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      2 
      3 dnl From Jim Meyering.
      4 dnl Check for the nanosleep function.
      5 dnl If not found, use the supplied replacement.
      6 dnl
      7 
      8 # Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
      9 # This file is free software; the Free Software Foundation
     10 # gives unlimited permission to copy and/or distribute it,
     11 # with or without modifications, as long as this notice is preserved.
     12 
     13 AC_DEFUN([gl_FUNC_NANOSLEEP],
     14 [
     15  AC_LIBSOURCES([nanosleep.c])
     16 
     17  nanosleep_save_libs=$LIBS
     18 
     19  # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
     20  # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
     21  AC_SEARCH_LIBS([nanosleep], [rt posix4],
     22                 [test "$ac_cv_search_nanosleep" = "none required" ||
     23 	         LIB_NANOSLEEP=$ac_cv_search_nanosleep])
     24  AC_SUBST([LIB_NANOSLEEP])
     25 
     26  AC_CACHE_CHECK([whether nanosleep works],
     27   jm_cv_func_nanosleep_works,
     28   [
     29    AC_REQUIRE([AC_HEADER_TIME])
     30    AC_CHECK_HEADERS_ONCE(sys/time.h)
     31    AC_TRY_RUN([
     32 #   if TIME_WITH_SYS_TIME
     33 #    include <sys/time.h>
     34 #    include <time.h>
     35 #   else
     36 #    if HAVE_SYS_TIME_H
     37 #     include <sys/time.h>
     38 #    else
     39 #     include <time.h>
     40 #    endif
     41 #   endif
     42 
     43     int
     44     main ()
     45     {
     46       struct timespec ts_sleep, ts_remaining;
     47       ts_sleep.tv_sec = 0;
     48       ts_sleep.tv_nsec = 1;
     49       exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
     50     }
     51 	  ],
     52 	 jm_cv_func_nanosleep_works=yes,
     53 	 jm_cv_func_nanosleep_works=no,
     54 	 dnl When crosscompiling, assume the worst.
     55 	 jm_cv_func_nanosleep_works=no)
     56   ])
     57   if test $jm_cv_func_nanosleep_works = no; then
     58     AC_LIBOBJ(nanosleep)
     59     AC_DEFINE(nanosleep, rpl_nanosleep,
     60       [Define to rpl_nanosleep if the replacement function should be used.])
     61     gl_PREREQ_NANOSLEEP
     62   fi
     63 
     64  LIBS=$nanosleep_save_libs
     65 ])
     66 
     67 # Prerequisites of lib/nanosleep.c.
     68 AC_DEFUN([gl_PREREQ_NANOSLEEP],
     69 [
     70   AC_CHECK_HEADERS_ONCE(unistd.h)
     71   AC_CHECK_FUNCS_ONCE(siginterrupt)
     72 ])
     73