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What is the reason for performing a double fork when creating a daemon?
... by setsid(). So, the first forked process becomes a session leader after calling setsid() and then we fork again so that the final, double-forked process is no longer a session leader. Other than the requirement of setsid() to be a session leader, you are spot on.
– dbmikus
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Why is XOR the default way to combine hashes?
...paper that explains that combining hashes securely where each function is called only once is not possible without outputting less bits than the sum of number of bits in each hash value. This suggest that this answer is not correct.
– Tamás Szelei
Jul 23 '12 a...
What is the difference between CMD and ENTRYPOINT in a Dockerfile?
...ypoint. i.e., the actual thing that gets executed is /bin/sh -c bash. This allowed Docker to implement RUN quickly by relying on the shell's parser.
Later on, people asked to be able to customize this, so ENTRYPOINT and --entrypoint were introduced.
Everything after ubuntu in the example above is ...
How to use sed to replace only the first occurrence in a file?
...lude directive before any existing #includes. For this sort of task, I normally use a small bash script with sed to re-write the file.
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Type Checking: typeof, GetType, or is?
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All are different.
typeof takes a type name (which you specify at compile time).
GetType gets the runtime type of an instance.
is returns true if an instance is in the inheritance tree.
Example
class Animal { }
class Do...
How do I set a background-color for the width of text, not the width of the entire element, using CS
...enate <h1> and <h2> to be in same line.... when they are originally in next lines.
– ihightower
Dec 19 '16 at 15:37
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How to find the lowest common ancestor of two nodes in any binary tree?
...west common ancestor problem page on Wikipedia. (Credit to Jason for originally posting this link)
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pandas: How do I split text in a column into multiple rows?
...nswered Jun 14 '13 at 20:44
Dan AllanDan Allan
27.4k66 gold badges6060 silver badges6060 bronze badges
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What's the difference between a Future and a Promise?
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According to this discussion, Promise has finally been called CompletableFuture for inclusion in Java 8, and its javadoc explains:
A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent fu...
Difference between 'struct' and 'typedef struct' in C++?
...struct Foo x;
Any time you want to refer to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add a typedef:
struct Foo { ... };
typedef struct Foo Foo;
Now struct Foo (in the tag namespace) and just plain Foo (in the ordinary identifier namespace) both refe...