POOL_GET_BINDING(3POOL) Pool Configuration Manipulation Library Functions


NAME


pool_get_binding, pool_set_binding, pool_get_resource_binding - set and
query process to resource pool bindings

SYNOPSIS


cc [ flag... ] file... -lpool [ library... ]
#include <pool.h>

char *pool_get_binding(pid_t pid);


int pool_set_binding(const char *pool, idtype_t idtype,
id_t id);


char *pool_get_resource_binding(const char *type, pid_t pid);


DESCRIPTION


The pool_get_binding() function returns the name of the pool on the
running system that contains the set of resources to which the given
process is bound. If no such pool exists on the system or the search
returns more than one pool (since the set of resources is referred to by
more than one pool), NULL is returned and the pool error value is set to
POE_INVALID_SEARCH.


It is possible that one of the resources to which the given process is
bound is not associated with a pool. This could occur if a processor set
was created with one of the pset_() functions and the process was then
bound to that set. It could also occur if the process was bound to a
resource set not currently associated with a pool, since resources can
exist that are not associated with a pool.


The pool_set_binding() function binds the processes matching idtype and
id to the resources associated with pool on the running system. This
function requires the privilege required by the underlying resource types
referenced by the pool; generally, this requirement is equivalent to
requiring superuser privilege.


The idtype parameter can be of the following types:

P_PID
The id parameter is a pid.


P_TASKID
The id parameter is a taskid.


P_PROJID
The id parameter is a project ID. All currently running
processes belonging to the given project will be bound to the
pool's resources.


The pool_get_resource_binding() function returns the name of the resource
of the supplied type to which the supplied process is bound.


The application must explicity free the memory allocated for the return
values for pool_get_binding() and pool_get_resource_binding().

RETURN VALUES


Upon successful completion, pool_get_binding() returns the name of the
pool to which the process is bound. Otherwise it returns NULL and
pool_error(3POOL) returns the pool-specific error value.


Upon successful completion, pool_set_binding() returns PO_SUCCESS.
Otherwise, it returns PO_FAIL and pool_error() returns the pool-specific
error value.


Upon successful completion, pool_get_resource_binding() returns the name
of the resource of the specified type to which the process is bound.
Otherwise it returns NULL and pool_error() returns the pool-specific
error value.

ERRORS


The pool_get_binding() function will fail if:

POE_INVALID_CONF
The configuration is invalid.


POE_INVALID_SEARCH
It is not possible to determine the binding for
this target due to the overlapping nature of the
pools configured for this system, or the pool could
not be located.


POE_SYSTEM
A system error has occurred. Check the system error
code for more details.


The pool_set_binding() function will fail if:

POE_INVALID_SEARCH
The pool could not be found.


POE_INVALID_CONF
The configuration is invalid.


POE_SYSTEM
A system error has occurred. Check the system error
code for more details.


The pool_get_resource_binding() function will fail if:

POE_INVALID_CONF
The configuration is invalid.


POE_INVALID_SEARCH
The target is not bound to a resource of the
specified type.


POE_SYSTEM
A system error has occurred. Check the system error
code for more details.


EXAMPLES


Example 1: Bind the current process to the pool named "target".



#include <sys/types.h>
#include <pool.h>
#include <unistd.h>

...

id_t pid = getpid();

...

if (pool_set_binding("target", P_PID, pid) == PO_FAIL) {
(void) fprintf(stderr, "pool binding failed (\%d)\B{}n",
pool_error());


ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Unstable |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+

SEE ALSO


libpool(3LIB), pool_error(3POOL), attributes(5)


March 27, 2007 POOL_GET_BINDING(3POOL)