194 lines
5.9 KiB
HTML
194 lines
5.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>QlgSem_open()--Open Named Semaphore (using NLS-enabled path
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name)</title>
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<!-- Begin Header Records -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!-- IPCSOU SCR A converted by B2H R4.1 (346) (CMS) by V2CDIJAB at -->
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<!-- RCHVMW2 on 15 Sep 2000 at 11:27:55 -->
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<!-- This file has undergone html cleanup on 05/01/02 by JET -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!--End Header Records --><!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>QlgSem_open()--Open Named Semaphore (using NLS-enabled path name)</h2>
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<div class="box" style="width: 80%;">
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<br>
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Syntax
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<pre>
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#include <semaphore.h>
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#include <qlg.h>
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sem_t * QlgSem_open(const Qlg_Path_Name_T *<em>name</em>,
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int <em>oflag</em>, ...);
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</pre>
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<br>
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Service Program Name: QP0ZPSEM<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>QlgSem_open()</strong> function, like the <strong>
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sem_open()</strong> function, opens a named semaphore and returns a semaphore
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pointer that may be used on subsequent calls to <strong>sem_post()</strong>,
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<strong>sem_post_np()</strong>, <strong>sem_wait()</strong>, <strong>
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sem_wait_np()</strong>, <strong>sem_trywait()</strong>, <strong>
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sem_getvalue()</strong>, and <strong>sem_close()</strong>. The <strong>
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QlgSem_open()</strong> function takes a pointer to a Qlg_Path_Name_T structure,
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while the <strong>sem_open()</strong> function takes a pointer to a character
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string that is in the CCSID of the job.</p>
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<p>Limited information on the <em>name</em> parameter is provided in this API.
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For additional information on the <em>name</em> parameter and a discussion of
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other parameters, authorities required, return values, and related information,
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see <a href="ipcsemo.htm">sem_open()</a>--Open Named Semaphore.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>name</strong></dt>
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<dd>(Input) A pointer to a Qlg_Path_Name_T structure that contains a path name
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or a pointer to a path name of the semaphore to be opened. For more information
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on the Qlg_Path_Name_T structure, see <a href="../apiref/pns.htm">Path name
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format</a>.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>QlgSem_open()</strong> is not successful, <em>errno</em> usually
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indicates the following error or one of the errors identified in <a href=
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"ipcsemo.htm#ecsemo">sem_open()</a>--Open Named Semaphore.</p>
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<dl compact>
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<dt><em>[ECONVERT]</em></dt>
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<dd>A conversion error for the parameter <em>name</em>.</dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>qlg.h</strong>> file (see <a href="unix13.htm">Header
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Files for UNIX-Type Functions</a>)<br>
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<br>
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</li>
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<li><a href="ipcsemo.htm">sem_open()</a>--Open Named Semaphore<br>
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<br>
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</li>
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<li><a href="ipcsemonu.htm">QlgSem_open_np()</a>--Open Named Semaphore with
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Maximum Value (using NLS-enabled path name)<br>
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<br>
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</li>
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<li><a href="ipcsemunu.htm">QlgSem_unlink()</a>--Unlink Named Semaphore (using
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NLS-enabled path name)</li>
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</ul>
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<p><strong>Note:</strong> All of the related information for <strong>
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sem_open()</strong> applies to <strong>QlgSem_open()</strong>. See Related
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Information in <a href="ipcsemo.htm#risemo">sem_open()</a>.</p>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example opens the named semaphore "/mysemaphore" and creates
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the semaphore with an initial value of 10 if it does not already exist. If the
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semaphore is created, the permissions are set such that only the current user
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has access to the semaphore.</p>
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<pre>
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#include <semaphore.h>
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#include <qlg.h>
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main() {
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sem_t * my_semaphore;
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int rc;
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#define mypath "/mysemaphore"
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const char US_const[3]= "US";
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const char Language_const[4]="ENU";
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const char Path_Name_Del_const[2]= "/";
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typedef struct pnstruct
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{
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Qlg_Path_Name_T qlg_struct;
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char[100] pn; /* This size must be >= the path */
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/* name length or be a pointer */
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/* to the path name. */
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};
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struct pnstruct path;
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/***************************************************************/
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/* Initialize Qlg_Path_Name_T parameters */
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/***************************************************************/
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memset((void*)path name, 0x00, sizeof(struct pnstruct));
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path.qlg_struct.CCSID = 37;
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memcpy(path.qlg_struct.Country_ID,US_const,2);
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memcpy(path.qlg_struct.Language_ID,Language_const,3);
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path.qlg_struct.Path_Type = QLG_CHAR_SINGLE;
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path.qlg_struct.Path_Length = sizeof(mypath)-1;
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memcpy(path.qlg_struct.Path_Name_Delimiter,Path_Name_Del_const,1);
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memcpy(path.pn,mypath,sizeof(mypath));
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my_semaphore = QlgSem_open((Qlg_Path_Name_T *)path name,
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O_CREAT, S_IRUSR | S_IWUSR, 10);
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}
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</pre>
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<br>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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