diff options
Diffstat (limited to 'm4/nanosleep.m4')
| -rw-r--r-- | m4/nanosleep.m4 | 196 |
1 files changed, 114 insertions, 82 deletions
diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4 index a3a6814..12914d4 100644 --- a/m4/nanosleep.m4 +++ b/m4/nanosleep.m4 @@ -1,12 +1,11 @@ -#serial 22 +# serial 36 dnl From Jim Meyering. dnl Check for the nanosleep function. dnl If not found, use the supplied replacement. dnl -# Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007 Free -# Software Foundation, Inc. +# Copyright (C) 1999-2001, 2003-2016 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, @@ -14,103 +13,136 @@ dnl AC_DEFUN([gl_FUNC_NANOSLEEP], [ + AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + dnl Persuade glibc and Solaris <time.h> to declare nanosleep. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) - AC_REQUIRE([gl_CLOCK_TIME]) - AC_CHECK_HEADERS_ONCE(sys/time.h) + AC_CHECK_HEADERS_ONCE([sys/time.h]) + AC_REQUIRE([gl_FUNC_SELECT]) nanosleep_save_libs=$LIBS # Solaris 2.5.1 needs -lposix4 to get the nanosleep function. # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. + LIB_NANOSLEEP= + AC_SUBST([LIB_NANOSLEEP]) AC_SEARCH_LIBS([nanosleep], [rt posix4], [test "$ac_cv_search_nanosleep" = "none required" || - LIB_NANOSLEEP=$ac_cv_search_nanosleep]) + LIB_NANOSLEEP=$ac_cv_search_nanosleep]) + if test "x$ac_cv_search_nanosleep" != xno; then + dnl The system has a nanosleep function. - AC_CACHE_CHECK([for working nanosleep], - [gl_cv_func_nanosleep], - [ - AC_RUN_IFELSE( - [AC_LANG_SOURCE([[ - #include <errno.h> - #include <limits.h> - #include <signal.h> - #if HAVE_SYS_TIME_H - #include <sys/time.h> - #endif - #include <time.h> - #include <unistd.h> - #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) - #define TYPE_MAXIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) -1 \ - : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))) + AC_REQUIRE([gl_MULTIARCH]) + if test $APPLE_UNIVERSAL_BUILD = 1; then + # A universal build on Apple Mac OS X platforms. + # The test result would be 'no (mishandles large arguments)' in 64-bit + # mode but 'yes' in 32-bit mode. But we need a configuration result that + # is valid in both modes. + gl_cv_func_nanosleep='no (mishandles large arguments)' + fi - static void - check_for_SIGALRM (int sig) - { - if (sig != SIGALRM) - _exit (1); - } + AC_CACHE_CHECK([for working nanosleep], + [gl_cv_func_nanosleep], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ + #include <errno.h> + #include <limits.h> + #include <signal.h> + #if HAVE_SYS_TIME_H + #include <sys/time.h> + #endif + #include <time.h> + #include <unistd.h> + #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) + #define TYPE_MAXIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) -1 \ + : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1))) - int - main () - { - static struct timespec ts_sleep; - static struct timespec ts_remaining; - static struct sigaction act; - if (! nanosleep) - return 1; - act.sa_handler = check_for_SIGALRM; - sigemptyset (&act.sa_mask); - sigaction (SIGALRM, &act, NULL); - ts_sleep.tv_sec = 0; - ts_sleep.tv_nsec = 1; - alarm (1); - if (nanosleep (&ts_sleep, NULL) != 0) - return 1; - ts_sleep.tv_sec = TYPE_MAXIMUM (time_t); - ts_sleep.tv_nsec = 999999999; - alarm (1); - if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR - && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec) - return 0; - return 119; - }]])], - [gl_cv_func_nanosleep=yes], - [case $? in dnl ( - 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl ( - *) gl_cv_func_nanosleep=no;; - esac], - [gl_cv_func_nanosleep=cross-compiling]) - ]) - if test "$gl_cv_func_nanosleep" = yes; then - REPLACE_NANOSLEEP=0 - else - REPLACE_NANOSLEEP=1 - if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then - AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], 1, - [Define to 1 if nanosleep mishandle large arguments.]) - for ac_lib in $LIB_CLOCK_GETTIME; do - case " $LIB_NANOSLEEP " in - *" $ac_lib "*) ;; - *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";; - esac - done - fi - AC_LIBOBJ(nanosleep) - gl_PREREQ_NANOSLEEP - fi + static void + check_for_SIGALRM (int sig) + { + if (sig != SIGALRM) + _exit (1); + } - AC_SUBST([LIB_NANOSLEEP]) + int + main () + { + static struct timespec ts_sleep; + static struct timespec ts_remaining; + static struct sigaction act; + /* Test for major problems first. */ + if (! nanosleep) + return 2; + act.sa_handler = check_for_SIGALRM; + sigemptyset (&act.sa_mask); + sigaction (SIGALRM, &act, NULL); + ts_sleep.tv_sec = 0; + ts_sleep.tv_nsec = 1; + alarm (1); + if (nanosleep (&ts_sleep, NULL) != 0) + return 3; + /* Test for a minor problem: the handling of large arguments. */ + ts_sleep.tv_sec = TYPE_MAXIMUM (time_t); + ts_sleep.tv_nsec = 999999999; + alarm (1); + if (nanosleep (&ts_sleep, &ts_remaining) != -1) + return 4; + if (errno != EINTR) + return 5; + if (ts_remaining.tv_sec <= TYPE_MAXIMUM (time_t) - 10) + return 6; + return 0; + }]])], + [gl_cv_func_nanosleep=yes], + [case $? in dnl ( + 4|5|6) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl ( + *) gl_cv_func_nanosleep=no;; + esac], + [case "$host_os" in dnl (( + linux*) # Guess it halfway works when the kernel is Linux. + gl_cv_func_nanosleep='guessing no (mishandles large arguments)' ;; + *) # If we don't know, assume the worst. + gl_cv_func_nanosleep='guessing no' ;; + esac + ]) + ]) + case "$gl_cv_func_nanosleep" in + *yes) + REPLACE_NANOSLEEP=0 + ;; + *) + REPLACE_NANOSLEEP=1 + case "$gl_cv_func_nanosleep" in + *"mishandles large arguments"*) + AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1], + [Define to 1 if nanosleep mishandles large arguments.]) + ;; + *) + # The replacement uses select(). Add $LIBSOCKET to $LIB_NANOSLEEP. + for ac_lib in $LIBSOCKET; do + case " $LIB_NANOSLEEP " in + *" $ac_lib "*) ;; + *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";; + esac + done + ;; + esac + ;; + esac + else + HAVE_NANOSLEEP=0 + fi LIBS=$nanosleep_save_libs ]) # Prerequisites of lib/nanosleep.c. AC_DEFUN([gl_PREREQ_NANOSLEEP], [ - AC_CHECK_FUNCS_ONCE(siginterrupt) - AC_CHECK_HEADERS_ONCE(sys/select.h) + AC_CHECK_HEADERS_ONCE([sys/select.h]) + gl_PREREQ_SIG_HANDLER_H ]) |