Date: Wed, 4 Feb 1998 10:54:32 +0200 (SAT) From: Graham Wheeler <gram@cdsec.com> To: Michael.Schuster@utimaco.co.at (Michael Schuster) Cc: hackers@FreeBSD.ORG Subject: Re: Shared memory and signals Message-ID: <199802040854.KAA11487@cdsec.com> In-Reply-To: <34D8136F.CF845A68@utimaco.co.at> from "Michael Schuster" at Feb 4, 98 08:06:23 am
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> > Graham Wheeler <gram@cdsec.com> wrote: > > >I notice from looking at the kernel source > >that it appears as if an exit() effectively does a shmdt for each shared > >memory segment, but not a shmctl(IPC_RMID,..). > You probably wouldn't want to do that, since shmctl(IPC_RMID,..) really > removes the shm segment, and other processes trying to use it wouldn't > be very happy about that ... If the shmctl is done from the SIGCHLD handler, I know that there are no other processes still using the segment (as the only other process using the segment was the one that terminated and caused the SIGCHLD signal...) -- Dr Graham Wheeler E-mail: gram@cdsec.com Citadel Data Security Phone: +27(21)23-6065/6/7 Internet/Intranet Network Specialists Mobile: +27(83)-253-9864 Firewalls/Virtual Private Networks Fax: +27(21)24-3656 Data Security Products WWW: http://www.cdsec.com/
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