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#serial 9
dnl From Jim Meyering.
dnl Check for the nanosleep function.
dnl If not found, use the supplied replacement.
dnl
AC_DEFUN([jm_FUNC_NANOSLEEP],
[
nanosleep_save_libs=$LIBS
# Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
# Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
AC_SEARCH_LIBS(nanosleep, [rt posix4], [LIB_NANOSLEEP=$ac_cv_search_nanosleep])
AC_SUBST(LIB_NANOSLEEP)
AC_CACHE_CHECK([whether nanosleep works],
jm_cv_func_nanosleep_works,
[
AC_REQUIRE([AC_HEADER_TIME])
AC_CHECK_HEADERS_ONCE(sys/time.h)
AC_TRY_RUN([
# if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
# endif
int
main ()
{
struct timespec ts_sleep, ts_remaining;
ts_sleep.tv_sec = 0;
ts_sleep.tv_nsec = 1;
exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
}
],
jm_cv_func_nanosleep_works=yes,
jm_cv_func_nanosleep_works=no,
dnl When crosscompiling, assume the worst.
jm_cv_func_nanosleep_works=no)
])
if test $jm_cv_func_nanosleep_works = no; then
AC_LIBOBJ(nanosleep)
AC_DEFINE(nanosleep, rpl_nanosleep,
[Define to rpl_nanosleep if the replacement function should be used.])
gl_PREREQ_NANOSLEEP
fi
LIBS=$nanosleep_save_libs
])
# Prerequisites of lib/nanosleep.c.
AC_DEFUN([gl_PREREQ_NANOSLEEP],
[
AC_CHECK_HEADERS_ONCE(unistd.h)
])
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