Signal Handling--ref

For portability,use only the functions described in this section to initialize,change,and retrieve information fromsigset_tobjects--don't try to manipulate them directly.

sigemptysetand then add specified signals individually. Or you can specify it to be full withsigfillsetand then delete specified signals individually.

sigset_tobject might include some other information (like a version field) that needs to be initialized as well. (In addition,it's not wise to put into your program an assumption that the system has no signals aside from the ones you know about.)

intsigemptyset(sigset_t *set)

This function initializes the signal setsetto exclude all of the defined signals. It always returns0.

intsigfillset(sigset_t *set)

This function initializes the signal setsetto include all of the defined signals. Again,the return value is0.

intsigaddset(sigset_t *set,intsignum)

This function adds the signalsignumto the signal setset. Allsigaddsetdoes is modifyset; it does not block or unblock any signals.

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