NAME

SYNOPSIS

typedef	void d_priv_dtor_t(void *data);

int
devfs_set_cdevpriv(void *priv, d_priv_dtor_t *dtr);

void
devfs_clear_cdevpriv(void);

DESCRIPTION

The devfs_set_cdevpriv() function associates a data pointed by priv with current calling context (filedescriptor). The data may be retrieved later, possibly from another call performed on this filedescriptor, by the devfs_get_cdevpriv() function. The devfs_clear_cdevpriv() disassociates previously attached data from context. Immediately after devfs_clear_cdevpriv() finished operating, the dtr callback is called, with private data supplied data argument. The devfs_clear_cdevpriv() function will be also be called if the open callback function returns an error code.

On the last filedescriptor close, system automatically arranges devfs_clear_cdevpriv() call.

If successful, the functions return 0.

The function devfs_set_cdevpriv() returns the following values on error:

[ENOENT]

The current call is not associated with some filedescriptor.

[EBUSY]

The private driver data is already associated with current filedescriptor.

The function devfs_get_cdevpriv() returns the following values on error:

[EBADF]

The current call is not associated with some filedescriptor.

[ENOENT]

The private driver data was not associated with current filedescriptor, or devfs_clear_cdevpriv() was called.

SEE ALSO

HISTORY