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<title>SystemTap: Functions to copy from user space.</title>
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<h1>Functions to copy from user space.</h1>Functions to copy from user space.
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__copy.html#ga0">_stp_strncpy_from_user</a> (char *dst, const char __user *src, long count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy a NULL-terminated string from userspace. <a href="#ga0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__copy.html#ga1">_stp_string_from_user</a> (String str, const char __user *src, long count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy a String from userspace. <a href="#ga1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">unsigned long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__copy.html#ga2">_stp_copy_from_user</a> (char *dst, const char __user *src, unsigned long count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy a block of data from user space. <a href="#ga2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__copy.html#ga3">_stp_copy_argv_from_user</a> (<a class="el" href="group__maps.html#ga1">MAP</a> list, char __user *__user *argv)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy an argv from user space to a List. <a href="#ga3"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Functions to copy from user space.
<p>
None of these functions will sleep (for example to allow pages to be swapped in). It is possible (although rare) that the data in user space will not present and these functions will return an error. <hr><h2>Function Documentation</h2>
<a class="anchor" name="ga3" doxytag="copy.c::_stp_copy_argv_from_user"></a><p>
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<td class="md" nowrap valign="top">int _stp_copy_argv_from_user </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__maps.html#ga1">MAP</a> </td>
<td class="mdname" nowrap> <em>list</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>char __user *__user * </td>
<td class="mdname" nowrap> <em>argv</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
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</td>
</tr>
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<table cellspacing="5" cellpadding="0" border="0">
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</td>
<td>
<p>
Copy an argv from user space to a List.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>list</em> </td><td>A list. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>argv</em> </td><td>Source argv, in user space. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>number of elements in <em>list</em></dd></dl>
<b>Example:</b> <div class="fragment"><pre class="fragment"><a class="code" href="group__maps.html#ga1">MAP</a> arglist ;
<span class="keywordtype">int</span> inst_do_execve (<span class="keywordtype">char</span> * filename, <span class="keywordtype">char</span> __user *__user *argv, <span class="keywordtype">char</span> __user *__user *envp, <span class="keyword">struct</span> pt_regs * regs)
{
<span class="keyword">struct </span>map_node_str *ptr;
<a class="code" href="group__lists.html#ga1">_stp_list_clear</a> (arglist);
<a class="code" href="group__copy.html#ga3">_stp_copy_argv_from_user</a> (arglist, argv);
<a class="code" href="group__maps.html#ga32">foreach</a> (arglist, ptr)
printk ("%s ", ptr->str);
printk ("\n");
}
</pre></div>
<p>
Definition at line <a class="el" href="copy_8c-source.html#l00154">154</a> of file <a class="el" href="copy_8c-source.html">copy.c</a>.
<p>
References <a class="el" href="map_8c-source.html#l00872">_stp_list_add_str()</a>, and <a class="el" href="copy_8c-source.html#l00096">_stp_strncpy_from_user()</a>. </td>
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<a class="anchor" name="ga2" doxytag="copy.c::_stp_copy_from_user"></a><p>
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<td class="md" nowrap valign="top">unsigned long _stp_copy_from_user </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">char * </td>
<td class="mdname" nowrap> <em>dst</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char __user * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>unsigned long </td>
<td class="mdname" nowrap> <em>count</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Copy a block of data from user space.
<p>
If some data could not be copied, this function will pad the copied data to the requested size using zero bytes.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dst</em> </td><td>Destination address, in kernel space. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>Source address, in user space. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>count</em> </td><td>Number of bytes to copy. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>number of bytes that could not be copied. On success, this will be zero. </dd></dl>
<p>
Definition at line <a class="el" href="copy_8c-source.html#l00139">139</a> of file <a class="el" href="copy_8c-source.html">copy.c</a>. </td>
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<a class="anchor" name="ga1" doxytag="copy.c::_stp_string_from_user"></a><p>
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<td class="md" nowrap valign="top">void _stp_string_from_user </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">String </td>
<td class="mdname" nowrap> <em>str</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char __user * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>long </td>
<td class="mdname" nowrap> <em>count</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Copy a String from userspace.
<p>
Copies a string of up to <em>count</em> bytes from userspace into a String. If access to userspace fails, returns -EFAULT (some data may have been copied). <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>str</em> </td><td>Destination String. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>Source address, in user space. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>count</em> </td><td>Maximum number of bytes to copy, including the trailing NULL. </td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="copy_8c-source.html#l00113">113</a> of file <a class="el" href="copy_8c-source.html">copy.c</a>.
<p>
References <a class="el" href="string_8c-source.html#l00020">STP_STRING_SIZE</a>. </td>
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<a class="anchor" name="ga0" doxytag="copy.c::_stp_strncpy_from_user"></a><p>
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<td class="md" nowrap valign="top">long _stp_strncpy_from_user </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">char * </td>
<td class="mdname" nowrap> <em>dst</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char __user * </td>
<td class="mdname" nowrap> <em>src</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>long </td>
<td class="mdname" nowrap> <em>count</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Copy a NULL-terminated string from userspace.
<p>
On success, returns the length of the string (not including the trailing NULL).<p>
If access to userspace fails, returns -EFAULT (some data may have been copied). <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dst</em> </td><td>Destination address, in kernel space. This buffer must be at least <em>count</em> bytes long. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>Source address, in user space. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>count</em> </td><td>Maximum number of bytes to copy, including the trailing NULL.</td></tr>
</table>
</dl>
If <em>count</em> is smaller than the length of the string, copies <em>count</em> bytes and returns <em>count</em>. <p>
<dl compact><dt><b><a class="el" href="deprecated.html#_deprecated000001">Deprecated:</a></b></dt><dd>I can't think of why you wouldn't use <a class="el" href="group__copy.html#ga1">_stp_string_from_user()</a> instead. </dd></dl>
<p>
Definition at line <a class="el" href="copy_8c-source.html#l00096">96</a> of file <a class="el" href="copy_8c-source.html">copy.c</a>.
<p>
Referenced by <a class="el" href="copy_8c-source.html#l00154">_stp_copy_argv_from_user()</a>. </td>
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