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Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?
...root, but anything that is required to run the compiled programs should be included. While there are utilities that help with this, it's still not trivial.
You have to maintain the chroot. Since it is independent, the chroot files will not be updated along with your distribution. You will have to ei...
Stopping python using ctrl+c
...n't specify which exceptions it should catch, it will catch all exceptions including the KeyboardInterrupt that you just caused. A properly coded python program will make use of the python exception hierarchy and only catch exceptions that are derived from Exception.
#This is the wrong way to do t...
Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML
...
Yes, many.
Including, but not limited to:
non breaking space :   or  
narrow no-break space :   (no character reference available)
en space :   or  
em space :   or  
3...
Concept behind these four lines of tricky C code
... posted to the original form of the question, which mentioned only C++ and included a C++ header. The question's conversion to pure C was done by the community, without input from the original asker.
Formally speaking, it's impossible to reason about this program because it's ill-formed (i.e. it'...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...me key exist on B, its values from A and B will add together and
# get included in the final dictionary 'newdict'.
try:
addition = A[i] + B[i]
newdict[i] = addition
# If current key does not exist in dictionary B, it will give a KeyError,
# catch it and continue loop...
How can I programmatically check whether a keyboard is present in iOS app?
...fications. These notifications
contain information about the
keyboard, including its size, which
you can use for calculations that
involve moving views. Registering for
these notifications is the only way to
get some types of information about
the keyboard. The system delivers the
fo...
Undefined reference to vtable
...
In brief : the .cpp just wasn't included in the build. The error message is really misleading.
– Offirmo
Mar 4 '13 at 14:47
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Warning - Build path specifies execution environment J2SE-1.4
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How to handle exceptions in a list comprehensions?
...e exceptions).
Function calls are expression, and the function bodies can include all the statements you want, so delegating the evaluation of the exception-prone sub-expression to a function, as you've noticed, is one feasible workaround (others, when feasible, are checks on values that might prov...
How do I download a binary file over HTTP?
...people think that open-uri is dangerous because it monkeypatches all code, including library code, that uses open with a new ability that the calling code might not anticipate. You shouldn't be trusting user input passed to open anyway, but you need to be doubly careful now.
– ...