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posix_trace_get_attr(3) [linux man page]

POSIX_TRACE_GET_ATTR(P) 				     POSIX Programmer's Manual					   POSIX_TRACE_GET_ATTR(P)

NAME
posix_trace_get_attr, posix_trace_get_status - retrieve the trace attributes or trace status (TRACING) SYNOPSIS
#include <trace.h> int posix_trace_get_attr(trace_id_t trid, trace_attr_t *attr); int posix_trace_get_status(trace_id_t trid, struct posix_trace_status_info *statusinfo); DESCRIPTION
The posix_trace_get_attr() function shall copy the attributes of the active trace stream identified by trid into the object pointed to by the attr argument. If the Trace Log option is supported, trid may represent a pre-recorded trace log. The posix_trace_get_status() function shall return, in the structure pointed to by the statusinfo argument, the current trace status for the trace stream identified by the trid argument. These status values returned in the structure pointed to by statusinfo shall have been appropriately read to ensure that the returned values are consistent. If the Trace Log option is supported and the trid argument refers to a pre-recorded trace stream, the status shall be the status of the completed trace stream. Each time the posix_trace_get_status() function is used, the overrun status of the trace stream shall be reset to POSIX_TRACE_NO_OVERRUN immediately after the call completes. If the Trace Log option is supported, the posix_trace_get_status() function shall behave the same as when the option is not supported except for the following differences: * If the trid argument refers to a trace stream with log, each time the posix_trace_get_status() function is used, the log overrun status of the trace stream shall be reset to POSIX_TRACE_NO_OVERRUN and the flush_error status shall be reset to zero immediately after the call completes. * If the trid argument refers to a pre-recorded trace stream, the status returned shall be the status of the completed trace stream and the status values of the trace stream shall not be reset. RETURN VALUE
Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding error number. The posix_trace_get_attr() function stores the trace attributes in the object pointed to by attr, if successful. The posix_trace_get_status() function stores the trace status in the object pointed to by statusinfo, if successful. ERRORS
These functions shall fail if: EINVAL The trace stream argument trid does not correspond to a valid active trace stream or a valid trace log. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
posix_trace_attr_destroy() , posix_trace_attr_init() , posix_trace_create() , posix_trace_open() , the Base Definitions volume of IEEE Std 1003.1-2001, <trace.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- 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_GET_ATTR(P)

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POSIX_TRACE_CLOSE(P)					     POSIX Programmer's Manual					      POSIX_TRACE_CLOSE(P)

NAME
posix_trace_close, posix_trace_open, posix_trace_rewind - trace log management (TRACING) SYNOPSIS
#include <trace.h> int posix_trace_close(trace_id_t trid); int posix_trace_open(int file_desc, trace_id_t *trid); int posix_trace_rewind(trace_id_t trid); DESCRIPTION
The posix_trace_close() function shall deallocate the trace log identifier indicated by trid, and all of its associated resources. If there is no valid trace log pointed to by the trid, this function shall fail. The posix_trace_open() function shall allocate the necessary resources and establish the connection between a trace log identified by the file_desc argument and a trace stream identifier identified by the object pointed to by the trid argument. The file_desc argument should be a valid open file descriptor that corresponds to a trace log. The file_desc argument shall be open for reading. The current trace event timestamp, which specifies the timestamp of the trace event that will be read by the next call to posix_trace_getnext_event(), shall be set to the timestamp of the oldest trace event recorded in the trace log identified by trid. The posix_trace_open() function shall return a trace stream identifier in the variable pointed to by the trid argument, that may only be used by the following functions: posix_trace_close() posix_trace_get_attr() posix_trace_eventid_equal() posix_trace_get_status() posix_trace_eventid_get_name() posix_trace_getnext_event() posix_trace_eventtypelist_getnext_id() posix_trace_rewind() posix_trace_eventtypelist_rewind() In particular, notice that the operations normally used by a trace controller process, such as posix_trace_start(), posix_trace_stop(), or posix_trace_shutdown(), cannot be invoked using the trace stream identifier returned by the posix_trace_open() function. The posix_trace_rewind() function shall reset the current trace event timestamp, which specifies the timestamp of the trace event that will be read by the next call to posix_trace_getnext_event(), to the timestamp of the oldest trace event recorded in the trace log identified by trid. RETURN VALUE
Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding error number. If successful, the posix_trace_open() function stores the trace stream identifier value in the object pointed to by trid. ERRORS
The posix_trace_open() function shall fail if: EINTR The operation was interrupted by a signal and thus no trace log was opened. EINVAL The object pointed to by file_desc does not correspond to a valid trace log. The posix_trace_close() and posix_trace_rewind() functions may fail if: EINVAL The object pointed to by trid does not correspond to a valid trace log. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
posix_trace_get_attr() , posix_trace_get_filter() , posix_trace_getnext_event() , the Base Definitions volume of IEEE Std 1003.1-2001, <trace.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- 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_CLOSE(P)
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