POSIX_TRACE_CLOSE(3P)					     POSIX Programmer's Manual					     POSIX_TRACE_CLOSE(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       posix_trace_close, posix_trace_open, posix_trace_rewind - trace log management (TRACING)

SYNOPSIS

       #include <trace.h>

       int posix_trace_close(trace_id_t trid);
       int posix_trace_open(int file_desc, trace_id_t *trid);
       int posix_trace_rewind(trace_id_t trid);

DESCRIPTION

       The posix_trace_close() function shall deallocate the trace log identifier indicated by trid, and all of its associated resources. If there
       is no valid trace log pointed to by the trid, this function shall fail.

       The  posix_trace_open()	function shall allocate the necessary resources and establish the connection between a trace log identified by the
       file_desc argument and a trace stream identifier identified by the object pointed to by the trid argument. The file_desc argument should be
       a  valid  open  file  descriptor that corresponds to a trace log. The file_desc argument shall be open for reading. The current trace event
       timestamp, which specifies the timestamp of the trace event that will be read by the next call to posix_trace_getnext_event(), shall be set
       to the timestamp of the oldest trace event recorded in the trace log identified by trid.

       The  posix_trace_open()	function  shall return a trace stream identifier in the variable pointed to by the trid argument, that may only be
       used by the following functions:

				    posix_trace_close() 		      posix_trace_get_attr()
				    posix_trace_eventid_equal() 	      posix_trace_get_status()
				    posix_trace_eventid_get_name()	      posix_trace_getnext_event()
				    posix_trace_eventtypelist_getnext_id()    posix_trace_rewind()
				    posix_trace_eventtypelist_rewind()

       In particular, notice that the operations normally used by a trace controller process, such as posix_trace_start(), posix_trace_stop(),	or
       posix_trace_shutdown(), cannot be invoked using the trace stream identifier returned by the posix_trace_open() function.

       The posix_trace_rewind() function shall reset the current trace event timestamp, which specifies the timestamp of the trace event that will
       be read by the next call to posix_trace_getnext_event(), to the timestamp of the oldest trace event recorded in the trace log identified by
       trid.

RETURN VALUE

       Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding error number.

       If successful, the posix_trace_open() function stores the trace stream identifier value in the object pointed to by trid.

ERRORS

       The posix_trace_open() function shall fail if:

       EINTR  The operation was interrupted by a signal and thus no trace log was opened.

       EINVAL The object pointed to by file_desc does not correspond to a valid trace log.

       The posix_trace_close() and posix_trace_rewind() functions may fail if:

       EINVAL The object pointed to by trid does not correspond to a valid trace log.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       posix_trace_get_attr(),	posix_trace_get_filter(),  posix_trace_getnext_event(),  the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
       <trace.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003						     POSIX_TRACE_CLOSE(3P)