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Annotation of 43BSDTahoe/man/man2/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
        !             5: .\" provided that the above copyright notice and this paragraph are
        !             6: .\" duplicated in all such forms and that any documentation,
        !             7: .\" advertising materials, and other materials related to such
        !             8: .\" distribution and use acknowledge that the software was developed
        !             9: .\" by the University of California, Berkeley.  The name of the
        !            10: .\" University may not be used to endorse or promote products derived
        !            11: .\" from this software without specific prior written permission.
        !            12: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            13: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            14: .\" WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            15: .\"
        !            16: .\"    @(#)adjtime.2   1.5 (Berkeley) 7/9/88
        !            17: .\"
        !            18: .TH ADJTIME 2 "July 9, 1988"
        !            19: .UC 6
        !            20: .SH NAME
        !            21: adjtime \- correct the time to allow synchronization of the system clock
        !            22: .SH SYNOPSIS
        !            23: .nf
        !            24: .ft B
        !            25: #include <sys/time.h>
        !            26: .PP
        !            27: .ft B
        !            28: adjtime(delta, olddelta)
        !            29: struct timeval *delta; 
        !            30: struct timeval *olddelta;
        !            31: .fi
        !            32: .SH DESCRIPTION
        !            33: .I Adjtime
        !            34: makes small adjustments to the system time, as returned by
        !            35: .IR gettimeofday (2),
        !            36: advancing or retarding it
        !            37: by the time specified by the timeval
        !            38: \fIdelta\fP.
        !            39: If \fIdelta\fP is negative, the clock is
        !            40: slowed down by incrementing it more slowly than normal until
        !            41: the correction is complete.
        !            42: If \fIdelta\fP is positive, a larger increment than normal
        !            43: is used.
        !            44: The skew used to perform the correction is generally a fraction of one percent.
        !            45: Thus, the time is always
        !            46: a monotonically increasing function.
        !            47: A time correction from an earlier call to \fIadjtime\fP
        !            48: may not be finished when \fIadjtime\fP is called again.
        !            49: If \fIolddelta\fP is non-zero,
        !            50: then the structure pointed to will contain, upon return, the
        !            51: number of microseconds still to be corrected
        !            52: from the earlier call.
        !            53: .PP
        !            54: This call may be used by time servers that synchronize the clocks
        !            55: of computers in a local area network.
        !            56: Such time servers would slow down the clocks of some machines
        !            57: and speed up the clocks of others to bring them to the average network time.
        !            58: .PP
        !            59: The call 
        !            60: .IR adjtime (2)
        !            61: is restricted to the super-user.
        !            62: .SH "RETURN VALUE
        !            63: A return value of 0 indicates that the call succeeded.
        !            64: A return value of \-1 indicates that an error occurred, and in this
        !            65: case an error code is stored in the global variable \fIerrno\fP.
        !            66: .SH "ERRORS
        !            67: The following error codes may be set in \fIerrno\fP:
        !            68: .TP 15
        !            69: [EFAULT]
        !            70: An argument points outside the process's allocated address space.
        !            71: .TP 15
        !            72: [EPERM]
        !            73: The process's effective user ID is not that of the super-user.
        !            74: .SH "SEE ALSO"
        !            75: date(1), gettimeofday(2), timed(8), timedc(8),
        !            76: .br
        !            77: \fITSP: The Time Synchronization Protocol for UNIX 4.3BSD\fP, 
        !            78: R. Gusella and S. Zatti

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