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Eloquence may use the USR1 signal to communicate with either
HP-UX processes or another Eloquence process.
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ON SIGNAL
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Branches to a specified program sequence when USR1 signal is caught
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OFF SIGNAL
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Cancels previous ON SIGNAL
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SEND SIGNAL #
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Send USR1 signal to specified taskid
The ON SIGNAL Statement
The ON SIGNAL statement sets up branching condition which will occur
if a USR1 signal is caught.
GOTO line id
ON SIGNAL GOSUB line id
CALL subprogram name
The branch occurs immediately after the current program line is executed.
Here is an example sequence which checks for the USR1 signal and branches
to a routine to output some debug information.
100 ON SIGNAL GOSUB Signal
110 ON HALT GOTO Stop
120 LOOP
130 I=I+1
140 END LOOP
150 Stop:!
160 DISP "I=";I
170 END
180 Signal:!
190 DISP "I=";I
200 RETURN
The ON SIGNAL condition is cancelled after SCRATCH, STOP, END or RUN.
The OFF SIGNAL Statement
To cancel any previous OFF SIGNAL condition, use the OFF SIGNAL statement.
OFF SIGNAL
The SEND SIGNAL # Statement
The SEND SIGNAL # statement will send a USR1 signal to the specified taskid.
SEND SIGNAL #taskid
It's also possible to send USR1 signal from shell (or using the
COMMAND statement) but this way you don't you have to know the
process id of the destination process.
NOTE: HP-UX protection scheme prohibits sending signals to a
process owned by another user.
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