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Full Discussion: Look-up USB mounting point
Top Forums Programming Look-up USB mounting point Post 302794147 by wisecracker on Monday 15th of April 2013 09:27:36 AM
Old 04-15-2013
As USB is a hot pluggable _port_ then it is not possible to code for it as a permanent event.

Example...

/dev/ttyUSB0 exists and is up and running and you are in connection with an external device. Some clown comes along and trips over the cable pulling it out whilst in mid flight.

What does your detection code then do?

It says that the _port_ is in use, one of a possible 127 USB devices, but in reality connectivity has been broken...

You can ONLY use your idea IF and only IF you can guarantee no external event to create a _crash_.

Also things occur when you plug your item(s) in AFTER running a language like say Python running from a shell...

It probably will NOT be seen by Python although the shell might see it...

So be very careful before creating auto-detect scripts on dynamic _port_(s)...

Bazza...
 

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platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME
platform::shell - System identification support code and utilities SYNOPSIS
package require platform::shell ?1.1.4? platform::shell::generic shell platform::shell::identify shell platform::shell::platform shell _________________________________________________________________ DESCRIPTION
The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell. This package allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only requirement is that the other shell (identified by its path), is actually executable on the current machine. While for most platform this means that the architecture of the interrogated shell is identical to the architecture of the running shell this is not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run 32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers. For applications like a code repository it is important to identify the architecture of the shell which will actually run the installed packages, versus the architecture of the shell running the repository software. COMMANDS
platform::shell::identify shell This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell. platform::shell::generic shell This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell. platform::shell::platform shell This command returns the contents of tcl_platform(platform) for the specified Tcl shell. KEYWORDS
operating system, cpu architecture, platform, architecture platform::shell 1.1.4 platform::shell(n)
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