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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>SystemTap: io.c File Reference</title>
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<h1>io.c File Reference</h1>I/O functions. <a href="#_details">More...</a>
<p>
<p>
<a href="io_8c-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a0" doxytag="io.c::STP_BUF_LEN"></a>
#define </td><td class="memItemRight" valign="bottom"><b>STP_BUF_LEN</b> 8191</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a4">dlog</a> (const char *fmt,...)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Logs data. <a href="#a4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a5">_stp_print_buf</a> (const char *fmt,...)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Print into the print buffer. <a href="#a5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a6">_stp_print_buf_init</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clear the print buffer. <a href="#a6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a7">_stp_print_symbol</a> (const char *fmt, unsigned long address)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Print addresses symbolically into the print buffer. <a href="#a7"></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="io_8c.html#a8">cur_ret_addr</a> (struct pt_regs *regs)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current return address. <a href="#a8"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Variables</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static const char *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a1">_stp_kallsyms_lookup</a> )(unsigned long addr, unsigned long *symbolsize, unsigned long *offset, char **modname, char *namebuf) = (void *)KALLSYMS_LOOKUP</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Lookup symbol. <a href="#a1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a2" doxytag="io.c::_stp_pbuf"></a>
static char </td><td class="memItemRight" valign="bottom"><a class="el" href="io_8c.html#a2">_stp_pbuf</a> [8191+1]</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Static buffer for printing. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a3" doxytag="io.c::_stp_pbuf_len"></a>
static int </td><td class="memItemRight" valign="bottom"><b>_stp_pbuf_len</b> = 8191</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
I/O functions.
<p>
<p>
Definition in file <a class="el" href="io_8c-source.html">io.c</a>.<hr><h2>Function Documentation</h2>
<a class="anchor" name="a5" doxytag="io.c::_stp_print_buf"></a><p>
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<td class="md" nowrap valign="top">void _stp_print_buf </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const char * </td>
<td class="mdname" nowrap> <em>fmt</em>, </td>
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Print into the print buffer.
<p>
Like printf, except output goes into _stp_pbuf, which will contain the null-terminated output. Safe because overflowing _stp_pbuf is not allowed. Size is limited by length of print buffer.<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>fmt</em> </td><td>A variable number of args. </td></tr>
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<dl compact><dt><b>Note:</b></dt><dd>Formatting output should never be done within a probe. Use at module exit time. </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="io_8c.html#a6">_stp_print_buf_init</a> </dd></dl>
<p>
Definition at line <a class="el" href="io_8c-source.html#l00055">55</a> of file <a class="el" href="io_8c-source.html">io.c</a>.
<p>
References <a class="el" href="io_8c-source.html#l00040">_stp_pbuf</a>.
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Referenced by <a class="el" href="io_8c-source.html#l00085">_stp_print_symbol()</a>. </td>
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<a class="anchor" name="a6" doxytag="io.c::_stp_print_buf_init"></a><p>
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<td class="md" nowrap valign="top">void _stp_print_buf_init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
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Clear the print buffer.
<p>
Output from <a class="el" href="io_8c.html#a5">_stp_print_buf()</a> will accumulate in the buffer until this is called.
<p>
Definition at line <a class="el" href="io_8c-source.html#l00072">72</a> of file <a class="el" href="io_8c-source.html">io.c</a>.
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References <a class="el" href="io_8c-source.html#l00040">_stp_pbuf</a>. </td>
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<a class="anchor" name="a7" doxytag="io.c::_stp_print_symbol"></a><p>
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<td class="md" nowrap valign="top">void _stp_print_symbol </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const char * </td>
<td class="mdname" nowrap> <em>fmt</em>, </td>
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<td class="md" nowrap>unsigned long </td>
<td class="mdname" nowrap> <em>address</em></td>
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<td class="md">) </td>
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<p>
Print addresses symbolically into the print buffer.
