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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / poll.2

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
.\" and Copyright (C) 2006, Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Additions from Richard Gooch <rgooch@atnf.CSIRO.AU> and aeb, 971207
.\" 2006-03-13, mtk, Added ppoll() + various other rewordings
.\" 2006-07-01, mtk, Added POLLRDHUP + various other wording and
.\"     formatting changes.
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated 1997-12-11, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified 2004-05-22, Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified 2005-01-03, Yuichi SATO
.\" Updated & Modified 2005-10-10, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2005-12-05, Akihiro MOTOKI, Catch up to LDP man-pages 2.16
.\" Updated 2006-04-16, Akihiro MOTOKI, Catch up to LDP man-pages 2.28
.\" Updated 2006-07-23, Akihiro MOTOKI, Catch up to LDP man-pages 2.36
.\"
.\"WORD:        descriptor              ¥Ç¥£¥¹¥¯¥ê¥×¥¿
.\"
.TH POLL 2 2009-09-15 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O poll, ppoll \- wait for some event on a file descriptor
poll, ppoll \- ¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ë¤ª¤±¤ë¥¤¥Ù¥ó¥È¤òÂÔ¤Ä
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <poll.h>
.sp
.BI "int poll(struct pollfd *" fds ", nfds_t " nfds ", int " timeout );
.sp
.B #define _GNU_SOURCE
.B #include <poll.h>
.sp
.BI "int ppoll(struct pollfd *" fds ", nfds_t " nfds ", "
.BI "        const struct timespec *" timeout ", const sigset_t *" sigmask );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR poll ()
.\"O performs a similar task to
.\"O .BR select (2):
.\"O it waits for one of a set of file descriptors to become ready
.\"O to perform I/O.
.BR poll ()
¤Ï
.BR select (2)
¤ÈƱÍͤλŻö¤ò¹Ô¤¦¡¢¤Ä¤Þ¤ê¡¢¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿½¸¹ç¤Î¤¤¤º¤ì¤«°ì¤Ä¤¬
I/O ¤ò¼Â¹Ô²Äǽ¤Ê¾õÂ֤ˤʤë¤Î¤òÂԤġ£

.\"O The set of file descriptors to be monitored is specified in the
.\"O .I fds
.\"O argument, which is an array of structures of the following form:
´Æ»ë¤¹¤ë¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿½¸¹ç¤Ï¡¢
.I fds
°ú¤­¿ô¤Ç»ØÄꤹ¤ë¡£
.I fds
¤Ï¡¢°Ê²¼¤Î·¿¤Î¹½Â¤ÂΤÎÇÛÎó¤Ç¤¢¤ë¡£
.in +4n
.nf

struct pollfd {
    int   fd;         /* file descriptor */
    short events;     /* requested events */
    short revents;    /* returned events */
};
.in
.fi
.PP
.\"O The caller should specify the number of items in the
.\"O .I fds
.\"O array in
.\"O .IR nfds .
.I nfds
¤Ë¤Ï¡¢
.I fds
ÇÛÎó¤ÎÍ×ÁÇ¿ô¤ò»ØÄꤹ¤ë¡£

.\"O The field
.\"O .I fd
.\"O contains a file descriptor for an open file.
¹½Â¤ÂΤÎ
.I fd
¤Ë¤Ï¥ª¡¼¥×¥ó¤·¤¿¥Õ¥¡¥¤¥ë¤Î¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤òÆþ¤ì¤ë¡£

.\"O The field
.\"O .I events
.\"O is an input parameter, a bit mask specifying the events the application
.\"O is interested in.
¹½Â¤ÂΤÎ
.I events
Í×ÁǤÏÆþÎϥѥé¥á¡¼¥¿¤Ç¡¢¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤¬¶½Ì£¤ò»ý¤Ã¤Æ¤¤¤ë¥¤¥Ù¥ó¥È¤Î
¥Ó¥Ã¥È¥Þ¥¹¥¯¤ò»ØÄꤹ¤ë¡£

