Most of the time, on a classic, modern Linux system, what will be the value of the first file descriptor you will get after opening a new file with open (if open succeeds of course):1045623
Question
Most of the time, on a classic, modern Linux system, what will be the value of the first file descriptor you will get after opening a new file with open (if open succeeds of course):1045623
Solution
To determine the value of the first file descriptor after opening a new file with the open function on a classic, modern Linux system, we need to understand how file descriptors are assigned.
- By convention, the first three file descriptors (0, 1, and 2) are reserved for standard input, standard output, and standard error, respectively.
- When a new file is opened using the
openfunction, the operating system assigns the lowest available file descriptor to that file. - The file descriptors are assigned sequentially, starting from the first available number after the reserved ones.
Given that the value of the first file descriptor after opening a new file with open is 1045623, we can conclude that there are at least 1,045,620 file descriptors already in use on the system.
Please note that the actual value of the first file descriptor may vary depending on the system configuration and the number of file descriptors currently in use.
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why? #AlwaysAskWhyBecause this will be the third opened file descriptor for my processI don’t care I never ask why, just let me access the tasks!Because this will be the first opened file descriptor and in CS we start counting starting from 0Because this will be the second opened file descriptor for my processBecause most of the time, I will already have stdin (value 0), stdout (value 1) and stderr (value 2) opened when my program starts executing.Because this will be the first opened file descriptor and we start counting starting from 1
why? #AlwaysAskWhyBecause this will be the first opened file descriptor and we start counting starting from 1Because this will be the first opened file descriptor and in CS we start counting starting from 0Because most of the time, I will already have stdin (value 0), stdout (value 1) and stderr (value 2) opened when my program starts executing.I don’t care I never ask why, just let me access the tasks!Because this will be the second opened file descriptor for my processBecause this will be the third opened file descriptor for my process
State what os.close(f) does?Select one:returns an integer telling how close the file pointer is to the end of filecloses the file descriptor fterminates the process fterminates the process f if f is not responding
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