1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
# serial 39
dnl From Jim Meyering.
dnl Check for the nanosleep function.
dnl If not found, use the supplied replacement.
dnl
# Copyright (C) 1999-2001, 2003-2020 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],
[
AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS_ONCE([sys/time.h])
AC_REQUIRE([gl_FUNC_SELECT])
AC_CHECK_DECLS_ONCE([alarm])
nanosleep_save_libs=$LIBS
# Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
# Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
LIB_NANOSLEEP=
AC_SUBST([LIB_NANOSLEEP])
AC_SEARCH_LIBS([nanosleep], [rt posix4],
[test "$ac_cv_search_nanosleep" = "none required" ||
LIB_NANOSLEEP=$ac_cv_search_nanosleep])
if test "x$ac_cv_search_nanosleep" != xno; then
dnl The system has a nanosleep function.
AC_REQUIRE([gl_MULTIARCH])
if test $APPLE_UNIVERSAL_BUILD = 1; then
# A universal build on Apple Mac OS X platforms.
# The test result would be 'no (mishandles large arguments)' in 64-bit
# mode but 'yes' in 32-bit mode. But we need a configuration result that
# is valid in both modes.
gl_cv_func_nanosleep='no (mishandles large arguments)'
fi
AC_CACHE_CHECK([for working nanosleep],
[gl_cv_func_nanosleep],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <errno.h>
#include <limits.h>
#include <signal.h>
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>
#include <unistd.h>
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
#define TYPE_MAXIMUM(t) \
((t) (! TYPE_SIGNED (t) \
? (t) -1 \
: ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
#if HAVE_DECL_ALARM
static void
check_for_SIGALRM (int sig)
{
if (sig != SIGALRM)
_exit (1);
}
#endif
int
main ()
{
static struct timespec ts_sleep;
static struct timespec ts_remaining;
/* Test for major problems first. */
if (! nanosleep)
return 2;
ts_sleep.tv_sec = 0;
ts_sleep.tv_nsec = 1;
#if HAVE_DECL_ALARM
{
static struct sigaction act;
act.sa_handler = check_for_SIGALRM;
sigemptyset (&act.sa_mask);
sigaction (SIGALRM, &act, NULL);
alarm (1);
if (nanosleep (&ts_sleep, NULL) != 0)
return 3;
/* Test for a minor problem: the handling of large arguments. */
ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
ts_sleep.tv_nsec = 999999999;
alarm (1);
if (nanosleep (&ts_sleep, &ts_remaining) != -1)
return 4;
if (errno != EINTR)
return 5;
if (ts_remaining.tv_sec <= TYPE_MAXIMUM (time_t) - 10)
return 6;
}
#else /* A simpler test for native Windows. */
if (nanosleep (&ts_sleep, &ts_remaining) < 0)
return 3;
#endif
return 0;
}]])],
[gl_cv_func_nanosleep=yes],
[case $? in dnl (
4|5|6) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
*) gl_cv_func_nanosleep=no;;
esac],
[case "$host_os" in dnl ((
linux*) # Guess it halfway works when the kernel is Linux.
gl_cv_func_nanosleep='guessing no (mishandles large arguments)' ;;
mingw*) # Guess no on native Windows.
gl_cv_func_nanosleep='guessing no' ;;
*) # If we don't know, obey --enable-cross-guesses.
gl_cv_func_nanosleep="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_nanosleep" in
*yes)
REPLACE_NANOSLEEP=0
;;
*)
REPLACE_NANOSLEEP=1
case "$gl_cv_func_nanosleep" in
*"mishandles large arguments"*)
AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
[Define to 1 if nanosleep mishandles large arguments.])
;;
*)
# The replacement uses select(). Add $LIBSOCKET to $LIB_NANOSLEEP.
for ac_lib in $LIBSOCKET; do
case " $LIB_NANOSLEEP " in
*" $ac_lib "*) ;;
*) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
esac
done
;;
esac
;;
esac
else
HAVE_NANOSLEEP=0
fi
LIBS=$nanosleep_save_libs
])
# Prerequisites of lib/nanosleep.c.
AC_DEFUN([gl_PREREQ_NANOSLEEP],
[
AC_CHECK_HEADERS_ONCE([sys/select.h])
gl_PREREQ_SIG_HANDLER_H
])
|
