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=$LIBS
25 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
26 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
28 AC_SEARCH_LIBS([nanosleep], [rt posix4],
29 [test "$ac_cv_search_nanosleep" = "none required" ||
30 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
32 AC_REQUIRE([gl_MULTIARCH])
33 if test $APPLE_UNIVERSAL_BUILD = 1; then
34 # A universal build on Apple MacOS X platforms.
35 # The test result would be 'no (mishandles large arguments)' in 64-bit mode
36 # but 'yes' in 32-bit mode. But we need a configuration result that is
37 # valid in both modes.
38 gl_cv_func_nanosleep='no (mishandles large arguments)'
41 AC_CACHE_CHECK([for working nanosleep],
42 [gl_cv_func_nanosleep],
54 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
55 #define TYPE_MAXIMUM(t) \
56 ((t) (! TYPE_SIGNED (t) \
58 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
61 check_for_SIGALRM (int sig)
70 static struct timespec ts_sleep;
71 static struct timespec ts_remaining;
72 static struct sigaction act;
75 act.sa_handler = check_for_SIGALRM;
76 sigemptyset (&act.sa_mask);
77 sigaction (SIGALRM, &act, NULL);
81 if (nanosleep (&ts_sleep, NULL) != 0)
83 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
84 ts_sleep.tv_nsec = 999999999;
86 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
87 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
91 [gl_cv_func_nanosleep=yes],
93 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
94 *) gl_cv_func_nanosleep=no;;
96 [gl_cv_func_nanosleep=cross-compiling])
98 if test "$gl_cv_func_nanosleep" = yes; then
102 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
103 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
104 [Define to 1 if nanosleep mishandles large arguments.])
105 for ac_lib in $LIB_CLOCK_GETTIME; do
106 case " $LIB_NANOSLEEP " in
108 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
112 AC_LIBOBJ([nanosleep])
116 AC_SUBST([LIB_NANOSLEEP])
117 LIBS=$nanosleep_save_libs
120 # Prerequisites of lib/nanosleep.c.
121 AC_DEFUN([gl_PREREQ_NANOSLEEP],
123 AC_CHECK_HEADERS_ONCE([sys/select.h])
124 gl_PREREQ_SIG_HANDLER_H