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Annotation of researchv10dc/dist/man/v4/manx/intr.2, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he 'INTR (II)'3/15/72'INTR (II)'
                      3: .ti 0
                      4: NAME           intr  --  set interrupt handling
                      5: .s3
                      6: .ti 0
                      7: SYNOPSIS       sys intr; arg  / intr = 27.
                      8: .s3
                      9: .nf
                     10: intr(label)
                     11: int *label;
                     12: .fi
                     13: .s3
                     14: .ti 0
                     15: DESCRIPTION    When arg___ is 0,
                     16: interrupts (ASCII DELETE) are ignored.
                     17: When arg___ is 1,
                     18: interrupts cause their normal result, that is, force an exit____.
                     19: When arg___ is a location within the program, control is
                     20: transferred to that location when an interrupt occurs.
                     21: .s3
                     22: After an interrupt is caught, it is possible to resume
                     23: execution by means of an rti___ instruction; however, great
                     24: care must be exercised, since
                     25: all I/O is terminated abruptly upon an interrupt.
                     26: In particular, reads of the typewriter tend to return
                     27: with 0 characters read, thus simulating an end of file.
                     28: .s3
                     29: From C, the interface is slightly different.
                     30: An argument of 0 or 1 has the
                     31: afore-mentioned effect of suppressing and forcing termination on
                     32: interrupts respectively.
                     33: An argument which is a label causes control
                     34: to be sent to the label when an interrupt occurs;
                     35: however the stack is set to have the same value
                     36: as it did when intr____ was called;
                     37: thus control returns to the complete execution environment
                     38: pertaining at the time of the call to intr____.
                     39: It is an error to call intr____ in a subroutine
                     40: and return from that subroutine, since
                     41: if an interrupt occurs
                     42: control will be returned
                     43: to a non-existent
                     44: environment.
                     45: .s3
                     46: It is not possible (with the C version of this call)
                     47: to resume execution after an interrupt.
                     48: .s3
                     49: .ti 0
                     50: SEE ALSO       quit(II)
                     51: .s3
                     52: .ti 0
                     53: DIAGNOSTICS    --
                     54: .s3
                     55: .ti 0
                     56: BUGS           --

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