On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-10 09:32 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
POSIX_TRACE_CREATE(P) POSIX_TRACE_CREATE(P)
NAME
posix_trace_create, posix_trace_create_withlog, posix_trace_flush,
posix_trace_shutdown - trace stream initialization, flush, and shutdown from a pro-
cess (TRACING)
SYNOPSIS
#include <sys/types.h>
#include <trace.h>
int posix_trace_create(pid_t pid,
const trace_attr_t *restrict attr,
trace_id_t *restrict trid);
int posix_trace_create_withlog(pid_t pid,
const trace_attr_t *restrict attr, int file_desc,
trace_id_t *restrict trid);
int posix_trace_flush(trace_id_t trid);
int posix_trace_shutdown(trace_id_t trid);
DESCRIPTION
The posix_trace_create() function shall create an active trace stream. It allocates
all the resources needed by the trace stream being created for tracing the process
specified by pid in accordance with the attr argument. The attr argument represents
the initial attributes of the trace stream and shall have been initialized by the
function posix_trace_attr_init() prior to the posix_trace_create() call. If the
argument attr is NULL, the default attributes shall be used. The attr attributes
object shall be manipulated through a set of functions described in the
posix_trace_attr family of functions. If the attributes of the object pointed to by
attr are modified later, the attributes of the trace stream shall not be affected.
The creation-time attribute of the newly created trace stream shall be set to the
value of the system clock, if the Timers option is not supported, or to the value
of the CLOCK_REALTIME clock, if the Timers option is supported.
The pid argument represents the target process to be traced. If the process exe-
cuting this function does not have appropriate privileges to trace the process
identified by pid, an error shall be returned. If the pid argument is zero, the
calling process shall be traced.
The posix_trace_create() function shall store the trace stream identifier of the
new trace stream in the object pointed to by the trid argument. This trace stream
identifier shall be used in subsequent calls to control tracing. The trid argument
may only be used by the following functions:
posix_trace_clear() posix_trace_getnext_event()
posix_trace_eventid_equal() posix_trace_shutdown()
posix_trace_eventid_get_name() posix_trace_start()
posix_trace_eventtypelist_getnext_id() posix_trace_stop()
posix_trace_eventtypelist_rewind() posix_trace_timedgetnext_event()
posix_trace_get_attr() posix_trace_trid_eventid_open()
posix_trace_get_status() posix_trace_trygetnext_event()
If the Trace Event Filter option is supported, the following additional functions
may use the trid argument:
posix_trace_get_filter() posix_trace_set_filter()
In particular, notice that the operations normally used by a trace analyzer
process, such as posix_trace_rewind() or posix_trace_close(), cannot be invoked
using the trace stream identifier returned by the posix_trace_create() function.
A trace stream shall be created in a suspended state. If the Trace Event Filter
option is supported, its trace event type filter shall be empty.
The posix_trace_create() function may be called multiple times from the same or
different processes, with the system-wide limit indicated by the runtime invariant
value {TRACE_SYS_MAX}, which has the minimum value {_POSIX_TRACE_SYS_MAX}.
The trace stream identifier returned by the posix_trace_create() function in the
argument pointed to by trid is valid only in the process that made the function
call. If it is used from another process, that is a child process, in functions
defined in IEEE Std 1003.1-2001, these functions shall return with the error [EIN-
VAL].
The posix_trace_create_withlog() function shall be equivalent to posix_trace_cre-
ate(), except that it associates a trace log with this stream. The file_desc argu-
ment shall be the file descriptor designating the trace log destination. The func-
tion shall fail if this file descriptor refers to a file with a file type that is
not compatible with the log policy associated with the trace log. The list of the
appropriate file types that are compatible with each log policy is implementation-
defined.
