Ttyhog Over-run Post: 302139314

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Operating Systems AIX Ttyhog Over-run Post 302139314 by ravager on Friday 5th of October 2007 09:44:38 AM

10-05-2007

Registered User

The error TTY_TTYHOG indicates that the sending device is ignoring flow control. This error occurs after the hardware FIFO has been accessed and
has written to the software buffer the tty hog error is logged because the buffer where incoming characters are placed is overflowing. When the buffer is about
3/4's full, the device driver notifies the hardware , to send the XOFF char to the sender to stop send data (or drop the hardware control line)

If the sender continues to send data, and the buffer is not emptied, the device driver flushes the buffer and logs the error message in the
error log.

For example, say in a telnet session we enter more than 512 characters and hit enter. We could fill up our recv buffer on the adapter and the
device driver will send su the XOFF command. However, if we ignore this and continue to send the block data, we will log this error in errpt.

You cold try to update bos.rte.tty to a later version and also may want to run the command to set the baut rate to 9600 on the serial port
chdev -l tty1 -a speed=9600 -a flow_disp=rts -P

ravager

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pvm_setsbuf

SETSBUF(3PVM)							  PVM Version 3.4						     SETSBUF(3PVM)

NAME

       pvm_setsbuf - Switches the active send buffer.

SYNOPSIS

       C    int oldbuf = pvm_setsbuf( int bufid )

       Fortran	 call pvmfsetsbuf( bufid, oldbuf )

PARAMETERS

       bufid   Integer the message buffer identifier for the new active send buffer.  A value of 0 indicates the default receive buffer.

       oldbuf  Integer returning the message buffer identifier for the previous active send buffer.

DESCRIPTION

       The  routine  pvm_setsbuf  switches the active send buffer to bufid and saves the previous active send buffer oldbuf.  If bufid is set to 0
       then the present active send buffer is saved and no active send buffer exists.

       The routine is required when managing multiple message buffers.	For example switching back and forth  between  two  buffers.   One  buffer
       could be used to send information to a graphical interface while a second buffer could be used send data to other tasks in the application.

EXAMPLES

       C:
	    sbuf1 = pvm_setsbuf( sbuf2 );
       Fortran:
	    CALL PVMFSETSBUF( NEWBUF, OLDBUF )

ERRORS

       These error conditions can be returned by pvm_setsbuf

       PvmBadParam
	      giving an invalid bufid.

       PvmNoSuchBuf
	      switching to a non-existent message buffer.

SEE ALSO

       pvm_setrbuf(3PVM)

								  30 August, 1993						     SETSBUF(3PVM)

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