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POSIX_TRACE_ATTR_GETLOGSIZE(3P) Programmer's ManualTRACE_ATTR_GETLOGSIZE(3P)
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.
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)
#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);
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.
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.
These functions may fail if:
EINVAL The value specified by one of the arguments is invalid.
The following sections are informative.
None.
None.
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_destroy(3p), posix_trace_create(3p),
posix_trace_event(3p), posix_trace_get_attr(3p)
The Base Definitions volume of POSIX.1‐2008, sys_types.h(0p),
trace.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/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 2013 POSIX_TRACE_ATTR_GETLOGSIZE(3P)
Pages that refer to this page: trace.h(0p), posix_trace_attr_getstreamsize(3p), posix_trace_attr_setlogsize(3p), posix_trace_attr_setstreamsize(3p)