Mercurial > gnulib
view m4/nanosleep.m4 @ 10230:54813304edd2
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 |
line wrap: on
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#serial 24 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, 2008 # Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_NANOSLEEP], [ 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) nanosleep_save_libs=$LIBS # Solaris 2.5.1 needs -lposix4 to get the nanosleep function. # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. AC_SEARCH_LIBS([nanosleep], [rt posix4], [test "$ac_cv_search_nanosleep" = "none required" || LIB_NANOSLEEP=$ac_cv_search_nanosleep]) 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)))) static void check_for_SIGALRM (int sig) { if (sig != SIGALRM) _exit (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 mishandles large arguments.]) for ac_lib in $LIB_CLOCK_GETTIME; do case " $LIB_NANOSLEEP " in *" $ac_lib "*) ;; *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";; esac done fi AC_LIBOBJ(nanosleep) gl_PREREQ_NANOSLEEP fi AC_SUBST([LIB_NANOSLEEP]) LIBS=$nanosleep_save_libs ]) # Prerequisites of lib/nanosleep.c. AC_DEFUN([gl_PREREQ_NANOSLEEP], [ AC_CHECK_HEADERS_ONCE(sys/select.h) ])