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Annotation of embedaddon/ntp/lib/isc/unix/stdtime.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
                      3:  * Copyright (C) 1999-2001  Internet Software Consortium.
                      4:  *
                      5:  * Permission to use, copy, modify, and/or distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
                     10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
                     11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
                     12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
                     13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
                     14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
                     15:  * PERFORMANCE OF THIS SOFTWARE.
                     16:  */
                     17: 
                     18: /* $Id: stdtime.c,v 1.19 2007/06/19 23:47:18 tbox Exp $ */
                     19: 
                     20: /*! \file */
                     21: 
                     22: #include <config.h>
                     23: 
                     24: #include <stddef.h>    /* NULL */
                     25: #include <stdlib.h>    /* NULL */
                     26: #include <syslog.h>
                     27: 
                     28: #include <sys/time.h>
                     29: 
                     30: #include <isc/stdtime.h>
                     31: #include <isc/util.h>
                     32: 
                     33: #ifndef ISC_FIX_TV_USEC
                     34: #define ISC_FIX_TV_USEC 1
                     35: #endif
                     36: 
                     37: #define US_PER_S 1000000
                     38: 
                     39: #if ISC_FIX_TV_USEC
                     40: static inline void
                     41: fix_tv_usec(struct timeval *tv) {
                     42:        isc_boolean_t fixed = ISC_FALSE;
                     43: 
                     44:        if (tv->tv_usec < 0) {
                     45:                fixed = ISC_TRUE;
                     46:                do {
                     47:                        tv->tv_sec -= 1;
                     48:                        tv->tv_usec += US_PER_S;
                     49:                } while (tv->tv_usec < 0);
                     50:        } else if (tv->tv_usec >= US_PER_S) {
                     51:                fixed = ISC_TRUE;
                     52:                do {
                     53:                        tv->tv_sec += 1;
                     54:                        tv->tv_usec -= US_PER_S;
                     55:                } while (tv->tv_usec >=US_PER_S);
                     56:        }
                     57:        /*
                     58:         * Call syslog directly as we are called from the logging functions.
                     59:         */
                     60:        if (fixed)
                     61:                (void)syslog(LOG_ERR, "gettimeofday returned bad tv_usec: corrected");
                     62: }
                     63: #endif
                     64: 
                     65: void
                     66: isc_stdtime_get(isc_stdtime_t *t) {
                     67:        struct timeval tv;
                     68: 
                     69:        /*
                     70:         * Set 't' to the number of seconds since 00:00:00 UTC, January 1,
                     71:         * 1970.
                     72:         */
                     73: 
                     74:        REQUIRE(t != NULL);
                     75: 
                     76:        RUNTIME_CHECK(gettimeofday(&tv, NULL) != -1);
                     77: 
                     78: #if ISC_FIX_TV_USEC
                     79:        fix_tv_usec(&tv);
                     80:        INSIST(tv.tv_usec >= 0);
                     81: #else
                     82:        INSIST(tv.tv_usec >= 0 && tv.tv_usec < US_PER_S);
                     83: #endif
                     84: 
                     85:        *t = (unsigned int)tv.tv_sec;
                     86: }