diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 36 |
1 files changed, 36 insertions, 0 deletions
@@ -65783,6 +65783,42 @@ description of the .code close-stream stream I/O function. +With two exceptions, the value returned from +.code close +is retained by close-stream, such that repeated calls to +.code close-stream +then return that value without calling the +.code close +method. +The exceptions are the values +.code nil +and +.code : +(the colon symbol). +If either of these values is returned, and +.code close-stream +is invoked again on the same stream object, the +.code close +method will be called again. + +Furthermore, if the +.code : +symbol is returned by the +.code close +method, this indicates a successful close, and the +.code close-stream +function returns the +.code t +symbol rather than the +.code : +symbol. + +The rationale for this mechanism is that it supports reference-counted +closing. A struct delegate stream may be written which is shared by +several owners, which must each call +.code close-stream +before the underlying real stream is closed. + .coNP Method @ flush .synb .mets << stream .(flush < offs << whence ) |