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annotate m4/nanosleep.m4 @ 11069:8488a80e49bc

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nanosleep: skip configure test (fail it) for apple universal builds * m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Require gl_MULTIARCH. In Apple universal builds, assume that nanosleep does not work. * modules/nanosleep (Depends-on): Add multiarch.
author Bruno Haible <bruno@clisp.org>
date Wed, 21 Jan 2009 20:27:39 +0100
parents f6cba5a556ce
children d9a855dec815
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # serial 27
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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) 1999-2001, 2003-2009 Free Software Foundation, Inc.
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9
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10 # This file is free software; the Free Software Foundation
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11 # gives unlimited permission to copy and/or distribute it,
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12 # with or without modifications, as long as this notice is preserved.
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13
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14 AC_DEFUN([gl_FUNC_NANOSLEEP],
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15 [
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16 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
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17 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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18
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19 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
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20 AC_REQUIRE([gl_CLOCK_TIME])
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21 AC_CHECK_HEADERS_ONCE([sys/time.h])
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22
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23 nanosleep_save_libs=$LIBS
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24
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25 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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26 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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27 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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28 [test "$ac_cv_search_nanosleep" = "none required" ||
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29 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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30
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31 AC_REQUIRE([gl_MULTIARCH])
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32 if test $APPLE_UNIVERSAL_BUILD = 1; then
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33 # A universal build on Apple MacOS X platforms.
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34 # The test result would be 'no (mishandles large arguments)' in 64-bit mode
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35 # but 'yes' in 32-bit mode. But we need a configuration result that is
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36 # valid in both modes.
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37 gl_cv_func_nanosleep='no (mishandles large arguments)'
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38 fi
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39
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40 AC_CACHE_CHECK([for working nanosleep],
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41 [gl_cv_func_nanosleep],
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42 [
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43 AC_RUN_IFELSE(
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44 [AC_LANG_SOURCE([[
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45 #include <errno.h>
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46 #include <limits.h>
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47 #include <signal.h>
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48 #if HAVE_SYS_TIME_H
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49 #include <sys/time.h>
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50 #endif
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51 #include <time.h>
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52 #include <unistd.h>
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53 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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54 #define TYPE_MAXIMUM(t) \
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55 ((t) (! TYPE_SIGNED (t) \
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56 ? (t) -1 \
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57 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
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58
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59 static void
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60 check_for_SIGALRM (int sig)
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61 {
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62 if (sig != SIGALRM)
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63 _exit (1);
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64 }
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65
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66 int
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67 main ()
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68 {
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69 static struct timespec ts_sleep;
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70 static struct timespec ts_remaining;
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71 static struct sigaction act;
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72 if (! nanosleep)
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73 return 1;
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74 act.sa_handler = check_for_SIGALRM;
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75 sigemptyset (&act.sa_mask);
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76 sigaction (SIGALRM, &act, NULL);
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77 ts_sleep.tv_sec = 0;
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78 ts_sleep.tv_nsec = 1;
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79 alarm (1);
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80 if (nanosleep (&ts_sleep, NULL) != 0)
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81 return 1;
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82 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
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83 ts_sleep.tv_nsec = 999999999;
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84 alarm (1);
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85 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
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86 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
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87 return 0;
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88 return 119;
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89 }]])],
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90 [gl_cv_func_nanosleep=yes],
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91 [case $? in dnl (
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92 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
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93 *) gl_cv_func_nanosleep=no;;
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94 esac],
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95 [gl_cv_func_nanosleep=cross-compiling])
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96 ])
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97 if test "$gl_cv_func_nanosleep" = yes; then
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98 REPLACE_NANOSLEEP=0
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99 else
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100 REPLACE_NANOSLEEP=1
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101 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
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102 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
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103 [Define to 1 if nanosleep mishandles large arguments.])
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104 for ac_lib in $LIB_CLOCK_GETTIME; do
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105 case " $LIB_NANOSLEEP " in
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106 *" $ac_lib "*) ;;
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107 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
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108 esac
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109 done
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110 fi
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111 AC_LIBOBJ([nanosleep])
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112 gl_PREREQ_NANOSLEEP
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113 fi
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114
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115 AC_SUBST([LIB_NANOSLEEP])
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116 LIBS=$nanosleep_save_libs
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117 ])
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118
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119 # Prerequisites of lib/nanosleep.c.
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120 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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121 [
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122 AC_CHECK_HEADERS_ONCE([sys/select.h])
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18a5b4f796a2 Update after lib/sig-handler.h is no longer included by lib/sigprocmask.c.
Bruno Haible <bruno@clisp.org>
parents: 10230
diff changeset
123 gl_PREREQ_SIG_HANDLER_H
4108
c1d472db5c30 An independent .m4 file for each module.
Bruno Haible <bruno@clisp.org>
parents: 3486
diff changeset
124 ])