Have Unix-domain datagrams been fixed yet?
Stephen Hemminger
steveh at hammer.UUCP
Tue Sep 24 01:44:16 AEST 1985
In article <2345 at sdcrdcf.UUCP> lwall at sdcrdcf.UUCP (Larry Wall) writes:
>I think we've been running into the old problem with Unix-domain datagrams
>crashing the system. We'd really like to use them in an application here.
>We're getting m_getclr panics and I wonder if anybody's fixed this yet.
>Could some kind soul tell me what the sequence of events is, and whether
>a fix is possible? Is it fixed in 4.3?
Yes, yes, yes. fixes follow.
>Thanks.
>Larry Wall
>{allegra,burdvax,cbosgd,hplabs,ihnp4,sdcsvax}!sdcrdcf!lwall
Caveat:Your line numbers will vary.
*** sys/uipc_usrreq.c Mon Sep 23 08:40:43 1985
--- sys/uipc_usrreq.c.old Mon Sep 23 08:40:53 1985
***************
*** 168,183
if (error)
break;
}
! /*
! * Put data address and rights on receiver's queue.
! * There's no record of source socket's
! * name, so send null name for the moment.
! *
! * If no space (returns 0), then m will be
! * freed later.
! */
! if (sbappendaddr(&so2->so_rcv, &sun_noname,
! m, rights) != 0) {
sbwakeup(&so2->so_rcv);
m = 0;
}
--- 164,176 -----
if (error)
break;
}
! if (sbspace(&so2->so_rcv) > 0) {
! /*
! * There's no record of source socket's
! * name, so send null name for the moment.
! */
! (void) sbappendaddr(&so2->so_rcv,
! &sun_noname, m, rights);
sbwakeup(&so2->so_rcv);
m = 0;
}
---
P.s: If you want the changes to make Out of Band Data work in
unix domain (this isn't in 4.3). send me a note.
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