summaryrefslogtreecommitdiffstats
path: root/doc
diff options
context:
space:
mode:
authorandreas_kupries <akupries@shaw.ca>2005-08-24 17:56:23 (GMT)
committerandreas_kupries <akupries@shaw.ca>2005-08-24 17:56:23 (GMT)
commitb32c5538015a9a182a54be4f711d0e01feb0a47c (patch)
tree20a737ae03097f905f0e9230c85c04123e5b5894 /doc
parentd1b987be17d4f05e79530f9f0896284fbe354205 (diff)
downloadtcl-b32c5538015a9a182a54be4f711d0e01feb0a47c.zip
tcl-b32c5538015a9a182a54be4f711d0e01feb0a47c.tar.gz
tcl-b32c5538015a9a182a54be4f711d0e01feb0a47c.tar.bz2
TIP#219 IMPLEMENTATION
* doc/SetChanErr.3: ** New File **. Documentation of the new channel API functions. * generic/tcl.decls: Stub declarations of the new channel API. * generic/tclDecls.h: Regenerated * generic/tclStubInit.c: * tclIORChan.c: ** New File **. Implementation of the reflected channel. * generic/tclInt.h: Integration of reflected channel and new error * generic/tclIO.c: propagation into the generic I/O core. * generic/tclIOCmd.c: * generic/tclIO.h: * library/init.tcl: * tests/io.test: Extended testsuite. * tests/ioCmd.test: * tests/chan.test: * generic/tclTest.c: * generic/tclThreadTest.c: * unix/Makefile.in: Integration into the build machinery. * win/Makefile.in: * win/Makefile.vc:
Diffstat (limited to 'doc')
-rw-r--r--doc/SetChanErr.3155
1 files changed, 155 insertions, 0 deletions
diff --git a/doc/SetChanErr.3 b/doc/SetChanErr.3
new file mode 100644
index 0000000..881768f
--- /dev/null
+++ b/doc/SetChanErr.3
@@ -0,0 +1,155 @@
+'\"
+'\" Copyright (c) 2005 Andreas Kupries <andreas_kupries@users.sourceforge.net>
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\"
+'\" RCS: @(#) $Id: SetChanErr.3,v 1.1 2005/08/24 17:56:23 andreas_kupries Exp $
+.so man.macros
+.TH Tcl_SetChannelError 3 8.5 Tcl "Tcl Library Procedures"
+.BS
+'\" Note: do not modify the .SH NAME line immediately below!
+.SH NAME
+Tcl_SetChannelError, Tcl_SetChannelErrorInterp, Tcl_GetChannelError, Tcl_GetChannelErrorInterp \- functions to create/intercept Tcl errors by channel drivers.
+.SH SYNOPSIS
+.nf
+\fB#include <tcl.h>\fR
+.sp
+void
+\fBTcl_SetChannelError\fR(\fIchan, msg\fR)
+.sp
+void
+\fBTcl_SetChannelErrorInterp\fR(\fIinterp, msg\fR)
+.sp
+void
+\fBTcl_GetChannelError\fR(\fIchan, msgPtr\fR)
+.sp
+void
+\fBTcl_GetChannelErrorInterp\fR(\fIinterp, msgPtr\fR)
+.sp
+.SH ARGUMENTS
+.AS Tcl_Channel chan
+.AP Tcl_Channel chan in
+Refers to the Tcl channel whose bypass area is accessed.
+.AP Tcl_Interp* interp in
+Refers to the Tcl interpreter whose bypass area is accessed.
+.AP Tcl_Obj* msg in
+Error message put into a bypass area. A list of return options and
+values, followed by a string message. Both message and the
+option/value information are optional.
+.AP Tcl_Obj** msgPtr out
+Reference to a place where the message stored in the accessed bypass
+area can be stored in.
+.BE
+.SH DESCRIPTION
+.PP
+The current definition of a Tcl channel driver does not permit the
+direct return of arbitrary error messages, except for the setting and
+retrieval of channel options. All other functions are restricted to
+POSIX error codes.
+.PP
+The functions described here overcome this limitation. Channel drivers
+are allowed to use \fBTcl_SetChannelError\fR and
+\fBTcl_SetChannelErrorInterp\fR to place arbitrary error messages in
+\fBbypass areas\fI defined for channels and interpreters. And the
+generic I/O layer uses \fBTcl_GetChannelError\fR and
+\fBTcl_GetChannelErrorInterp\fR to look for messages in the bypass
+areas and arrange for their return as errors. The posix error codes
+set by a driver are used now if and only if no messages are present.
