98 lines
7.2 KiB
HTML
98 lines
7.2 KiB
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<meta name="DC.Title" content="Process overrides: General principles" />
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<meta name="abstract" content="The server processes overrides according to some general principles." />
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<meta name="DC.subject" content="call level, effect on override processing, processing, overrides, call level effects, override, when specified, QCMDEXC program, order of application, securing, protecting override, SECURE parameter, *YES value, override protection, application, order, several overrides to single file" />
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<title>Process overrides: General principles</title>
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<body id="rbal3ovrgp"><a name="rbal3ovrgp"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Process overrides: General principles</h1>
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<div><p>The server processes overrides according to some general principles.</p>
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<ul><li>Overrides applied include any that are in effect at the time a file is
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opened by an application program, when a program that opens a file is compiled,
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or when certain server commands are used. (See <a href="rbal3ovrfa.htm#rbal3ovrfa">Override file attributes</a>, <a href="rbal3aowcp.htm#rbal3aowcp">Apply overrides when compiling a program</a>, and <a href="rbal3eoscd.htm#rbal3eoscd">Effect of overrides on some commands</a>).
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Thus, any overrides that are to be applied must be specified either before
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the file is opened by a program or before a program that opens the file is
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compiled. It is not necessary that overrides must be supplied for every file
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that is used in a program. Any file name for which no override is supplied
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is used as the actual file name.</li>
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<li>Override commands that are scoped to the job level remain in effect until
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they are replaced, deleted, or until the job in which they are specified ends.
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For more information about deleting overrides, see <a href="rbal3deover.htm#rbal3deover">Delete overrides</a>.</li>
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<li>There can be only one active override for a file at each level (job level,
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activation group level, or call level). If more than one override for the
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same file exists at the same level, the most recent one is active. <p>For
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an example of how the server processes overrides when more than one override
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for the same file exists at the same level, see <a href="rbal3ovrsf2.htm">Overrides to the same file at the same call level: scenario</a>.</p>
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</li>
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<li>Override commands that are scoped to the job level apply to all programs
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that are running in the job regardless of the call level or activation
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group in which the overrides are specified.</li>
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<li>Override commands that are scoped to an activation group level apply to
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all programs that are running in the activation group regardless of the call
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level in which the overrides are specified.</li>
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<li>An override command (scoped to the call level) that is entered interactively
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exists at the call level for the caller of that command processor. For example,
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an override (scoped to the call level) that is entered on the command entry
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display cannot be deleted or replaced from a command processor that is called
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from the command entry display.</li>
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<li>The call level of an override (scoped to the call level) that is coded
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in a CL program is the call level of the CL program.</li>
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<li>An override (scoped to the call level) outside a program in a batch job
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takes the call level of the batch job command processor.</li>
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<li>If an override command (scoped to the call level) is run using a call
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to the QCMDEXC program, the override takes the call level of the program that
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called the QCMDEXC program. For an example, see <a href="rbal3clovr.htm#rbal3clovr">CL program overrides</a>.</li>
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<li>Exits (<a href="../cl/endpgm.htm">ENDPGM</a>, <a href="../cl/return.htm">RETURN</a>, or abnormal
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exits) from a call operation delete overrides scoped to that call level. However,
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they do not delete overrides that are issued in that call level when they
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are scoped to the activation group level or the job level. <p>For an example,
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see <a href="rbal3exits.htm#rbal3exits">Effect of exits on overrides: scenario</a>.</p>
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</li>
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<li>The <a href="../cl/tfrctl.htm">TFRCTL</a> command
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causes one program to be replaced by another program at the same call level.
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The program, to which control is transferred, runs at the same call level
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as the program that contained the TFRCTL command. An override command in a
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program that transfers control to another program is not deleted during the
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transfer of control. <p>For an example, see <a href="rbal3aosin.htm#rbal3aosin">Effect of TFRCTL on overrides: Scenario</a>.</p>
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</li>
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<li>Several overrides (possibly one per call level, one at the activation
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group level, and one at the job level) to a single file are allowed. They
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are processed according to the priorities in <a href="rbal3prior.htm#rbal3prior">Process priority of overrides</a>. <p>For
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an example of processing overrides, see <a href="rbal3ile.htm#rbal3ile">How the server processes overrides: scenario</a>.</p>
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</li>
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<li>You can protect an override from being overridden by overrides at lower
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call levels, the activation group level, and the job level; specify SECURE(*YES)
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on the override. For an example, see <a href="rbal3secrf.htm#rbal3secrf">Secure files against overrides</a>.</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal3call.htm" title="In the Integrated Language Environment, overrides can be scoped to the call level, the activation-group level (the default), and the job level.">How the server processes overrides</a></div>
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</div>
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</div>
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</body>
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</html>
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