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1. close.2.man

Manpage of CLOSE

CLOSE

Section: Linux (2)
Updated: 14 2001-12-13 òÕËÏ×ÏÄÓÔ×Ï
Index Return to Main Contents

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close - ÚÁËÒÙÔØ ÆÁÊÌÏ×ÙÊ ÄÅÓËÒÉÐÔÏÒ

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#include <unistd.h>

int close(int fd);

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close ÚÁËÒÙ×ÁÅÔ ÆÁÊÌÏ×ÙÊ ÄÅÓËÒÉÐÔÏÒ, ËÏÔÏÒÙÊ ÐÏÓÌÅ ÜÔÏÇÏ ÎÅ ÓÓÙÌÁÅÔÓÑ ÎÉ ÎÁ ÏÄÉÎ É ÆÁÊÌ É ÍÏÖÅÔ ÂÙÔØ ÉÓÐÏÌØÚÏ×ÁÎ ÐÏ×ÔÏÒÎÏ. ÷ÓÅ ÂÌÏËÉÒÏ×ËÉ, ÎÁÈÏÄÑÝÉÅÓÑ ÎÁ ÓÏÏÔ×ÅÔÓÔ×ÕÀÝÅÍ ÆÁÊÌÅ, ÓÎÉÍÁÀÔÓÑ (ÎÅÚÁ×ÉÓÉÍÏ ÏÔ ÔÏÇÏ, ÂÙÌ ÌÉ ÉÓÐÏÌØÚÏ×ÁÎ ÄÌÑ ÕÓÔÁÎÏ×ËÉ ÂÌÏËÉÒÏ×ËÉ ÉÍÅÎÎÏ ÜÔÏÔ ÆÁÊÌÏ×ÙÊ ÄÅÓËÒÉÐÔÏÒ).

åÓÌÉ fd Ñ×ÌÑÅÔÓÑ ÐÏÓÌÅÄÎÅÊ ËÏÐÉÅÊ ËÁËÏÇÏ-ÌÉÂÏ ÆÁÊÌÏ×ÏÇÏ ÄÅÓËÒÉÐÔÏÒÁ, ÔÏ ÒÅÓÕÒÓÙ, Ó×ÑÚÁÎÎÙÅ Ó ÎÉÍ, ÏÓ×ÏÂÏÖÄÁÀÔÓÑ; ÅÓÌÉ ÄÅÓËÒÉÐÔÏÒ ÂÙÌ ÐÏÓÌÅÄÎÅÊ ÓÓÙÌËÏÊ ÎÁ ÆÁÊÌ, ÕÄÁÌÅÎÎÙÊ Ó ÐÏÍÏÝØÀ unlink(2), ÔÏ ÆÁÊÌ ÏËÏÎÞÁÔÅÌØÎÏ ÕÄÁÌÑÅÔÓÑ.

÷ïú÷òáýáåíïå úîáþåîéå

close ×ÏÚ×ÒÁÝÁÅÔ ÎÏÌØ ÐÒÉ ÕÓÐÅÛÎÏÍ ÚÁ×ÅÒÛÅÎÉÉ ÉÌÉ -1, ÅÓÌÉ ÐÒÏÉÚÏÛÌÁ ÏÛÉÂËÁ.

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EBADF: fd Ñ×ÌÑÅÔÓÑ ÎÅ×ÅÒÎÙÍ ÆÁÊÌÏ×ÙÍ ÄÅÓËÒÉÐÔÏÒÏÍ.
EINTR: óÉÓÔÅÍÎÙÊ ×ÙÚÏ× close() ÂÙÌ ÐÒÅÒ×ÁÎ ÓÉÇÎÁÌÏÍ.
EIO: ðÒÏÉÚÏÛÌÁ ÏÛÉÂËÁ ××ÏÄÁ/×Ù×ÏÄÁ.

óïïô÷åôóô÷éå óôáîäáòôáí

SVr4, SVID, POSIX, X/OPEN, BSD 4.3. SVr4 ÄÏËÕÍÅÎÔÉÒÕÅÔ ÄÏÐÏÌÎÉÔÅÌØÎÙÊ ËÏÄ ÏÛÉÂËÉ ENOLINK.

