cctools
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Enumerations | |
enum | catalog_update_flags_t { CATALOG_UPDATE_BACKGROUND =1, CATALOG_UPDATE_CONDITIONAL =2 } |
Catalog update control flags. More... | |
Functions | |
struct catalog_query * | catalog_query_create (const char *hosts, struct jx *filter_expr, time_t stoptime) |
Create a catalog query. More... | |
struct jx * | catalog_query_read (struct catalog_query *q, time_t stoptime) |
Read the next object from a query. More... | |
void | catalog_query_delete (struct catalog_query *q) |
Delete a completed query object. More... | |
int | catalog_query_send_update (const char *hosts, const char *text, catalog_update_flags_t flags) |
Send update text to the given hosts hosts is a comma delimited list of hosts, each of which can be host or host:port. More... | |
Query the global catalog server for server descriptions.
Catalog update control flags.
These control the behavior of catalog_query_send_update
Enumerator | |
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CATALOG_UPDATE_BACKGROUND | Send update via a background process if TCP is selected. |
CATALOG_UPDATE_CONDITIONAL | Fail if UDP is selected and update is too large to send. |
struct catalog_query* catalog_query_create | ( | const char * | hosts, |
struct jx * | filter_expr, | ||
time_t | stoptime | ||
) |
Create a catalog query.
Connects to a catalog server, issues a query, and waits for the results. The caller may specify a specific catalog host and port. If none is given, then the environment variables CATALOG_HOST and CATALOG_PORT will be consulted. If neither is set, the system will contact chirp.cse.nd.edu on port 9097.
hosts | A comma delimited list of catalog servers to query, or null for the default server. |
filter_expr | An optional expression to filter the results in JX syntax. A null pointer indicates no filter. |
stoptime | The absolute time at which to abort. |
struct jx* catalog_query_read | ( | struct catalog_query * | q, |
time_t | stoptime | ||
) |
Read the next object from a query.
Returns the next jx expressions from the issued query. The caller may use jx_lookup_string, jx_lookup_integer and related functions to manipulate the object, and then must call jx_delete when done.
q | A query created by catalog_query_create. |
stoptime | The absolute time at which to abort. |
void catalog_query_delete | ( | struct catalog_query * | q | ) |
Delete a completed query object.
q | The query to delete. |
int catalog_query_send_update | ( | const char * | hosts, |
const char * | text, | ||
catalog_update_flags_t | flags | ||
) |
Send update text to the given hosts hosts is a comma delimited list of hosts, each of which can be host or host:port.
hosts | A list of hosts to which to send updates |
text | String to send |
flags | Any combination of CATALOG_UPDATE |