V1/man/man2/intr.2

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        11/3/71                                                SYS INTR (II)


NAME              intr -- set interrupt handling

SYNOPSIS          sys        intr; arg        / intr = 27.

DESCRIPTION       When arg is 0, interrupts (ASCII DELETE) are ignored. When
                  arg is 1, interrupts cause their normal result, that is,
                  force an exit. When arg is a location within the program,
                  control is transferred to that location when an interrupt
                  occurs.

                  After an interrupt is caught, it is possible to resume
                  execution by means of an rti instruction; however, great
                  care must be exercised, since all I/O is terminated
                  abruptly upon an interrupt. In particular, reads of the
                  typewriter tend to return with 0 characters read, thus
                  simulating an end of file.

FILES

SEE ALSO          quit

DIAGNOSTICS

BUGS              It should be easier to resume after an interrupt, but I
                  don't know how to make it work.

OWNER             ken, dmr