flush(1t) [opensolaris man page]

flush(1T)						       Tcl Built-In Commands							 flush(1T)

__________________________________________________________________________________________________________________________________________________

NAME

       flush - Flush buffered output for a channel

SYNOPSIS

       flush channelId
_________________________________________________________________

DESCRIPTION

       Flushes any output that has been buffered for channelId.

       ChannelId  must be an identifier for an open channel such as a Tcl standard channel (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.  The channel must have been opened for writing.

       If the channel is in blocking mode the command does not return until all the buffered output has been flushed to the channel. If the  chan-
       nel  is in nonblocking mode, the command may return before all buffered output has been flushed; the remainder will be flushed in the back-
       ground as fast as the underlying file or device is able to absorb it.

EXAMPLE

       Prompt for the user to type some information in on the console:
	      puts -nonewline "Please type your name: "
	      flush stdout
	      gets stdin name
	      puts "Hello there, $name!"

SEE ALSO

       file(1T), open(1T), socket(1T), Tcl_StandardChannels(3TCL)

KEYWORDS

       blocking, buffer, channel, flush, nonblocking, output

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl									7.5								 flush(1T)

close(1T)						       Tcl Built-In Commands							 close(1T)

__________________________________________________________________________________________________________________________________________________

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  pipe-
       line 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
	      }

SEE ALSO

       file(1T), open(1T), socket(1T), eof(1T), Tcl_StandardChannels(3TCL)

KEYWORDS

       blocking, channel, close, nonblocking

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl									7.5								 close(1T)