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<h1>probes.c</h1><a href="probes_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="preprocessor">#ifndef _PROBES_C_ </span><span class="comment">/* -*- linux-c -*- */</span>
00002 <span class="preprocessor">#define _PROBES_C</span>
00003 <span class="preprocessor"></span><span class="comment"></span>
00004 <span class="comment">/** @file probes.c</span>
00005 <span class="comment"> * @brief Functions to assist loading and unloading groups of probes.</span>
00006 <span class="comment"> */</span>
00007 <span class="comment"></span>
00008 <span class="comment">/** Lookup name.</span>
00009 <span class="comment"> * This simply calls the kernel function kallsyms_lookup_name().</span>
00010 <span class="comment"> * That function is not exported, so this workaround is required.</span>
00011 <span class="comment"> * See the kernel source, kernel/kallsyms.c for more information.</span>
00012 <span class="comment"> */</span>
00013 <span class="keyword">static</span> <span class="keywordtype">unsigned</span> long (*_stp_lookup_name)(<span class="keywordtype">char</span> *name)=(<span class="keywordtype">void</span> *)KALLSYMS_LOOKUP_NAME;
00014 <span class="comment"></span>
00015 <span class="comment">/** Unregister a group of jprobes.</span>
00016 <span class="comment"> * @param probes Pointer to an array of struct jprobe.</span>
00017 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00018 <span class="comment"> */</span>
00019
<a name="l00020"></a><a class="code" href="probes_8c.html#a2">00020</a> <span class="keywordtype">void</span> <a class="code" href="probes_8c.html#a2">_stp_unregister_jprobes</a> (<span class="keyword">struct</span> jprobe *probes, <span class="keywordtype">int</span> num_probes)
00021 {
00022 <span class="keywordtype">int</span> i;
00023 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++)
00024 unregister_jprobe(&probes[i]);
00025 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"All jprobes removed\n"</span>);
00026 }
00027 <span class="comment"></span>
00028 <span class="comment">/** Register a group of jprobes.</span>
00029 <span class="comment"> * @param probes Pointer to an array of struct jprobe.</span>
00030 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00031 <span class="comment"> * @return 0 on success.</span>
00032 <span class="comment"> */</span>
00033
<a name="l00034"></a><a class="code" href="probes_8c.html#a3">00034</a> <span class="keywordtype">int</span> <a class="code" href="probes_8c.html#a3">_stp_register_jprobes</a> (<span class="keyword">struct</span> jprobe *probes, <span class="keywordtype">int</span> num_probes)
00035 {
00036 <span class="keywordtype">int</span> i, ret ;
00037 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00038
00039 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++) {
00040 addr =_stp_lookup_name((<span class="keywordtype">char</span> *)probes[i].kp.addr);
00041 <span class="keywordflow">if</span> (addr == 0) {
00042 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"ERROR: function %s not found!\n"</span>,
00043 (<span class="keywordtype">char</span> *)probes[i].kp.addr);
00044 ret = -1; <span class="comment">/* FIXME */</span>
00045 <span class="keywordflow">goto</span> out;
00046 }
00047 <a class="code" href="group__io.html#ga2">_stp_log</a>(<span class="stringliteral">"inserting jprobe at %s (%p)\n"</span>, probes[i].kp.addr, addr);
00048 probes[i].kp.addr = (kprobe_opcode_t *)addr;
00049 ret = register_jprobe(&probes[i]);
00050 <span class="keywordflow">if</span> (ret)
00051 <span class="keywordflow">goto</span> out;
00052 }
00053 <span class="keywordflow">return</span> 0;
00054 out:
00055 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"probe module initialization failed. Exiting...\n"</span>);
00056 <a class="code" href="probes_8c.html#a2">_stp_unregister_jprobes</a>(probes, i);
00057 <span class="keywordflow">return</span> ret;
00058 }
00059 <span class="comment"></span>
00060 <span class="comment">/** Unregister a group of kprobes.</span>
00061 <span class="comment"> * @param probes Pointer to an array of struct kprobe.</span>
00062 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00063 <span class="comment"> */</span>
00064
<a name="l00065"></a><a class="code" href="probes_8c.html#a4">00065</a> <span class="keywordtype">void</span> <a class="code" href="probes_8c.html#a4">_stp_unregister_kprobes</a> (<span class="keyword">struct</span> kprobe *probes, <span class="keywordtype">int</span> num_probes)
00066 {
00067 <span class="keywordtype">int</span> i;
00068 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++)
00069 unregister_kprobe(&probes[i]);
00070 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"All kprobes removed\n"</span>);
00071 }
00072 <span class="comment"></span>
00073 <span class="comment">/** Register a group of kprobes.</span>
00074 <span class="comment"> * @param probes Pointer to an array of struct kprobe.</span>
00075 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00076 <span class="comment"> * @return 0 on success.</span>
00077 <span class="comment"> */</span>
00078
<a name="l00079"></a><a class="code" href="probes_8c.html#a5">00079</a> <span class="keywordtype">int</span> <a class="code" href="probes_8c.html#a5">_stp_register_kprobes</a> (<span class="keyword">struct</span> kprobe *probes, <span class="keywordtype">int</span> num_probes)
00080 {
00081 <span class="keywordtype">int</span> i, ret ;
00082 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00083
00084 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++) {
00085 addr =_stp_lookup_name((<span class="keywordtype">char</span> *)probes[i].addr);
00086 <span class="keywordflow">if</span> (addr == 0) {
00087 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"ERROR: function %s not found!\n"</span>,
00088 (<span class="keywordtype">char</span> *)probes[i].addr);
00089 ret = -1; <span class="comment">/* FIXME */</span>
00090 <span class="keywordflow">goto</span> out;
00091 }
00092 <a class="code" href="group__io.html#ga2">_stp_log</a>(<span class="stringliteral">"inserting kprobe at %s (%p)\n"</span>, probes[i].addr, addr);
00093 probes[i].addr = (kprobe_opcode_t *)addr;
00094 ret = register_kprobe(&probes[i]);
00095 <span class="keywordflow">if</span> (ret)
00096 <span class="keywordflow">goto</span> out;
00097 }
00098 <span class="keywordflow">return</span> 0;
00099 out:
00100 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"probe module initialization failed. Exiting...\n"</span>);
00101 <a class="code" href="probes_8c.html#a4">_stp_unregister_kprobes</a>(probes, i);
00102 <span class="keywordflow">return</span> ret;
00103 }
00104
00105 <span class="preprocessor">#endif </span><span class="comment">/* _PROBES_C */</span>
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