dnl this file is part of libev, do not make local modifications

dnl http://software.schmorp.de/pkg/libev

dnl libev support

AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h port.h poll.h sys/select.h sys/eventfd.h sys/signalfd.h)

AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select eventfd signalfd)

AC_CHECK_FUNCS(clock_gettime, [], [

   dnl on linux, try syscall wrapper first

   if test $(uname) = Linux; then

      AC_MSG_CHECKING(for clock_gettime syscall)

      AC_LINK_IFELSE([AC_LANG_PROGRAM(

                      [#include <unistd.h>

                       #include <sys/syscall.h>

                       #include <time.h>],

                      [struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],

                     [ac_have_clock_syscall=1

                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, Define to 1 to use the syscall interface for clock_gettime)

                      AC_MSG_RESULT(yes)],

                     [AC_MSG_RESULT(no)])

   fi

   if test -z "$LIBEV_M4_AVOID_LIBRT" && test -z "$ac_have_clock_syscall"; then

      AC_CHECK_LIB(rt, clock_gettime)

      unset ac_cv_func_clock_gettime

      AC_CHECK_FUNCS(clock_gettime)

   fi

])

AC_CHECK_FUNCS(nanosleep, [], [

   if test -z "$LIBEV_M4_AVOID_LIBRT"; then

      AC_CHECK_LIB(rt, nanosleep)

      unset ac_cv_func_nanosleep

      AC_CHECK_FUNCS(nanosleep)

   fi

])

if test -z "$LIBEV_M4_AVOID_LIBM"; then

   LIBM=m

fi

AC_SEARCH_LIBS(floor, $LIBM, [AC_DEFINE(HAVE_FLOOR, 1, Define to 1 if the floor function is available)])