int genders_getnodes(genders_t handle, char *nodes, int len, const char *attr, const char *val);
genders_getnodes() gets the names of nodes in the genders file
that have the attribute specified by attr and the value
specified by val. The nodes are stored in the list pointed to
by nodes. len indicates the number of nodes that can be
stored in the list. If attr is NULL, genders_getnodes()
returns all the nodes listed in the genders file. If val is
NULL, attribute values are ignored.
To avoid passing in a list that is not large enough to store all the
should be used to determine the minimum number of elements nodes
should be able to store.
could be used to create a list that is guaranteed to be large enough
to store all of the nodes.
On success, the number of nodes stored in nodes is returned. On
error, -1 is returned, and an error code is returned in handle.
The error code can be retrieved via
, and a description of the error code can be retrieved via
Error codes are defined in genders.h.