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From: allbery@NCoast.ORG (Brandon S. Allbery KB8JRR/KT)
Newsgroups: comp.sources.d,alt.sources.d
Subject: Re: missing sigsetmask() in bash-1.05 under SCO Xenix
Message-ID: <1990Aug12.154458.6113@NCoast.ORG>
Date: 12 Aug 90 15:44:58 GMT
References: <85@siva.UUCP>
Reply-To: allbery@ncoast.ORG (Brandon S. Allbery KB8JRR/KT)
Followup-To: comp.sources.d
Distribution: usa
Organization: North Coast Public Access *NIX, Cleveland, OH
Lines: 41

As quoted from <85@siva.UUCP> by mark@siva.UUCP (Mark Marsh):
+---------------
| I am missing the sigsetmask() function at link time when compiling
| bash-1.05 under SCO Xenix 2.3 with development version 2.3.1b, and
| alternately using gcc-1.37.1.
+---------------

sigsetmask() is part of the BSD signal mechanism; it can be loosely
approximated by calling sighold() on a signal when its bit is 1 and sigrelse()
if it is 0.  (The real sigsetmask() returns the original mask, but there's no
good way to emulate this that I know of, that won't cause problems.)

The following is a rough, UNTESTED (i.e. use at your own risk) quick
approximation to sigsetmask().

I should note that you probably configured bash wrong; I didn't see any calls
to sigsetmask() outside the job-control code, which won't work under SCO Xenix
or SCO Unix (which has job control, but it's of the POSIX variety so bash
won't work.)  I might have missed something, though.

int
sigsetmask(mask)
    int mask;
{
    int sig;

    for (sig = 1; sig < NSIG; sig++)
    {
	if ((mask >>= 1) & 1)
	    sighold(sig);
	else
	    sigrelse(sig);
    }
    return 0;		/* should return the old mask */
}

++Brandon
-- 
Me: Brandon S. Allbery			    VHF: KB8JRR/KT on 220 (soon others)
Internet: allbery@NCoast.ORG		    Delphi: ALLBERY
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