.\"O The field
.\"O .I revents
.\"O is an output parameter, filled by the kernel with the events that
.\"O actually occurred.
.\"O The bits returned in
.\"O .I revents
.\"O can include any of those specified in
.\"O .IR events ,
.\"O or one of the values
.\"O .BR POLLERR ,
.\"O .BR POLLHUP ,
.\"O or
.\"O .BR POLLNVAL .
.\"O (These three bits are meaningless in the
.\"O .I events
.\"O field, and will be set in the
.\"O .I revents
.\"O field whenever the corresponding condition is true.)
.I revents
Í×ÁǤϽÐÎϥѥé¥á¡¼¥¿¤Ç¡¢¼ÂºÝ¤Ëµ¯¤³¤Ã¤¿¥¤¥Ù¥ó¥È¤¬¥«¡¼¥Í¥ë¤Ë¤è¤êÀßÄꤵ¤ì¤ë¡£
.I revents
¤ÇÊÖ¤µ¤ì¤ë¥Ó¥Ã¥ÈÎó¤Ë¤Ï¡¢
.I events
¤Ç»ØÄꤷ¤¿¤â¤Î¤Î¤É¤ì¤«¡¢¤â¤·¤¯¤Ï
.BR POLLERR ,
.BR POLLHUP ,
.B POLLNVAL
¤Î¤¦¤Á¤Î°ì¤Ä¤¬´Þ¤Þ¤ì¤ë
.RB ( POLLERR ,
.BR POLLHUP ,
.B POLLNVAL
¤Î 3¤Ä¤Î¥Ó¥Ã¥È¤Ï
.I events
¤Ë»ØÄꤷ¤Æ¤â°ÕÌ£¤¬¤Ê¤¯¡¢Âбþ¤·¤¿¾õÂÖ¤¬¿¿¤Î¾ì¹ç¤Ë
.I revents
¤ËÀßÄꤵ¤ì¤ë)¡£

.\"O If none of the events requested (and no error) has occurred for any
.\"O of the file descriptors, then
.\"O .BR poll ()
.\"O blocks until one of the events occurs.
¤É¤Î¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ë¤âÍ׵ᤷ¤¿¥¤¥Ù¥ó¥È¤¬È¯À¸¤·¤Æ¤ª¤é¤º¡¢
¥¨¥é¡¼¤âµ¯¤³¤é¤Ê¤¤¾ì¹ç¡¢
.BR poll ()
¤Ï¥¤¥Ù¥ó¥È¤Î¤¦¤Á¤¤¤º¤ì¤«°ì¤Ä¤¬È¯À¸¤¹¤ë¤Þ¤ÇÄä»ß (block) ¤¹¤ë¡£

.\"O The
.\"O .I timeout
.\"O argument specifies an upper limit on the time for which
.\"O .BR poll ()
.\"O will block, in milliseconds.
.\"O Specifying a negative value in
.\"O .I timeout
.\"O means an infinite timeout.
.I timeout
°ú¤­¿ô¤Ï
.BR poll ()
¤¬Ää»ß¤¹¤ë»þ´Ö¤Î¾å¸Â¤òÀßÄꤹ¤ë¤â¤Î¤Ç¡¢¥ß¥êÉÃñ°Ì¤Ç»ØÄꤹ¤ë¡£
.I timeout
¤ËÉé¤ÎÃͤò»ØÄꤹ¤ë¤È¡¢¥¿¥¤¥à¥¢¥¦¥È»þ´Ö¤¬Ìµ¸Â¤È¤Ê¤ë¡£

