Signal Handling--ref

specifies a mask that includes all the job-control stop signals.

intsigblock(intmask)

This function is equivalent tosigprocmask(see section) with ahowargument ofSIG_BLOCK: it adds the signals specified bymaskto the calling process's set of blocked signals. The return value is the previous set of blocked signals.

intsigsetmask(intmask)

This function equivalent tosigprocmask(see section) with ahowargument ofSIG_SETMASK: it sets the calling process's signal mask tomask. The return value is the previous set of blocked signals.

intsigpause(intmask)

This function is the equivalent ofsigsuspend(see section): it sets the calling process's signal mask tomask,and waits for a signal to arrive. On return the previous set of blocked signals is restored.

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