4 dnl Check for the nanosleep function.
5 dnl If not found, use the supplied replacement.
8 # Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007 Free
9 # Software Foundation, Inc.
11 # This file is free software; the Free Software Foundation
12 # gives unlimited permission to copy and/or distribute it,
13 # with or without modifications, as long as this notice is preserved.
15 AC_DEFUN([gl_FUNC_NANOSLEEP],
17 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
18 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
20 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
21 AC_REQUIRE([gl_CLOCK_TIME])
22 AC_CHECK_HEADERS_ONCE(sys/time.h)
24 nanosleep_save_libs=$LIBS
26 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
27 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
28 AC_SEARCH_LIBS([nanosleep], [rt posix4],
29 [test "$ac_cv_search_nanosleep" = "none required" ||
30 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
32 AC_CACHE_CHECK([for working nanosleep],
33 [gl_cv_func_nanosleep],
45 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
46 #define TYPE_MAXIMUM(t) \
47 ((t) (! TYPE_SIGNED (t) \
49 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
52 check_for_SIGALRM (int sig)
61 static struct timespec ts_sleep;
62 static struct timespec ts_remaining;
63 static struct sigaction act;
66 act.sa_handler = check_for_SIGALRM;
67 sigemptyset (&act.sa_mask);
68 sigaction (SIGALRM, &act, NULL);
72 if (nanosleep (&ts_sleep, NULL) != 0)
74 ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
75 ts_sleep.tv_nsec = 999999999;
77 if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
78 && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
82 [gl_cv_func_nanosleep=yes],
84 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
85 *) gl_cv_func_nanosleep=no;;
87 [gl_cv_func_nanosleep=cross-compiling])
89 if test "$gl_cv_func_nanosleep" = yes; then
93 if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
94 AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], 1,
95 [Define to 1 if nanosleep mishandle large arguments.])
96 for ac_lib in $LIB_CLOCK_GETTIME; do
97 case " $LIB_NANOSLEEP " in
99 *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
107 AC_SUBST([LIB_NANOSLEEP])
108 LIBS=$nanosleep_save_libs
111 # Prerequisites of lib/nanosleep.c.
112 AC_DEFUN([gl_PREREQ_NANOSLEEP],
114 AC_CHECK_FUNCS_ONCE(siginterrupt)
115 AC_CHECK_HEADERS_ONCE(sys/select.h)