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îÅ ÐÒÏ×ÅÒÑÔØ ÚÎÁÞÅÎÉÅ, ×ÏÚ×ÒÁÝÁÅÍÏÅ ÆÕÎËÃÉÅÊ close - ÏÂÙÞÎÁÑ, ÎÏ ÏÔ ÜÔÏÇÏ ÎÅ ÍÅÎÅÅ ÓÅÒØÅÚÎÁÑ ÏÛÉÂËÁ ÐÒÏÇÒÁÍÍÉÒÏ×ÁÎÉÑ. ÷ÐÏÌÎÅ ×ÏÚÍÏÖÎÏ, ÞÔÏ ÏÛÉÂËÁ × ÐÒÅÄÙÄÕÝÅÊ ÏÐÅÒÁÃÉÉ write(2) ×ÐÅÒ×ÙÅ ÄÁÓÔ Ï ÓÅÂÅ ÚÎÁÔØ ÐÒÉ ×ÙÐÏÌÎÅÎÉÉ close. ïÔÓÕÔÓÔ×ÉÅ ÐÒÏ×ÅÒËÉ ×ÏÚ×ÒÁÝÁÅÍÏÇÏ ÚÎÁÞÅÎÉÅ ÐÒÉ ÚÁËÒÙÔÉÉ ÆÁÊÌÁ, ÍÏÖÅÔ ÐÒÉ×ÅÓÔÉ Ë ÐÏÔÅÒÅ ÄÁÎÎÙÈ. ïÓÏÂÅÎÎÏ ÜÔÏ ËÁÓÁÅÔÓÑ ÔÁËÉÈ ÁÓÐÅËÔÏ× ËÁË NFS É ÄÉÓËÏ×ÙÅ Ë×ÏÔÙ.

õÓÐÅÛÎÏÅ ×ÙÐÏÌÎÅÎÉÅ close() ÎÅ ÇÁÒÁÎÔÉÒÕÅÔ, ÞÔÏ ÄÁÎÎÙÅ ÕÓÐÅÛÎÏ ÚÁÐÉÓÁÎÙ ÎÁ ÄÉÓË, ÐÏÔÏÍÕ ÞÔÏ ÑÄÒÏ ÏÔËÌÁÄÙ×ÁÅÔ ÚÁÐÉÓØ. ïÂÙÞÎÏ ÆÁÊÌÏ×ÙÅ ÓÉÓÔÅÍÙ ÎÅ ÓÂÒÁÓÙ×ÁÀÔ ÂÕÆÅÒÁ ÎÁ ÄÉÓË ÐÒÉ ÚÁËÒÙÔÉÉ ÐÏÔÏËÁ. åÓÌÉ ×ÁÍ ÎÕÖÎÏ ÕÄÏÓÔÏ×ÅÒÉÔØÓÑ, ÞÔÏ ÄÁÎÎÙÅ ÆÉÚÉÞÅÓËÉ ÓÏÈÒÁÎÅÎÙ ÎÁ ÄÉÓËÅ, ÉÓÐÏÌØÚÕÊÔÅ fsync(2). (÷ ÜÔÏÍ ÓÌÕÞÁÅ ×Ó£ ÂÕÄÅÔ ÚÁ×ÉÓÉÔØ ÏÔ ÖÅÌÅÚÁ É ÓÁÍÏÇÏ ÄÉÓËÁ.)

óíïôòé ôáëöå

open(2), fcntl(2), shutdown(2), unlink(2), fclose(3), fsync(2)

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This document was created by man2html using the manual pages.
Time: 07:39:02 GMT, May 02, 2010

2. close.9.man

Manpage of close

close

Section: Tcl Built-In Commands (n)
Updated: 7.5
Index Return to Main Contents

NAME

close - Close an open channel

SYNOPSIS

close channelId

DESCRIPTION

Closes the channel given by channelId.

ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdin, stdout, or stderr), the return value from an invocation of open or socket, or the result of a channel creation command provided by a Tcl extension.

All buffered output is flushed to the channel's output device, any buffered input is discarded, the underlying file or device is closed, and channelId becomes unavailable for use.

If the channel is blocking, the command does not return until all output is flushed. If the channel is nonblocking and there is unflushed output, the channel remains open and the command returns immediately; output will be flushed in the background and the channel will be closed when all the flushing is complete.

If channelId is a blocking channel for a command pipeline then close waits for the child processes to complete.

If the channel is shared between interpreters, then close makes channelId unavailable in the invoking interpreter but has no other effect until all of the sharing interpreters have closed the channel. When the last interpreter in which the channel is registered invokes close, the cleanup actions described above occur. See the interp command for a description of channel sharing.

Channels are automatically closed when an interpreter is destroyed and when the process exits. Channels are switched to blocking mode, to ensure that all output is correctly flushed before the process exits.

The command returns an empty string, and may generate an error if an error occurs while flushing output. If a command in a command pipeline created with open returns an error, close generates an error (similar to the exec command.)

EXAMPLE

This illustrates how you can use Tcl to ensure that files get closed even when errors happen by combining catch, close and return:


proc withOpenFile {filename channelVar script} {
    upvar 1 $channelVar chan
    set chan [open $filename]
    catch {
        uplevel 1 $script
    } result options
    close $chan
    return -options $options $result
}