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5b2abdfb 1.\" Copyright (c) 1989, 1991, 1993
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2.\" The Regents of the University of California. All rights reserved.
3.\"
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4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
7.\"
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8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\" notice, this list of conditions and the following disclaimer in the
15.\" documentation and/or other materials provided with the distribution.
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16.\" 4. Neither the name of the University nor the names of its contributors
17.\" may be used to endorse or promote products derived from this software
18.\" without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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5b2abdfb 32.\" @(#)time.3 8.1 (Berkeley) 6/4/93
1f2f436a 33.\" $FreeBSD: src/lib/libc/gen/time.3,v 1.15 2007/01/09 00:27:55 imp Exp $
e9ce8d39 34.\"
3d9156a7 35.Dd July 18, 2003
5b2abdfb 36.Dt TIME 3
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37.Os
38.Sh NAME
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39.Nm time
40.Nd get time of day
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41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
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44.In time.h
45.Ft time_t
46.Fn time "time_t *tloc"
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47.Sh DESCRIPTION
48The
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49.Fn time
50function
51returns the value of time in seconds since 0 hours, 0 minutes,
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520 seconds, January 1, 1970, Coordinated Universal Time,
53without including leap seconds.
3d9156a7 54If an error occurs,
5b2abdfb 55.Fn time
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56returns the value
57.Po Vt time_t Pc Ns \-1 .
58.Pp
59The return value is also stored in
60.No \&* Ns Va tloc ,
61provided that
62.Va tloc
63is non-null.
e9ce8d39 64.Sh ERRORS
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65The
66.Fn time
67function may fail for any of the reasons described in
68.Xr gettimeofday 2 .
e9ce8d39 69.Sh SEE ALSO
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70.Xr gettimeofday 2 ,
71.Xr ctime 3
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72.Sh STANDARDS
73The
74.Nm
75function conforms to
76.St -p1003.1-2001 .
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77.Sh HISTORY
78A
79.Fn time
80function appeared in
81.At v6 .
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82.Sh BUGS
83Neither
84.St -isoC-99
85nor
86.St -p1003.1-2001
87requires
88.Fn time
89to set
90.Va errno
91on failure; thus, it is impossible for an application to distinguish
92the valid time value \-1 (representing the last UTC second of 1969)
93from the error return value.
94.Pp
95Systems conforming to earlier versions of the C and
96.Tn POSIX
97standards (including older versions of
98.Fx )
99did not set
100.No \&* Ns Va tloc
101in the error case.