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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -1,3 +1,27 @@ +2001-09-26 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * The changes below fix [Bug #462317] where Expect tried to read + more than was in the buffers and then blocked in the OS call as + its pty channel driver provides no blockmodeproc through which + the OS could be notified of blocking-behaviour. Because of this + the general I/O core has to take more care than usual to + preserve the semantics of non-blocking channels. + + * generic/tclIO.c (Tcl_ReadRaw): Do not read from the driver if + the channel is non-blocking and the fileevent causing the read + was generated by a timer. We do not know if there is data + available from the OS. Instead of going to the OS for more and + potentially blocking we simply signal EWOULDBLOCK to the higher + levels to cause the system to wait for true fileevents. + (GetInput): Same as before. + (ChannelTimerProc): Added set and clear of CHANNEL_TIMER_FEV. + + * generic/tclIO.h (CHANNEL_TIMER_FEV): New flag for channels. Is + set if a fileevent was generated by a timer, the channel is not + blocking and the driver did not provide a blockmodeproc. In that + case the I/O core has to be especially careful about going to + the driver for more data. + 2001-09-26 Don Porter <dgp@users.sourceforge.net> * doc/SplitPath.3 (Tcl_GetPathType): |