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| author | lberk <lberk> | 2013-02-26 17:49:09 +0000 |
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| committer | lberk <lberk> | 2013-02-26 17:49:09 +0000 |
| commit | 9bba572d7911c2366c7ac3381b15470c0b835746 (patch) | |
| tree | c72130179d84d2b82bb30a617802f1ac87d17ba9 /SystemTap_Beginners_Guide/utargetvariable.html | |
| parent | add new langref/*.html (diff) | |
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| 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> | 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> |
| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> | 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
| 3 | <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>4.2. Accessing User-Space Target Variables</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Systemtap-SystemTap_Beginners_Guide-2.2-en-US-2.2-2" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="userspace-probing.html" title="Chapter 4. User-Space Probing" /><link rel="prev" href="userspace-probing.html" title="Chapter 4. User-Space Probing" /><link rel="next" href="ustack.html" title="4.3. User-Space Stack Backtraces" /></head><body><p id="title"><a class="left" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="userspace-probing.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="ustack.html"><strong>Next</strong></a></li></ul><div class="section" id="utargetvariable"><div class="titlepage"><div><div><h2 class="title" id="utargetvariable">4.2. Accessing User-Space Target Variables</h2></div></div></div><a id="idp38658544" class="indexterm"></a><div class="para"> | 3 | <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>4.2. Accessing User-Space Target Variables</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Systemtap-SystemTap_Beginners_Guide-2.2-en-US-2.2-2" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="userspace-probing.html" title="Chapter 4. User-Space Probing" /><link rel="prev" href="userspace-probing.html" title="Chapter 4. User-Space Probing" /><link rel="next" href="ustack.html" title="4.3. User-Space Stack Backtraces" /></head><body><p id="title"><a class="left" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="userspace-probing.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="ustack.html"><strong>Next</strong></a></li></ul><div class="section" id="utargetvariable"><div class="titlepage"><div><div><h2 class="title" id="utargetvariable">4.2. Accessing User-Space Target Variables</h2></div></div></div><a id="idm6895616" class="indexterm"></a><div class="para"> |
| 4 | User-space target variables can be accessed in the same manner as described in <a class="xref" href="targetvariables.html">Section 3.3.2, “Target Variables”</a>. However, in Linux there are separate address spaces for the user and kernel code. When using "->" operator SystemTap will access the appropriate address space. For pointers to base types such as integers and strings there are a number of functions listed below to access user-space data. The first argument for each functions is the pointer to the data item. | 4 | User-space target variables can be accessed in the same manner as described in <a class="xref" href="targetvariables.html">Section 3.3.2, “Target Variables”</a>. However, in Linux there are separate address spaces for the user and kernel code. When using "->" operator SystemTap will access the appropriate address space. For pointers to base types such as integers and strings there are a number of functions listed below to access user-space data. The first argument for each functions is the pointer to the data item. |
| 5 | </div><div class="variablelist"><dl><dt class="varlistentry"><span class="term">user_char(<em class="replaceable"><code>address</code></em>)</span></dt><dd><div class="para"> | 5 | </div><div class="variablelist"><dl><dt class="varlistentry"><span class="term">user_char(<em class="replaceable"><code>address</code></em>)</span></dt><dd><div class="para"> |
| 6 | Obtain the character at <em class="replaceable"><code>address</code></em> for the current user process. | 6 | Obtain the character at <em class="replaceable"><code>address</code></em> for the current user process. |