diff options
Diffstat (limited to 'doc/CrtChannel.3')
| -rw-r--r-- | doc/CrtChannel.3 | 46 |
1 files changed, 39 insertions, 7 deletions
diff --git a/doc/CrtChannel.3 b/doc/CrtChannel.3 index 354665a..dbec17b 100644 --- a/doc/CrtChannel.3 +++ b/doc/CrtChannel.3 @@ -4,7 +4,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" SCCS: @(#) CrtChannel.3 1.29 97/06/20 13:37:45 +'\" SCCS: @(#) CrtChannel.3 1.30 97/12/11 13:10:02 .so man.macros .TH Tcl_CreateChannel 3 8.0 Tcl "Tcl Library Procedures" .BS @@ -221,16 +221,19 @@ typedef struct Tcl_ChannelType { Tcl_DriverGetOptionProc *\fIgetOptionProc\fR; Tcl_DriverWatchProc *\fIwatchProc\fR; Tcl_DriverGetHandleProc *\fIgetHandleProc\fR; + Tcl_DriverClose2Proc *\fIclose2Proc\fR; } Tcl_ChannelType; .CE .VE .PP The driver must provide implementations for all functions except -\fIblockModeProc\fR, \fIseekProc\fR, \fIsetOptionProc\fR, and -\fIgetOptionProc\fR, which may be specified as NULL to indicate that the -channel does not support seeking. Other functions that can not be -implemented for this type of device should return \fBEINVAL\fR when invoked -to indicate that they are not implemented. +\fIblockModeProc\fR, \fIseekProc\fR, \fIsetOptionProc\fR, +.VS +\fIgetOptionProc\fR, and \fIclose2Proc\fR, which may be specified as +.VE +NULL. Other functions that can not be implemented for this type of +device should return \fBEINVAL\fR when invoked to indicate that they +are not implemented. .SH TYPENAME .PP @@ -264,7 +267,7 @@ For some device types, the blocking and nonblocking behavior can be implemented by the underlying operating system; for other device types, the behavior must be emulated in the channel driver. -.SH CLOSEPROC +.SH CLOSEPROC AND CLOSE2PROC .PP The \fIcloseProc\fR field contains the address of a function called by the generic layer to clean up driver-related information when the channel is @@ -286,6 +289,35 @@ calling the \fIcloseProc\fR. If the close operation is successful, the procedure should return zero; otherwise it should return a nonzero POSIX error code. In addition, if an error occurs and \fIinterp\fR is not NULL, the procedure should store an error message in \fIinterp->result\fR. +.PP +.VS +Alternatively, channels that support closing the read and write sides +independently may set \fIcloseProc\fR to \fBTCL_CLOSE2PROC\fR and set +\fIclose2Proc\fR to the address of a function that matches the +following prototype: +.PP +.CS +typedef int Tcl_DriverClose2Proc( + ClientData \fIinstanceData\fR, + Tcl_Interp *\fIinterp\fR, + int \fIflags\fR); +.CE +.PP +The \fIclose2Proc\fR will be called with \fIflags\fR set to an OR'ed +combination of \fBTCL_CLOSE_READ\fR or \fBTCL_CLOSE_WRITE\fR to +indicate that the driver should close the read and/or write side of +the channel. The channel driver may be invoked to perform +additional operations on the channel after \fIclose2Proc\fR is +called to close one or both sides of the channel. If \fIflags\fR is +\fB0\fR (zero), the driver should close the channel in the manner +described above for \fIcloseProc\fR. No further operations will be +invoked on this instance after \fIclose2Proc\fR is called with all +flags cleared. In all cases, the \fIclose2Proc\fR function should +return zero if the close operation was successful; otherwise it should +return a nonzero POSIX error code. In addition, if an error occurs and +\fIinterp\fR is not NULL, the procedure should store an error message +in \fIinterp->result\fR. +.VE .SH INPUTPROC .PP |