longjmp() from signal handler

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From the man page for longjmp:

POSIX does not specify whether
longjmp() will restore the signal
context. If you want to save and
restore signal masks, use siglongjmp()

Your second question: Yes, the function will return -2 because longjmp() will cause it to go to the setjmp(buffer) part, but the timing will have to be very precise.

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