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Operating Systems Linux Ubuntu How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post 302526768 by SDoroshenko on Wednesday 1st of June 2011 12:11:49 PM
Old 06-01-2011
Quote:
Originally Posted by Corona688
The modem must have a way to inform the Linux kernel when to send data or when not to send data but this depends on the hardware.
Looks like I'd have to ask modem manufacturers if their modems can return how much data are inside modem buffer....
usb_submit_urb puts data to HCD (Host Controller Driver). Does HCD put data to device directly, or it transfers data to the next level of Linux kernel?



Quote:
Originally Posted by Corona688
Not necessarily. For some hardware it might be the other way around -- the modem might tell Linux when the buffer is full or not full.
Is there at least one modem that returns buffer size information?
 

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FAXLOCK(8)                                                    System Manager's Manual                                                   FAXLOCK(8)

NAME
faxlock - tell a HylaFAX server to switch to LOCKWAIT state SYNOPSIS
/usr/sbin/faxlock [ -q dir ] modem DESCRIPTION
faxlock sends a message to a HylaFAX faxgetty(8) process servicing modem telling it to change its state to LOCKWAIT The specified modem can either be the name (typically the last component of the terminal port the modem is attached to), or the full name of the associated FIFO named pipe file, e.g. ``FIFO.ttym2''. OPTIONS
-q dir Use a spooling area other than /var/spool/hylafax. NOTES
When faxgetty changes it's state to LOCKWAIT, it will start looking for the UUCP lockfile for the device, and when the device is no longer locked, proceed to re-initialize the modem. FILES
/var/spool/hylafax default spooling area /var/spool/hylafax/FIFO fifo for contacting faxq Consult hylafax-server(5) for a complete discussion of the structure and content of the spooling area. SEE ALSO
hylafax-server(5), faxq(8), faxgetty(8) March 3, 1995 FAXLOCK(8)
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