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Full Discussion: jump in a .KSH batch
Operating Systems AIX jump in a .KSH batch Post 302253970 by bakunin on Monday 3rd of November 2008 08:38:47 AM
Old 11-03-2008
Quote:
Originally Posted by enge
can i set the value of the run variabile via cobol program?
The "$?" is a special variable called "Error code" or "Error level". It is an (unsigned short) integer value. A value of "0" (which also happens to be a logical "TRUE" in "if"-conditions) is considered to mean "normally finished program", every code other than that means one of several erroneous conditions.

Try it yourself:

Code:
cat /some/existing/file >/dev/null ; echo $?        # will print "0"
cat /some/non-existing/file >/dev/null ; echo $?    # will print "1"

The output of "cat" is directed to /dev/null (the "black hole" of the OS) so you won't notice its operation. It still gives back an error code to the OS when it terminates and this is what you see with "echo $?". The "1" in the second case is because "cat" cannot find the file you are asking it to print.

Having said this: Yes, you can use this mechanism to pass messages to your calling program. As COBOL is a compiled language you will have to use the exit()-systemcall, which will take an (unsigned integer) value, which will be passed as error level.

You can NOT pass arbitrary messages (like text, etc.) via this mechanism, so the functionality is quite limited. If you want to pass longer output to other programs you should not use this mechanism anyway, but other means like writing to <stdout>. If you write to <stdout> you can use the pipeline construct to pass input to another program, which will read it from its <stdin>.

Code:
program1 | program2

Means simply that "program1" creates some output. This output could go into a file, a device, whatever. "program2" gets its input from <stdin>. Normally this will be you typing away, it could also be a file, a device, etc.. In this special case the OS is connecting <stdout> of "program1" with <stdin> of "program2" this way establishing a (one-way) communication. So in fact the pipeline can be thought of a shortcut to:

Code:
program1 > file
program2 < file

just without the intermediary file in between. Notice, btw., that the error code of a pipeline is always the error code of the last command. If in our example program1 returns "0" and program2 returns "1" then "$?" would yield "1". In the second example with the intermediary file you could separately get the the error codes of program1 and program2, but i get carried away....

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

qsig

qsig(1B)								PBS								  qsig(1B)

NAME

       qsig - signal pbs batch job

SYNOPSIS

       qsig [-s signal] job_identifier ...

DESCRIPTION

       The qsig command requests that a signal be sent to executing batch jobs.  The signal is sent to the session leader of the job.

       If the -s option is not specified, `SIGTERM' is sent.  The request to signal a batch job will be rejected if:

       -      The user is not authorized to signal the job.

       -      The job is not in the running state.

       -      The requested signal is not supported by the system upon which the job is executing.

       The qsig command sends a Signal Job batch request to the server which owns the job.

OPTIONS

       -s signal      Declares which signal is sent to the job.

		      The signal argument is either a signal name, e.g.  SIGKILL, the signal name without the SIG prefix, e.g. KILL, or a unsigned
		      signal number, e.g. 9.  The signal name SIGNULL is allowed; the server will send the signal 0 to the job which will have	no
		      effect  on  the  job, but will cause an obituary to be sent if the job is no longer executing.  Not all signal names will be
		      recognized by qsig. If it doesn't recognize the signal name, try issuing the signal number instead.

		      Two special signal names, "suspend" and "resume", are used to suspend and resume jobs.  Cray systems use	the  Cray-specific
		      suspend()/resume() calls.

		      On  non-Cray system, suspend causes a SIGTSTP to be sent to all processes in job's top task, wait 5 seconds, and then send a
		      SIGSTOP to all processes in all tasks on all nodes in the job.  This differs from TORQUE 2.0.0 which did not have the  abil-
		      ity to propogate signals to sister nodes.  Resume sends a SIGCONT to all processes in all tasks on all nodes.

		      When  suspended,	a  job continues to occupy system resources but is not executing and is not charged for walltime.  The job
		      will be listed in the "S" state.	Manager or operator privilege is required to suspend or resume a job.

		      Note that interactive jobs may not resume properly because the top-level shell will background the suspended child process.

OPERANDS

       The qsig command accepts one or more job_identifier operands of the form: sequence_number[.server_name][@server]

STANDARD ERROR

       The qsig command will write a diagnostic messages to standard error for each error occurrence.

EXIT STATUS

       Upon successful processing of all the operands presented to the qsig command, the exit status will be a value of zero.

       If the qsig command fails to process any operand, the command exits with a value greater than zero.

SEE ALSO

       qsub(1B), pbs_sigjob(3B), pbs_resources_*(7B) where * is system type, and the PBS ERS.

Local																	  qsig(1B)
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