#serial 22 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. # 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 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 #include #include #if HAVE_SYS_TIME_H #include #endif #include #include #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 mishandle large arguments.]) for ac_lib in $LIB_CLOCK_GETTIME; do case " $LIB_NANOSLEEP " in *" $ac_lib "*) ;; *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";; esac done fi AC_LIBOBJ(nanosleep) gl_PREREQ_NANOSLEEP fi AC_SUBST([LIB_NANOSLEEP]) LIBS=$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) ])