CPC_OPEN(3CPC) CPU Performance Counters Library Functions CPC_OPEN(3CPC)


NAME


cpc_open, cpc_close - initialize the CPU Performance Counter library

SYNOPSIS


cc [ flag... ] file... -lcpc [ library... ]
#include <libcpc.h>

cpc_t *cpc_open(int vers);


int cpc_close(cpc_t *cpc);


DESCRIPTION


The cpc_open() function initializes libcpc(3LIB) and returns an
identifier that must be used as the cpc argument in subsequent libcpc
function calls. The cpc_open() function takes an interface version as an
argument and returns NULL if that version of the interface is
incompatible with the libcpc implementation present on the system.
Usually, the argument has the value of CPC_VER_CURRENT bound to the
application when it was compiled.


The cpc_close() function releases all resources associated with the cpc
argument. Any bound counters utilized by the process are unbound. All
entities of type cpc_set_t and cpc_buf_t are invalidated and destroyed.

RETURN VALUES


If the version requested is supported by the implementation, cpc_open()
returns a cpc_t handle for use in all subsequent libcpc operations. If
the implementation cannot support the version needed by the application,
cpc_open() returns NULL, indicating that the application at least needs
to be recompiled to operate correctly on the new platform and might
require further changes.


The cpc_close() function always returns 0.

ERRORS


These functions will fail if:

EINVAL
The version requested by the client is incompatible with the
implementation.


ATTRIBUTES


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


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+

SEE ALSO


libcpc(3LIB), attributes(5)


January 30, 2004 CPC_OPEN(3CPC)