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-rw-r--r--drivers/char/sysrq.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 2aa79ab..dce4cc0 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -23,6 +23,7 @@
#include <linux/reboot.h>
#include <linux/sysrq.h>
#include <linux/kbd_kern.h>
+#include <linux/proc_fs.h>
#include <linux/quotaops.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -534,3 +535,32 @@ int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
return __sysrq_swap_key_ops(key, NULL, op_p);
}
EXPORT_SYMBOL(unregister_sysrq_key);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ */
+static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count) {
+ char c;
+
+ if (get_user(c, buf))
+ return -EFAULT;
+ __handle_sysrq(c, NULL, 0);
+ }
+ return count;
+}
+
+static const struct file_operations proc_sysrq_trigger_operations = {
+ .write = write_sysrq_trigger,
+};
+
+static int __init sysrq_init(void)
+{
+ proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
+ return 0;
+}
+module_init(sysrq_init);
+#endif
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