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authorNeilBrown <neilb@suse.de>2006-03-20 17:53:53 +1100
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:41:24 -0700
commit4508a7a734b111b8b7e39986237d84acb1168dd0 (patch)
tree8fe535fbb97d619c9069da26367ead03d1a294aa /lib
parent[PATCH] Enhancing accessibility of lxdialog (diff)
downloadlinux-dev-4508a7a734b111b8b7e39986237d84acb1168dd0.tar.xz
linux-dev-4508a7a734b111b8b7e39986237d84acb1168dd0.zip
[PATCH] sysfs: Allow sysfs attribute files to be pollable
It works like this: Open the file Read all the contents. Call poll requesting POLLERR or POLLPRI (so select/exceptfds works) When poll returns, close the file and go to top of loop. or lseek to start of file and go back to the 'read'. Events are signaled by an object manager calling sysfs_notify(kobj, dir, attr); If the dir is non-NULL, it is used to find a subdirectory which contains the attribute (presumably created by sysfs_create_group). This has a cost of one int per attribute, one wait_queuehead per kobject, one int per open file. The name "sysfs_notify" may be confused with the inotify functionality. Maybe it would be nice to support inotify for sysfs attributes as well? This patch also uses sysfs_notify to allow /sys/block/md*/md/sync_action to be pollable Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib')
-rw-r--r--lib/kobject.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/kobject.c b/lib/kobject.c
index 25204a41a9b0..01d957513940 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -128,6 +128,7 @@ void kobject_init(struct kobject * kobj)
{
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
+ init_waitqueue_head(&kobj->poll);
kobj->kset = kset_get(kobj->kset);
}