225 lines
5.8 KiB
HTML
225 lines
5.8 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>Qp0zSystem() - Run a 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>QzshSystem() - Run a 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 QzshSystem( const char <em>*command</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>QzshSystem()</strong> function runs the specified
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shell command by spawning a child process and invoking <strong>
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qsh</strong> in the child process. <strong>qsh</strong> interprets
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and runs <em>command</em> and then exits.</p>
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<p>The <strong>QzshSystem()</strong> function returns when the
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child process has ended. While the <strong>QzshSystem()</strong>
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function is waiting for the child process to end, it ignores the
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SIGQUIT and SIGINT signals, and blocks the SIGCHLD signal. The
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<strong>QzshSystem()</strong> function does not affect the status
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information of any other child processes started by the calling
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process.
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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 run.
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<p><strong>Authorities</strong></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>value</strong></dt>
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<dd><strong>QzshSystem()</strong> was successful. The return value
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is the status returned from the <strong>waitpid()</strong>
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function. An application can use the macros provided in the
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sys/wait.h header file to interpret the status information from the
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child process. The return value can be a negative number.<p></dd>
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<dt><strong>-1</strong></dt>
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<dd><strong>QzshSystem()</strong> was not successful. The <em>
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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>QzshSystem()</strong> is not successful, <i>errno</i>
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typically indicates one of the following errors. Under some
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conditions, <i>errno</i> could indicate an error other than those
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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>[ECHILD]</strong></dt>
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<dd>Calling process has no remaining child processes on which wait
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operation can be performed.<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>[ENOSYSRSC]</strong></dt>
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<dd>System resources not available to complete request.<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 try the operation again.<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="qzshchkc.htm">QzshCheckShellCommand()
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- Find QSH command</a></li>
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<li><a href="../apis/spawn.htm">spawn() - Spawn Process</a></li>
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<li><a href="../apis/waitpid.htm">waitpid() - Wait for Specific Child
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Process</a></li>
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</ul>
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<p><strong>Example: Using the QzshSystem() and QzshCheckShellCommand()
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functions</strong></p>
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<p>The following example shows how to use the <strong>
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QzshSystem()</strong> and <strong>QzshCheckShellCommand()</strong>
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functions.</p>
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<pre>
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#include <stdio.h>
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#include <qshell.h>
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#include <sys/wait.h>
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#include <errno.h>
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int main(int argc, char *argv[])
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{
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int status;
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char *command = "ls";
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/* Verify the user has access to the specified command. */
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if (QzshCheckShellCommand(command, NULL) == 0) {
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/* Run the specified command. */
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status = QzshSystem(command);
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if (WIFEXITED(status)) {
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printf("Command %s completed with exit status %d.\n",
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command, WEXITSTATUS(status));
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}
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else if (WIFSIGNALED(status)) {
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printf("Command %s ended with signal %d.\n",
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command, WTERMSIG(status));
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}
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else if (WIFEXCEPTION(status)) {
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printf("Command %s ended with exception.\n", command);
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}
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}
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else
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printf("Error %d finding command %s\n", errno, command);
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return(0);
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}
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</pre>
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<strong>Output</strong>
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<pre>
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Command ls completed with exit status 0.
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</pre>
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</body>
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</html>
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