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What is the difference between user and kernel modes in operating systems?
...ttp://wiki.osdev.org/Global_Descriptor_Table
the segment registers CS, DS, etc., which point to the index of an entry in the GDT.
For example, CS = 0 means the first entry of the GDT is currently active for the executing code.
What can each ring do?
The CPU chip is physically built so that:
...
if arguments is equal to this string, define a variable like this string
... r)
SERVER=$OPTARG
;;
p)
PASSWD=$OPTARG
;;
v)
VERBOSE=1
;;
?)
usage
exit
;;
esac
done
if [[ -z $TEST ]] || [[ -z $SERVER ]] || [[ -z $PASSWD ]]
then...
What is the difference between the kernel space and the user space?
...r processes have to use the predefined system calls i.e. open, read, write etc. Also, the C library functions like printf call the system call write in turn.
The system calls act as an interface between the user processes and the kernel processes. The access rights are placed on the kernel space i...
Is PHP compiled or interpreted?
... performance penalty as PHP recompiles my source code for every request?", etc.)
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node.js remove file
...o check files can be deleted or not, Use fs.access instead
fs.access('/etc/passwd', fs.constants.R_OK | fs.constants.W_OK, (err) => {
console.log(err ? 'no access!' : 'can read/write');
});
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How do cache lines work?
... a rule of thumb, if the processor can't forecast a memory access (and prefetch it), the retrieval process can take ~90 nanoseconds, or ~250 clock cycles (from the CPU knowing the address to the CPU receiving data).
By contrast, a hit in L1 cache has a load-use latency of 3 or 4 cycles, and a store...
How to capture no file for fs.readFileSync()?
...tead pass the error in the callback and handle it there: fs.readFile('/etc/passwd', (err, data) => { if (err) throw err; console.log(data); }); from: nodejs.org/dist/latest-v12.x/docs/api/…
– K.H. B
Mar 30 at 16:44
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How to determine whether a given Linux is 32 bit or 64 bit?
...et your specific machine hardware name run
uname -m
You can also call
getconf LONG_BIT
which returns either 32 or 64
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How to send a correct authorization header for basic authentication
...
You can include the user and password as part of the URL:
http://user:passwd@www.server.com/index.html
see this URL, for more
HTTP Basic Authentication credentials passed in URL and encryption
of course, you'll need the username password, it's not 'Basic hashstring.
hope this helps...
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Having Django serve downloadable files
...t the user can potentially download any file (ie. what if you pass "f=/etc/passwd" ?) There are a lot of things that help prevent this (user permissions, etc), but just be aware of this obvious but common security risk. It's basically just a subset of validating input: If you pass in a filename to...