12-17-2019
You cannot examine events that occurred in the past unless you log your events.
You should add custom logging code to begin troubleshooting such problems.
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LEARN ABOUT FREEBSD
pmc_flush_logfile
PMC_CONFIGURE_LOGFILE(3) BSD Library Functions Manual PMC_CONFIGURE_LOGFILE(3)
NAME
pmc_configure_logfile, pmc_flush_logfile, pmc_writelog, pmc_close_logfile -- log file management
LIBRARY
Performance Counters Library (libpmc, -lpmc)
SYNOPSIS
#include <pmc.h>
int
pmc_configure_logfile(int fd);
int
pmc_flush_logfile(void);
int
pmc_writelog(uint32_t userdata);
int
pmc_close_logfile(void);
DESCRIPTION
The functions manage logging of hwpmc(4) events.
Function pmc_configure_logfile() is used to turn on and turn off logging. If argument fd is a valid file handle returned by a prior call to
open(2) or socket(2) then performance events will be logged to the file corresponding to the specified handle. If the value of argument fd
is -1 then logging will be stopped after any pending data is flushed.
Function pmc_flush_logfile() will force all log data queued inside the hwpmc(4) driver to be written out.
Function pmc_writelog() will append a log entry containing the value of argument userdata to the log file.
Function pmc_close_logfile() will flush all pending log data and close hwpmc(4)'s side of the stream.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
A call to pmc_configure_logfile() may fail with the following errors:
[EAGAIN] The hwpmc(4) driver was not able to create a helper process due to system limits being reached.
[EBUSY] Function pmc_configure_logfile() was called with a log file already configured.
[EINVAL] Function pmc_configure_logfile() was called with an argument of -1 without a log file being previously configured.
[ENOMEM] The system encountered a memory shortage when servicing this request.
A call to pmc_flush_logfile() may fail with the following errors:
[EINVAL] Function pmc_flush_logfile() was called without a log file being previously configured.
A call to pmc_writelog() may fail with the following errors:
[EINVAL] Function pmc_writelog() was called without a log file being previously configured.
[ENOMEM] The system encountered a memory shortage when servicing this request.
SEE ALSO
pmc(3), hwpmc(4)
BSD
November 24, 2007 BSD