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

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

NAME
       posix_trace_get_attr,  posix_trace_get_status  -	 retrieve  the	 trace
       attributes or trace status (TRACING)

SYNOPSIS
       #include <trace.h>

       int posix_trace_get_attr(trace_id_t trid, trace_attr_t *attr);
       int posix_trace_get_status(trace_id_t trid,
	      struct posix_trace_status_info *statusinfo);

DESCRIPTION
       The  posix_trace_get_attr()  function  shall copy the attributes of the
       active trace stream identified by trid into the object  pointed	to  by
       the  attr  argument.    If  the Trace Log option is supported, trid may
       represent a pre-recorded trace log.

       The posix_trace_get_status() function shall return,  in	the  structure
       pointed to by the statusinfo argument, the current trace status for the
       trace stream identified by  the	trid  argument.	 These	status	values
       returned	 in  the  structure  pointed  to by statusinfo shall have been
       appropriately read to ensure that the returned values  are  consistent.
       If  the Trace Log option is supported and the trid argument refers to a
       pre-recorded trace stream, the status shall be the status of  the  com‐
       pleted trace stream.

       Each  time  the	posix_trace_get_status() function is used, the overrun
       status of the trace stream shall	 be  reset  to	POSIX_TRACE_NO_OVERRUN
       immediately  after the call completes.  If the Trace Log option is sup‐
       ported, the posix_trace_get_status() function shall behave the same  as
       when the option is not supported except for the following differences:

	* If  the  trid	 argument refers to a trace stream with log, each time
	  the posix_trace_get_status() function is used, the log overrun  sta‐
	  tus of the trace stream shall be reset to POSIX_TRACE_NO_OVERRUN and
	  the flush_error status shall be reset to zero immediately after  the
	  call completes.

	* If the trid argument refers to a pre-recorded trace stream, the sta‐
	  tus returned shall be the status of the completed trace  stream  and
	  the status values of the trace stream shall not be reset.

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

       The posix_trace_get_attr() function stores the trace attributes in  the
       object pointed to by attr, if successful.

       The  posix_trace_get_status()  function	stores the trace status in the
       object pointed to by statusinfo, if successful.

ERRORS
       These functions shall fail if:

       EINVAL The trace stream argument trid does not correspond  to  a	 valid
	      active trace stream or a valid trace log.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       posix_trace_attr_destroy(),  posix_trace_attr_init(),  posix_trace_cre‐
       ate(),	posix_trace_open(),   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 original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003	      POSIX_TRACE_GET_ATTR(3P)
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