extern select ($ac_cv_type_fd_set_size_t,
+ $ac_cv_type_fd_set *,  $ac_cv_type_fd_set *, $ac_cv_type_fd_set *,
+ $ac_type_timeval *);],
+[ac_found=yes ; break 3],ac_found=no)
+          done
+        done
+      done
+    ])dnl AC_CACHE_VAL
+  ])dnl AC_CACHE_VAL
+  if test "$ac_found" = no; then
+    AC_MSG_ERROR([can't determine argument types])
+  fi
+
+  AC_MSG_RESULT([select($ac_cv_type_fd_set_size_t,$ac_cv_type_fd_set *,...)])
+  AC_DEFINE_UNQUOTED(fd_set_size_t, $ac_cv_type_fd_set_size_t)
+  ac_cast=
+  if test "$ac_cv_type_fd_set" != fd_set; then
+    # Arguments 2-4 are not fd_set.  Some weirdo systems use fd_set type for
+    # FD_SET macros, but insist that you cast the argument to select.  I don't
+    # understand why that might be, but it means we cannot define fd_set.
+    AC_EGREP_CPP(dnl
+changequote(<<,>>)dnl
+<<(^|[^a-zA-Z_0-9])fd_set[^a-zA-Z_0-9]>>dnl
+changequote([,]),dnl
+[#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif],dnl
+    # We found fd_set type in a header, need special cast
+    ac_cast="($ac_cv_type_fd_set *)",dnl
+    # No fd_set type; it is safe to define it
+    AC_DEFINE_UNQUOTED(fd_set,$ac_cv_type_fd_set))
+  fi
+  AC_DEFINE_UNQUOTED(SELECT_FD_SET_CAST,$ac_cast)
+fi
+])