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annotate m4/nanosleep.m4 @ 10230:54813304edd2

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Use sigaction module rather than signal(). * modules/c-stack (Depends-on): Add sigaction. * modules/fatal-signal (Depends-on): Likewise. * modules/nanosleep (Depends-on): Likewise. * modules/sigprocmask (Files): Add sig-handler.h. * modules/sigaction (Files): Likewise. * lib/sig-handler.h (get_handler): New file, suggested by Paul Eggert. * lib/c-stack.c (SIGACTION_WORKS): Simplify conditions. (c_stack_action) [!SIGACTION_WORKS]: Use sigaction, not signal. * lib/fatal-signal.c (uninstall_handlers, install_handlers) (init_fatal_signals): Likewise. * lib/nanosleep.c (rpl_nanosleep): Likewise. (siginterrupt): Delete fallback. * lib/sigprocmask.c (handler_t): Delete. (old_handlers): Use sa_handler_t instead. * m4/nanosleep.m4 (gl_PREREQ_NANOSLEEP): Drop check for siginterrupt. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Sat, 21 Jun 2008 07:08:49 -0600
parents 11c77fefd9e5
children 18a5b4f796a2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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10230
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1 #serial 24
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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, 2007, 2008
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9 # Free Software 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 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
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18 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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19
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20 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
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21 AC_REQUIRE([gl_CLOCK_TIME])
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22 AC_CHECK_HEADERS_ONCE(sys/time.h)
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23
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24 nanosleep_save_libs=$LIBS
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25
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26 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
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27 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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28 AC_SEARCH_LIBS([nanosleep], [rt posix4],
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29 [test "$ac_cv_search_nanosleep" = "none required" ||
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30 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
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31
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32 AC_CACHE_CHECK([for working nanosleep],
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33 [gl_cv_func_nanosleep],
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34 [
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35 AC_RUN_IFELSE(
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36 [AC_LANG_SOURCE([[
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37 #include <errno.h>
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38 #include <limits.h>
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39 #include <signal.h>
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40 #if HAVE_SYS_TIME_H
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41 #include <sys/time.h>
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42 #endif
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43 #include <time.h>
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44 #include <unistd.h>
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45 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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46 #define TYPE_MAXIMUM(t) \
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47 ((t) (! TYPE_SIGNED (t) \
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48 ? (t) -1 \
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49 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
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50
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51 static void
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52 check_for_SIGALRM (int sig)
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53 {
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54 if (sig != SIGALRM)
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55 _exit (1);
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56 }
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57
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58 int
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59 main ()
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60 {
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61 static struct timespec ts_sleep;
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62 static struct timespec ts_remaining;
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63 static struct sigaction act;
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64 if (! nanosleep)
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65 return 1;
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66 act.sa_handler = check_for_SIGALRM;
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67 sigemptyset (&act.sa_mask);
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68 sigaction (SIGALRM, &act, NULL);
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69 ts_sleep.tv_sec = 0;
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70 ts_sleep.tv_nsec = 1;
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71 alarm (1);
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72 if (nanosleep (&ts_sleep, NULL) != 0)
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73 return 1;
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74 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
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75 ts_sleep.tv_nsec = 999999999;
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76 alarm (1);
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77 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
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78 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
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79 return 0;
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80 return 119;
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81 }]])],
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82 [gl_cv_func_nanosleep=yes],
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83 [case $? in dnl (
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84 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
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85 *) gl_cv_func_nanosleep=no;;
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86 esac],
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87 [gl_cv_func_nanosleep=cross-compiling])
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88 ])
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89 if test "$gl_cv_func_nanosleep" = yes; then
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90 REPLACE_NANOSLEEP=0
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91 else
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92 REPLACE_NANOSLEEP=1
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93 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
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94 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], 1,
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95 [Define to 1 if nanosleep mishandles large arguments.])
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96 for ac_lib in $LIB_CLOCK_GETTIME; do
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97 case " $LIB_NANOSLEEP " in
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98 *" $ac_lib "*) ;;
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99 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
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100 esac
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101 done
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102 fi
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103 AC_LIBOBJ(nanosleep)
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104 gl_PREREQ_NANOSLEEP
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105 fi
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106
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107 AC_SUBST([LIB_NANOSLEEP])
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108 LIBS=$nanosleep_save_libs
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109 ])
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110
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111 # Prerequisites of lib/nanosleep.c.
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112 AC_DEFUN([gl_PREREQ_NANOSLEEP],
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113 [
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114 AC_CHECK_HEADERS_ONCE(sys/select.h)
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115 ])