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annotate m4/nanosleep.m4 @ 6671:5a2089992925

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* modules/gettime (Depends-on): Add extensions module. * modules/nanosleep (Depends-on): Likewise. * modules/settime (Depends-on): Likewise. * m4/clock_time.m4 (gl_CLOCK_TIME): Require gl_USE_SYSTEM_EXTENSIONS, not merely AC_GNU_SOURCE, for the benefit of Solaris 10 when compiled pedantically. * m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Likewise. * m4/timespec.m4 (gl_TIMESPEC): Likewise.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 02 Mar 2006 07:36:41 +0000
parents fd0ccce602e4
children 3d99d01160aa
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5a2089992925 * modules/gettime (Depends-on): Add extensions module.
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1 #serial 15
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2
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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, 2006 Free Software
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9 # Foundation, Inc.
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10
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11 # This file is free software; the Free Software Foundation
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12 # gives unlimited permission to copy and/or distribute it,
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13 # with or without modifications, as long as this notice is preserved.
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14
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15 AC_DEFUN([gl_FUNC_NANOSLEEP],
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16 [
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17 AC_LIBSOURCES([nanosleep.c])
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18
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19 nanosleep_save_libs=$LIBS
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20
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21 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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22 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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23 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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24 [test "$ac_cv_search_nanosleep" = "none required" ||
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25 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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26 AC_SUBST([LIB_NANOSLEEP])
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27
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28 AC_CACHE_CHECK([whether nanosleep works],
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29 jm_cv_func_nanosleep_works,
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30 [
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31 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
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32 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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33
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34 AC_REQUIRE([AC_HEADER_TIME])
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35 AC_CHECK_HEADERS_ONCE(sys/time.h)
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36 AC_TRY_RUN([
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37 # if TIME_WITH_SYS_TIME
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38 # include <sys/time.h>
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39 # include <time.h>
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40 # else
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41 # if HAVE_SYS_TIME_H
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42 # include <sys/time.h>
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43 # else
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44 # include <time.h>
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45 # endif
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46 # endif
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47
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48 int
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49 main ()
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50 {
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51 struct timespec ts_sleep, ts_remaining;
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52 ts_sleep.tv_sec = 0;
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53 ts_sleep.tv_nsec = 1;
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54 exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
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55 }
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56 ],
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57 jm_cv_func_nanosleep_works=yes,
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58 jm_cv_func_nanosleep_works=no,
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59 dnl When crosscompiling, assume the worst.
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60 jm_cv_func_nanosleep_works=no)
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61 ])
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62 if test $jm_cv_func_nanosleep_works = no; then
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63 AC_LIBOBJ(nanosleep)
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64 AC_DEFINE(nanosleep, rpl_nanosleep,
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65 [Define to rpl_nanosleep if the replacement function should be used.])
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66 gl_PREREQ_NANOSLEEP
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67 fi
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69 LIBS=$nanosleep_save_libs
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70 ])
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72 # Prerequisites of lib/nanosleep.c.
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73 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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74 [
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75 AC_CHECK_FUNCS_ONCE(siginterrupt)
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76 ])