usr/src/lib/gss_mechs/mech_krb5/krb5/os/ustime.c

   1 /*
   2  * lib/krb5/os/ustime.c
   3  *
   4  * Copyright 1990,1991 by the Massachusetts Institute of Technology.
   5  * All Rights Reserved.
   6  *
   7  * Export of this software from the United States of America may
   8  *   require a specific license from the United States Government.
   9  *   It is the responsibility of any person or organization contemplating
  10  *   export to obtain such a license before exporting.
  11  *
  12  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  13  * distribute this software and its documentation for any purpose and
  14  * without fee is hereby granted, provided that the above copyright
  15  * notice appear in all copies and that both that copyright notice and
  16  * this permission notice appear in supporting documentation, and that
  17  * the name of M.I.T. not be used in advertising or publicity pertaining
  18  * to distribution of the software without specific, written prior
  19  * permission.  Furthermore if you modify this software you must label
  20  * your software as modified software and not distribute it in such a
  21  * fashion that it might be confused with the original M.I.T. software.
  22  * M.I.T. makes no representations about the suitability of
  23  * this software for any purpose.  It is provided "as is" without express
  24  * or implied warranty.
  25  *
  26  * krb5_crypto_us_timeofday() does all of the real work; however, we
  27  * handle the time offset adjustment here, since this is context
  28  * specific, and the crypto version of this call doesn't have access
  29  * to the context variable.  Fortunately the only user of
  30  * krb5_crypto_us_timeofday in the crypto library doesn't require that
  31  * this time adjustment be done.
  32  */
  33
  34 #include "k5-int.h"
  35
  36 krb5_error_code KRB5_CALLCONV
  37 krb5_us_timeofday(krb5_context context, krb5_timestamp *seconds, krb5_int32 *microseconds)
  38 {
  39     krb5_os_context os_ctx = context->os_context;
  40     krb5_int32 sec, usec;
  41     krb5_error_code retval;
  42
  43     if (os_ctx->os_flags & KRB5_OS_TOFFSET_TIME) {
  44             *seconds = os_ctx->time_offset;
  45             *microseconds = os_ctx->usec_offset;
  46             return 0;
  47     }
  48     retval = krb5_crypto_us_timeofday(&sec, &usec);
  49     if (retval)
  50             return retval;
  51     if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID) {
  52             usec += os_ctx->usec_offset;
  53             if (usec > 1000000) {
  54                     usec -= 1000000;
  55                     sec++;
  56             }
  57             if (usec < 0) {
  58                 usec += 1000000;
  59                 sec--;
  60             }
  61             sec += os_ctx->time_offset;
  62     }
  63     *seconds = sec;
  64     *microseconds = usec;
  65     return 0;
  66 }