186 lines
4.7 KiB
HTML
186 lines
4.7 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=utf-8">
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<title>QzshCheckShellCommand() - Find QSH Command</title>
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<LINK rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</HEAD>
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<body bgcolor="#FFFFFF">
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2>QzshCheckShellCommand() - Find QSH Command</h2>
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<table border cellpadding="10" width="100%">
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<tr>
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<td>Syntax
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<pre>
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#include <qshell.h>
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int QzshCheckShellCommand( const char <em>*command</em>, const char <em>*path</em> );
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</pre>
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<p><br>
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Threadsafe: Yes</p>
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</td>
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</tr>
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</table>
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<p>The <strong>QzshCheckShellCommand()</strong> function finds the
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specified shell command by searching:</p>
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<ul>
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<li>for a built-in utility, then</li>
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<li>in each directory in the list specified by <em>path</em> or the
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<strong>PATH</strong> environment variable in turn.</li>
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</ul>
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<p>An application can use <strong>QzshCheckShellCommand()</strong>
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to verify that <em>command</em> exists and the user has authority
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to <em>command</em> before running it.
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<p><strong>Parameters</strong></p>
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<p><em>*command</em><br>
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(Input) Pointer to null-terminated string that contains the shell
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command to find.</p>
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<p><em>*path</em><br>
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(Input) Pointer to null-terminated string that contains a colon
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delimited list of directories to search. If this parameter is NULL,
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<strong>QzshCheckShellCommand()</strong> uses the value of the
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<strong>PATH</strong> environment variable.
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<p><strong>Authorities</strong></p>
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<p>When command is an executable file, the user must have the
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following authorities.</p>
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<table border cellpadding="5" width="100%">
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<tr>
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<th>Object Referred To</th>
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<th>Authority Required</th>
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<th>errno</th>
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</tr>
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<tr>
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<td width="60%">Each directory in the path name preceding the executable
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file</td>
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<td width="20%">*X</td>
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<td width="20%">EACCES</td>
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</tr>
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<tr>
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<td>Executable file</td>
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<td>*X</td>
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<td>EACCES</td>
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</tr>
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<tr>
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<td>If executable file is a shell script</td>
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<td>*RX</td>
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<td>EACCES</td>
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</tr>
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</table>
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<p><strong>Return value</strong></p>
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<dl>
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<dt><strong>0</strong></dt>
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<dd><strong>QzshCheckShellCommand()</strong> was successful. The
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<em>command</em> was found in the current environment.<p></dd>
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<dt><strong>-1</strong></dt>
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<dd><strong>Qp0zCheckShellCommand()</strong> was not successful.
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The <em>errno</em> value is set to indicate the error.<p></dd>
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</dl>
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<p><strong>Error conditions</strong></p>
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<p>If <strong>QzshCheckShellCommand()</strong> is not successful,
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<em>errno</em> typically indicates one of the following errors. Under
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some conditions, <em>errno</em> could indicate an error other than
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those listed here.</p>
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<dl>
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<dt><strong>[EACCES]</strong></dt>
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<dd>Permission denied.<p></dd>
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<dd>An attempt was made to access an object in a way forbidden by
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its object access permissions.<p></dd>
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<dd>The thread does not have access to the specified file,
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directory, component, or path.<p></dd>
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<dt><strong>[EFAULT]</strong></dt>
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<dd>The address used for an argument is not correct.<p></dd>
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<dd>In attempting to use an argument in a call, the system detected
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an address that is not valid.<p></dd>
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<dd>While attempting to access a parameter passed to this function,
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the system detected an address that is not valid.<p></dd>
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<dt><strong>[EINVAL]</strong></dt>
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<dd>The value specified for the argument is not correct.<p></dd>
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<dd>A function was passed incorrect argument values, or an
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operation was attempted on an object and the operation specified is
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not supported for that type of object.<p></dd>
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<dt><strong>[ENOMEM]</strong></dt>
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<dd>Storage allocation request failed.<p></dd>
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<dd>A function needed to allocate storage, but no storage is
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available.<p></dd>
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<dd>There is not enough memory to perform the requested
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function.<p></dd>
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<dt><strong>[ENOENT]</strong></dt>
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<dd>No such path or directory.<p></dd>
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<dd>The directory or component of the path name specified does not
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exist.<p></dd>
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<dd>A named file or directory does not exist or is an empty
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string.<p></dd>
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<dt><strong>[EUNKNOWN]</strong></dt>
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<dd>Unknown system state.<p></dd>
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<dd>The operation failed because of an unknown system state. See
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any messages in the job log and correct any errors that are
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indicated. Then retry the operation.<p></dd>
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</dl>
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<p><strong>Related information</strong></p>
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<ul>
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<li><a href="qzshsyst.htm"><strong>QzshSystem()</strong> - Run a
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QSH command</a></li>
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</ul>
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<p><strong>Example: Using the QzshCheckShellCommand()
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function</strong></p>
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<p>For an example of using this function, see the <a href=
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"qzshsyst.htm"><strong>QzshSystem()</strong></a> function.</p>
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</body>
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</html>
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