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- # serial 28
- # Copyright (C) 2001-2003, 2005, 2007, 2009-2021 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.
- dnl From Jim Meyering.
- AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
- [
- AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
- AC_REQUIRE([AC_C_RESTRICT])
- AC_REQUIRE([AC_CANONICAL_HOST])
- AC_REQUIRE([gl_HEADER_SYS_TIME_H])
- AC_CHECK_FUNCS_ONCE([gettimeofday])
- gl_gettimeofday_timezone=void
- if test $ac_cv_func_gettimeofday != yes; then
- HAVE_GETTIMEOFDAY=0
- else
- AC_CACHE_CHECK([for gettimeofday with POSIX signature],
- [gl_cv_func_gettimeofday_posix_signature],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <sys/time.h>
- struct timeval c;
- int gettimeofday (struct timeval *restrict, void *restrict);
- ]],
- [[/* glibc uses struct timezone * rather than the POSIX void *
- if _GNU_SOURCE is defined. However, since the only portable
- use of gettimeofday uses NULL as the second parameter, and
- since the glibc definition is actually more typesafe, it is
- not worth wrapping this to get a compliant signature. */
- int (*f) (struct timeval *restrict, void *restrict)
- = gettimeofday;
- int x = f (&c, 0);
- return !(x | c.tv_sec | c.tv_usec);
- ]])],
- [gl_cv_func_gettimeofday_posix_signature=yes],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <sys/time.h>
- int gettimeofday (struct timeval *restrict, struct timezone *restrict);
- ]])],
- [gl_cv_func_gettimeofday_posix_signature=almost],
- [gl_cv_func_gettimeofday_posix_signature=no])])])
- if test $gl_cv_func_gettimeofday_posix_signature = almost; then
- gl_gettimeofday_timezone='struct timezone'
- elif test $gl_cv_func_gettimeofday_posix_signature != yes; then
- REPLACE_GETTIMEOFDAY=1
- fi
- dnl If we override 'struct timeval', we also have to override gettimeofday.
- if test $REPLACE_STRUCT_TIMEVAL = 1; then
- REPLACE_GETTIMEOFDAY=1
- fi
- dnl On mingw, the original gettimeofday has only a precision of 15.6
- dnl milliseconds. So override it.
- case "$host_os" in
- mingw*) REPLACE_GETTIMEOFDAY=1 ;;
- esac
- fi
- AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone],
- [Define this to 'void' or 'struct timezone' to match the system's
- declaration of the second argument to gettimeofday.])
- ])
- # Prerequisites of lib/gettimeofday.c.
- AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [:])
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