| 1 | # serial 29
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| 2 |
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| 3 | # Copyright (C) 2001-2003, 2005, 2007, 2009-2021 Free Software Foundation, Inc.
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| 4 | # This file is free software; the Free Software Foundation
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| 5 | # gives unlimited permission to copy and/or distribute it,
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| 6 | # with or without modifications, as long as this notice is preserved.
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| 7 |
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| 8 | dnl From Jim Meyering.
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| 9 |
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| 10 | AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
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| 11 | [
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| 12 | AC_REQUIRE([gl_SYS_TIME_H_DEFAULTS])
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| 13 | AC_REQUIRE([AC_C_RESTRICT])
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 15 | AC_REQUIRE([gl_SYS_TIME_H])
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| 16 | AC_CHECK_FUNCS_ONCE([gettimeofday])
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| 17 |
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| 18 | gl_gettimeofday_timezone=void
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| 19 | if test $ac_cv_func_gettimeofday != yes; then
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| 20 | HAVE_GETTIMEOFDAY=0
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| 21 | else
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| 22 | AC_CACHE_CHECK([for gettimeofday with POSIX signature],
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| 23 | [gl_cv_func_gettimeofday_posix_signature],
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| 24 | [AC_COMPILE_IFELSE(
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| 25 | [AC_LANG_PROGRAM(
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| 26 | [[#include <sys/time.h>
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| 27 | struct timeval c;
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| 28 | int gettimeofday (struct timeval *restrict, void *restrict);
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| 29 | ]],
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| 30 | [[/* glibc uses struct timezone * rather than the POSIX void *
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| 31 | if _GNU_SOURCE is defined. However, since the only portable
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| 32 | use of gettimeofday uses NULL as the second parameter, and
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| 33 | since the glibc definition is actually more typesafe, it is
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| 34 | not worth wrapping this to get a compliant signature. */
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| 35 | int (*f) (struct timeval *restrict, void *restrict)
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| 36 | = gettimeofday;
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| 37 | int x = f (&c, 0);
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| 38 | return !(x | c.tv_sec | c.tv_usec);
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| 39 | ]])],
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| 40 | [gl_cv_func_gettimeofday_posix_signature=yes],
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| 41 | [AC_COMPILE_IFELSE(
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| 42 | [AC_LANG_PROGRAM(
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| 43 | [[#include <sys/time.h>
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| 44 | int gettimeofday (struct timeval *restrict, struct timezone *restrict);
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| 45 | ]])],
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| 46 | [gl_cv_func_gettimeofday_posix_signature=almost],
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| 47 | [gl_cv_func_gettimeofday_posix_signature=no])])])
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| 48 | if test $gl_cv_func_gettimeofday_posix_signature = almost; then
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| 49 | gl_gettimeofday_timezone='struct timezone'
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| 50 | elif test $gl_cv_func_gettimeofday_posix_signature != yes; then
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| 51 | REPLACE_GETTIMEOFDAY=1
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| 52 | fi
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| 53 | dnl If we override 'struct timeval', we also have to override gettimeofday.
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| 54 | if test $REPLACE_STRUCT_TIMEVAL = 1; then
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| 55 | REPLACE_GETTIMEOFDAY=1
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| 56 | fi
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| 57 | dnl On mingw, the original gettimeofday has only a precision of 15.6
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| 58 | dnl milliseconds. So override it.
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| 59 | case "$host_os" in
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| 60 | mingw*) REPLACE_GETTIMEOFDAY=1 ;;
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| 61 | esac
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| 62 | fi
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| 63 | AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone],
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| 64 | [Define this to 'void' or 'struct timezone' to match the system's
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| 65 | declaration of the second argument to gettimeofday.])
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| 66 | ])
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| 67 |
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| 68 | # Prerequisites of lib/gettimeofday.c.
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| 69 | AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [:])
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