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7a6dbc2f | 1 | # serial 25 |
4a626d0a | 2 | |
7a6dbc2f | 3 | # Copyright (C) 2001-2003, 2005, 2007, 2009-2018 Free Software Foundation, Inc. |
4a626d0a PA |
4 | # This file is free software; the Free Software Foundation |
5 | # gives unlimited permission to copy and/or distribute it, | |
6 | # with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | dnl From Jim Meyering. | |
9 | ||
10 | AC_DEFUN([gl_FUNC_GETTIMEOFDAY], | |
11 | [ | |
7a6dbc2f | 12 | AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) |
4a626d0a | 13 | AC_REQUIRE([AC_C_RESTRICT]) |
7a6dbc2f | 14 | AC_REQUIRE([AC_CANONICAL_HOST]) |
4a626d0a | 15 | AC_REQUIRE([gl_HEADER_SYS_TIME_H]) |
4a626d0a PA |
16 | AC_CHECK_FUNCS_ONCE([gettimeofday]) |
17 | ||
18 | gl_gettimeofday_timezone=void | |
19 | if test $ac_cv_func_gettimeofday != yes; then | |
20 | HAVE_GETTIMEOFDAY=0 | |
21 | else | |
22 | gl_FUNC_GETTIMEOFDAY_CLOBBER | |
23 | AC_CACHE_CHECK([for gettimeofday with POSIX signature], | |
24 | [gl_cv_func_gettimeofday_posix_signature], | |
25 | [AC_COMPILE_IFELSE( | |
26 | [AC_LANG_PROGRAM( | |
27 | [[#include <sys/time.h> | |
28 | struct timeval c; | |
29 | int gettimeofday (struct timeval *restrict, void *restrict); | |
30 | ]], | |
31 | [[/* glibc uses struct timezone * rather than the POSIX void * | |
32 | if _GNU_SOURCE is defined. However, since the only portable | |
33 | use of gettimeofday uses NULL as the second parameter, and | |
34 | since the glibc definition is actually more typesafe, it is | |
35 | not worth wrapping this to get a compliant signature. */ | |
36 | int (*f) (struct timeval *restrict, void *restrict) | |
37 | = gettimeofday; | |
38 | int x = f (&c, 0); | |
39 | return !(x | c.tv_sec | c.tv_usec); | |
40 | ]])], | |
41 | [gl_cv_func_gettimeofday_posix_signature=yes], | |
42 | [AC_COMPILE_IFELSE( | |
43 | [AC_LANG_PROGRAM( | |
44 | [[#include <sys/time.h> | |
45 | int gettimeofday (struct timeval *restrict, struct timezone *restrict); | |
46 | ]])], | |
47 | [gl_cv_func_gettimeofday_posix_signature=almost], | |
48 | [gl_cv_func_gettimeofday_posix_signature=no])])]) | |
49 | if test $gl_cv_func_gettimeofday_posix_signature = almost; then | |
50 | gl_gettimeofday_timezone='struct timezone' | |
51 | elif test $gl_cv_func_gettimeofday_posix_signature != yes; then | |
52 | REPLACE_GETTIMEOFDAY=1 | |
53 | fi | |
54 | dnl If we override 'struct timeval', we also have to override gettimeofday. | |
55 | if test $REPLACE_STRUCT_TIMEVAL = 1; then | |
56 | REPLACE_GETTIMEOFDAY=1 | |
57 | fi | |
7a6dbc2f SDJ |
58 | dnl On mingw, the original gettimeofday has only a precision of 15.6 |
59 | dnl milliseconds. So override it. | |
60 | case "$host_os" in | |
61 | mingw*) REPLACE_GETTIMEOFDAY=1 ;; | |
62 | esac | |
4a626d0a PA |
63 | fi |
64 | AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone], | |
65 | [Define this to 'void' or 'struct timezone' to match the system's | |
66 | declaration of the second argument to gettimeofday.]) | |
67 | ]) | |
68 | ||
69 | ||
70 | dnl See if gettimeofday clobbers the static buffer that localtime uses | |
71 | dnl for its return value. The gettimeofday function from Mac OS X 10.0.4 | |
72 | dnl (i.e., Darwin 1.3.7) has this problem. | |
73 | dnl | |
74 | dnl If it does, then arrange to use gettimeofday and localtime only via | |
75 | dnl the wrapper functions that work around the problem. | |
76 | ||
77 | AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER], | |
78 | [ | |
79 | AC_REQUIRE([gl_HEADER_SYS_TIME_H]) | |
80 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
7a6dbc2f | 81 | AC_REQUIRE([gl_LOCALTIME_BUFFER_DEFAULTS]) |
4a626d0a PA |
82 | |
83 | AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer], | |
84 | [gl_cv_func_gettimeofday_clobber], | |
85 | [AC_RUN_IFELSE( | |
86 | [AC_LANG_PROGRAM( | |
87 | [[#include <string.h> | |
88 | #include <sys/time.h> | |
89 | #include <time.h> | |
90 | #include <stdlib.h> | |
91 | ]], | |
92 | [[ | |
93 | time_t t = 0; | |
94 | struct tm *lt; | |
95 | struct tm saved_lt; | |
96 | struct timeval tv; | |
97 | lt = localtime (&t); | |
98 | saved_lt = *lt; | |
99 | gettimeofday (&tv, NULL); | |
100 | return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0; | |
101 | ]])], | |
102 | [gl_cv_func_gettimeofday_clobber=no], | |
103 | [gl_cv_func_gettimeofday_clobber=yes], | |
104 | [# When cross-compiling: | |
105 | case "$host_os" in | |
7a6dbc2f SDJ |
106 | # Guess all is fine on glibc systems. |
107 | *-gnu* | gnu*) gl_cv_func_gettimeofday_clobber="guessing no" ;; | |
108 | # Guess no on native Windows. | |
109 | mingw*) gl_cv_func_gettimeofday_clobber="guessing no" ;; | |
110 | # If we don't know, assume the worst. | |
111 | *) gl_cv_func_gettimeofday_clobber="guessing yes" ;; | |
4a626d0a PA |
112 | esac |
113 | ])]) | |
114 | ||
115 | case "$gl_cv_func_gettimeofday_clobber" in | |
116 | *yes) | |
117 | REPLACE_GETTIMEOFDAY=1 | |
4a626d0a PA |
118 | AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1], |
119 | [Define if gettimeofday clobbers the localtime buffer.]) | |
7a6dbc2f | 120 | gl_LOCALTIME_BUFFER_NEEDED |
4a626d0a PA |
121 | ;; |
122 | esac | |
123 | ]) | |
124 | ||
4a626d0a | 125 | # Prerequisites of lib/gettimeofday.c. |
7a6dbc2f | 126 | AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [:]) |