What is csetjmp for?

Hello. I was looking though the standard library today, and I came across csetjmp, which I didn't know previously existed. After looking at it, it seems to do what the goto keyword does, which seemed strange because C has the goto keyword. So can someone tell me what its really for? Thankyou.
Yes, that's what I read.
setjmp and company are how you would implement an exception-like mechanism in C. There isn't really any reason to use it in C++.
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