What is the difference between open and opendir calls on UNIX?

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If the open file uses the open system call, why is there another system call to open files directory (opendir), if a directory is a file type? It wasn’t supposed to be a call just for all kinds of files?

c api filing-cabinet directory unix

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In thesis could but you would have to filter what is directory or not, could err or not pay attention to all the details. A opendir treats a directory in a more specific way. It is essentially a facilitator in relation to open for a specific situation.

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As far as I know open opens all file types, except directories.

Already opendir returns DIR* from the open directory that is passed to readdir() to read its contents.

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