Return to signal.2 CVS log

Up to [Research Unix] / researchv10dc / dist / man / v4 / man2

Annotation of researchv10dc/dist/man/v4/man2/signal.2, revision 1.1.1.1

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.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.