74 lines
5.5 KiB
HTML
74 lines
5.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<meta name="DC.Title" content="Open and close files in a CL procedure" />
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<meta name="abstract" content="When you use CL support, the file referred to is implicitly opened when you do your first send, receive, or send/receive operation. An opened display file remains open until the procedure or OPM program in which it was opened returns or transfers control. An opened database file is closed when end of file is reached, or when the procedure or OPM program in which it was opened returns or transfers control. Once a database file has been closed, it cannot be opened again during the same call of the procedure or OPM program." />
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<meta name="description" content="When you use CL support, the file referred to is implicitly opened when you do your first send, receive, or send/receive operation. An opened display file remains open until the procedure or OPM program in which it was opened returns or transfers control. An opened database file is closed when end of file is reached, or when the procedure or OPM program in which it was opened returns or transfers control. Once a database file has been closed, it cannot be opened again during the same call of the procedure or OPM program." />
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<meta name="DC.subject" content="file, display, opening, closing, declaring, database" />
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<meta name="keywords" content="file, display, opening, closing, declaring, database" />
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<title>Open and close files in a CL procedure</title>
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</head>
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<body id="ocfil"><a name="ocfil"><!-- --></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">Open and close files in a CL procedure</h1>
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<div><p>When you use CL support, the file referred to is implicitly opened
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when you do your first send, receive, or send/receive operation. An opened
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display file remains open until the procedure or OPM program in which it was
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opened returns or transfers control. An opened database file is closed when
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end of file is reached, or when the procedure or OPM program in which it was
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opened returns or transfers control. Once a database file has been closed,
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it cannot be opened again during the same call of the procedure or OPM program.</p>
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<div class="section"> <p>When a database file opens, the first member in the file will
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open, unless you previously used an <span class="cmdname">Override Database File (OVRDBF</span>)
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command to specify a different member (MBR parameter). If a procedure or OPM
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program ends because of an error, the files close. A file remains open until
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the procedure or OPM program in which that file was opened ends. Because of
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this, you have an easy way to share open data paths between running procedures
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and programs. You can open a file in one procedure or program. Then the file
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can share its open data path with another procedure or program under either
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of the following conditions:</p>
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<ul><li>The file was created with or has been changed to have the SHARE(*YES)
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attribute.</li>
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<li>An override for that file by specifying SHARE(*YES) is in effect.</li>
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</ul>
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<p>You can share files in this way between any two procedures or programs.
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Use online help for a detailed description of the function available when
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the system shares open data paths. Additionally, IBM<sup>®</sup> provides a description of the SHARE
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parameter on the <span class="cmdname">Create Display File (CRTDSPF)</span>, <span class="cmdname">Create
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Physical File (CRTPF)</span>, and <span class="cmdname">Create Logical File (CRTLF)</span> commands
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online. A display file opened in a CL procedure or OPM program always opens
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for both input and output. A database file opened in a CL procedure or OPM
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program opens for input only.</p>
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<p>Do not specify LVL(*CALLER) on the <span class="cmdname">Reclaim
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Resources (RCLRSC)</span> command in CL procedures and programs using files.
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If you specified LVL(*CALLER), all files opened by the procedure or OPM program
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would be immediately closed, and any attempt to access the file would end
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abnormally.</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="wfile.htm" title="Two types of files are supported in CL procedures and programs: display files and database files.">Work with files in CL procedures</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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