4 dnl Check for the nanosleep function.
5 dnl If not found, use the supplied replacement.
8 # Copyright (C) 1999-2001, 2003-2009 Free Software Foundation, Inc.
10 # This file is free software; the Free Software Foundation
11 # gives unlimited permission to copy and/or distribute it,
12 # with or without modifications, as long as this notice is preserved.
14 AC_DEFUN([gl_FUNC_NANOSLEEP],
16 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
17 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
19 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
20 AC_REQUIRE([gl_CLOCK_TIME])
21 AC_CHECK_HEADERS_ONCE([sys/time.h])
23 nanosleep_save_libs=$LIBS
25 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
26 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
27 AC_SEARCH_LIBS([nanosleep], [rt posix4],
28 [test "$ac_cv_search_nanosleep" = "none required" ||
29 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
31 AC_REQUIRE([gl_MULTIARCH])
32 if test $APPLE_UNIVERSAL_BUILD = 1; then
33 # A universal build on Apple MacOS X platforms.
34 # The test result would be 'no (mishandles large arguments)' in 64-bit mode
35 # but 'yes' in 32-bit mode. But we need a configuration result that is
36 # valid in both modes.
37 gl_cv_func_nanosleep='no (mishandles large arguments)'
40 AC_CACHE_CHECK([for working nanosleep],
41 [gl_cv_func_nanosleep],
53 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
54 #define TYPE_MAXIMUM(t) \
55 ((t) (! TYPE_SIGNED (t) \
57 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
60 check_for_SIGALRM (int sig)
69 static struct timespec ts_sleep;
70 static struct timespec ts_remaining;
71 static struct sigaction act;
74 act.sa_handler = check_for_SIGALRM;
75 sigemptyset (&act.sa_mask);
76 sigaction (SIGALRM, &act, NULL);
80 if (nanosleep (&ts_sleep, NULL) != 0)
82 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
83 ts_sleep.tv_nsec = 999999999;
85 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
86 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
90 [gl_cv_func_nanosleep=yes],
92 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
93 *) gl_cv_func_nanosleep=no;;
95 [gl_cv_func_nanosleep=cross-compiling])
97 if test "$gl_cv_func_nanosleep" = yes; then
101 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
102 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
103 [Define to 1 if nanosleep mishandles large arguments.])
104 for ac_lib in $LIB_CLOCK_GETTIME; do
105 case " $LIB_NANOSLEEP " in
107 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
111 AC_LIBOBJ([nanosleep])
115 AC_SUBST([LIB_NANOSLEEP])
116 LIBS=$nanosleep_save_libs
119 # Prerequisites of lib/nanosleep.c.
120 AC_DEFUN([gl_PREREQ_NANOSLEEP],
122 AC_CHECK_HEADERS_ONCE([sys/select.h])
123 gl_PREREQ_SIG_HANDLER_H