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.\" Copyright 7/93 by Darren Senn <sinster@scintilla.santa-clara.ca.us>
.\" Based on a similar page Copyright 1992 by Rick Faith
.\" May be freely distributed
.\" Modified Tue Oct 22 00:22:35 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" 2005-04-06 mtk, Matthias Lang <matthias@corelatus.se>
.\" Noted MAX_SEC_IN_JIFFIES ceiling
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\" all rights reserved.
.\" Translated 1997-02-22, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2005-04-23, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-09-11, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2006-07-23, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2007-10-14, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.\" WORD: timer ޡ
.\" WORD: jiffies jiffy
.\"
.TH GETITIMER 2 2006-04-27 "Linux" "Linux Programmer's Manual"
.SH ̾
getitimer, setitimer \- Х롦ޡͤޤꤹ
.SH
.nf
.B #include <sys/time.h>
.sp
.BI "int getitimer(int " which ", struct itimerval *" value );
.br
.BI "int setitimer(int " which ", const struct itimerval *" value ,
.BI " struct itimerval *" ovalue );
.fi
.SH
ƥ 1 ĤΥץˤĤ 3 ĤΥХ롦ޡ롣
줾Υޡ̡λΰǸ롣
ɤΥޡλȥץ˥ʥ뤬졢
ޡ (ˤäƤ) ƤӳϤ롣
.TP 1.5i
.B ITIMER_REAL
» (real time) Ǹλ
.B SIGALRM
롣
.TP
.B ITIMER_VIRTUAL
ץ¹ԤƤ֤Τ߸λ
.B SIGVTALRM
롣
.TP
.B ITIMER_PROF
ץ¹ԤƤơ
ĥƥबΥץΤ˽ԤʤäƤ֤˸롣
¿ξ硢Υޡ
.B ITIMER_VIRTUAL
Ȥ߹蘆ơץꥱ֤ͥȥ桼֤
ɤλ֤ᤴץե뤹Τ˻Ѥ롣
λ
.B SIGPROF
롣
.LP
ޡͤϰʲι¤Τˤä:
.PD 0
.in +4n
.nf
struct itimerval {
struct timeval it_interval; /* next value */
struct timeval it_value; /* current value */
};
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* microseconds */
};
.fi
.in
.PD
.LP
.BR getitimer ()
ؿϡ
.I which
ǻꤵ줿ޡ
.RB ( ITIMER_REAL ,
.BR ITIMER_VIRTUAL ,
.B ITIMER_PROF
Τɤ줫) θߤ
.I value
ǻꤵ줿¤Τ˳Ǽ롣
.I it_value
ǤˤϥޡλĤ֤ꤵ롣ޡդξ
ꤵ롣Ʊͤ
.I it_interval
ˤϽͤꤵ롣
.BR setitimer ()
ؿϻꤵ줿ޡ
.I value
ͤꤹ롣
.I ovalue
ʳξ硢ޡθŤͤ
.I ovalue
˳Ǽ롣
.LP
ޡ
.I it_value
饼ظƸäƤʥ
.I it_interval
˽롣
ޡꤵ줿
.RI ( it_value
ޡλ
.I it_interval
ξ) ߤ롣
.LP
ޡδ֤
.I tv_sec
.I tv_usec
ξˤꤵ롣
.LP
ᤷ֤˥ޡλ뤳ȤϤʤ
դˤ (û) ֤λ٤뤳ȤϤ롣
ɤ٤뤫ϥƥλʬǽȥƥ٤˰¸
(âХι⻲ȤΤ)
ޡλȥʥ뤬졢ޡϽ롣
ץƥ֤ʻ
.RB ( ITIMER_VIRTUAL
ξˤϾˤǤ) ˥ޡλ硢줿ʥ
롣ʳξϡƥ٤ˤ꾯λ֤
٤롣
.SH ֤
ϥ֤롣顼ξ \-1 ֤ꡢ
.I errno
Ŭڤꤵ롣
.SH 顼
.TP
.B EFAULT
.I value
ޤ
.I ovalue
ͭʥݥǤʤ
.TP
.B EINVAL
.I which
.BR ITIMER_REAL ,
.BR ITIMER_VIRTUAL ,
.B ITIMER_PROF
ΤɤǤʤ
ޤ (ͥ 2.6.22 ʹߤ)
.I tv_usec
եɤΰĤ 0 ʾ 999999 ʲϰϤʤͤǤ롣
.SH
POSIX.1-2001, SVr4, 4.4BSD (Υ 4.2BSD ǻϤƸ줿).
.SH
.BR fork (2)
Ǻ줿ҥץϡ
ƥץΥХ롦ޡѾʤ
.BR execve (2)
ǤϥХ롦ޡ¸롣
.SH Х
ʥ̸ĤΤΤǤꡢ
ҤΥʥΤ줾ˤĤưĤץΤ
Ե롣
˽Ť٤βǤϡ
.B ITIMER_REAL
ޡǤϡڤˤ줿Υʥ뤬ˡ
λڤ줬礬롣
Τ褦ʾ硢 2 ĤΥ٥ȤФ륷ʥϼƤޤ
Linux Ǥϡޡͤ jiffy ɽ롣
jiffy ɽ
.RI ( include/linux/jiffies.h
Ƥ)
.B MAX_SEC_IN_JIFFIES
ۤͤޡꤷ褦ȤΤξ硢
ޡϰۤˤξͤڤͤ롣
Linux/i386 ξ (ͥ 2.6.13 ʹߤǤ jiffy 0.004 ) ξ硢
ϥޡξͤ褽 99.42 ˤʤ뤳Ȥ̣롣
(i386 ޤ) ĤΥƥǤϡ
С 2.6.12 Linux ͥ
ξǤ 1 jiffy ޡλƤޤȤХä
ΥХϥͥ 2.6.12 ǽ줿
.\" 4 Jul 2005: It looks like this bug may remain in 2.4.x.
.\" http://lkml.org/lkml/2005/7/1/165
POSIX.1-2001 Ǥ
.BR setitimer ()
.I tv_usec
ͤ 0 999999 ϰϳǤˤϼԤ٤ȤƤ롣
2.6.21 Υͥ Linux Ǥϥ顼ˤʤ餺
бÿʬΥޡäͤۤĴ롣
ͥ 2.6.22 ʹߤǤϡɸưϽ졢
.I tv_usec
ͤŬڤʾˤ
.B EINVAL
顼Ȥʤ롣
.\" Bugzilla report 25 Apr 2006:
.\" http://bugzilla.kernel.org/show_bug.cgi?id=6443
.\" "setitimer() should reject non-canonical arguments"
.SH Ϣ
.BR gettimeofday (2),
.BR sigaction (2),
.BR signal (2),
.BR timerfd_create (2),
.BR time (7)
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