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From: dkeisen@leland.Stanford.EDU (Dave Eisen)
Newsgroups: comp.unix.internals
Subject: Re: sigblock,sigmask,sigsetmask ... for SYS V?
Message-ID: <1991Jun25.180617.20409@leland.Stanford.EDU>
Date: 25 Jun 91 18:06:17 GMT
References: <1991Jun21.225851.24990@uokmax.ecn.uoknor.edu> <srp.677620585@babar.mmwb.ucsf.edu> <1991Jun25.165700.17625@flood.com>
Organization: Sequoia Peripherals, Inc.
Lines: 7

In article <1991Jun25.165700.17625@flood.com> tom@flood.com (Tom Chatt) writes:
>Yes, but the important question is: can you emulate sigpause?
>The sigpause(2) call, which *atomically* waits for signals on
>a provided signal mask, is essential to properly avoid the
>critical races otherwise inherent in managing signals.

You can't. That's why BSD changed the AT&T signal handling so drastically.