shmwrite ID,STRING,POS,SIZE 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, "IPC::SysV", and the "IPC::Shareable" module from CPAN. Portability issues: "shmread" in perlport and "shmwrite" in perlport.