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Perl in a Nutshell

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Function Reference
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shmread id, var, pos, size

Reads from the shared memory segment id starting at position pos for size size (by attaching to it, copying out, and detaching from it). var must be a variable that will hold the data read. The function returns true if successful, or false if there is an error. On error, it puts the error code into $!. This function is available only on machines supporting System V IPC.

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