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| <div class="subTitle"><span class="moduleLabelInType">Module</span> <a href="../../../../../../module-summary.html">openj9.dtfj</a></div> |
| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.ibm.dtfj.corereaders.zos.util</a></div> |
| <h2 title="Class Clib" class="title">Class Clib</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>com.ibm.dtfj.corereaders.zos.util.Clib</li> |
| </ul> |
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| <hr> |
| <pre>public class <span class="typeNameLabel">Clib</span> |
| extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a></pre> |
| <div class="block">This class provides a low level interface to some of the z/OS C library. This approach was |
| inspired by the |
| <a href="https://www.eclipse.org/articles/Article-SWT-Design-1/SWT-Design-1.html">SWT design</a> |
| in that we have a one-to-one mapping between JNI calls and C library calls: no extra work is |
| done in the native functions. This is much easier to maintain because this library should |
| rarely need recompiling. |
| <p> |
| Please refer to the C library documentation for more details about arguments to these calls. |
| <p></div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SEEK_CUR">SEEK_CUR</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">fseek whence argument to indicate that offset is from the current position of the |
| file pointer</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SEEK_END">SEEK_END</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">fseek whence argument to indicate that offset is from the end of the file</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SEEK_SET">SEEK_SET</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">fseek whence argument to indicate that offset is from the beginning of the file</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
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| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">Clib</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fgetpos(long,int%5B%5D)">fgetpos</a></span>​(long fp, |
| int[] pos)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around fgetpos.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fopen(byte%5B%5D,byte%5B%5D)">fopen</a></span>​(byte[] filename, |
| byte[] mode)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around fopen.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fopen(java.lang.String,java.lang.String)">fopen</a></span>​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> filename, |
| <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> mode)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a slightly friendlier version of the native fopen call (the |
| parameters are Strings rather than byte arrays otherwise everything is the same).</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fread(byte%5B%5D,int,int,long)">fread</a></span>​(byte[] buf, |
| int size, |
| int count, |
| long fp)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around fread.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fseek(long,long,int)">fseek</a></span>​(long fp, |
| long offset, |
| int whence)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around fseek.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fsetpos(long,int%5B%5D)">fsetpos</a></span>​(long fp, |
| int[] pos)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around fsetpos.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#perror(byte%5B%5D)">perror</a></span>​(byte[] prefix)</code></th> |
| <td class="colLast"> |
| <div class="block">This method is a wrapper around perror.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#perror(java.lang.String)">perror</a></span>​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> prefix)</code></th> |
| <td class="colLast"> |
| <div class="block">Friendlier version of the native perror call that accepts a String parameter.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods declared in class java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink" target="_blank">clone</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink" target="_blank">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink" target="_blank">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink" target="_blank">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink" target="_blank">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink" target="_blank">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink" target="_blank">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink" target="_blank">toString</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_blank">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SEEK_SET</h4> |
| <pre>public static final int SEEK_SET</pre> |
| <div class="block">fseek whence argument to indicate that offset is from the beginning of the file</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../constant-values.html#com.ibm.dtfj.corereaders.zos.util.Clib.SEEK_SET">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="SEEK_CUR"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SEEK_CUR</h4> |
| <pre>public static final int SEEK_CUR</pre> |
| <div class="block">fseek whence argument to indicate that offset is from the current position of the |
| file pointer</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../constant-values.html#com.ibm.dtfj.corereaders.zos.util.Clib.SEEK_CUR">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="SEEK_END"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>SEEK_END</h4> |
| <pre>public static final int SEEK_END</pre> |
| <div class="block">fseek whence argument to indicate that offset is from the end of the file</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../constant-values.html#com.ibm.dtfj.corereaders.zos.util.Clib.SEEK_END">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>()"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>Clib</h4> |
| <pre>public Clib()</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a id="fopen(byte[],byte[])"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>fopen</h4> |
| <pre class="methodSignature">public static long fopen​(byte[] filename, |
| byte[] mode)</pre> |
| <div class="block">This method is a wrapper around fopen.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>filename</code> - the name of the file to open as a null-terminated ebcdic byte array</dd> |
| <dd><code>mode</code> - the open mode which must be a null-terminated ebcdic byte array. See the |
| C library fopen documentation for more details</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the FILE stream pointer from fopen cast to a long</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="fopen(java.lang.String,java.lang.String)"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>fopen</h4> |
| <pre class="methodSignature">public static long fopen​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> filename, |
| <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> mode)</pre> |
| <div class="block">This method is a slightly friendlier version of the native fopen call (the |
| parameters are Strings rather than byte arrays otherwise everything is the same).</div> |
| </li> |
| </ul> |
| <a id="fgetpos(long,int[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>fgetpos</h4> |
| <pre class="methodSignature">public static int fgetpos​(long fp, |
| int[] pos)</pre> |
| <div class="block">This method is a wrapper around fgetpos. Here we make use of the knowledge that a C |
| fpos_t on z/OS is actually an array of 8 ints.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fp</code> - the stream obtained from an earlier call to fopen</dd> |
| <dd><code>pos</code> - this must be an array of 8 ints. The position indicator is stored in |
| this array. The same array contents may be passed to a subsequent fsetpos call.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the return code from the fgetpos call (zero if successful)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="fsetpos(long,int[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>fsetpos</h4> |
| <pre class="methodSignature">public static int fsetpos​(long fp, |
| int[] pos)</pre> |
| <div class="block">This method is a wrapper around fsetpos.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fp</code> - the stream obtained from an earlier call to fopen</dd> |
| <dd><code>pos</code> - this must be an array of 8 ints whose contents were obtained in a previous |
| call to fgetpos.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the return code from the fsetpos call (zero if successful)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="fseek(long,long,int)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>fseek</h4> |
| <pre class="methodSignature">public static int fseek​(long fp, |
| long offset, |
| int whence)</pre> |
| <div class="block">This method is a wrapper around fseek. (Note: this hasn't been tested for seeks |
| over 2GB yet).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fp</code> - the stream obtained from an earlier call to fopen</dd> |
| <dd><code>offset</code> - the offset to seek to</dd> |
| <dd><code>whence</code> - specifies where to seek from</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the return code from the fseek call (zero if successful)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="fread(byte[],int,int,long)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>fread</h4> |
| <pre class="methodSignature">public static int fread​(byte[] buf, |
| int size, |
| int count, |
| long fp)</pre> |
| <div class="block">This method is a wrapper around fread.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buf</code> - the buffer to contain the read data</dd> |
| <dd><code>size</code> - the size of each element</dd> |
| <dd><code>count</code> - the number of elements to read</dd> |
| <dd><code>fp</code> - the stream obtained from an earlier call to fopen</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of elements read</dd> |
| </dl> |
| </li> |
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| <a id="perror(byte[])"> |
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| <h4>perror</h4> |
| <pre class="methodSignature">public static void perror​(byte[] prefix)</pre> |
| <div class="block">This method is a wrapper around perror.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>prefix</code> - the message prefix as a null-terminated ebcdic byte array</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="perror(java.lang.String)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>perror</h4> |
| <pre class="methodSignature">public static void perror​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a> prefix)</pre> |
| <div class="block">Friendlier version of the native perror call that accepts a String parameter.</div> |
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