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extmod/modusocket: Implement optional socket.listen backlog argument.

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This follows the CPython change: https://bugs.python.org/issue21455

Socket listen backlog defaults to 2 if not given, based on most bare metal
targets not having many resources for a large backlog.  On UNIX it defaults
to SOMAXCONN or 128, whichever is less.
This commit is contained in:
Jon Bjarni Bjarnason
2022-02-16 11:44:17 -05:00
committed by Damien George
parent d3d862769a
commit 919f696ad2
7 changed files with 54 additions and 22 deletions
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16
extmod/modusocket.c
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@@ -116,9 +116,9 @@ STATIC mp_obj_t socket_bind(mp_obj_t self_in, mp_obj_t addr_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(socket_bind_obj, socket_bind);
// method socket.listen(backlog)
STATIC mp_obj_t socket_listen(mp_obj_t self_in, mp_obj_t backlog) {
mod_network_socket_obj_t *self = MP_OBJ_TO_PTR(self_in);
// method socket.listen([backlog])
STATIC mp_obj_t socket_listen(size_t n_args, const mp_obj_t *args) {
mod_network_socket_obj_t *self = MP_OBJ_TO_PTR(args[0]);
if (self->nic == MP_OBJ_NULL) {
// not connected
@@ -126,14 +126,20 @@ STATIC mp_obj_t socket_listen(mp_obj_t self_in, mp_obj_t backlog) {
mp_raise_OSError(MP_ENOTCONN);
}
mp_int_t backlog = 2;
if (n_args > 1) {
backlog = mp_obj_get_int(args[1]);
backlog = (backlog < 0) ? 0 : backlog;
}
int _errno;
if (self->nic_type->listen(self, mp_obj_get_int(backlog), &_errno) != 0) {
if (self->nic_type->listen(self, backlog, &_errno) != 0) {
mp_raise_OSError(_errno);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(socket_listen_obj, socket_listen);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(socket_listen_obj, 1, 2, socket_listen);
// method socket.accept()
STATIC mp_obj_t socket_accept(mp_obj_t self_in) {