Signal Handling--ref

The return value is0on success and-1on failure. The followingerrnoerror condition is defined for this function:

EINVAL

Thesignumargument doesn't specify a valid signal.

intsigdelset(sigset_t *set,intsignum)

This function removes the signalsignumfrom the signal setset. Allsigdelsetdoes is modifyset; it does not block or unblock any signals. The return value and error conditions are the same as forsigaddset.

intsigismember(const sigset_t *set,intsignum)

Thesigismemberfunction tests whether the signalsignumis a member of the signal setset. It returns1if the signal is in the set,0if not,and-1if there is an error.

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