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

1.1     ! root        1: .\" Copyright (c) 1980 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: .\"    @(#)adjtime.2   1.6 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH ADJTIME 2 "June 23, 1990"
        !            21: .UC 6
        !            22: .SH NAME
        !            23: adjtime \- correct the time to allow synchronization of the system clock
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .ft B
        !            27: #include <sys/time.h>
        !            28: .PP
        !            29: .ft B
        !            30: adjtime(delta, olddelta)
        !            31: struct timeval *delta; 
        !            32: struct timeval *olddelta;
        !            33: .fi
        !            34: .SH DESCRIPTION
        !            35: .I Adjtime
        !            36: makes small adjustments to the system time, as returned by
        !            37: .IR gettimeofday (2),
        !            38: advancing or retarding it
        !            39: by the time specified by the timeval
        !            40: \fIdelta\fP.
        !            41: If \fIdelta\fP is negative, the clock is
        !            42: slowed down by incrementing it more slowly than normal until
        !            43: the correction is complete.
        !            44: If \fIdelta\fP is positive, a larger increment than normal
        !            45: is used.
        !            46: The skew used to perform the correction is generally a fraction of one percent.
        !            47: Thus, the time is always
        !            48: a monotonically increasing function.
        !            49: A time correction from an earlier call to \fIadjtime\fP
        !            50: may not be finished when \fIadjtime\fP is called again.
        !            51: If \fIolddelta\fP is non-zero,
        !            52: then the structure pointed to will contain, upon return, the
        !            53: number of microseconds still to be corrected
        !            54: from the earlier call.
        !            55: .PP
        !            56: This call may be used by time servers that synchronize the clocks
        !            57: of computers in a local area network.
        !            58: Such time servers would slow down the clocks of some machines
        !            59: and speed up the clocks of others to bring them to the average network time.
        !            60: .PP
        !            61: The call 
        !            62: .IR adjtime (2)
        !            63: is restricted to the super-user.
        !            64: .SH "RETURN VALUE
        !            65: A return value of 0 indicates that the call succeeded.
        !            66: A return value of \-1 indicates that an error occurred, and in this
        !            67: case an error code is stored in the global variable \fIerrno\fP.
        !            68: .SH "ERRORS
        !            69: The following error codes may be set in \fIerrno\fP:
        !            70: .TP 15
        !            71: [EFAULT]
        !            72: An argument points outside the process's allocated address space.
        !            73: .TP 15
        !            74: [EPERM]
        !            75: The process's effective user ID is not that of the super-user.
        !            76: .SH "SEE ALSO"
        !            77: date(1), gettimeofday(2), timed(8), timedc(8),
        !            78: .br
        !            79: \fITSP: The Time Synchronization Protocol for UNIX 4.3BSD\fP, 
        !            80: R. Gusella and S. Zatti

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