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    <p>yes, you can. All kernel messages can hold syslog-ng daemon. For this daemon you can write custom rules and put all messages from your module to specific file. Take first look at /etc/syslog-ng/syslog-ng.conf</p> <p><strong>update</strong></p> <p>By default, all kernel print and printk functions put messages to kernel ring buffer. Userspace programs can access to this ring buffer thought /proc/kmsg file. </p> <p>Syslog-ng will read data from /proc/kmsg, then, via filter (filter is just special pattern) grep output and put data in different output (in this example it will be just text files). If in output buffer we will find output from kernel module "hello", syslog-ng will put messages to /var/log/hello, all other messages will go to /var/log/messages</p> <p>Module source</p> <pre><code>#include &lt;linux/module.h&gt; #include &lt;linux/kernel.h&gt; #define MODNAME "[hello]" int init_module(void) { printk(KERN_WARNING MODNAME "Hello world 1.\n"); return 1; } void cleanup_module(void) { printk(KERN_ALERT "Goodbye world 1.\n"); } </code></pre> <p>After insmod</p> <blockquote> <p>insmod hello-1.ko</p> </blockquote> <p>in /var/log/messages you can find:</p> <blockquote> <p>Sep 20 17:46:20 ns1 kernel: [96643.968650] [hello]Hello world 1.</p> </blockquote> <p>ok, lets configure syslog-ng to catch grep log message (by using pattern [hello])</p> <p>$cat /etc/syslog-ng/syslog-ng.conf</p> <pre><code>@version: 3.2 # $Header: /var/cvsroot/gentoo-x86/app-admin/syslog-ng/files/syslog-ng.conf.gentoo.3.2,v 1.1 2011/01/18 17:44:14 mr_bones_ Exp $ # # Syslog-ng default configuration file for Gentoo Linux options { chain_hostnames(no); stats_freq(43200); mark_freq(3600); }; source src { unix-stream("/dev/log" max-connections(256)); internal(); file("/proc/kmsg"); }; destination messages { file("/var/log/messages"); }; # output file for ower module destination hello_messages { file("/var/log/hello"); }; # grep patterns for ower module filter f_hello { match("hello" value("MESSAGE")); }; filter f_kernel { facility(kern); }; log { source(src); destination(messages); }; log { source(src); destination(console_all); }; # target for logging log { source(src); filter(f_hello); filter(f_kernel); destination(hello_messages); }; </code></pre>
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    1. POIs is possible to pipe kernel messages from a specific process to a file
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    1. POIs is possible to pipe kernel messages from a specific process to a file
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    1. COOK, I guess this wasn't in my Distro so I downloaded it and am taking a look. Any example on the syntax? I get some of it... but I don't see how the filter maps to the process that it's filtering.
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    2. COIt is just simple regexp. I updated answer
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    3. CO+1 excellent answer and example. I'll leave the question open for a day in case there's another answer that doesn't involve me tagging all my prints, but I think this will be accepted. Thanks!
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