From 4a0897526bbc5c6ac0df80b16b8c60339e717ae2 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 18 Jul 2008 12:16:16 -0400 Subject: tracing: tracepoints, samples Tracepoint example code under samples/. Signed-off-by: Mathieu Desnoyers Acked-by: 'Peter Zijlstra' Signed-off-by: Ingo Molnar --- samples/tracepoints/tracepoint-sample.c | 53 +++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 samples/tracepoints/tracepoint-sample.c (limited to 'samples/tracepoints/tracepoint-sample.c') diff --git a/samples/tracepoints/tracepoint-sample.c b/samples/tracepoints/tracepoint-sample.c new file mode 100644 index 000000000000..4ae4b7fcc043 --- /dev/null +++ b/samples/tracepoints/tracepoint-sample.c @@ -0,0 +1,53 @@ +/* tracepoint-sample.c + * + * Executes a tracepoint when /proc/tracepoint-example is opened. + * + * (C) Copyright 2007 Mathieu Desnoyers + * + * This file is released under the GPLv2. + * See the file COPYING for more details. + */ + +#include +#include +#include +#include "tp-samples-trace.h" + +struct proc_dir_entry *pentry_example; + +static int my_open(struct inode *inode, struct file *file) +{ + int i; + + trace_subsys_event(inode, file); + for (i = 0; i < 10; i++) + trace_subsys_eventb(); + return -EPERM; +} + +static struct file_operations mark_ops = { + .open = my_open, +}; + +static int example_init(void) +{ + printk(KERN_ALERT "example init\n"); + pentry_example = proc_create("tracepoint-example", 0444, NULL, + &mark_ops); + if (!pentry_example) + return -EPERM; + return 0; +} + +static void example_exit(void) +{ + printk(KERN_ALERT "example exit\n"); + remove_proc_entry("tracepoint-example", NULL); +} + +module_init(example_init) +module_exit(example_exit) + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Tracepoint example"); -- cgit v1.2.3