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1 | .\" Copyright (c) 1993 Michael Haardt |
2 | .\" (michael@moria.de) | |
3 | .\" Fri Apr 2 11:32:09 MET DST 1993 | |
4 | .\" | |
1dd72f9c | 5 | .\" %%%LICENSE_START(GPLv2+_DOC_FULL) |
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6 | .\" This is free documentation; you can redistribute it and/or |
7 | .\" modify it under the terms of the GNU General Public License as | |
8 | .\" published by the Free Software Foundation; either version 2 of | |
9 | .\" the License, or (at your option) any later version. | |
10 | .\" | |
11 | .\" The GNU General Public License's references to "object code" | |
12 | .\" and "executables" are to be interpreted as the output of any | |
13 | .\" document formatting or typesetting system, including | |
14 | .\" intermediate and printed output. | |
15 | .\" | |
16 | .\" This manual is distributed in the hope that it will be useful, | |
17 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | .\" GNU General Public License for more details. | |
20 | .\" | |
21 | .\" You should have received a copy of the GNU General Public | |
c715f741 MK |
22 | .\" License along with this manual; if not, see |
23 | .\" <http://www.gnu.org/licenses/>. | |
6a8d8745 | 24 | .\" %%%LICENSE_END |
fea681da MK |
25 | .\" |
26 | .\" Modified Sat Jul 24 14:23:14 1993 by Rik Faith (faith@cs.unc.edu) | |
27 | .\" Modified Sun Oct 18 17:31:43 1998 by Andries Brouwer (aeb@cwi.nl) | |
cb772f76 | 28 | .\" 2008-06-23, mtk, minor rewrites, added some details |
fea681da | 29 | .\" |
4b8c67d9 | 30 | .TH FTIME 3 2017-09-15 "GNU" "Linux Programmer's Manual" |
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31 | .SH NAME |
32 | ftime \- return date and time | |
33 | .SH SYNOPSIS | |
34 | .B "#include <sys/timeb.h>" | |
68e4db0a | 35 | .PP |
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36 | .BI "int ftime(struct timeb *" tp ); |
37 | .SH DESCRIPTION | |
f49c451a MW |
38 | This function returns the current time as seconds and milliseconds |
39 | since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). | |
cb772f76 | 40 | The time is returned in |
fea681da MK |
41 | .IR tp , |
42 | which is declared as follows: | |
51f5698d | 43 | .PP |
a08ea57c | 44 | .in +4n |
b8302363 | 45 | .EX |
fea681da | 46 | struct timeb { |
cab87712 | 47 | time_t time; |
7295b7ed | 48 | unsigned short millitm; |
cab87712 MK |
49 | short timezone; |
50 | short dstflag; | |
fea681da | 51 | }; |
b8302363 | 52 | .EE |
a08ea57c | 53 | .in |
dd3568a1 | 54 | .PP |
be9634cf | 55 | Here \fItime\fP is the number of seconds since the Epoch, |
cb772f76 MK |
56 | and \fImillitm\fP is the number of milliseconds since \fItime\fP |
57 | seconds since the Epoch. | |
5b0dc1ba | 58 | The \fItimezone\fP field is the local timezone measured in minutes |
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59 | of time west of Greenwich (with a negative value indicating minutes |
60 | east of Greenwich). | |
61 | The \fIdstflag\fP field | |
c7094399 | 62 | is a flag that, if nonzero, indicates that Daylight Saving time |
fea681da | 63 | applies locally during the appropriate part of the year. |
dd3568a1 | 64 | .PP |
cb772f76 MK |
65 | POSIX.1-2001 says that the contents of the \fItimezone\fP and \fIdstflag\fP |
66 | fields are unspecified; avoid relying on them. | |
47297adb | 67 | .SH RETURN VALUE |
fea681da | 68 | This function always returns 0. |
cb772f76 | 69 | (POSIX.1-2001 specifies, and some systems document, a \-1 error return.) |
53d029b3 | 70 | .SH ATTRIBUTES |
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71 | For an explanation of the terms used in this section, see |
72 | .BR attributes (7). | |
73 | .TS | |
74 | allbox; | |
75 | lb lb lb | |
76 | l l l. | |
77 | Interface Attribute Value | |
78 | T{ | |
53d029b3 | 79 | .BR ftime () |
21576164 MK |
80 | T} Thread safety MT-Safe |
81 | .TE | |
47297adb | 82 | .SH CONFORMING TO |
2b2581ee | 83 | 4.2BSD, POSIX.1-2001. |
2f0526ae MK |
84 | POSIX.1-2008 removes the specification of |
85 | .BR ftime (). | |
847e0d88 | 86 | .PP |
c13182ef MK |
87 | This function is obsolete. |
88 | Don't use it. | |
89 | If the time in seconds | |
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90 | suffices, |
91 | .BR time (2) | |
92 | can be used; | |
93 | .BR gettimeofday (2) | |
94 | gives microseconds; | |
0eb44391 | 95 | .BR clock_gettime (2) |
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96 | gives nanoseconds but is not as widely available. |
97 | .SH BUGS | |
dd3568a1 | 98 | .PP |
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99 | Early glibc2 is buggy and returns 0 in the |
100 | .I millitm | |
101 | field; | |
fea681da | 102 | glibc 2.1.1 is correct again. |
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103 | .\" .SH HISTORY |
104 | .\" The | |
105 | .\" .BR ftime () | |
106 | .\" function appeared in 4.2BSD. | |
47297adb | 107 | .SH SEE ALSO |
fea681da MK |
108 | .BR gettimeofday (2), |
109 | .BR time (2) |