What is the written-out word for O_EXCL

问题

I was writing a safe enum class for the different file flags listed in open(3), when I noticed that I couldn't find the written-out word for O_EXCL.

enum class Flags {
    readOnly, // O_RDONLY
    truncate, // O_TRUNC
    ?         // O_EXCL
};

Two possible meanings come into my mind:

• OPEN_EXCLUSIVE
• OPEN_EXISTS_CLOSE

But I can't find any resources on the intended meaning.

回答1:

Exclusive would be a correct word here, since the flag is exclusive to the O_CREAT flag and makes the function fail if the file exists. (If the O_CREAT flag is not set the behavior is undefined.)

来源：https://stackoverflow.com/questions/48388212/what-is-the-written-out-word-for-o-excl