.\"O The bits that may be set/returned in
.\"O .I events
.\"O and
.\"O .I revents
.\"O are defined in \fI<poll.h>\fP:
.I events
¤Ë»ØÄꤷ¤¿¤ê¡¢
.I revents
¤ÇÊÖ¤µ¤ì¤ë¥Ó¥Ã¥È¤Ï \fI<poll.h>\fP ¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë:
.RS
.TP
.B POLLIN
.\"O There is data to read.
Æɤ߽Ф·²Äǽ¤Ê¥Ç¡¼¥¿¤¬¤¢¤ë¡£
.TP
.B POLLPRI
.\"O There is urgent data to read (e.g., out-of-band data on TCP socket;
.\"O pseudo-terminal master in packet mode has seen state change in slave).
Æɤ߽Ф·²Äǽ¤Ê¶ÛµÞ¥Ç¡¼¥¿ (urgent data) ¤¬¤¢¤ë
(Î㤨¤Ð¡¢TCP ¥½¥±¥Ã¥È¤ÎÂÓ°è³° (out-of-band data) ¥Ç¡¼¥¿¤ò¼õ¿®¤·¤¿¾ì¹ç¤ä¡¢
¥Ñ¥±¥Ã¥È¥â¡¼¥É¤Îµ¼»÷üËö¤Î¥Þ¥¹¥¿¤¬¥¹¥ì¡¼¥Ö¦¤ÎÊѲ½¤ò¸«¤Ä¤±¤¿¤È¤­)¡£
.TP
.B POLLOUT
.\"O Writing now will not block.
½ñ¤­¹þ¤ß¤¬Ää»ß (block) ¤·¤Ê¤¤¾õÂ֤Ǥ¢¤ë¡£
.TP
.\"O .BR POLLRDHUP " (since Linux 2.6.17)"
.BR POLLRDHUP " (Linux 2.6.17 °Ê¹ß)"
.\"O Stream socket peer closed connection,
.\"O or shut down writing half of connection.
.\"O The
.\"O .B _GNU_SOURCE
.\"O feature test macro must be defined in order to obtain this definition.
¥¹¥È¥ê¡¼¥à¥½¥±¥Ã¥È¤Î¾ü¤¬¡¢¥³¥Í¥¯¥·¥ç¥ó¤ò close ¤·¤¿¤«¡¢
¥³¥Í¥¯¥·¥ç¥ó¤Î½ñ¤­¹þ¤ß¦¤ò shutdown ¤·¤¿¡£
¤³¤ÎÄêµÁ¤òÍ­¸ú¤Ë¤¹¤ë¤Ë¤Ï¡¢
.B _GNU_SOURCE
µ¡Ç½¸¡ºº¥Þ¥¯¥í¤òÄêµÁ¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.TP
.B POLLERR
.\"O Error condition (output only).
¥¨¥é¡¼¾õÂÖ (½ÐÎϤξì¹ç¤Î¤ß)¡£
.TP
.B POLLHUP
.\"O Hang up (output only).
¥Ï¥ó¥°¥¢¥Ã¥×¤·¤¿ (½ÐÎϤξì¹ç¤Î¤ß)¡£
.TP
.B POLLNVAL
.\"O Invalid request:
.\"O .I fd
.\"O not open (output only).
ÉÔÀµ¤ÊÍ×µá:
.I fd
¤¬¥ª¡¼¥×¥ó¤µ¤ì¤Æ¤¤¤Ê¤¤ (½ÐÎϤξì¹ç¤Î¤ß)¡£
.RE
.PP
.\"O When compiling with
.\"O .B _XOPEN_SOURCE
.\"O defined, one also has the following,
.\"O which convey no further information beyond the bits listed above:
.B _XOPEN_SOURCE
¤òÄêµÁ¤·¤Æ¥³¥ó¥Ñ¥¤¥ë¤·¤¿¾ì¹ç¤Ë¤Ï¡¢°Ê²¼¤ÎÄêµÁ¤â¹Ô¤ï¤ì¤ë¡£
¤¿¤À¤·¡¢¾åµ­¤Î¥ê¥¹¥È¤Ë¤¢¤ë¥Ó¥Ã¥È°Ê¾å¤Î¾ðÊó¤¬ÆÀ¤é¤ì¤ëÌõ¤Ç¤Ï¤Ê¤¤¡£
.RS
.TP
.B POLLRDNORM
.\"O Equivalent to
.\"O .BR POLLIN .
.B POLLIN
¤ÈƱ¤¸¡£
.TP
.B POLLRDBAND
.\"O Priority band data can be read (generally unused on Linux).
Í¥ÀèÂÓ°è¥Ç¡¼¥¿ (priority band data) ¤¬Æɤ߽Ф·²Äǽ¤Ç¤¢¤ë
(ÉáÄÌ¤Ï Linux ¤Ç¤Ï»ÈÍѤµ¤ì¤Ê¤¤)¡£
.\" POLLRDBAND is used in the DECnet protocol.
.TP
.B POLLWRNORM
.\"O Equivalent to
.\"O .BR POLLOUT .
.B POLLOUT
¤ÈƱ¤¸¡£
.TP
.B POLLWRBAND
.\"O Priority data may be written.
Í¥ÀèÂÓ°è¥Ç¡¼¥¿ (priority data) ¤¬½ñ¤­¹þ¤ß²Äǽ¤Ç¤¢¤ë¡£
.RE
.PP
.\"O Linux also knows about, but does not use
.\"O .BR POLLMSG .
Linux ¤Ç¤Ï
.B POLLMSG
¤âÄêµÁ¤µ¤ì¤Æ¤¤¤ë¤¬¡¢»ÈÍѤµ¤ì¤Æ¤¤¤Ê¤¤¡£
.SS ppoll()
.\"O The relationship between
.\"O .BR poll ()
.\"O and
.\"O .BR ppoll ()
.\"O is analogous to the relationship between
.\"O .BR select (2)
.\"O and
.\"O .BR pselect (2):
.\"O like
.\"O .BR pselect (2),
.\"O .BR ppoll ()
.\"O allows an application to safely wait until either a file descriptor
.\"O becomes ready or until a signal is caught.
.BR poll ()
¤È
.BR ppoll ()
¤Î´Ø·¸¤Ï
.BR select (2)
¤È
.BR pselect (2)
¤Î´Ø·¸¤ÈƱ¤¸¤è¤¦¤Ê¤â¤Î¤Ç¤¢¤ë:
.BR pselect (2)
¤ÈƱÍͤˡ¢
.BR ppoll ()
¤ò»È¤¦¤È¡¢¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Î¾õÂÖÊѲ½
¤â¤·¤¯¤Ï¥·¥°¥Ê¥ë¤ÎÊ᪤ò°ÂÁ´¤ËÂԤĤ³¤È¤¬¤Ç¤­¤ë¡£
.PP
.\"O Other than the difference in the
.\"O .I timeout
.\"O argument, the following
.\"O .BR ppoll ()
.\"O call:
.I timeout
°ú¤­¿ô¤Î°ã¤¤¤ò½ü¤¯¤È¡¢°Ê²¼¤Î
.BR ppoll ()
¤Î¸Æ¤Ó½Ð¤·¤Ï¡¢
.nf

