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annotate m4/nanosleep.m4 @ 5813:6962b5c5069f

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Merge from coreutils.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 02 May 2005 07:00:50 +0000
parents abd018cd6020
children fd0ccce602e4
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1 #serial 13
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3 dnl From Jim Meyering.
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4 dnl Check for the nanosleep function.
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5 dnl If not found, use the supplied replacement.
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6 dnl
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7
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8 # Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
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9 # This file is free software; the Free Software Foundation
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10 # gives unlimited permission to copy and/or distribute it,
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11 # with or without modifications, as long as this notice is preserved.
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12
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13 AC_DEFUN([gl_FUNC_NANOSLEEP],
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14 [
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15 AC_LIBSOURCES([nanosleep.c])
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16
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17 nanosleep_save_libs=$LIBS
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18
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19 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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20 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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21 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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22 [test "$ac_cv_search_nanosleep" = "none required" ||
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23 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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24 AC_SUBST([LIB_NANOSLEEP])
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25
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26 AC_CACHE_CHECK([whether nanosleep works],
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27 jm_cv_func_nanosleep_works,
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28 [
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29 AC_REQUIRE([AC_HEADER_TIME])
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30 AC_CHECK_HEADERS_ONCE(sys/time.h)
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31 AC_TRY_RUN([
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32 # if TIME_WITH_SYS_TIME
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33 # include <sys/time.h>
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34 # include <time.h>
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35 # else
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36 # if HAVE_SYS_TIME_H
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37 # include <sys/time.h>
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38 # else
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39 # include <time.h>
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40 # endif
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41 # endif
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42
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43 int
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44 main ()
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45 {
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46 struct timespec ts_sleep, ts_remaining;
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47 ts_sleep.tv_sec = 0;
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48 ts_sleep.tv_nsec = 1;
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49 exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
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50 }
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51 ],
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52 jm_cv_func_nanosleep_works=yes,
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53 jm_cv_func_nanosleep_works=no,
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54 dnl When crosscompiling, assume the worst.
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55 jm_cv_func_nanosleep_works=no)
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56 ])
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57 if test $jm_cv_func_nanosleep_works = no; then
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58 AC_LIBOBJ(nanosleep)
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59 AC_DEFINE(nanosleep, rpl_nanosleep,
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60 [Define to rpl_nanosleep if the replacement function should be used.])
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61 gl_PREREQ_NANOSLEEP
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62 fi
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63
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64 LIBS=$nanosleep_save_libs
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65 ])
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66
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67 # Prerequisites of lib/nanosleep.c.
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68 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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69 [
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70 AC_CHECK_HEADERS_ONCE(unistd.h)
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71 AC_CHECK_FUNCS_ONCE(siginterrupt)
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72 ])