Originální popis anglicky:
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)
Návod, kniha: POSIX Programmer's Manual
#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.
None.
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>
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
.
