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annotate m4/nanosleep.m4 @ 4910:de285d9e7c4d

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Merge from coreutils.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 16 Jan 2004 07:55:43 +0000
parents c1d472db5c30
children 7141ea4946af
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1 #serial 9
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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 AC_DEFUN([jm_FUNC_NANOSLEEP],
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9 [
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10 nanosleep_save_libs=$LIBS
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11
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12 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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13 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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14 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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15 [test "$ac_cv_search_nanosleep" = "none required" ||
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16 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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17 AC_SUBST([LIB_NANOSLEEP])
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18
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19 AC_CACHE_CHECK([whether nanosleep works],
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20 jm_cv_func_nanosleep_works,
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21 [
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22 AC_REQUIRE([AC_HEADER_TIME])
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23 AC_CHECK_HEADERS_ONCE(sys/time.h)
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24 AC_TRY_RUN([
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25 # if TIME_WITH_SYS_TIME
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26 # include <sys/time.h>
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27 # include <time.h>
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28 # else
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29 # if HAVE_SYS_TIME_H
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30 # include <sys/time.h>
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31 # else
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32 # include <time.h>
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33 # endif
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34 # endif
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36 int
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37 main ()
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38 {
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39 struct timespec ts_sleep, ts_remaining;
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40 ts_sleep.tv_sec = 0;
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41 ts_sleep.tv_nsec = 1;
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42 exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
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43 }
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44 ],
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45 jm_cv_func_nanosleep_works=yes,
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46 jm_cv_func_nanosleep_works=no,
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47 dnl When crosscompiling, assume the worst.
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48 jm_cv_func_nanosleep_works=no)
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49 ])
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50 if test $jm_cv_func_nanosleep_works = no; then
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51 AC_LIBOBJ(nanosleep)
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52 AC_DEFINE(nanosleep, rpl_nanosleep,
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53 [Define to rpl_nanosleep if the replacement function should be used.])
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54 gl_PREREQ_NANOSLEEP
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55 fi
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56
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57 LIBS=$nanosleep_save_libs
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58 ])
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59
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60 # Prerequisites of lib/nanosleep.c.
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61 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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62 [
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63 AC_CHECK_HEADERS_ONCE(unistd.h)
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64 ])