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How can I get the maximum shared memory segment size in program?

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How can I get the maximum shared memory segment size in program?

Subject: How can I get the maximum shared memory segment size in program?
From: bady yu <email@hidden>
Date: Sat, 29 Dec 2007 13:34:37 +0800

I can use "sysctl kern.sysv.shmmax" or "ipcs -M" to get the integer(4194304). But they are both command line tools. It is not convenient to call it inside the problem.

I also have tried to use the sysctlbyname system call: sysctlbyname("kern.sysv.shmmax", &shmmax, &len, NULL, NULL). Although this call return 0, the shmmax variable does not hold the correct value.

By the way, my system is Leopard.

Can anybody tell me an appropriate way?  Thank you in advance!
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