106 lines
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106 lines
6.7 KiB
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<title>CALLSUBR command</title>
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<body id="callsubrc"><a name="callsubrc"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">CALLSUBR command</h1>
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<div><p>The <span class="cmdname">Call Subroutine (CALLSUBR)</span> command is used
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in a CL procedure for passing control to a subroutine defined within the same
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procedure.</p>
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<div class="section"><p>The <span class="cmdname">Call Subroutine (CALLSUBR)</span> command has
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two parameters: <span class="cmdname">Subroutine (SUBR)</span>, which contains the name
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of the subroutine to which control is to be transferred to, and <span class="cmdname">Return
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value (RTNVAL)</span>, which specifies the variable that will contain the
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return value from the called subroutine. See the following example:</p>
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<pre>CALLSUBR SUBR(mysubr) RTNVAL(&myrtnvar)</pre>
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<p>The subroutine <samp class="codeph">mysubr</samp> must be defined in the
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procedure by the Subroutine (SUBR) parameter of a <span class="cmdname">Subroutine (SUBR)</span> command.
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The variable '&myrtnvar' must be defined as TYPE(*INT) LEN(4), and will
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contain the value from the Return value (RTNVAL) parameter of either a <span class="cmdname">Return
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from Subroutine (RTNSUBR)</span> or the <span class="cmdname">End Subroutine (ENDSUBR)</span> command
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found in subroutine 'mysubr'. If no RTNVAL parameter is defined, the return
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value from the subroutine is ignored.</p>
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<p>The <span class="cmdname">Call Subroutine (CALLSUBR)</span> command
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may be placed anywhere within the procedure, including other subroutines,
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with the exception of a program-level <span class="cmdname">Monitor Message (MONMSG)</span> command.
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Each <span class="cmdname">Call Subroutine (CALLSUBR)</span> command, when run, places
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a return address onto the subroutine stack, and the size of the stack can
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be changed with the use of the Subroutine Stack (SUBRSTACK) parameter of the <span class="cmdname">Declare
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Process Options (DCLPRCOPT)</span> command. If a globally monitored message
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causes a GOTO command to be run, the subroutine stack will be reset by the
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next <span class="cmdname">Call Subroutine (CALLSUBR)</span> command that is run. See
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the following example:</p>
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<pre> PGM
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DCL VAR(&myrtnvar) TYPE(*INT) LEN(4)
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MONMSG MSGID(CPF0000) EXEC(GOTO CMDLBL(DUMP))
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:
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CALLSUBR SUBR(SUBR1) RTNVAL(&myrtnvar)
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:
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DUMP: DMPCLPGM
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CALLSUBR SUBR(SUBR2)
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:
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SUBR SUBR(SUBR1)
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:
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SUBR SUBR(SUBR1)
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:
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ENDSUBR RTNVAL(12)
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:
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SUBR SUBR(SUBR2)
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:
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ENDSUBR
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ENDPGM </pre>
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<p>In this example,
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the first <span class="cmdname">Call Subroutine (CALLSUBR)</span> command will pass
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control to the subroutine SUBR1, and the return value of <samp class="codeph">12</samp> will
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be placed into the variable <samp class="codeph">&myrtnvar</samp> when control returns.
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If a message is monitored by the <span class="cmdname">Monitor Message (MONMSG)</span> command,
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the <span class="cmdname">Goto (GOTO)</span> command will be run and control will branch
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to label DUMP, the CL procedure will be dumped by DMPCLPGM, and the next CALLSUBR
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to subroutine SUBR2 will reset the subroutine stack.</p>
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</div>
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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="contp.htm" title="You can use commands to change the flow of logic within your CL procedure.">Control processing within a CL procedure</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="subrc.htm" title="The Subroutine (SUBR) command is used in a CL procedure, along with the End Subroutine (ENDSUBR) command, to delimit the group of commands that define a subroutine.">SUBR command and Subroutines</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/dclprcopt.htm">Declare (DCLPRCOPT) command</a></div>
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<div><a href="../clfinder/finder.htm">CL command finder</a></div>
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<div><a href="../cl/callsubr.htm">Call Subroutine (CALLSUBR) command</a></div>
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</div>
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