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|File: [cvs.NetBSD.org] / src / lib / libc / gen / time.3 (download)
Revision 1.16, Sat Nov 5 18:17:29 2011 UTC (4 years, 5 months ago) by christos
there no errors defined for time.
.\" $NetBSD: time.3,v 1.16 2011/11/05 18:17:29 christos Exp $ .\" .\" Copyright (c) 1989, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" the American National Standards Committee X3, on Information .\" Processing Systems. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)time.3 8.1 (Berkeley) 6/4/93 .\" .Dd November 5, 2011 .Dt TIME 3 .Os .Sh NAME .Nm time .Nd get time of day .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In time.h .Ft time_t .Fn time "time_t *tloc" .Sh DESCRIPTION The .Fn time function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time. .Pp A copy of the time value may be saved to the area indicated by the pointer .Fa tloc . If .Fa tloc is a .Dv NULL pointer, no value is stored. .Pp Upon successful completion, .Fn time returns the value of time. Otherwise a value of .Po .Po Fa time_t Pc \-1 .Pc is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS No errors are defined. .Sh SEE ALSO .Xr gettimeofday 2 , .Xr ctime 3 .Sh STANDARDS The .Fn time function conforms to .St -p1003.1-90 . .Sh HISTORY A .Fn time function appeared in .At v2 . It returned a 32-bit value measuring sixtieths of a second, leading to rollover every 2.26 years. In .At v6 , the precision of .Fn time was changed to seconds, allowing 135.6 years between rollovers. .Pp In .Nx 6.0 the .Vt time_t type was changed to be 64 bits wide, including on 32-bit machines, making rollover a concern for the far distant future only. Note however that any code making the incorrect assumption that .Vt time_t is the same as .Vt long will fail on 32-bit machines in 2038.