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Annotation of 43BSDReno/lib/libc/sys/gettimeofday.2, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"    @(#)gettimeofday.2      6.10 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH GETTIMEOFDAY 2 "June 23, 1990"
        !            21: .UC 4
        !            22: .SH NAME
        !            23: gettimeofday, settimeofday \- get/set date and time
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .ft B
        !            27: #include <sys/time.h>
        !            28: .PP
        !            29: .ft B
        !            30: gettimeofday(tp, tzp)
        !            31: struct timeval *tp;
        !            32: struct timezone *tzp;
        !            33: .PP
        !            34: .ft B
        !            35: settimeofday(tp, tzp)
        !            36: struct timeval *tp;
        !            37: struct timezone *tzp;
        !            38: .fi
        !            39: .SH DESCRIPTION
        !            40: The system's notion of the current Greenwich time and the current time
        !            41: zone is obtained with the \fIgettimeofday\fP call, and set with the
        !            42: \fIsettimeofday\fP call.  The time is expressed in seconds and microseconds
        !            43: since midnight (0 hour), January 1, 1970.  The resolution of the system
        !            44: clock is hardware dependent, and the time may be updated continuously or
        !            45: in ``ticks.''  If \fItp\fP or \fItzp\fP is NULL, the associated time
        !            46: information will not be returned or set.
        !            47: .PP
        !            48: The structures pointed to by
        !            49: .I tp
        !            50: and
        !            51: .I tzp
        !            52: are defined in 
        !            53: .I <sys/time.h>
        !            54: as:
        !            55: .PP
        !            56: .nf
        !            57: .RS
        !            58: .DT
        !            59: struct timeval {
        !            60:        long    tv_sec;         /* seconds since Jan. 1, 1970 */
        !            61:        long    tv_usec;                /* and microseconds */
        !            62: };
        !            63: .sp 1
        !            64: struct timezone {
        !            65:        int     tz_minuteswest; /* of Greenwich */
        !            66:        int     tz_dsttime;     /* type of dst correction to apply */
        !            67: };
        !            68: .RE
        !            69: .fi
        !            70: .PP
        !            71: The 
        !            72: .I timezone
        !            73: structure indicates the local time zone
        !            74: (measured in minutes of time westward from Greenwich),
        !            75: and a flag that, if nonzero, indicates that
        !            76: Daylight Saving time applies locally during
        !            77: the appropriate part of the year.
        !            78: .PP
        !            79: Only the super-user may set the time of day or time zone.
        !            80: .SH RETURN
        !            81: A 0 return value indicates that the call succeeded.
        !            82: A \-1 return value indicates an error occurred, and in this
        !            83: case an error code is stored into the global variable \fIerrno\fP.
        !            84: .SH "ERRORS
        !            85: The following error codes may be set in \fIerrno\fP:
        !            86: .TP 15
        !            87: [EFAULT]
        !            88: An argument address referenced invalid memory.
        !            89: .TP 15
        !            90: [EPERM]
        !            91: A user other than the super-user attempted to set the time.
        !            92: .SH "SEE ALSO"
        !            93: date(1), adjtime(2), ctime(3), timed(8)

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