diff options
Diffstat (limited to 'generic/tclIORChan.c')
| -rw-r--r-- | generic/tclIORChan.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c index 10d0b2e..b57d157 100644 --- a/generic/tclIORChan.c +++ b/generic/tclIORChan.c @@ -15,7 +15,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclIORChan.c,v 1.29 2008/04/04 16:46:57 andreas_kupries Exp $ + * RCS: @(#) $Id: tclIORChan.c,v 1.30 2008/04/04 17:18:31 andreas_kupries Exp $ */ #include <tclInt.h> @@ -434,6 +434,7 @@ static const char *msg_read_unsup = "{read not supported by Tcl driver}"; static const char *msg_read_toomuch = "{read delivered more than requested}"; static const char *msg_write_unsup = "{write not supported by Tcl driver}"; static const char *msg_write_toomuch = "{write wrote more than requested}"; +static const char *msg_write_nothing = "{write wrote nothing}"; static const char *msg_seek_beforestart = "{Tried to seek before origin}"; #ifdef TCL_THREADS static const char *msg_send_originlost = "{Origin thread lost}"; @@ -1290,7 +1291,17 @@ ReflectOutput( Tcl_DecrRefCount(resObj); /* Remove reference held from invoke */ - if ((written == 0) || (toWrite < written)) { + if ((written == 0) && (toWrite > 0)) { + /* + * The handler claims to have written nothing of what it was + * given. That is bad. + */ + + SetChannelErrorStr(rcPtr->chan, msg_write_nothing); + *errorCodePtr = EINVAL; + return -1; + } + if (toWrite < written) { /* * The handler claims to have written more than it was given. That is * bad. Note that the I/O core would crash if we were to return this |