# Configure a replacement for <sys/time.h>.

# serial 9

# Copyright (C) 2007, 2009-2018 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.

# Written by Paul Eggert and Martin Lambers.

AC_DEFUN([gl_HEADER_SYS_TIME_H],

[

  dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement

  dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1

  dnl statements that occur in other macros.

  AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])

])

AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],

[

  AC_REQUIRE([AC_C_RESTRICT])

  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])

  AC_CHECK_HEADERS_ONCE([sys/time.h])

  gl_CHECK_NEXT_HEADERS([sys/time.h])

  if test $ac_cv_header_sys_time_h != yes; then

    HAVE_SYS_TIME_H=0

  fi

  dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>

  dnl only. So include that header in the list.

  gl_PREREQ_SYS_H_WINSOCK2

  AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],

    [AC_COMPILE_IFELSE(

       [AC_LANG_PROGRAM(

          [[#if HAVE_SYS_TIME_H

             #include <sys/time.h>

            #endif

            #include <time.h>

            #if HAVE_WINSOCK2_H

            # include <winsock2.h>

            #endif

          ]],

          [[static struct timeval x; x.tv_sec = x.tv_usec;]])],

       [gl_cv_sys_struct_timeval=yes],

       [gl_cv_sys_struct_timeval=no])

    ])

  if test $gl_cv_sys_struct_timeval != yes; then

    HAVE_STRUCT_TIMEVAL=0

  else

    dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined

    dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only

    dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is

    dnl smaller than the 'time_t' type mandated by POSIX.

    dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but

    dnl that is good enough.

    AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member],

      [gl_cv_sys_struct_timeval_tv_sec],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM(

            [[#if HAVE_SYS_TIME_H

               #include <sys/time.h>

              #endif

              #include <time.h>

              #if HAVE_WINSOCK2_H

              # include <winsock2.h>

              #endif

            ]],

            [[static struct timeval x;

              typedef int verify_tv_sec_type[

                sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1

              ];

            ]])],

         [gl_cv_sys_struct_timeval_tv_sec=yes],

         [gl_cv_sys_struct_timeval_tv_sec=no])

      ])

    if test $gl_cv_sys_struct_timeval_tv_sec != yes; then

      REPLACE_STRUCT_TIMEVAL=1

    fi

  fi

  dnl Check for declarations of anything we want to poison if the

  dnl corresponding gnulib module is not in use.

  gl_WARN_ON_USE_PREPARE([[

#if HAVE_SYS_TIME_H

# include <sys/time.h>

#endif

#include <time.h>

    ]], [gettimeofday])

])

AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])

  gl_MODULE_INDICATOR_SET_VARIABLE([$1])

  dnl Define it also as a C macro, for the benefit of the unit tests.

  gl_MODULE_INDICATOR_FOR_TESTS([$1])

])

AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],

[

  GNULIB_GETTIMEOFDAY=0;     AC_SUBST([GNULIB_GETTIMEOFDAY])

  dnl Assume POSIX behavior unless another module says otherwise.

  HAVE_GETTIMEOFDAY=1;       AC_SUBST([HAVE_GETTIMEOFDAY])

  HAVE_STRUCT_TIMEVAL=1;     AC_SUBST([HAVE_STRUCT_TIMEVAL])

  HAVE_SYS_TIME_H=1;         AC_SUBST([HAVE_SYS_TIME_H])

  REPLACE_GETTIMEOFDAY=0;    AC_SUBST([REPLACE_GETTIMEOFDAY])

  REPLACE_STRUCT_TIMEVAL=0;  AC_SUBST([REPLACE_STRUCT_TIMEVAL])

])