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IOCTL Linux device driver [closed]
... a driver can define an ioctl which allows a userspace application to send it orders. However, ioctls are not very flexible and tend to get a bit cluttered (dozens of "magic numbers" which just work... or not), and can also be insecure, as you pass a buffer into the kernel - bad handling can break t...
What is the documents directory (NSDocumentDirectory)?
...xplain to me what the documents directory is on an iOS app and when to use it?
9 Answers
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How to pick just one item from a generator?
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Create a generator using
g = myfunct()
Everytime you would like an item, use
next(g)
(or g.next() in Python 2.5 or below).
If the generator exits, it will raise StopIteration. You can either catch this exception if necessary, or use the default argument to next():
next(g, default_value...
top -c command in linux to filter processes listed based on processname
...eparated list of pids so we use -d',' in pgrep. The -f flag in pgrep makes it match the command line instead of program name.
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GET URL parameter in PHP
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$_GET is not a function or language construct—it's just a variable (an array). Try:
<?php
echo $_GET['link'];
In particular, it's a superglobal: a built-in variable that's populated by PHP and is available in all scopes (you can use it from inside a function withou...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
...t to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users. Even if a user tampers with the field’s value submitted to the server, it will be ignored in favor of the value from the form’s initial data.
With Django 1.8 and earlier, to disable entr...
How to avoid circular imports in Python? [duplicate]
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Doesn't seem to work with submodules import foobar.mod_a and import foobar.mod_b doesn't work like described above.
– Nick
Oct 2 '13 at 0:39
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history.replaceState() example?
...eed this is a bug, although intentional for 2 years now.
The problem lies with some unclear specs and the complexity when document.title and back/forward are involved.
See bug reference on Webkit and Mozilla.
Also Opera on the introduction of History API said it wasn't using the title parameter and...
ipython reads wrong python version
I've been having trouble with Python, iPython and the libraries. The following points show the chain of the problematics. I'm running Python 2.7 on Mac Lion.
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Combining C++ and C - how does #ifdef __cplusplus work?
...m working on a project that has a lot of legacy C code. We've started writing in C++, with the intent to eventually convert the legacy code, as well. I'm a little confused about how the C and C++ interact. I understand that by wrapping the C code with extern "C" the C++ compiler will not ...