+.PP
+\fBTcl_SetChannelError\fR stores error information in the bypass area
+of the specified channel. The number of references to the \fBmsg\fI
+object goes up by one. Previously stored information will be
+discarded, by releasing the reference held by the channel. The channel
+reference must not be NULL.
+.PP
+\fBTcl_SetChannelErrorInterp\fR stores error information in the bypass
+area of the specified interpreter. The number of references to the
+\fBmsg\fI object goes up by one. Previously stored information will be
+discarded, by releasing the reference held by the interpreter. The
+interpreter reference must not be NULL.
+.PP
+\fBTcl_GetChannelError\fR places either the error message held in the
+bypass area of the specified channel into \fImsgPtr\fR, or NULL; and
+resets the bypass. I.e. after an invokation all following invokations
+will return NULL, until an intervening invokation of
+\fBTcl_SetChannelError\fR with a non-NULL message. The \fImsgPtr\fR
+must not be NULL. The reference count of the message is not touched.
+The reference previously held by the channel is now held by the caller
+of the function and it is its responsibility to release that reference
+when it is done with the object.
+.PP
+\fBTcl_GetChannelErrorInterp\fR places either the error message held
+in the bypass area of the specified interpreter into \fImsgPtr\fR, or
+NULL; and resets the bypass. I.e. after an invokation all following
+invokations will return NULL, until an intervening invokation of
+\fBTcl_SetChannelErrorInterp\fR with a non-NULL message. The
+\fImsgPtr\fR must not be NULL. The reference count of the message is
+not touched. The reference previously held by the interpreter is now
+held by the caller of the function and it is its responsibility to
+release that reference when it is done with the object.
+.PP
+Which functions of a channel driver are allowed to use which bypass
+function is listed below, as is which functions of the public channel
+API may leave a messages in the bypass areas.
+.PP
+.IP \fBTcl_DriverCloseProc\fR
+May use \fBTcl_SetChannelErrorInterp\fR, and only this function.
+.IP \fBTcl_DriverInputProc\fR
+May use \fBTcl_SetChannelError\fR, and only this function.
+.IP \fBTcl_DriverOutputProc\fR
+May use \fBTcl_SetChannelError\fR, and only this function.
+.IP \fBTcl_DriverSeekProc\fR
+May use \fBTcl_SetChannelError\fR, and only this function.
+.IP \fBTcl_DriverWideSeekProc
+May use \fBTcl_SetChannelError\fR, and only this function.
+.IP \fBTcl_DriverSetOptionProc\fR
+Has already the ability to pass arbitrary error messages. Must
+\fBnot\fR use any of the new functions.
+.IP \fBTcl_DriverGetOptionProc\fR
+Has already the ability to pass arbitrary error messages. Must
+\fBnot\fR use any of the new functions.
+.IP \fBTcl_DriverWatchProc\fR
+Must \fBnot\fR use any of the new functions. Is internally called and
+has no ability to return any type of error whatsoever.
+.IP \fBTcl_DriverBlockModeProc\fR
+May use \fBTcl_SetChannelError\fR, and only this function.
+.IP \fBTcl_DriverGetHandleProc\fR
+Must \fBnot\fR use any of the new functions. It is only a low-level
+function, and not used by Tcl commands.
+.IP \fBTcl_DriverHandlerProc\fR
+Must \fBnot\fR use any of the new functions. Is internally called and
+has no ability to return any type of error whatsoever.
+.PP
+Given the information above the following public functions of the Tcl
+C API are affected by these changes. I.e. when these functions are
+called the channel may now contain a stored arbitrary error message
+requiring processing by the caller.
+.PP
+.IP \fBTcl_StackChannel\fR
+.IP \fBTcl_Seek\fR
+.IP \fBTcl_Tell\fR
+.IP \fBTcl_ReadRaw\fR
+.IP \fBTcl_Read\fR
+.IP \fBTcl_ReadChars\fR
+.IP \fBTcl_Gets\fR
+.IP \fBTcl_GetsObj\fR
+.IP \fBTcl_Flush\fR
+.IP \fBTcl_WriteRaw\fR
+.IP \fBTcl_WriteObj\fR
+.IP \fBTcl_Write\fR
+.IP \fBTcl_WriteChars\fR
+.PP
+All other API functions are unchanged. Especially the functions below
+leave all their error information in the interpreter result.
+.PP
+.IP \fBTcl_Close\fR
+.IP \fBTcl_UnregisterChannel\fR
+.IP \fBTcl_UnstackChannel\fR
+.PP
+
+.SH "SEE ALSO"
+Tcl_Close(3), Tcl_OpenFileChannel(3), Tcl_SetErrno(3)
+
+.SH KEYWORDS
+channel driver, error messages, channel type