Reads or writes the System V shared memory segment ID starting at position POS for size SIZE by attaching to it, copying in/out, and detaching from it. When reading, VAR must be a variable that will hold the data read. When writing, if STRING is too long, only SIZE bytes are used; if STRING is too short, nulls are written to fill out SIZE bytes. Return true if successful, false on error. shmread taints the variable. See also "SysV IPC" in perlipc and the documentation for IPC::SysV and the IPC::Shareable module from CPAN.
Portability issues: "shmread" in perlport and "shmwrite" in perlport.
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