posix_trace_attr_getlogsize

       posix_trace_attr_getmaxsystemeventsize,           posix_trace_attr_get-
       maxusereventsize, posix_trace_attr_getstreamsize, posix_trace_attr_set-
       logsize,  posix_trace_attr_setmaxdatasize,  posix_trace_attr_setstream-
       size - retrieve and set trace stream size attributes (TRACING)

SYNOPSIS
       #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);


DESCRIPTION
       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 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 param-
       eter 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  event-
       size 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.

RETURN VALUE
       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  maxi-
       mum  memory  size  to  store  a single system trace event in the object

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


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       posix_trace_attr_init() , posix_trace_create() , posix_trace_event()  ,
       posix_trace_get_attr()    ,    the    Base    Definitions   volume   of
       IEEE Std 1003.1-2001, <sys/types.h>, <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_ATTR_GETLOGSIZE(P)