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annotate m4/nanosleep.m4 @ 6795:9dc5bb3f3359

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* lib/nanosleep.c [HAVE_SYS_SELECT_H]: Include <sys/select.h>. Use the usual Autoconf way to include <time.h> and/or sys/time.h. (my_usleep): Don't mishandle maximum value. * m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Rename cache variables to use gl_ rather than jm_. Link, don't run, so that cross-compiles are allowed. Check that resulting type is arithmetic. Move AC_REQUIRE and AC_CHECK_HEADERS_ONCE outside of AC_CACHE_CHECK, since they're not really conditional on the cache. (gl_PREREQ_NANOSLEEP): Check for sys/select.h.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 19 May 2006 17:49:21 +0000
parents 3d99d01160aa
children be9e01d008cb
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1 #serial 17
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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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19 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
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20 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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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
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25 nanosleep_save_libs=$LIBS
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26
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27 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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28 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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29 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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30 [test "$ac_cv_search_nanosleep" = "none required" ||
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31 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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32 AC_SUBST([LIB_NANOSLEEP])
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34 AC_CACHE_CHECK([for nanosleep],
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35 [gl_cv_func_nanosleep],
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36 [
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37 AC_LINK_IFELSE([AC_LANG_SOURCE([[
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38 # if TIME_WITH_SYS_TIME
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39 # include <sys/time.h>
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40 # include <time.h>
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41 # else
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42 # if HAVE_SYS_TIME_H
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43 # include <sys/time.h>
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44 # else
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45 # include <time.h>
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46 # endif
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47 # endif
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48
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49 int
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50 main ()
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51 {
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52 struct timespec ts_sleep, ts_remaining;
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53 ts_sleep.tv_sec = 0;
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54 ts_sleep.tv_nsec = 1;
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55 return nanosleep (&ts_sleep, &ts_remaining) < 0;
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56 }
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57 ]])],
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58 [gl_cv_func_nanosleep=yes],
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59 [gl_cv_func_nanosleep=no])
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60 ])
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61 if test $gl_cv_func_nanosleep = no; then
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62 AC_LIBOBJ(nanosleep)
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63 AC_DEFINE(nanosleep, rpl_nanosleep,
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64 [Define to rpl_nanosleep if the replacement function should be used.])
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65 gl_PREREQ_NANOSLEEP
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66 fi
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68 LIBS=$nanosleep_save_libs
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69 ])
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71 # Prerequisites of lib/nanosleep.c.
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72 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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73 [
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74 AC_CHECK_FUNCS_ONCE(siginterrupt)
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75 AC_CHECK_HEADERS_ONCE(sys/select.h)
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76 ])