semop man page explanation

Hello all,

Could someone explain what does this mean:
· The calling process catches a signal: the value of semncnt is decre‐
mented and semop() fails, with errno set to EINTR.

It is part of the man semop page. I don't understand what they mean by 'signal'. Are they talking about V(S) that is equivalent to call semop(...) on the semaphore with sem_op=1 ?

Thank you.
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