NAME¶genders_testquery - query genders database for a set of nodes
int genders_testquery(genders_t handle, const char *node, const char *query);
DESCRIPTION¶genders_testquery() tests if the node pointed to by node meets the conditions specified in the query. If node is NULL, the current node is tested. Queries are based on the union, intersection, difference, or complement of genders attributes and values. The query is passed as a string through the query parameter. The set operation union is represented by two pipe symbols ('||'), intersection by two ampersand symbols ('&&'), difference by two minus symbols ('--'), and complement by a tilde ('~'). Set operations are performed left to right. Parentheses may be used to change the order of operations. A list of query examples are listed below. A NULL query retrieves all nodes from the genders database.
EXAMPLES¶The following are example queries that can be passed to genders_testquery().
Test if a node contains the mgmt or login attribute: "mgmt||login"
Test if a node is not a login node: "all--login"
Test if a node is both a login node and ntp server: "login&&ntpserv"
Test if a node is not a mgmt or login node: "~(mgmt||login)"
RETURN VALUES¶If the node as met the conditions of the query, 1 is returned. 0 is returned if the node does not meet the conditions of the query. On error, -1 is returned, and an error code is returned in handle. The error code can be retrieved via genders_errnum(3) , and a description of the error code can be retrieved via genders_strerror(3). Error codes are defined in genders.h.
- The handle parameter is NULL. The genders handle must be created with genders_handle_create(3).
- genders_load_data(3) has not been called to load genders data.
- An incorrect parameter has been passed in.
- There is a syntax error in the query.
- malloc(3) has failed internally, system is out of memory.
- handle has an incorrect magic number. handle does not point to a genders handle or handle has been destroyed by genders_handle_destroy(3).
- An internal system error has occurred.
SEE ALSO¶libgenders(3), genders_handle_create(3), genders_load_data(3), genders_errnum(3), genders_strerror(3)