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