=over =item shmread ID,VAR,POS,SIZE X<shmread> X<shmwrite> =item 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 L<perlipc/"SysV IPC">, C<IPC::SysV>, and the C<IPC::Shareable> module from CPAN. Portability issues: L<perlport/shmread> and L<perlport/shmwrite>. =back