+# detect which IO API to use:
+
+x_io_backend=none
+
+AC_ARG_WITH(select,
+ [ --without-select disable select IO support (autodetected by default)],
+ [ if test "$withval" != "no"; then
+ if test "$withval" != "yes"; then
+ CFLAGS="-I$withval/include $CFLAGS"
+ CPPFLAGS="-I$withval/include $CPPFLAGS"
+ LDFLAGS="-L$withval/lib $LDFLAGS"
+ fi
+ AC_CHECK_FUNCS(select, x_io_select=yes,
+ AC_MSG_ERROR([Can't enable select IO support!])
+ )
+ fi
+ ],
+ [
+ AC_CHECK_FUNCS(select, x_io_select=yes)
+ ]
+)
+
+AC_ARG_WITH(poll,
+ [ --without-poll disable poll support (autodetected by default)],
+ [ if test "$withval" != "no"; then
+ if test "$withval" != "yes"; then
+ CFLAGS="-I$withval/include $CFLAGS"
+ CPPFLAGS="-I$withval/include $CPPFLAGS"
+ LDFLAGS="-L$withval/lib $LDFLAGS"
+ fi
+ AC_CHECK_FUNCS(poll, [
+ AC_CHECK_HEADERS(poll.h,
+ x_io_backend=poll\(\),
+ AC_MSG_ERROR(
+ [Can't enable poll IO support!])
+ )
+ ], [
+ AC_MSG_ERROR([Can't enable poll IO support!])
+ ])
+ fi
+ ],
+ [
+ AC_CHECK_FUNCS(poll, [
+ AC_CHECK_HEADERS(poll.h, x_io_backend=poll\(\))
+ ])
+ ]
+)
+
+AC_ARG_WITH(devpoll,
+ [ --without-devpoll disable /dev/poll IO support (autodetected by default)],
+ [ if test "$withval" != "no"; then
+ if test "$withval" != "yes"; then
+ CFLAGS="-I$withval/include $CFLAGS"
+ CPPFLAGS="-I$withval/include $CPPFLAGS"
+ LDFLAGS="-L$withval/lib $LDFLAGS"
+ fi
+
+ AC_CHECK_HEADERS(sys/devpoll.h,,AC_MSG_ERROR([required C header missing!]))
+ fi
+ ],
+ [
+ AC_CHECK_HEADERS(sys/devpoll.h, x_io_backend=/dev/poll)
+ ]
+)