Tcl Source Code

     * First check that there are bytes in it.  If so then...
     * If the output queue is empty, then yes, trusting the caller called
     * us only when written bytes ought to be flushed.
     * If the current output buffer is full, then yes, so we can meet
     * the post-condition that on a successful return to caller we've
     * left space in the current output buffer for more writing (the flush
     * call was to make new room).


     * Otherwise, no.  Keep the current output buffer where it is so more
     * can be written to it, possibly filling it, to promote more efficient
     * buffer usage.
     */

    bufPtr = statePtr->curOutPtr;
    if (bufPtr && BytesLeft(bufPtr) && /* Keep empties off queue */
	    (statePtr->outQueueHead == NULL || IsBufferFull(bufPtr))) {

	if (statePtr->outQueueHead == NULL) {
	    statePtr->outQueueHead = bufPtr;
	} else {
	    statePtr->outQueueTail->nextPtr = bufPtr;
	}
	statePtr->outQueueTail = bufPtr;
	statePtr->curOutPtr = NULL;

     * First check that there are bytes in it.  If so then...
     * If the output queue is empty, then yes, trusting the caller called
     * us only when written bytes ought to be flushed.
     * If the current output buffer is full, then yes, so we can meet
     * the post-condition that on a successful return to caller we've
     * left space in the current output buffer for more writing (the flush
     * call was to make new room).
     * If the channel is blocking, then yes, so we guarantee that 
     * blocking flushes actually flush all pending data.
     * Otherwise, no.  Keep the current output buffer where it is so more
     * can be written to it, possibly filling it, to promote more efficient
     * buffer usage.
     */

    bufPtr = statePtr->curOutPtr;
    if (bufPtr && BytesLeft(bufPtr) && /* Keep empties off queue */
	    (statePtr->outQueueHead == NULL || IsBufferFull(bufPtr)
		    || !GotFlag(statePtr, CHANNEL_NONBLOCKING))) {
	if (statePtr->outQueueHead == NULL) {
	    statePtr->outQueueHead = bufPtr;
	} else {
	    statePtr->outQueueTail->nextPtr = bufPtr;
	}
	statePtr->outQueueTail = bufPtr;
	statePtr->curOutPtr = NULL;

    fconfigure $f1 -blocking 0
    puts $f1 $big
    flush $f1
    after 500
    set result ""
    fileevent $f1 read [namespace code {
	append result [read $f1 1024]
	if {[string length $result] >= [string length $big]} {
	    set x done
	}
    }]
    vwait [namespace which -variable x]
    close $f1
    set big {}
    set x
} done































set result {}
proc FcopyTestAccept {sock args} {
    after 1000 "close $sock"
}
proc FcopyTestDone {bytes {error {}}} {
    variable fcopyTestDone
    if {[string length $error]} {

    fconfigure $f1 -blocking 0
    puts $f1 $big
    flush $f1
    after 500
    set result ""
    fileevent $f1 read [namespace code {
	append result [read $f1 1024]
	if {[string length $result] >= [string length $big]+1} {
	    set x done
	}
    }]
    vwait [namespace which -variable x]
    close $f1
    set big {}
    set x
} done
test io-53.4.1 {Bug 894da183c8} {stdio fcopy} {
    set big bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\n
    variable x
    for {set x 0} {$x < 12} {incr x} {
	append big $big
    }
    file delete $path(pipe)
    set f1 [open $path(pipe) w]
    puts $f1 [list file delete $path(test1)]
    puts $f1 {
	puts ready
	set f [open io-53.4.1 w]
	fcopy stdin $f -command { set x }
	vwait x
	close $f
    }
    puts $f1 "close \[[list open $path(test1) w]]"
    close $f1
    set f1 [open "|[list [interpreter] $path(pipe)]" r+]
    set result [gets $f1]
    fconfigure $f1 -blocking 0 -buffersize 125000
    puts $f1 $big
    fconfigure $f1 -blocking 1
    close $f1
    set big {}
    while {[catch {glob $path(test1)}]} {after 50}
    file delete $path(test1)
    set check [file size io-53.4.1]
    file delete io-53.4.1
    set check
} 266241
set result {}
proc FcopyTestAccept {sock args} {
    after 1000 "close $sock"
}
proc FcopyTestDone {bytes {error {}}} {
    variable fcopyTestDone
    if {[string length $error]} {