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_CHECK_HEADERS_ONCE([sys/time.h])
21 AC_REQUIRE([gl_FUNC_SELECT])
23 nanosleep_save_libs=$LIBS
25 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
26 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
28 AC_SUBST([LIB_NANOSLEEP])
29 AC_SEARCH_LIBS([nanosleep], [rt posix4],
30 [test "$ac_cv_search_nanosleep" = "none required" ||
31 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
33 AC_REQUIRE([gl_MULTIARCH])
34 if test $APPLE_UNIVERSAL_BUILD = 1; then
35 # A universal build on Apple MacOS X platforms.
36 # The test result would be 'no (mishandles large arguments)' in 64-bit mode
37 # but 'yes' in 32-bit mode. But we need a configuration result that is
38 # valid in both modes.
39 gl_cv_func_nanosleep='no (mishandles large arguments)'
42 AC_CACHE_CHECK([for working nanosleep],
43 [gl_cv_func_nanosleep],
55 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
56 #define TYPE_MAXIMUM(t) \
57 ((t) (! TYPE_SIGNED (t) \
59 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
62 check_for_SIGALRM (int sig)
71 static struct timespec ts_sleep;
72 static struct timespec ts_remaining;
73 static struct sigaction act;
76 act.sa_handler = check_for_SIGALRM;
77 sigemptyset (&act.sa_mask);
78 sigaction (SIGALRM, &act, NULL);
82 if (nanosleep (&ts_sleep, NULL) != 0)
84 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
85 ts_sleep.tv_nsec = 999999999;
87 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
88 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
92 [gl_cv_func_nanosleep=yes],
94 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
95 *) gl_cv_func_nanosleep=no;;
97 [gl_cv_func_nanosleep=cross-compiling])
99 if test "$gl_cv_func_nanosleep" = yes; then
103 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
104 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
105 [Define to 1 if nanosleep mishandles large arguments.])
107 for ac_lib in $LIBSOCKET; do
108 case " $LIB_NANOSLEEP " in
110 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
114 AC_LIBOBJ([nanosleep])
118 LIBS=$nanosleep_save_libs
121 # Prerequisites of lib/nanosleep.c.
122 AC_DEFUN([gl_PREREQ_NANOSLEEP],
124 AC_CHECK_HEADERS_ONCE([sys/select.h])
125 gl_PREREQ_SIG_HANDLER_H