This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       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_TRACE_ATTR_GETLOGSIZE(3POSIX)

       The  posix_trace_attr_getlogsize()  function  shall  copy  the  log size, in bytes, from the log-max-size
       attribute of the attributes object pointed to by the attr argument into the variable pointed  to  by  the
       logsize argument. This log size is the maximum total of bytes that shall be allocated for system and user
       trace  events  in  the  trace  log.  The  default value for the log-max-size attribute is implementation-
       defined.

       The posix_trace_attr_setlogsize() function shall set the maximum allowed size, in bytes, in the  log-max-size attribute of the attributes object pointed to by the attr argument, using the size value supplied by
       the logsize argument.

       The  trace  log  size  shall  be  used  if  the  log-full-policy  attribute is set to POSIX_TRACE_LOOP or
       POSIX_TRACE_UNTIL_FULL. If the log-full-policy attribute is set to POSIX_TRACE_APPEND, the implementation
       shall ignore the log-max-size attribute.

       The posix_trace_attr_getmaxdatasize() function shall copy the maximum user  trace  event  data  size,  in
       bytes, from the max-data-size attribute of the attributes object pointed to by the attr argument into the
       variable  pointed  to  by  the maxdatasize argument. The default value for the max-data-size attribute is
       implementation-defined.

       The posix_trace_attr_getmaxsystemeventsize() function shall calculate the maximum memory size, in  bytes,
       required  to  store a single system trace event. This value is calculated for the trace stream attributes
       object pointed to by the attr argument and is returned in  the  variable  pointed  to  by  the  eventsize
       argument.

       The values returned as the maximum memory sizes of the user and system trace events shall be such that if
       the  sum  of the maximum memory sizes of a set of the trace events that may be recorded in a trace stream
       is less than or equal to the stream-min-size attribute of that trace  stream,  the  system  provides  the
       necessary resources for recording all those trace events, without loss.

       The  posix_trace_attr_getmaxusereventsize()  function  shall calculate the maximum memory size, in bytes,
       required to store a single user trace event generated by a call to posix_trace_event()  with  a  data_len
       parameter  equal  to  the  data_len  value specified in this call. This value is calculated for the trace
       stream attributes object pointed to by the attr argument and is returned in the variable  pointed  to  by
       the eventsize argument.

       The  posix_trace_attr_getstreamsize() function shall copy the stream size, in bytes, from the stream-min-size attribute of the attributes object pointed to by the attr argument into the variable pointed  to  by
       the streamsize argument.

       This  stream size is the current total memory size reserved for system and user trace events in the trace
       stream. The default value for the stream-min-size attribute is implementation-defined.  The  stream  size
       refers  to  memory  used  to  store  trace event records. Other stream data (for example, trace attribute
       values) shall not be included in this size.

       The posix_trace_attr_setmaxdatasize() function shall set the maximum allowed size, in bytes, in the  max-data-size  attribute  of  the  attributes  object  pointed  to by the attr argument, using the size value
       supplied by the maxdatasize argument. This maximum size is the maximum allowed size  for  the  user  data
       argument  which  may  be  passed to posix_trace_event().  The implementation shall be allowed to truncate
       data passed to trace_user_event which is longer than maxdatasize.

       The posix_trace_attr_setstreamsize() function shall set the  minimum  allowed  size,  in  bytes,  in  the
       stream-min-size  attribute of the attributes object pointed to by the attr argument, using the size value
       supplied by the streamsize argument.

       These functions may fail if:

       EINVAL The value specified by one of the arguments is invalid.

       Thefollowingsectionsareinformative.

       None.

       The following functions:

              posix_trace_attr_getlogsize()
              posix_trace_attr_getmaxdatasize()
              posix_trace_attr_getmaxsystemeventsize()
              posix_trace_attr_getmaxusereventsize()
              posix_trace_attr_getstreamsize()
              posix_trace_attr_setlogsize()
              posix_trace_attr_setmaxdatasize()
              posix_trace_attr_setstreamsize()

       may be removed in a future version.

       posix_trace_attr_getlogsize, posix_trace_attr_getmaxdatasize, posix_trace_attr_getmaxsystemeventsize,
       posix_trace_attr_getmaxusereventsize, posix_trace_attr_getstreamsize, posix_trace_attr_setlogsize,
       posix_trace_attr_setmaxdatasize, posix_trace_attr_setstreamsize — retrieve and set trace stream size
       attributes (TRACING)

       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.

       None.

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

       The  posix_trace_attr_getlogsize()  function  stores  the  maximum  trace  log allowed size in the object
       pointed to by logsize, if successful.

       The posix_trace_attr_getmaxdatasize() function stores the maximum trace event record memory size  in  the
       object pointed to by maxdatasize, if successful.

       The  posix_trace_attr_getmaxsystemeventsize()  function  stores the maximum memory size to store a single
       system trace event in the object pointed to by eventsize, if successful.

       The posix_trace_attr_getmaxusereventsize() function stores the maximum memory size to store a single user
       trace event in the object pointed to by eventsize, if successful.

       The posix_trace_attr_getstreamsize() function stores the maximum trace stream allowed size in the  object
       pointed to by streamsize, if successful.

posix_trace_attr_destroy(), posix_trace_create(), posix_trace_event(), posix_trace_get_attr()

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

       #include <sys/types.h>
       #include <trace.h>

       int posix_trace_attr_getlogsize(const trace_attr_t *restrict attr,
           size_t *restrict logsize);
       int posix_trace_attr_getmaxdatasize(const trace_attr_t *restrict attr,
           size_t *restrict maxdatasize);
       int posix_trace_attr_getmaxsystemeventsize(
           const trace_attr_t *restrict attr,
           size_t *restrict eventsize);
       int posix_trace_attr_getmaxusereventsize(
           const trace_attr_t *restrict attr,
           size_t data_len, size_t *restrict eventsize);
       int posix_trace_attr_getstreamsize(const trace_attr_t *restrict attr,
           size_t *restrict streamsize);
       int posix_trace_attr_setlogsize(trace_attr_t *attr,
           size_t logsize);
       int posix_trace_attr_setmaxdatasize(trace_attr_t *attr,
           size_t maxdatasize);
       int posix_trace_attr_setstreamsize(trace_attr_t *attr,
           size_t streamsize);