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Annotation of 43BSDReno/lib/libc/sys/gettimeofday.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 The Regents of the University of California.
                      2: .\" All rights reserved.
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                     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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