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LEARN ABOUT CENTOS
pmindomstr_r
PMINDOMSTR(3) Library Functions Manual PMINDOMSTR(3)
NAME
pmInDomStr, pmInDomStr_r - convert a performance metric instance domain identifier into a string
C SYNOPSIS
#include <pcp/pmapi.h>
const char *pmInDomStr(pmInDom indom);
char *pmInDomStr_r(pmInDom indom, char *buf, int buflen);
cc ... -lpcp
DESCRIPTION
For use in error and diagnostic messages, pmInDomStr return a 'human readable' version of the specified instance domain identifier. The
pmInDomStr_r function does the same, but stores the result in a user-supplied buffer buf of length buflen, which should have room for at
least 20 bytes.
The value for the instance domain indom is typically extracted from a pmDesc structure, following a call to pmLookupDesc(3) for a particu-
lar performance metric.
Internally, an instance domain identifier is encoded as follows;
typedef struct {
int pad:2;
unsigned int domain:8; /* the administrative PMD */
unsigned int serial:22; /* unique within PMD */
} __pmInDom_int;
pmInDomStr returns a string with each of the domain and serial subfields appearing as decimal numbers, separated by periods.
The string value returned by pmInDomStr is held in a single static buffer, so the returned value is only valid until the next call to pmIn-
DomStr.
NOTES
pmInDomStr returns a pointer to a static buffer and hence is not thread-safe. Multi-threaded applications should use pmInDomStr_r instead.
PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the
file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura-
tion file, as described in pcp.conf(5). Values for these variables may be obtained programmatically using the pmGetConfig(3) function.
SEE ALSO
PMAPI(3), pmGetConfig(3), pmIDStr(3), pmLookupDesc(3), pcp.conf(5) and pcp.env(5).
Performance Co-Pilot PCP PMINDOMSTR(3)