установить новый контекст LOGIMPORT (establish a new LOGIMPORT context)
Имя (Name)
pmiStart - establish a new LOGIMPORT context
Синопсис C (C Synopsis)
#include <pcp/pmapi.h>
#include <pcp/import.h>
int pmiStart(const char *archive, int inherit);
cc ... -lpcp_import -lpcp
Синопсис PERL (PERL synopsis)
use PCP::LogImport;
pmiStart($archive, $inherit);
Описание (Description)
As part of the Performance Co-Pilot Log Import API (see
LOGIMPORT(3)), pmiStart creates a new context. Each context
maintains the following state and metadata:
• The base name (archive) for the physical files that
constitute the output PCP archive.
• The source hostname for the data that will be written to the
PCP archive. Defaults to the hostname of the localhost, but
can be set using pmiSetHostname(3).
• The source timezone for the PCP archive. Defaults to the
timezone of the localhost, but can be set using
pmiSetTimezone(3).
• Metrics and instance domains, as defined by pmiAddMetric(3).
• Instances for each instance domain, as defined by
pmiAddInstance(3).
• Handles as defined by pmiGetHandle(3). Each handle is a
metric-instance pair, and each metric-instance pair may have
an associated value in each record written to the output PCP
archive.
• An optional set of data values for one or more metric-instance
pairs (ready for the next record to be written to the output
PCP archive) as defined by calls to pmPutValue(3) or
pmPutValuehandle(3).
If inherit is true, then the new context will inherit any and all
metadata (metrics, instance domains, instances and handles) from
the current context, otherwise the new context is created with no
metadata. The basename for the output PCP archive, the source
hostname, the source timezone and any data values from the
current context are not inherited. If this is the first call to
pmiStart the metadata will be empty independent of the value of
inherit.
Since no physical files for the output PCP archive will be
created until the first call to pmiWrite(3) or pmiPutRecord(3),
archive could be NULL to create a convenience context that is
populated with metadata to be inherited by subsequent contexts.
The return value is a context identifier that could be used in a
subsequent call to pmUseContext(3) and the new context becomes
the current context which persists for all subsequent calls up to
either another pmiStart call or a call to pmiUseContext(3) or a
call to pmiEnd(3).
Диагностика (Diagnostic)
It is an error if the physical files archive.0 and/or
archive.index and/or archive.meta already exist, but this is not
discovered until the first attempt is made to output some data by
calling pmiWrite(3) or pmiPutRecord(3), so pmiStart always
returns a positive context identifier.
Смотри также (See also)
LOGIMPORT(3), pmiAddInstance(3), pmiAddMetric(3), pmiEnd(3),
pmiErrStr(3), pmiGetHandle(3), pmiPutResult(3), pmiPutValue(3),
pmiPutValueHandle(3), pmiPutText(3), pmiPutLabel(3),
pmiSetHostname(3), pmiSetTimezone(3), pmiUseContext(3) and
pmiWrite(3).
