diff options
Diffstat (limited to 'doc/OpenFileChnl.3')
| -rw-r--r-- | doc/OpenFileChnl.3 | 44 |
1 files changed, 7 insertions, 37 deletions
diff --git a/doc/OpenFileChnl.3 b/doc/OpenFileChnl.3 index 0d722f6..337a9a9 100644 --- a/doc/OpenFileChnl.3 +++ b/doc/OpenFileChnl.3 @@ -98,10 +98,8 @@ Tcl_WideInt Tcl_WideInt \fBTcl_Tell\fR(\fIchannel\fR) .sp -.VS 8.5 int \fBTcl_TruncateChannel\fR(\fIchannel, length\fR) -.VE 8.5 .sp int \fBTcl_GetChannelOption\fR(\fIinterp, channel, optionName, optionValue\fR) @@ -211,7 +209,6 @@ values. Must have been initialized by the caller. .AP "const char" *newValue in New value for the option given by \fIoptionName\fR. .BE - .SH DESCRIPTION .PP The Tcl channel mechanism provides a device-independent and @@ -229,7 +226,6 @@ The procedures described in this manual entry comprise the C APIs of the generic layer of the channel architecture. For a description of the channel driver architecture and how to implement channel drivers for new types of channels, see the manual entry for \fBTcl_CreateChannel\fR. - .SH TCL_OPENFILECHANNEL .PP \fBTcl_OpenFileChannel\fR opens a file specified by \fIfileName\fR and @@ -248,10 +244,9 @@ be used in preference to \fBTcl_OpenFileChannel\fR wherever possible. .PP The newly created channel is not registered in the supplied interpreter; to register it, use \fBTcl_RegisterChannel\fR, described below. -If one of the standard channels, \fBstdin, stdout\fR or \fBstderr\fR was +If one of the standard channels, \fBstdin\fR, \fBstdout\fR or \fBstderr\fR was previously closed, the act of creating the new channel also assigns it as a replacement for the standard channel. - .SH TCL_OPENCOMMANDCHANNEL .PP \fBTcl_OpenCommandChannel\fR provides a C-level interface to the @@ -286,20 +281,18 @@ the interpreter's result if \fIinterp\fR is not NULL. .PP The newly created channel is not registered in the supplied interpreter; to register it, use \fBTcl_RegisterChannel\fR, described below. -If one of the standard channels, \fBstdin, stdout\fR or \fBstderr\fR was +If one of the standard channels, \fBstdin\fR, \fBstdout\fR or \fBstderr\fR was previously closed, the act of creating the new channel also assigns it as a replacement for the standard channel. - .SH TCL_MAKEFILECHANNEL .PP \fBTcl_MakeFileChannel\fR makes a \fBTcl_Channel\fR from an existing, platform-specific, file handle. The newly created channel is not registered in the supplied interpreter; to register it, use \fBTcl_RegisterChannel\fR, described below. -If one of the standard channels, \fBstdin, stdout\fR or \fBstderr\fR was +If one of the standard channels, \fBstdin\fR, \fBstdout\fR or \fBstderr\fR was previously closed, the act of creating the new channel also assigns it as a replacement for the standard channel. - .SH TCL_GETCHANNEL .PP \fBTcl_GetChannel\fR returns a channel given the \fIchannelName\fR used to @@ -317,7 +310,6 @@ according to the \fIpattern\fR. If \fIpattern\fR is NULL, then it will not do any filtering. The return value is \fBTCL_OK\fR if no errors occurred writing to the result, otherwise it is \fBTCL_ERROR\fR, and the error message is left in the interpreter's result. - .SH TCL_REGISTERCHANNEL .PP \fBTcl_RegisterChannel\fR adds a channel to the set of channels accessible @@ -342,7 +334,6 @@ call to \fBTcl_RegisterChannel\fR, they will get initialized by that call. See \fBTcl_StandardChannels\fR for a general treatise about standard channels and the behaviour of the Tcl library with regard to them. - .SH TCL_UNREGISTERCHANNEL .PP \fBTcl_UnregisterChannel\fR removes a channel from the set of channels @@ -357,14 +348,13 @@ that it no longer holds a reference to that channel. If this is the last reference to the channel, it will now be closed. \fBTcl_UnregisterChannel\fR is very similar to \fBTcl_DetachChannel\fR except that it will also close the channel if no further references to it exist. - .SH TCL_DETACHCHANNEL .PP \fBTcl_DetachChannel\fR removes a channel from the set of channels accessible in \fIinterp\fR. After this call, Tcl programs will no longer be able to use the channel's name to refer to the channel in that interpreter. Beyond that, this command has no further effect. It cannot be used on -the standard channels (stdout, stderr, stdin), and will return +the standard channels (\fBstdout\fR, \fBstderr\fR, \fBstdin\fR), and will return \fBTCL_ERROR\fR if passed one of those channels. .PP Code not associated with a Tcl interpreter can call @@ -372,16 +362,14 @@ Code not associated with a Tcl interpreter can call that it no longer holds a reference to that channel. If this is the last reference to the channel, unlike \fBTcl_UnregisterChannel\fR, it will not be closed. - .SH TCL_ISSTANDARDCHANNEL .PP \fBTcl_IsStandardChannel\fR tests whether a channel is one of the -three standard channels, stdin, stdout or stderr. If so, it returns -1, otherwise 0. +three standard channels, \fBstdin\fR, \fBstdout\fR or \fBstderr\fR. +If so, it returns 1, otherwise 0. .PP No attempt is made to check