@@ -75,10 +75,19 @@ On other
submit a patch to be included in this section.
On all
- Write a character to /proc/sysrq-trigger. e.g.::
+ Write single character to /proc/sysrq-trigger.
+ Only the first character is processed, the rest of string is ignored.
+ However, it is not recommended to write any extra characters
+ as the behavior is undefined and might change in the future versions.
+ E.g.::
echo t > /proc/sysrq-trigger
+ Alternatively, write multiple characters prepended by underscore.
+ This way, all characters will be processed. E.g.::
+
+ echo _reisub > /proc/sysrq-trigger
+
The :kbd:`<command key>` is case sensitive.
What are the 'command' keys?
@@ -1150,16 +1150,28 @@ EXPORT_SYMBOL(unregister_sysrq_key);
#ifdef CONFIG_PROC_FS
/*
* writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ * Normally only the first character written is processed.
+ * If first character is underscore, all characters are processed.
*/
static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- if (count) {
+ bool bulk = false;
+ size_t i;
+
+ for (i = 0; i < count; i++) {
char c;
- if (get_user(c, buf))
+ if (get_user(c, buf + i))
return -EFAULT;
- __handle_sysrq(c, false);
+
+ if (c == '_')
+ bulk = true;
+ else
+ __handle_sysrq(c, false);
+
+ if (!bulk)
+ break;
}
return count;
Just for convenience. This way we can do: `echo _reisub > /proc/sysrq-trigger` Instead of: `for i in r e i s u b; do echo "$i" > /proc/sysrq-trigger; done;` This can be very useful when trying to execute sysrq combo remotely or from userspace. When sending keys in multiple separate writes, userspace can be killed before whole combo is completed. Therefore putting all keys in single write is more robust approach. Signed-off-by: Tomas Mudrunka <tomas.mudrunka@gmail.com> --- V7 -> V8: Added this list of changes V6 -> V7: Fixed english in documentation V5 -> V6: Documentation now has notice about undefined behavior V4 -> V5: Added this list of changes V3 -> V4: Bulk is now bool instead of char (and fixed typo) V2 -> V3: Fixed code styling (and introduced typo) V1 -> V2: Bulk mode only activated by underscore now, added docs Documentation/admin-guide/sysrq.rst | 11 ++++++++++- drivers/tty/sysrq.c | 18 +++++++++++++++--- 2 files changed, 25 insertions(+), 4 deletions(-)