Date: Mon, 2 Feb 1998 17:41:35 +0200 (SAT) From: Graham Wheeler <gram@cdsec.com> To: freebsd-hackers@FreeBSD.ORG Subject: Shared memory and signals Message-ID: <199802021541.RAA07701@cdsec.com>
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Hi all I was wondering whether it is safe to call shmdt and shmctl from within a signal handler. I have a program which forks off child processes which communicate their results back using a shared memory segment. I would like the parent to detach and release the shared memory from within the SIGCHLD signal handler, but I'm not sure whether this is safe. I would also like a SIGTERM signal handler to be able to free any shared memory segments before exiting. 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,..). Does anyone know if this is safe? Thanks in advance Graham -- 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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