<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>fmt</em> </td><td>A variable number of args. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>address</em> </td><td>The address to lookup. </td></tr>
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</dl>
<dl compact><dt><b>Note:</b></dt><dd>Formatting output should never be done within a probe. Use at module exit time. </dd></dl>
<p>
Definition at line <a class="el" href="io_8c-source.html#l00085">85</a> of file <a class="el" href="io_8c-source.html">io.c</a>.
<p>
References <a class="el" href="io_8c-source.html#l00031">_stp_kallsyms_lookup</a>, and <a class="el" href="io_8c-source.html#l00055">_stp_print_buf()</a>. </td>
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<a class="anchor" name="a8" doxytag="io.c::cur_ret_addr"></a><p>
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<td class="md" nowrap valign="top">unsigned long cur_ret_addr </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">struct pt_regs * </td>
<td class="mdname1" valign="top" nowrap> <em>regs</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<p>
Get the current return address.
<p>
Call from kprobes (not jprobes). <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>regs</em> </td><td>The pt_regs saved by the kprobe. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>The return address saved in esp or rsp. </dd></dl>
<dl compact><dt><b>Note:</b></dt><dd>i386 and x86_64 only. </dd></dl>
<p>
Definition at line <a class="el" href="io_8c-source.html#l00112">112</a> of file <a class="el" href="io_8c-source.html">io.c</a>. </td>
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<a class="anchor" name="a4" doxytag="io.c::dlog"></a><p>
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<td class="md" nowrap valign="top">void dlog </td>
<td class="md" valign="top">( </td>
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<p>
Logs data.
<p>
This function is compatible with printk. In fact it currently sends all output to vprintk, after sending "STP: ". This allows us to easily detect SystemTap output in the log file.<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>fmt</em> </td><td>A variable number of args. </td></tr>
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<dl compact><dt><b><a class="el" href="bug.html#_bug000003">Bug:</a></b></dt><dd>Lines are limited in length by printk buffer.</dd></dl>
<p>
<dl compact><dt><b><a class="el" href="todo.html#_todo000002">Todo:</a></b></dt><dd>Needs replaced with something much faster that does not use the system log. </dd></dl>
<p>
Definition at line <a class="el" href="io_8c-source.html#l00016">16</a> of file <a class="el" href="io_8c-source.html">io.c</a>.
<p>
Referenced by <a class="el" href="map_8c-source.html#l00794">_stp_list_clear()</a>, <a class="el" href="probes_8c-source.html#l00032">_stp_register_jprobes()</a>, <a class="el" href="probes_8c-source.html#l00077">_stp_register_kprobes()</a>, <a class="el" href="probes_8c-source.html#l00018">_stp_unregister_jprobes()</a>, and <a class="el" href="probes_8c-source.html#l00063">_stp_unregister_kprobes()</a>. </td>
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<hr><h2>Variable Documentation</h2>
<a class="anchor" name="a1" doxytag="io.c::_stp_kallsyms_lookup"></a><p>
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<td class="md" nowrap valign="top">const char*(* <a class="el" href="io_8c.html#a1">_stp_kallsyms_lookup</a>)(unsigned long addr, unsigned long *symbolsize, unsigned long *offset, char **modname, char *namebuf) = (void *)KALLSYMS_LOOKUP<code> [static]</code> </td>
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Lookup symbol.
<p>
This simply calls the kernel function kallsyms_lookup(). That function is not exported, so this workaround is required. See the kernel source, kernel/kallsyms.c for more information.
<p>
Definition at line <a class="el" href="io_8c-source.html#l00031">31</a> of file <a class="el" href="io_8c-source.html">io.c</a>.
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Referenced by <a class="el" href="io_8c-source.html#l00085">_stp_print_symbol()</a>. </td>
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<hr size="1"><address style="align: right;"><small>
Generated on Tue Mar 22 10:27:36 2005 for SystemTap.</small></body>
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