diff options
| -rw-r--r-- | bsd-core/drm_auth.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/bsd-core/drm_auth.c b/bsd-core/drm_auth.c index 14cfc225..9b5f4f74 100644 --- a/bsd-core/drm_auth.c +++ b/bsd-core/drm_auth.c @@ -1,4 +1,4 @@ -/* drm_auth.h -- IOCTLs for authentication -*- linux-c -*- +/* drm_auth.c -- IOCTLs for authentication -*- linux-c -*- * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com */ /*- @@ -38,6 +38,9 @@ static int drm_hash_magic(drm_magic_t magic) return magic & (DRM_HASH_SIZE-1); } +/** + * Returns the file private associated with the given magic number. + */ static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic) { drm_magic_entry_t *pt; @@ -54,6 +57,10 @@ static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic) return NULL; } +/** + * Inserts the given magic number into the hash table of used magic number + * lists. + */ static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) { int hash; @@ -83,6 +90,10 @@ static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) return 0; } +/** + * Removes the given magic number from the hash table of used magic number + * lists. + */ static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic) { drm_magic_entry_t *prev = NULL; @@ -113,6 +124,14 @@ static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic) return EINVAL; } +/** + * Called by the client, this returns a unique magic number to be authorized + * by the master. + * + * The master may use its own knowledge of the client (such as the X + * connection that the magic is passed over) to determine if the magic number + * should be authenticated. + */ int drm_getmagic(drm_device_t *dev, void *data, struct drm_file *file_priv) { static drm_magic_t sequence = 0; @@ -125,9 +144,9 @@ int drm_getmagic(drm_device_t *dev, void *data, struct drm_file *file_priv) DRM_LOCK(); do { int old = sequence; - + auth->magic = old+1; - + if (!atomic_cmpset_int(&sequence, old, auth->magic)) continue; } while (drm_find_file(dev, auth->magic)); @@ -141,6 +160,9 @@ int drm_getmagic(drm_device_t *dev, void *data, struct drm_file *file_priv) return 0; } +/** + * Marks the client associated with the given magic number as authenticated. + */ int drm_authmagic(drm_device_t *dev, void *data, struct drm_file *file_priv) { drm_auth_t *auth = data; |