|gensio_open(3)||Library Functions Manual||gensio_open(3)|
NAME¶gensio_open, gensio_open_s, gensio_open_nochild, gensio_open_nochild_s - Start a connecting gensio
- typedef void (*gensio_done_err)(struct gensio *io, int err,
- int gensio_open(struct gensio *io, gensio_done_err open_done,
- int gensio_open_s(struct gensio *io);
- int gensio_open_nochild(struct gensio *io, gensio_done_err open_done,
- int gensio_open_nochild_s(struct gensio *io);
DESCRIPTION¶gensio_open starts the gensio. gensios recevied from an accepter are open upon receipt, but connecting gensios are started closed and need to be opened before use. If no error is returned, the open_done callback will be called, if there is no error in the callback err value the gensio will be open. This will open all children, too.
Note that the open_done callback will always be called even if you close the gensio before the open_done callback happens or if an error occurs. This is guaranteed.
gensio_open_s is like gensio_open, but waits for the open to complete. Normal gensio processing will happen while waiting. Note that you must be careful to not call this from a callback, you should only call this from a non-callback thread or a runner (see gensio_os_funcs(3) for details on runners).
gensio_open_nochild is like gensio_open, but assumes any child gensios are already open and just opens this gensio. This can be useful if you have a gensio that is already opened (like you received it from an accepter) and you want to stack another gensio on top of it. Only filter gensios will support this.
gensio_open_nochild_s is like gensio_open_nochild, but waits for the open to complete. See the notes on gensio_open_s above for warnings.
RETURN VALUES¶Zero is returned on success, or a gensio error on failure.
SEE ALSO¶gensio_err(3), gensio(5), gensio_os_funcs(3)
|27 Feb 2019|