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cpc_access

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

NAME

       cpc_access - test access CPU performance counters

SYNOPSIS

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

       int cpc_access(void);

DESCRIPTION

       Access  to  CPU	performance  counters  is  possible only on systems where the appropriate hardware exists and is correctly configured. The
       cpc_access() function must be used to determine if the hardware exists and is accessible on the platform before any of the interfaces  that
       use the counters are invoked.

       When  the hardware is available, access to the per-process counters is always allowed to the process itself, and allowed to other processes
       mediated using the existing security mechanisms of /proc.

RETURN VALUES

       Upon successful completion, cpc_access() returns 0.  Otherwise, it returns -1 and sets errno to indicate the error.

       By default, two common errno values are decoded and cause the library to  print	an  error  message  using  its	reporting  mechanism.  See
       cpc_seterrfn(3CPC) for a description of how this behavior can be modified.

ERRORS

       The cpc_access() function will fail if:

       EAGAIN	 Another process may be sampling system-wide CPU statistics.

       ENOSYS	 CPU  performance  counters are inaccessible on this machine. This error can occur when the machine supports CPU performance coun-
		 ters, but some software components are missing. Check to see that all	CPU  Performance  Counter  packages  have  been  correctly
		 installed.

ATTRIBUTES

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

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

SEE ALSO

       cpc(3CPC), cpc_open(3CPC), cpc_seterrfn(3CPC), libcpc(3LIB), proc(4), attributes(5)

NOTES

       The cpc_access() function exists for binary compatibility only. Source containing this function will not compile. This function is obsolete
       and might be removed in a future release. Applications should use cpc_open(3CPC) instead.

SunOS 5.11							    28 Mar 2005 						  cpc_access(3CPC)

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