    ready = ppoll(&fds, nfds, timeout, &sigmask);

.fi
.\"O is equivalent to
.\"O .I atomically
.\"O executing the following calls:
¼¡¤Î¥³¡¼¥ë¤ò
.I atomic
¤Ë¼Â¹Ô¤¹¤ë¤Î¤ÈÅù²Á¤Ç¤¢¤ë¡£
.nf

    sigset_t origmask;

    sigprocmask(SIG_SETMASK, &sigmask, &origmask);
    ready = poll(&fds, nfds, timeout);
    sigprocmask(SIG_SETMASK, &origmask, NULL);
.fi
.PP
.\"O See the description of
.\"O .BR pselect (2)
.\"O for an explanation of why
.\"O .BR ppoll ()
.\"O is necessary.
¤Ê¤¼
.BR ppoll ()
¤¬É¬ÍפʤΤ«¤Ë¤Ä¤¤¤Æ¤ÎÀâÌÀ¤Ï
.BR pselect (2)
¤ÎÀâÌÀ¤ò»²¾È¤Î¤³¤È¡£

.\"O If the
.\"O .I sigmask
.\"O argument is specified as NULL, then
.\"O no signal mask manipulation is performed
.\"O (and thus
.\"O .BR ppoll ()
.\"O differs from
.\"O .BR poll ()
.\"O only in the precision of the
.\"O .I timeout
.\"O argument).
.I sigmask
°ú¤­¿ô¤Ë NULL ¤¬»ØÄꤵ¤ì¤¿¾ì¹ç¡¢¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ÎÁàºî¤Ï¹Ô¤ï¤ì¤Ê¤¤
(¤·¤¿¤¬¤Ã¤Æ¡¢
.BR ppoll ()
¤Î
.BR poll ()
¤È¤Î°ã¤¤¤Ï
.I timeout
°ú¤­¿ô¤ÎÀºÅÙ¤À¤±¤È¤Ê¤ë)¡£

.\"O The
.\"O .I timeout
.\"O argument specifies an upper limit on the amount of time that
.\"O .BR ppoll ()
.\"O will block.
.\"O This argument is a pointer to a structure of the following form:
.I timeout
°ú¤­¿ô¤Ï
.BR ppoll ()
¤¬Ää»ß¤¹¤ë»þ´Ö¤Î¾å¸Â¤ò»ØÄꤹ¤ë¤â¤Î¤Ç¤¢¤ë¡£
¤³¤Î°ú¤­¿ô¤Ë¤Ï°Ê²¼¤Î·¿¤Î¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤ò»ØÄꤹ¤ë¡£
.in +4n
.nf

struct timespec {
    long    tv_sec;         /* seconds */
    long    tv_nsec;        /* nanoseconds */
};
.fi
.in

