POSIX_TRACE_START(P) POSIX Programmer's Manual POSIX_TRACE_START(P)NAME
posix_trace_start, posix_trace_stop - trace start and stop (TRACING)
SYNOPSIS
#include <trace.h>
int posix_trace_start(trace_id_t trid);
int posix_trace_stop (trace_id_t trid);
DESCRIPTION
The posix_trace_start() and posix_trace_stop() functions, respectively,
shall start and stop the trace stream identified by the argument trid.
The effect of calling the posix_trace_start() function shall be
recorded in the trace stream as the POSIX_TRACE_START system trace
event and the status of the trace stream shall become POSIX_TRACE_RUN‐
NING. If the trace stream is in progress when this function is called,
the POSIX_TRACE_START system trace event shall not be recorded and the
trace stream shall continue to run. If the trace stream is full, the
POSIX_TRACE_START system trace event shall not be recorded and the sta‐
tus of the trace stream shall not be changed.
The effect of calling the posix_trace_stop() function shall be recorded
in the trace stream as the POSIX_TRACE_STOP system trace event and the
status of the trace stream shall become POSIX_TRACE_SUSPENDED. If the
trace stream is suspended when this function is called, the
POSIX_TRACE_STOP system trace event shall not be recorded and the trace
stream shall remain suspended. If the trace stream is full, the
POSIX_TRACE_STOP system trace event shall not be recorded and the sta‐
tus of the trace stream shall not be changed.
RETURN VALUE
Upon successful completion, these functions shall return a value of
zero. Otherwise, they shall return the corresponding error number.
ERRORS
These functions shall fail if:
EINVAL The value of the argument trid does not correspond to an active
trace stream and thus no trace stream was started or stopped.
EINTR The operation was interrupted by a signal and thus the trace
stream was not necessarily started or stopped.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOposix_trace_create() , 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 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_START(P)
