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1 office 1 # Configure a replacement for <sys/time.h>.
2 # serial 8
3  
4 # Copyright (C) 2007, 2009-2016 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
8  
9 # Written by Paul Eggert and Martin Lambers.
10  
11 AC_DEFUN([gl_HEADER_SYS_TIME_H],
12 [
13 dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
14 dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
15 dnl statements that occur in other macros.
16 AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
17 ])
18  
19 AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
20 [
21 AC_REQUIRE([AC_C_RESTRICT])
22 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
23 AC_CHECK_HEADERS_ONCE([sys/time.h])
24 gl_CHECK_NEXT_HEADERS([sys/time.h])
25  
26 if test $ac_cv_header_sys_time_h != yes; then
27 HAVE_SYS_TIME_H=0
28 fi
29  
30 dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>
31 dnl only. So include that header in the list.
32 gl_PREREQ_SYS_H_WINSOCK2
33 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
34 [AC_COMPILE_IFELSE(
35 [AC_LANG_PROGRAM(
36 [[#if HAVE_SYS_TIME_H
37 #include <sys/time.h>
38 #endif
39 #include <time.h>
40 #if HAVE_WINSOCK2_H
41 # include <winsock2.h>
42 #endif
43 ]],
44 [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
45 [gl_cv_sys_struct_timeval=yes],
46 [gl_cv_sys_struct_timeval=no])
47 ])
48 if test $gl_cv_sys_struct_timeval != yes; then
49 HAVE_STRUCT_TIMEVAL=0
50 else
51 dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined
52 dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only
53 dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is
54 dnl smaller than the 'time_t' type mandated by POSIX.
55 dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but
56 dnl that is good enough.
57 AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member],
58 [gl_cv_sys_struct_timeval_tv_sec],
59 [AC_COMPILE_IFELSE(
60 [AC_LANG_PROGRAM(
61 [[#if HAVE_SYS_TIME_H
62 #include <sys/time.h>
63 #endif
64 #include <time.h>
65 #if HAVE_WINSOCK2_H
66 # include <winsock2.h>
67 #endif
68 ]],
69 [[static struct timeval x;
70 typedef int verify_tv_sec_type[
71 sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1
72 ];
73 ]])],
74 [gl_cv_sys_struct_timeval_tv_sec=yes],
75 [gl_cv_sys_struct_timeval_tv_sec=no])
76 ])
77 if test $gl_cv_sys_struct_timeval_tv_sec != yes; then
78 REPLACE_STRUCT_TIMEVAL=1
79 fi
80 fi
81  
82 dnl Check for declarations of anything we want to poison if the
83 dnl corresponding gnulib module is not in use.
84 gl_WARN_ON_USE_PREPARE([[
85 #if HAVE_SYS_TIME_H
86 # include <sys/time.h>
87 #endif
88 #include <time.h>
89 ]], [gettimeofday])
90 ])
91  
92 AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
93 [
94 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
95 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
96 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
97 dnl Define it also as a C macro, for the benefit of the unit tests.
98 gl_MODULE_INDICATOR_FOR_TESTS([$1])
99 ])
100  
101 AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
102 [
103 GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY])
104 dnl Assume POSIX behavior unless another module says otherwise.
105 HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
106 HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
107 HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
108 HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T])
109 REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])
110 REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL])
111 ])