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 completed 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 supported, 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 status 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 status 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

       The  posix_trace_get_attr()  and  posix_trace_get_status()  functions  may be removed in a
       future version.

SEE ALSO

       posix_trace_attr_destroy(), posix_trace_close(), posix_trace_create()

       The Base Definitions volume of POSIX.1‐2017, <trace.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .