pause(3) vs. sigpause(2)

[Chris Torek]

In article <722 at inews.intel.com> bhoughto at cmdnfs.intel.com
(Blair P. Houghton) writes:
>... it seems `pause()' waits for
>whatever signals are currently unblocked, and `sigpause(0)'
>unblocks everything (only for the duration of the wait) and
>then waits.  (sigpause(n) would use n as a signal mask).

Correct.  As the manual page states, sigpause(mask) atomically
sets the signal mask to `mask' and waits for a signal, then restores
the signal mask to whatever it was before.  pause() is effectively
equivalent to sigpause(sigblock((sigmask_t)0)).

(Use sigblock(0L) in old systems, or sigblock(0) if you do not care
about 2.10BSD.)
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 405 2750)
Domain:	chris at cs.umd.edu	Path:	uunet!mimsy!chris