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Annotation of kernel/bsd/sys/time.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)time.h      8.5 (Berkeley) 5/4/95
        !            59:  */
        !            60: 
        !            61: #ifndef _SYS_TIME_H_
        !            62: #define _SYS_TIME_H_
        !            63: 
        !            64: #include <sys/types.h>
        !            65: 
        !            66: /*
        !            67:  * Structure returned by gettimeofday(2) system call,
        !            68:  * and used in other calls.
        !            69:  */
        !            70: struct timeval {
        !            71:        int32_t tv_sec;         /* seconds */
        !            72:        int32_t tv_usec;        /* and microseconds */
        !            73: };
        !            74: 
        !            75: /*
        !            76:  * Structure defined by POSIX.4 to be like a timeval.
        !            77:  */
        !            78: struct timespec {
        !            79:        time_t  tv_sec;         /* seconds */
        !            80:        int32_t tv_nsec;        /* and nanoseconds */
        !            81: };
        !            82: 
        !            83: #define        TIMEVAL_TO_TIMESPEC(tv, ts) {                                   \
        !            84:        (ts)->tv_sec = (tv)->tv_sec;                                    \
        !            85:        (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
        !            86: }
        !            87: #define        TIMESPEC_TO_TIMEVAL(tv, ts) {                                   \
        !            88:        (tv)->tv_sec = (ts)->tv_sec;                                    \
        !            89:        (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
        !            90: }
        !            91: 
        !            92: struct timezone {
        !            93:        int     tz_minuteswest; /* minutes west of Greenwich */
        !            94:        int     tz_dsttime;     /* type of dst correction */
        !            95: };
        !            96: #define        DST_NONE        0       /* not on dst */
        !            97: #define        DST_USA         1       /* USA style dst */
        !            98: #define        DST_AUST        2       /* Australian style dst */
        !            99: #define        DST_WET         3       /* Western European dst */
        !           100: #define        DST_MET         4       /* Middle European dst */
        !           101: #define        DST_EET         5       /* Eastern European dst */
        !           102: #define        DST_CAN         6       /* Canada */
        !           103: 
        !           104: /* Operations on timevals. */
        !           105: #define        timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
        !           106: #define        timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
        !           107: #define        timercmp(tvp, uvp, cmp)                                         \
        !           108:        (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
        !           109:            ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
        !           110:            ((tvp)->tv_sec cmp (uvp)->tv_sec))
        !           111: #define        timeradd(tvp, uvp, vvp)                                         \
        !           112:        do {                                                            \
        !           113:                (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
        !           114:                (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
        !           115:                if ((vvp)->tv_usec >= 1000000) {                        \
        !           116:                        (vvp)->tv_sec++;                                \
        !           117:                        (vvp)->tv_usec -= 1000000;                      \
        !           118:                }                                                       \
        !           119:        } while (0)
        !           120: #define        timersub(tvp, uvp, vvp)                                         \
        !           121:        do {                                                            \
        !           122:                (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
        !           123:                (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
        !           124:                if ((vvp)->tv_usec < 0) {                               \
        !           125:                        (vvp)->tv_sec--;                                \
        !           126:                        (vvp)->tv_usec += 1000000;                      \
        !           127:                }                                                       \
        !           128:        } while (0)
        !           129: 
        !           130: /*
        !           131:  * Names of the interval timers, and structure
        !           132:  * defining a timer setting.
        !           133:  */
        !           134: #define        ITIMER_REAL     0
        !           135: #define        ITIMER_VIRTUAL  1
        !           136: #define        ITIMER_PROF     2
        !           137: 
        !           138: struct itimerval {
        !           139:        struct  timeval it_interval;    /* timer interval */
        !           140:        struct  timeval it_value;       /* current value */
        !           141: };
        !           142: 
        !           143: /*
        !           144:  * Getkerninfo clock information structure
        !           145:  */
        !           146: struct clockinfo {
        !           147:        int     hz;             /* clock frequency */
        !           148:        int     tick;           /* micro-seconds per hz tick */
        !           149:        int     tickadj;        /* clock skew rate for adjtime() */
        !           150:        int     stathz;         /* statistics clock frequency */
        !           151:        int     profhz;         /* profiling clock frequency */
        !           152: };
        !           153: 
        !           154: #include <sys/cdefs.h>
        !           155: 
        !           156: #ifdef _KERNEL
        !           157: int    itimerfix __P((struct timeval *tv));
        !           158: int    itimerdecr __P((struct itimerval *itp, int usec));
        !           159: void   microtime __P((struct timeval *tv));
        !           160: #else /* !_KERNEL */
        !           161: #include <time.h>
        !           162: 
        !           163: #ifndef _POSIX_SOURCE
        !           164: #include <sys/cdefs.h>
        !           165: 
        !           166: __BEGIN_DECLS
        !           167: int    adjtime __P((const struct timeval *, struct timeval *));
        !           168: int    getitimer __P((int, struct itimerval *));
        !           169: int    gettimeofday __P((struct timeval *, struct timezone *));
        !           170: int    setitimer __P((int, const struct itimerval *, struct itimerval *));
        !           171: int    settimeofday __P((const struct timeval *, const struct timezone *));
        !           172: int    utimes __P((const char *, const struct timeval *));
        !           173: __END_DECLS
        !           174: #endif /* !POSIX */
        !           175: 
        !           176: #endif /* !_KERNEL */
        !           177: 
        !           178: #endif /* !_SYS_TIME_H_ */

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