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Get a handle to an entity
#include <ha/ham.h>
ham_entity_t *ham_entity_handle( int nd,
const char *ename,
unsigned flags );
ham_entity_t *ham_entity_handle_node( const char *nodename,
const char *ename,
unsigned flags );
libham
The ham_entity_handle() function returns a handle
to an entity (ename).
The handle can then be
passed to other functions that expect a handle to an entity (such as ham_condition() or
ham_entity_handle_free()).
The handle returned is opaque — its contents are internal to the library.
If a node (nd) is specified, the handle is to an
entity/condition/action combination that refers to a process
on that remote node.
The ham_entity_handle_node() function is used when a
nodename is used to specify a remote HAM instead of a node
identifier (nd).
There are no flags defined at this time.
A valid ham_entity_t or NULL if an error
occurred (errno is set).
- EINVAL
- The name given in ename is invalid (e.g. it
contains the “/” character) or is NULL.
- ENAMETOOLONG
- The name given (in ename) is too long, i.e.
it exceeds _POSIX_PATH_MAX (defined in <limits.h>).
Note that the combined length of an entity/condition/action
name is also limited by _POSIX_PATH_MAX.
- ENOENT
- There's no entity by this name defined in the current context
of the HAM.
- ENOMEM
- Not enough memory to create a new handle.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
A call to ham_entity_handle() and a subsequent
use of the handle returned in a call such as
ham_condition() are completely
asynchronous. Therefore, a valid
action/condition/entity may no longer exist when the handle
is used at a later time.
In such an event, the ham_condition*() functions
will return an error (ENOENT) that the action in the condition
doesn't exist in the given entity.
ham_action_handle(),
ham_action_handle_free(),
ham_condition(),
ham_condition_handle(),
ham_condition_handle_free(),
ham_condition_remove(),
ham_entity_handle_free()
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