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PMC_CONFIGURE_LOGFILE(3) FreeBSD Library Functions Manual 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) FreeBSD 14.1-RELEASE-p8 November 24, 2007 FreeBSD 14.1-RELEASE-p8