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Operating Systems Linux Ubuntu How to implement TIOCOUTQ for USB modem on Linux Ubuntu Post 302526771 by Corona688 on Wednesday 1st of June 2011 12:17:18 PM
Old 06-01-2011
Quote:
Originally Posted by SDoroshenko
Looks like I'd have to ask modem manufacturers if their modems can return how much data are inside modem buffer....
Or read and understand the device driver source code. That's likely to be quite difficult unfortunately.

If these are binary drivers without source code, you're wholly out of luck.
Quote:
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?
Transfers it to the USB drivers. USB has its own protocol, etc. quite unrelated to whatever serial buffers the device might have.

What do you need TIOCOUTQ for? Might there be a workaround that doesn't involve bare-metal hardware driver hacking?
 

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ubuntu-dev-tools(5)						File Formats Manual					       ubuntu-dev-tools(5)

NAME
ubuntu-dev-tools - Configuration for the ubuntu-dev-tools package. DESCRIPTION
The ubuntu-dev-tools package is similar in scope to the devscripts(1) package, providing a collection of scripts which may be of use to Ubuntu and Debian developers or others wishing to build Debian packages. Some of these scripts have options which may be configured on a system-wide and per-user basis. These options are configured in devscripts.conf(5). All variables are described in the script's manpages. Package-wide variables begin with "UBUNTUTOOLS" and are listed below. Every script which reads the configuration files can be forced to ignore them by using the --no-conf command-line option. ENVIRONMENT
All ubuntu-dev-tools configuration variables can be set (and overridden) by setting them in the environment (unlike devscripts). In addition, several scripts use the following environment variables: UBUMAIL Overrides DEBEMAIL and DEBFULLNAME when the target is clearly Ubuntu. Can either contain an e-mail address or Full Name <email@example.org>. DEBEMAIL, DEBFULLNAME As in devscripts(1). PACKAGE-WIDE VARIABLES The currently recognised package-wide variables are: UBUNTUTOOLS_BUILDER This specifies the preferred test-builder, one of pbuilder (default), sbuild, pbuilder-dist. UBUNTUTOOLS_DEBIAN_MIRROR The preferred Debian archive mirror. Should be of the form http://ftp.debian.org/debian (no trailing slash). If not specified, the master will be used. UBUNTUTOOLS_DEBSEC_MIRROR The preferred Debian security archive mirror. Should be of the form http://security.debian.org (no trailing slash). If not speci- fied, the master will be used. UBUNTUTOOLS_UBUNTU_MIRROR The preferred Ubuntu archive mirror. Should be of the form http://archive.ubuntu.com/ubuntu (no trailing slash). If not specified, the master will be used. UBUNTUTOOLS_UBUNTU_PORTS_MIRROR The preferred Ubuntu archive mirror. Should be of the form http://ports.ubuntu.com (no trailing slash). If not specified, the mas- ter will be used. UBUNTUTOOLS_LPINSTANCE The launchpad instance to communicate with. e.g. production (default) or staging. UBUNTUTOOLS_MIRROR_FALLBACK Whether or not to fall-back to the master archive mirror. This is usually the desired behaviour, as mirrors can lag the masters. If on a private network with only a local mirror, you may want to set this to no. One of yes (default) or no. UBUNTUTOOLS_UPDATE_BUILDER Whether or not to update the test-builder before each test build. One of yes or no (default). UBUNTUTOOLS_WORKDIR The directory to use for preparing source packages etc. When unset, defaults to a directory in /tmp/ named after the script. SEE ALSO
devscripts(1), devscripts.conf(5) AUTHORS
This manpage was written by Stefano Rivera <stefanor@ubuntu.com>. ubuntu-dev-tools December 19 2010 ubuntu-dev-tools(5)
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