whether the given channel or the standard channels are initialized or otherwise valid. - .SH TCL_CLOSE .PP \fBTcl_Close\fR destroys the channel \fIchannel\fR, which must denote a @@ -411,7 +399,6 @@ been given as the \fBchan\fR argument in a call to \fBTcl_UnregisterChannel\fR, which will internally call \fBTcl_Close\fR when all calls to \fBTcl_RegisterChannel\fR have been matched by corresponding calls to \fBTcl_UnregisterChannel\fR. - .SH "TCL_READCHARS AND TCL_READ" .PP \fBTcl_ReadChars\fR consumes bytes from \fIchannel\fR, converting the bytes @@ -472,7 +459,6 @@ stack the supplied channel is part of, \fBTcl_ReadRaw\fR does not. Thus this function is \fBonly\fR usable for transformational channel drivers, i.e. drivers used in the middle of a stack of channels, to move data from the channel below into the transformation. - .SH "TCL_GETSOBJ AND TCL_GETS" .PP \fBTcl_GetsObj\fR consumes bytes from \fIchannel\fR, converting the bytes to @@ -499,7 +485,6 @@ of input unavailability. \fBTcl_Gets\fR is the same as \fBTcl_GetsObj\fR except the resulting characters are appended to the dynamic string given by \fIlineRead\fR rather than a Tcl object. - .SH "TCL_UNGETS" .PP \fBTcl_Ungets\fR is used to add data to the input queue of a channel, @@ -512,7 +497,6 @@ head of the queue. If \fIchannel\fR has a EOF set, no data will be added to the input queue. \fBTcl_Ungets\fR returns \fIinputLen\fR or \-1 if an error occurs. - .SH "TCL_WRITECHARS, TCL_WRITEOBJ, AND TCL_WRITE" .PP \fBTcl_WriteChars\fR accepts \fIbytesToWrite\fR bytes of character data at @@ -567,7 +551,6 @@ not. Thus this function is \fBonly\fR usable for transformational channel drivers, i.e. drivers used in the middle of a stack of channels, to move data from the transformation into the channel below it. - .SH TCL_FLUSH .PP \fBTcl_Flush\fR causes all of the buffered output data for \fIchannel\fR @@ -581,7 +564,6 @@ eventually, as fast as the channel is able to absorb it. The return value is normally \fBTCL_OK\fR. If an error occurs, \fBTcl_Flush\fR returns \fBTCL_ERROR\fR and records a POSIX error code that can be retrieved with \fBTcl_GetErrno\fR. - .SH TCL_SEEK .PP \fBTcl_Seek\fR moves the access point in \fIchannel\fR where subsequent @@ -592,20 +574,15 @@ buffered input is discarded, prior to the seek operation. If an error occurs, \fBTcl_Seek\fR returns \-1 and records a POSIX error code that can be retrieved with \fBTcl_GetErrno\fR. After an error, the access point may or may not have been moved. - .SH TCL_TELL .PP \fBTcl_Tell\fR returns the current access point for a channel. The returned value is \-1 if the channel does not support seeking. - .SH TCL_TRUNCATECHANNEL .PP -.VS 8.5 \fBTcl_TruncateChannel\fR truncates the file underlying \fIchannel\fR to a given \fIlength\fR of bytes. It returns \fBTCL_OK\fR if the operation succeeded, and \fBTCL_ERROR\fR otherwise. -.VE 8.5 - .SH TCL_GETCHANNELOPTION .PP \fBTcl_GetChannelOption\fR retrieves, in \fIoptionValue\fR, the value of one of @@ -627,7 +604,6 @@ for the Tcl \fBsocket\fR command. The procedure normally returns \fBTCL_OK\fR. If an error occurs, it returns \fBTCL_ERROR\fR and calls \fBTcl_SetErrno\fR to store an appropriate POSIX error code. - .SH TCL_SETCHANNELOPTION .PP \fBTcl_SetChannelOption\fR sets a new value \fInewValue\fR @@ -635,30 +611,26 @@ for an option \fIoptionName\fR on \fIchannel\fR. The procedure normally returns \fBTCL_OK\fR. If an error occurs, it returns \fBTCL_ERROR\fR; in addition, if \fIinterp\fR is non-NULL, \fBTcl_SetChannelOption\fR leaves an error message in the interpreter's result. - .SH TCL_EOF .PP \fBTcl_Eof\fR returns a nonzero value if \fIchannel\fR encountered an end of file during the last input operation. - .SH TCL_INPUTBLOCKED .PP \fBTcl_InputBlocked\fR returns a nonzero value if \fIchannel\fR is in nonblocking mode and the last input operation returned less data than requested because there was insufficient data available. The call always returns zero if the channel is in blocking mode. - .SH TCL_INPUTBUFFERED .PP \fBTcl_InputBuffered\fR returns the number of bytes of input currently buffered in the internal buffers for a channel. If the channel is not open for reading, this function always returns zero. - .SH TCL_OUTPUTBUFFERED +.PP \fBTcl_OutputBuffered\fR returns the number of bytes of output currently buffered in the internal buffers for a channel. If the channel is not open for writing, this function always returns zero. - .SH "PLATFORM ISSUES" .PP The handles returned from \fBTcl_GetChannelHandle\fR depend on the @@ -669,10 +641,8 @@ the channel was created with \fBTcl_OpenFileChannel\fR, \fBTcl_OpenCommandChannel\fR, or \fBTcl_MakeFileChannel\fR. Other channel types may return a different type of handle on Windows platforms. - .SH "SEE ALSO" DString(3), fconfigure(n), filename(n), fopen(3), Tcl_CreateChannel(3) - .SH KEYWORDS access point, blocking, buffered I/O, channel, channel driver, end of file, flush, input, nonblocking, output, read, seek, write |