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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="comment">/* -*- linux-c -*- */</span><span class="comment"></span>
00002 <span class="comment">/** @file probes.c</span>
00003 <span class="comment"> * @brief Functions to assist loading and unloading groups of probes.</span>
00004 <span class="comment"> */</span>
00005 <span class="comment"></span>
00006 <span class="comment">/** Lookup name.</span>
00007 <span class="comment"> * This simply calls the kernel function kallsyms_lookup_name().</span>
00008 <span class="comment"> * That function is not exported, so this workaround is required.</span>
00009 <span class="comment"> * See the kernel source, kernel/kallsyms.c for more information.</span>
00010 <span class="comment"> */</span>
<a name="l00011"></a><a class="code" href="probes_8c.html#a0">00011</a> <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;
00012 <span class="comment"></span>
00013 <span class="comment">/** Unregister a group of jprobes.</span>
00014 <span class="comment"> * @param probes Pointer to an array of struct jprobe.</span>
00015 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00016 <span class="comment"> */</span>
00017
<a name="l00018"></a><a class="code" href="probes_8c.html#a1">00018</a> <span class="keywordtype">void</span> <a class="code" href="probes_8c.html#a1">_stp_unregister_jprobes</a> (<span class="keyword">struct</span> jprobe *probes, <span class="keywordtype">int</span> num_probes)
00019 {
00020 <span class="keywordtype">int</span> i;
00021 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++)
00022 unregister_jprobe(&probes[i]);
00023 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"All jprobes removed\n"</span>);
00024 }
00025 <span class="comment"></span>
00026 <span class="comment">/** Register a group of jprobes.</span>
00027 <span class="comment"> * @param probes Pointer to an array of struct jprobe.</span>
00028 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00029 <span class="comment"> * @return 0 on success.</span>
00030 <span class="comment"> */</span>
00031
<a name="l00032"></a><a class="code" href="probes_8c.html#a2">00032</a> <span class="keywordtype">int</span> <a class="code" href="probes_8c.html#a2">_stp_register_jprobes</a> (<span class="keyword">struct</span> jprobe *probes, <span class="keywordtype">int</span> num_probes)
00033 {
00034 <span class="keywordtype">int</span> i, ret ;
00035 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00036
00037 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++) {
00038 addr =<a class="code" href="probes_8c.html#a0">_stp_lookup_name</a>((<span class="keywordtype">char</span> *)probes[i].kp.addr);
00039 <span class="keywordflow">if</span> (addr == 0) {
00040 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"ERROR: function %s not found!\n"</span>,
00041 (<span class="keywordtype">char</span> *)probes[i].kp.addr);
00042 ret = -1; <span class="comment">/* FIXME */</span>
00043 <span class="keywordflow">goto</span> out;
00044 }
00045 <a class="code" href="io_8c.html#a4">dlog</a>(<span class="stringliteral">"inserting jprobe at %s (%p)\n"</span>, probes[i].kp.addr, addr);
00046 probes[i].kp.addr = (kprobe_opcode_t *)addr;
00047 ret = register_jprobe(&probes[i]);
00048 <span class="keywordflow">if</span> (ret)
00049 <span class="keywordflow">goto</span> out;
00050 }
00051 <span class="keywordflow">return</span> 0;
00052 out:
00053 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"probe module initialization failed. Exiting...\n"</span>);
00054 <a class="code" href="probes_8c.html#a1">_stp_unregister_jprobes</a>(probes, i);
00055 <span class="keywordflow">return</span> ret;
00056 }
00057 <span class="comment"></span>
00058 <span class="comment">/** Unregister a group of kprobes.</span>
00059 <span class="comment"> * @param probes Pointer to an array of struct kprobe.</span>
00060 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00061 <span class="comment"> */</span>
00062
<a name="l00063"></a><a class="code" href="probes_8c.html#a3">00063</a> <span class="keywordtype">void</span> <a class="code" href="probes_8c.html#a3">_stp_unregister_kprobes</a> (<span class="keyword">struct</span> kprobe *probes, <span class="keywordtype">int</span> num_probes)
00064 {
00065 <span class="keywordtype">int</span> i;
00066 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++)
00067 unregister_kprobe(&probes[i]);
00068 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"All kprobes removed\n"</span>);
00069 }
00070 <span class="comment"></span>
00071 <span class="comment">/** Register a group of kprobes.</span>
00072 <span class="comment"> * @param probes Pointer to an array of struct kprobe.</span>
00073 <span class="comment"> * @param num_probes Number of probes in the array.</span>
00074 <span class="comment"> * @return 0 on success.</span>
00075 <span class="comment"> */</span>
00076
<a name="l00077"></a><a class="code" href="probes_8c.html#a4">00077</a> <span class="keywordtype">int</span> <a class="code" href="probes_8c.html#a4">_stp_register_kprobes</a> (<span class="keyword">struct</span> kprobe *probes, <span class="keywordtype">int</span> num_probes)
00078 {
00079 <span class="keywordtype">int</span> i, ret ;
00080 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00081
00082 <span class="keywordflow">for</span> (i = 0; i < num_probes; i++) {
00083 addr =<a class="code" href="probes_8c.html#a0">_stp_lookup_name</a>((<span class="keywordtype">char</span> *)probes[i].addr);
00084 <span class="keywordflow">if</span> (addr == 0) {
00085 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"ERROR: function %s not found!\n"</span>,
00086 (<span class="keywordtype">char</span> *)probes[i].addr);
00087 ret = -1; <span class="comment">/* FIXME */</span>
00088 <span class="keywordflow">goto</span> out;
00089 }
00090 <a class="code" href="io_8c.html#a4">dlog</a>(<span class="stringliteral">"inserting kprobe at %s (%p)\n"</span>, probes[i].addr, addr);
00091 probes[i].addr = (kprobe_opcode_t *)addr;
00092 ret = register_kprobe(&probes[i]);
00093 <span class="keywordflow">if</span> (ret)
00094 <span class="keywordflow">goto</span> out;
00095 }
00096 <span class="keywordflow">return</span> 0;
00097 out:
00098 <a class="code" href="io_8c.html#a4">dlog</a> (<span class="stringliteral">"probe module initialization failed. Exiting...\n"</span>);
00099 <a class="code" href="probes_8c.html#a3">_stp_unregister_kprobes</a>(probes, i);
00100 <span class="keywordflow">return</span> ret;
00101 }
00102
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