| 1 | dnl Check:
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| 2 | dnl * If we have gettimeofday;
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| 3 | dnl * If we have struct timezone for use in calling it;
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| 4 | dnl * If calling it with a timezone pointer actually works -- this is deemed
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| 5 | dnl obsolete or undefined on some systems which say you should use a null
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| 6 | dnl pointer -- and undefine HAVE_TIMEZONE if so;
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| 7 | dnl * Whether it only takes one arg.
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| 8 | AC_DEFUN(LIBU77_GETTIMEOFDAY, [
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| 9 | AC_CHECK_FUNCS(gettimeofday)
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| 10 | if test "$ac_cv_func_gettimeofday" = yes; then
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| 11 | AC_CACHE_CHECK([for struct timezone], g77_cv_struct_timezone,
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| 12 | [AC_TRY_COMPILE([#include <sys/time.h>],
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| 13 | [struct timezone tz;],
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| 14 | g77_cv_struct_timezone=yes, g77_cv_struct_timezone=no)])
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| 15 | if test $g77_cv_struct_timezone = yes; then
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| 16 | dnl It may be that we can't call gettimeofday with a non-null pointer.
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| 17 | dnl In that case we'll lie about struct timezone.
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| 18 | AC_TRY_RUN([
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| 19 | #ifdef TIME_WITH_SYS_TIME
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| 20 | #include <sys/time.h>
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| 21 | #include <time.h>
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| 22 | #else
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| 23 | #ifdef HAVE_SYS_TIME_H
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| 24 | #include <sys/time.h>
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| 25 | #else
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| 26 | #include <time.h>
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| 27 | #endif
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| 28 | #endif
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| 29 | main ()
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| 30 | {
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| 31 | struct timeval time;
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| 32 | struct timezone dummy;
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| 33 | if (gettimeofday (&time, &dummy))
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| 34 | exit (1);
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| 35 | else
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| 36 | exit (0);
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| 37 | }],
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| 38 | [AC_DEFINE(HAVE_TIMEZONE)], ,[AC_DEFINE(HAVE_TIMEZONE)])
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| 39 | fi
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| 40 | AC_REQUIRE([AC_HEADER_TIME])
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| 41 | AC_CACHE_CHECK(whether gettimeofday can accept two arguments,
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| 42 | emacs_cv_gettimeofday_two_arguments,
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| 43 | AC_TRY_LINK([
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| 44 | #ifdef TIME_WITH_SYS_TIME
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| 45 | #include <sys/time.h>
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| 46 | #include <time.h>
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| 47 | #else
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| 48 | #ifdef HAVE_SYS_TIME_H
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| 49 | #include <sys/time.h>
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| 50 | #else
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| 51 | #include <time.h>
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| 52 | #endif
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| 53 | #endif
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| 54 | ],
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| 55 | [
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| 56 | struct timeval time;
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| 57 | #ifdef HAVE_TIMEZONE
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| 58 | struct timezone dummy;
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| 59 | #define DUMMY &dummy
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| 60 | #else
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| 61 | #define DUMMY NULL
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| 62 | #endif
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| 63 | gettimeofday (&time, DUMMY);],
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| 64 | emacs_cv_gettimeofday_two_arguments=yes,
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| 65 | emacs_cv_gettimeofday_two_arguments=no))
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| 66 | if test $emacs_cv_gettimeofday_two_arguments = no; then
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| 67 | AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT)
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| 68 | fi
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| 69 | fi])
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