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Annotation of researchv10dc/dist/man/v4/man2/signal.2, revision 1.1

1.1     ! root        1: .th SIGNAL II 8/5/73
        !             2: .sh NAME
        !             3: signal \*- catch or ignore signals
        !             4: .sh SYNOPSIS
        !             5: (signal = 48.)
        !             6: .br
        !             7: .ft B
        !             8: sys  signal; sig; value
        !             9: .s3
        !            10: signal(sig, func)
        !            11: .br
        !            12: int (*func)();
        !            13: .ft R
        !            14: .sh DESCRIPTION
        !            15: When the signal
        !            16: defined by
        !            17: .it sig
        !            18: is sent to the current process,
        !            19: it is to be treated according to
        !            20: .it value.
        !            21: The following is the list of signals:
        !            22: .s3
        !            23: .lp +10 5
        !            24: 1      hangup
        !            25: .lp +10 5
        !            26: 2      interrupt
        !            27: .lp +10 5
        !            28: 3*     quit
        !            29: .lp +10 5
        !            30: 4*     illegal instruction
        !            31: .lp +10 5
        !            32: 5*     trace trap
        !            33: .lp +10 5
        !            34: 6*     IOT instruction
        !            35: .lp +10 5
        !            36: 7*     EMT instruction
        !            37: .lp +10 5
        !            38: 8*     floating point exception
        !            39: .lp +10 5
        !            40: 9      kill (cannot be caught or ignored)
        !            41: .lp +10 5
        !            42: 10*    bus error
        !            43: .lp +10 5
        !            44: 11*    segmentation violation
        !            45: .lp +10 5
        !            46: 12*    bad argument to sys call
        !            47: .s3
        !            48: .i0
        !            49: If
        !            50: .it value
        !            51: is 0, the default system
        !            52: action applies to the signal.
        !            53: This is processes termination
        !            54: with or without a core dump.
        !            55: If
        !            56: .it value
        !            57: is odd, the signal is ignored.
        !            58: Any other even
        !            59: .it value
        !            60: specifies an address in the process
        !            61: where an interrupt is simulated.
        !            62: An RTI instruction will return from the
        !            63: interrupt.
        !            64: As a signal is caught,
        !            65: it is reset to 0.
        !            66: Thus if it is desired to
        !            67: catch every such signal,
        !            68: the catching routine must
        !            69: issue another
        !            70: .it signal
        !            71: call.
        !            72: .s3
        !            73: The starred signals in the list above
        !            74: cause core images if not caught and not ignored.
        !            75: In C,
        !            76: if
        !            77: .it func
        !            78: is 0 or 1, the action is as described above.
        !            79: If
        !            80: .it func
        !            81: is even, it is assumed to be the address
        !            82: of a function entry point.
        !            83: When the signal occurs,
        !            84: the function will be called.
        !            85: A return from the function will
        !            86: simulate the RTI.
        !            87: .s3
        !            88: After a
        !            89: .it fork,
        !            90: the child inherits
        !            91: all signals.
        !            92: The
        !            93: .it exec
        !            94: call resets all
        !            95: caught signals to default action.
        !            96: .sh "SEE ALSO"
        !            97: kill (I, II)
        !            98: .sh DIAGNOSTICS
        !            99: The error bit
        !           100: (c-bit)
        !           101: is set if the
        !           102: given signal is out of range.
        !           103: In C, a \*-1 indicates an error;
        !           104: 0 indicates success.

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