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POSIX_TRACE_ATTR_GETLOGSIZE(P) POSIX_TRACE_ATTR_GETLOGSIZE(P)
NAME
posix_trace_attr_getlogsize, posix_trace_attr_getmaxdatasize, posix_trace_attr_get-
maxsystemeventsize, posix_trace_attr_getmaxusereventsize, posix_trace_attr_get-
streamsize, posix_trace_attr_setlogsize, posix_trace_attr_setmaxdatasize,
posix_trace_attr_setstreamsize - 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 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 maxdata-
size 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 max-
imum 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. Other-
wise, 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 suc-
cessful.
The posix_trace_attr_getstreamsize() function stores the maximum trace stream
allowed size in the object pointed to by streamsize, if successful.
ERRORS
These functions may fail if:
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 .
POSIX 2003 POSIX_TRACE_ATTR_GETLOGSIZE(P)
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Under GNU General Public License
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