# HW_HEADER_TIME_H
# ------------------
# Define HAVE_TIME_H to 1 if <time.h> is available.
AC_DEFUN([HW_HEADER_TIME_H],
[
AC_PREREQ([2.60])dnl Older releases should work if AC_CHECK_HEADERS is used.
AC_CHECK_HEADERS_ONCE([time.h])
])# HW_HEADER_TIME_H
# HW_LIBRT_TIMERS
# -----------------
# Set $hw_cv_librt_timers and $hw_cv_librt_timers_posix to "yes" or "no",
# respectively. If the timer_create() function is available and
# POSIX compliant, then the system's timer_create(), timer_settime(),
# and timer_delete() functions are used. Otherwise, make sure
# the replacement functions will be built.
#
# In the case where we are cross compiling, the POSIX detection of
# the timer_create() function is skipped, and instead the usual check
# for the existence of all the timer_* functions is done using
# AC_REPLACE_FUNCS.
#
# If enable_timer_replacement=true, the replacements is forced to be built.
AC_DEFUN([HW_LIBRT_TIMERS],
[
AC_PREREQ([2.60])dnl 2.59 should work if some AC_TYPE_* macros are replaced.
AC_REQUIRE([HW_HEADER_TIME_H])dnl Our check evaluates HAVE_TIME_H.
if test "xtrue" != x"$enable_timer_replacement"; then
AC_CHECK_FUNC([timer_create],
[hw_cv_librt_timers=yes],
[hw_cv_librt_timers=no])
AS_IF([test "$hw_cv_librt_timers" = yes],
[AC_CACHE_CHECK([if timer_create is supported on the system],
[hw_cv_librt_timers_posix],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#if HAVE_TIME_H
#include <time.h>
#endif
#include <errno.h>
static int test_timer_create()
{
timer_t timerid;
if(timer_create(CLOCK_REALTIME, NULL, &timerid) != 0)
{
/*
On this system, although the function is available,
no meaningful implementation is provided.
*/
if(errno == ENOSYS)
{
return 1;
}
}
return 0;
}]],
[[return test_timer_create();]])],
[hw_cv_librt_timers_posix=yes],
[hw_cv_librt_timers_posix=no],
[hw_cv_librt_timers_posix=autodetect])])],
[hw_cv_librt_timers_posix=no])
else
hw_cv_librt_timers_posix=no
fi
# If the system does not have a POSIX timer_create(), then use
# Check's reimplementation of the timer_* calls
AS_IF([test "$hw_cv_librt_timers_posix" = no],
[_HW_LIBRT_TIMERS_REPLACE])
# If we are cross compiling, do the normal check for the
# timer_* calls.
AS_IF([test "$hw_cv_librt_timers_posix" = autodetect],
[AC_REPLACE_FUNCS([timer_create timer_settime timer_delete])
AC_CHECK_DECLS([timer_create, timer_settime, timer_delete])])
])# HW_LIBRT_TIMERS
# _HW_LIBRT_TIMERS_REPLACE
# ------------------------
# Arrange for building timer_create.c, timer_settime.c, and
# timer_delete.c.
AC_DEFUN([_HW_LIBRT_TIMERS_REPLACE],
[
AS_IF([test "x$_hw_cv_librt_timers_replace_done" != xyes],
[AC_LIBOBJ([timer_create])
AC_LIBOBJ([timer_settime])
AC_LIBOBJ([timer_delete])
_hw_cv_librt_timers_replace_done=yes])
])# _HW_LIBRT_TIMERS_REPLACE