1 .\" Copyright (c) 2007 by Michael Kerrisk <mtk.manpages@gmail.com>
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23 .\" 2007-07-31, mtk, Created
25 .\" Japanese Version Copyright (c) 2007 Akihiro MOTOKI
26 .\" all rights reserved.
27 .\" Translated 2007-10-16, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.66
28 .\" Updated 2009-04-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.20
30 .TH TIMERADD 3 2010-02-25 "Linux" "Linux Programmer's Manual"
33 .\"O timeradd, timersub, timercmp, timerclear, timerisset \- timeval operations
34 timeradd, timersub, timercmp, timerclear, timerisset \- timeval の操作
38 .B #include <sys/time.h>
40 .BI "void timeradd(struct timeval *" a ", struct timeval *" b ,
41 .BI " struct timeval *" res );
43 .BI "void timersub(struct timeval *" a ", struct timeval *" b ,
44 .BI " struct timeval *" res );
46 .BI "void timerclear(struct timeval *" tvp );
48 .BI "int timerisset(struct timeval *" tvp );
50 .BI "int timercmp(struct timeval *" a ", struct timeval *" b ", " CMP );
54 .\"O Feature Test Macro Requirements for glibc (see
55 .\"O .BR feature_test_macros (7)):
57 .RB ( feature_test_macros (7)
61 .\"O All functions shown above:
66 .\"O The macros are provided to operate on
68 .\"O structures, defined in
72 構造体を操作するためのマクロが提供されている。
81 .\"O time_t tv_sec; /* seconds */
82 .\"O suseconds_t tv_usec; /* microseconds */
83 time_t tv_sec; /* 秒 */
84 suseconds_t tv_usec; /* マイクロ秒 */
90 .\"O adds the time values in
94 .\"O and places the sum in the
98 .\"O The result is normalized such that
100 .\"O has a value in the range 0 to 999,999.
112 の値が 0 から 999,999 の範囲に入るように正規化される。
115 .\"O subtracts the time value in
117 .\"O from the time value in
119 .\"O and places the result in the
123 .\"O The result is normalized such that
124 .\"O .I res\->tv_usec
125 .\"O has a value in the range 0 to 999,999.
137 の値が 0 から 999,999 の範囲に入るように正規化される。
139 .\"O .BR timerclear ()
142 .\"O structure pointed to by
144 .\"O so that it represents the Epoch: 1970-01-01 00:00:00 +0000 (UTC).
153 構造体は、時刻紀元 (Epoch; 1970-01-01 00:00:00 +0000 (UTC)) を表す。
155 .\"O .BR timerisset ()
156 .\"O returns true (nonzero) if either field of the
158 .\"O structure pointed to by
160 .\"O contains a nonzero value.
166 構造体のいずれか一方のフィールドに 0 以外の値が入っていれば、
170 .\"O compares the timer values in
174 .\"O using the comparison operator
176 .\"O and returns true (nonzero) or false (0) depending on
177 .\"O the result of the comparison.
185 を使って比較し、比較結果に基づき、真 (0 以外) か偽 (0) を返す。
186 .\"O Some systems (but not Linux/glibc),
190 .\"O .\" HP-UX, Tru64, Irix have a definition like:
191 .\"O .\"#define timercmp(tvp, uvp, cmp) \
192 .\"O .\" ((tvp)->tv_sec cmp (uvp)->tv_sec || \
193 .\"O .\" (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
202 (Linux/glibc はそうではないが)
206 .\" HP-UX, Tru64, Irix では以下のように定義されている。
207 .\"#define timercmp(tvp, uvp, cmp) \
208 .\" ((tvp)->tv_sec cmp (uvp)->tv_sec || \
209 .\" (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
216 .\"O portable applications can instead use
223 .\"O .SH RETURN VALUE
225 .\"O .BR timerisset ()
228 .\"O return true (nonzero) or false (0).
232 は、真 (0 以外) か偽 (0) を返す。
236 .\"O No errors are defined.
238 .\"O .SH CONFORMING TO
240 .\"O Not in POSIX.1-2001.
241 .\"O Present on most BSD derivatives.
243 ほとんどの BSD 由来のシステムには存在する。
246 .BR gettimeofday (2),