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

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 argu-
       ment 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_get-
       next_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 Technology  --  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003			     POSIX_TRACE_CLOSE(P)
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