.\"O If
.\"O .I timeout
.\"O is specified as NULL, then
.\"O .BR ppoll ()
.\"O can block indefinitely.
.I timeout
¤Ë NULL ¤¬»ØÄꤵ¤ì¤¿¾ì¹ç¡¢
.B ppoll
¤Ï̵¸Â¤ËÄä»ß¤¹¤ë¤³¤È¤¬¤¢¤êÆÀ¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success, a positive number is returned; this is
.\"O the number of structures which have nonzero
.\"O .I revents
.\"O fields (in other words, those descriptors with events or errors reported).
.\"O A value of 0 indicates that the call timed out and no file
.\"O descriptors were ready.
.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
À®¸ù¤·¤¿¾ì¹ç¤ÏÀµ¤Î¿ô¤òÊÖ¤¹¡£¤³¤Î¿ô¤Ï 0 °Ê³°¤Î
.I revents
Í×ÁǤò»ý¤Ä¹½Â¤ÂΤοô¤Ç¤¢¤ë (Ê̤θÀ¤¤Êý¤ò¤¹¤ë¤È¡¢¤³¤ì¤é¤Î¥Ç¥£¥¹¥¯¥ê¥×¥¿
¤Ë¤Ï¥¤¥Ù¥ó¥È¤«¥¨¥é¡¼Êó¹ð¤¬¤¢¤ë)¡£
ÃÍ 0 ¤Ï¡¢¥¿¥¤¥à¥¢¥¦¥È¤È¤Ê¤ê¡¢¤É¤Î¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤â¥¤¥Ù¥ó¥È¤¬
ȯÀ¸¤·¤Ê¤«¤Ã¤¿¤³¤È¤ò¼¨¤¹¡£¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤¬ÊÖ¤µ¤ì¡¢
.I errno
¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EFAULT
.\"O The array given as argument was not contained in the calling program's
.\"O address space.
°ú¤­¿ô¤È¤·¤Æ»ØÄꤷ¤¿ÇÛÎ󤬡¢¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë
´Þ¤Þ¤ì¤Æ¤¤¤Ê¤¤¡£
.TP
.B EINTR
.\"O A signal occurred before any requested event; see
.\"O .BR signal (7).
Í׵ᤵ¤ì¤¿¥¤¥Ù¥ó¥È¤Î¤É¤ì¤«¤¬µ¯¤³¤ëÁ°¤Ë¥·¥°¥Ê¥ë¤¬È¯À¸¤·¤¿¡£
.BR signal (7)
»²¾È¡£
.TP
.B EINVAL
.\"O The
.\"O .I nfds
.\"O value exceeds the
.\"O .B RLIMIT_NOFILE
.\"O value.
.I nfds
¤ÎÃͤ¬
.B RLIMIT_NOFILE
¤òĶ¤¨¤¿¡£
.TP
.B ENOMEM
.\"O There was no space to allocate file descriptor tables.
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¦¥Æ¡¼¥Ö¥ë¤ò³ÎÊݤ¹¤ë¤¿¤á¤Î¥á¥â¥ê¤¬¤Ê¤¤¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O The
.\"O .BR poll ()
.\"O system call was introduced in Linux 2.1.23.
.\"O The
.\"O .BR poll ()
.\"O library call was introduced in libc 5.4.28
.\"O (and provides emulation using select(2) if your kernel does not
.\"O have a
.\"O .BR poll ()
.\"O system call).
.BR poll ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux 2.1.23 ¤ÇƳÆþ¤µ¤ì¤¿¡£
.BR poll ()
¥é¥¤¥Ö¥é¥ê¡¦¥³¡¼¥ë¤Ï libc 5.4.28 ¤«¤éƳÆþ¤µ¤ì¤¿
(¤³¤ì¤Ï¥«¡¼¥Í¥ë¤¬
.BR poll ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤Ê¤¤¾ì¹ç¤Ë
.BR select (2)
¤ò»ÈÍѤ·¤Æ¥¨¥ß¥å¥ì¡¼¥È¤ò¹Ô¤¦)¡£

