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posix_trace_get_attr(3p) — Linux manual page

PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT 

POSIX_TR...GET_ATTR(3P) POSIX Programmer's ManualPOSIX_TR...GET_ATTR(3P)

PROLOG         top

       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         top

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

SYNOPSIS         top

       #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         top

       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         top

       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         top

       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         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

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

SEE ALSO         top

       posix_trace_attr_destroy(3p), posix_trace_close(3p),
       posix_trace_create(3p)

       The Base Definitions volume of POSIX.1‐2017, trace.h(0p)

COPYRIGHT         top

       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 .

IEEE/The Open Group               2017           POSIX_TR...GET_ATTR(3P)

Pages that refer to this page: trace.h(0p),  posix_trace_attr_destroy(3p),  posix_trace_attr_getclockres(3p),  posix_trace_attr_getinherited(3p),  posix_trace_attr_getlogsize(3p),  posix_trace_clear(3p),  posix_trace_close(3p),  posix_trace_create(3p),  posix_trace_get_status(3p)

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