pmnumberstr_r(3) [centos man page]
PMNUMBERSTR(3) Library Functions Manual PMNUMBERSTR(3) NAME
pmNumberStr, pmNumberStr_r - fixed width output format for numbers C SYNOPSIS
#include <pcp/pmapi.h> const char *pmNumberStr(double value); char *pmNumberStr_r(double value, char *buf, int buflen); cc ... -lpcp DESCRIPTION
pmNumberStr returns the address of a 8-byte buffer that holds a null-byte terminated representation of value suitable for output with fixed width fields. The pmNumberStr_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 8 bytes. The value is scaled using multipliers in powers of ``one thousand'' (the decimal ``kilo'') and has a bias that provides greater precision for positive numbers as opposed to negative numbers. The format depends on the sign and magnitude of value as follows (d represents a decimal digit): +----------------------------------+---------+ | value range | format | +----------------------------------+---------+ | > 999995000000000 | inf? | |999995000000000 - 999995000000 | ddd.ddT | | 999995000000 - 999995000 | ddd.ddG | | 999995000 - 999995 | ddd.ddM | | 999995 - 999.995 | ddd.ddK | | 999.995 - 0.005 | ddd.dd | | 0.005 - -0.005 | 0.00 | | -0.005 - -99.95 | -dd.dd | | -99.995 - -99995 | -dd.ddK | | -99995 - -99995000 | -dd.ddM | | -99995000 - -99995000000 | -dd.ddG | | -99995000000 - -99995000000000 | -dd.ddT | | < -99995000000000 | -inf? | +----------------------------------+---------+ At the boundary points of the ranges, the chosen format will retain the maximum number of significant digits. NOTES
pmNumberStr returns a pointer to a static buffer and hence is not thread-safe. Multi-threaded applications should use pmNumberStr_r instead. SEE ALSO
printf(3) Performance Co-Pilot PCP PMNUMBERSTR(3)
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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)