.\"O The
.\"O .BR ppoll ()
.\"O system call was added to Linux in kernel 2.6.16.
.\"O The
.\"O .BR ppoll ()
.\"O library call was added in glibc 2.4.
.BR ppoll ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï ¥«¡¼¥Í¥ë 2.6.16 ¤Ç Linux ¤ËÄɲ䵤줿¡£
.BR ppoll ()
¥é¥¤¥Ö¥é¥ê¥³¡¼¥ë¤Ï glibc 2.4 ¤ËÄɲ䵤줿¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O .BR poll ()
.\"O conforms to POSIX.1-2001.
.\"O .BR ppoll ()
.\"O is Linux-specific.
.\"O .\" NetBSD 3.0 has a pollts() which is like Linux ppoll().
.BR poll ()
¤Ï POSIX.1-2001 ¤Ë½àµò¤·¤Æ¤¤¤ë¡£
.BR ppoll ()
¤Ï Linux ¸ÇÍ­¤Ç¤¢¤ë¡£
.\" NetBSD 3.0 ¤Ë¤Ï pollts() ¤¬¤¢¤ë¡£
.\" pollts() ¤Ï Linux ppoll () ¤ÈƱ¤¸¤è¤¦¤Ê¤â¤Î¤Ç¤¢¤ë¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O Some implementations define the nonstandard constant
.\"O .B INFTIM
.\"O with the value \-1 for use as a
.\"O .IR timeout .
.\"O This constant is not provided in glibc.
¤¤¤¯¤Ä¤«¤Î¼ÂÁõ¤Ç¤Ï¡¢ÃÍ \-1 ¤ò»ý¤Ã¤¿Èóɸ½à¤ÎÄê¿ô
.B INFTIM
¤¬ÄêµÁ¤µ¤ì¤Æ¤ª¤ê¡¢
.I timeout
¤Î»ØÄê¤Ë»ÈÍѤǤ­¤ë¡£
¤³¤ÎÄê¿ô¤Ï glibc ¤Ç¤ÏÄêµÁ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£
.\"O .SS "LINUX NOTES"
.SS "Linux ¤Ç¤ÎÃí°Õ"
.\"O The Linux
.\"O .BR ppoll ()
.\"O system call modifies its
.\"O .I timeout
.\"O argument.
.\"O However, the glibc wrapper function hides this behavior
.\"O by using a local variable for the timeout argument that
.\"O is passed to the system call.
.\"O Thus, the glibc
.\"O .BR ppoll ()
.\"O function does not modify its
.\"O .I timeout
.\"O argument.
Linux ¤Î
.BR ppoll ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
.I timeout
°ú¤­¿ô¤òÊѹ¹¤¹¤ë¡£
¤·¤«¤·¡¢glibc ¤Î¥é¥Ã¥Ñ¡¼´Ø¿ô¤Ï¡¢¥·¥¹¥Æ¥à¥³¡¼¥ë¤ËÅϤ¹ timeout °ú¤­¿ô
¤È¤·¤Æ¥í¡¼¥«¥ëÊÑ¿ô¤ò»È¤¦¤³¤È¤Ç¤³¤ÎÆ°ºî¤ò±£Ê䷤Ƥ¤¤ë¡£
¤³¤Î¤¿¤á¡¢glibc ¤Î
.BR ppoll ()
´Ø¿ô¤Ï
.I timeout
°ú¤­¿ô¤òÊѹ¹¤·¤Ê¤¤¡£
.\"O .SH BUGS
.SH ¥Ð¥°
.\"O See the discussion of spurious readiness notifications under the
.\"O BUGS section of
.\"O .BR select (2).
.BR select (2)
¤Î¡Ö¥Ð¥°¡×¤ÎÀá¤Ë½ñ¤«¤ì¤Æ¤¤¤ë¡¢¸í¤Ã¤¿½àÈ÷´°Î»ÄÌÃÎ (spurious readiness
notifications) ¤Ë¤Ä¤¤¤Æ¤ÎµÄÏÀ¤ò»²¾È¤Î¤³¤È¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR select (2),
.BR select_tut (2),
.BR feature_test_macros (7),
.BR time (7)