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OpenDarwin 7.2.1 - man page for close (opendarwin section n)

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close(n)			      Tcl Built-In Commands				 close(n)

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NAME
       close - Close an open channel.

SYNOPSIS
       close channelId
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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 dis-
       carded, 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.

SEE ALSO
       file(n), open(n), socket(n), eof(n), Tcl_StandardChannels(3)

KEYWORDS
       blocking, channel, close, nonblocking

Tcl					       7.5					 close(n)
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