The posix_trace_create_withlog() function shall return in the parameter pointed to
by trid the trace stream identifier, which uniquely identifies the newly created
trace stream, and shall be used in subsequent calls to control tracing. The trid
argument may only be used by the following functions:
posix_trace_clear() posix_trace_getnext_event()
posix_trace_eventid_equal() posix_trace_shutdown()
posix_trace_eventid_get_name() posix_trace_start()
posix_trace_eventtypelist_getnext_id() posix_trace_stop()
posix_trace_eventtypelist_rewind() posix_trace_timedgetnext_event()
posix_trace_flush() posix_trace_trid_eventid_open()
posix_trace_get_attr() posix_trace_trygetnext_event()
posix_trace_get_status()
If the Trace Event Filter option is supported, the following additional functions
may use the trid argument:
posix_trace_get_filter() posix_trace_set_filter()
In particular, notice that the operations normally used by a trace analyzer pro-
cess, such as posix_trace_rewind() or posix_trace_close(), cannot be invoked using
the trace stream identifier returned by the posix_trace_create_withlog() function.
The posix_trace_flush() function shall initiate a flush operation which copies the
contents of the trace stream identified by the argument trid into the trace log
associated with the trace stream at the creation time. If no trace log has been
associated with the trace stream pointed to by trid, this function shall return an
error. The termination of the flush operation can be polled by the
posix_trace_get_status() function. During the flush operation, it shall be possible
to trace new trace events up to the point when the trace stream becomes full. After
flushing is completed, the space used by the flushed trace events shall be avail-
able for tracing new trace events.
If flushing the trace stream causes the resulting trace log to become full, the
trace log full policy shall be applied. If the trace log-full-policy attribute is
set, the following occurs:
POSIX_TRACE_UNTIL_FULL
The trace events that have not yet been flushed shall be discarded.
POSIX_TRACE_LOOP
The trace events that have not yet been flushed shall be written to the
beginning of the trace log, overwriting previous trace events stored there.
POSIX_TRACE_APPEND
The trace events that have not yet been flushed shall be appended to the
trace log.
The posix_trace_shutdown() function shall stop the tracing of trace events in the
trace stream identified by trid, as if posix_trace_stop() had been invoked. The
posix_trace_shutdown() function shall free all the resources associated with the
trace stream.
The posix_trace_shutdown() function shall not return until all the resources asso-
ciated with the trace stream have been freed. When the posix_trace_shutdown() func-
tion returns, the trid argument becomes an invalid trace stream identifier. A call
to this function shall unconditionally deallocate the resources regardless of
whether all trace events have been retrieved by the analyzer process. Any thread
blocked on one of the trace_getnext_event() functions (which specified this trid)
before this call is unblocked with the error [EINVAL].
If the process exits, invokes a member of the exec family of functions, or is ter-
minated, the trace streams that the process had created and that have not yet been
shut down, shall be automatically shut down as if an explicit call were made to the
posix_trace_shutdown() function.
For an active trace stream with log, when the posix_trace_shutdown() function is
called, all trace events that have not yet been flushed to the trace log shall be
flushed, as in the posix_trace_flush() function, and the trace log shall be closed.
When a trace log is closed, all the information that may be retrieved later from
the trace log through the trace interface shall have been written to the trace log.
This information includes the trace attributes, the list of trace event types (with
the mapping between trace event names and trace event type identifiers), and the
trace status.
In addition, unspecified information shall be written to the trace log to allow
detection of a valid trace log during the posix_trace_open() operation.
The posix_trace_shutdown() function shall not return until all trace events have
been flushed.
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_create() and posix_trace_create_withlog() functions store the
trace stream identifier value in the object pointed to by trid, if successful.
ERRORS
The posix_trace_create() and posix_trace_create_withlog() functions shall fail
if:
EAGAIN No more trace streams can be started now. {TRACE_SYS_MAX} has been exceeded.
EINTR The operation was interrupted by a signal. No trace stream was created.
EINVAL One or more of the trace parameters specified by the attr parameter is
invalid.
ENOMEM The implementation does not currently have sufficient memory to create the
trace stream with the specified parameters.
EPERM The caller does not have appropriate privilege to trace the process speci-
fied by pid.
ESRCH The pid argument does not refer to an existing process.
The posix_trace_create_withlog() function shall fail if:
EBADF The file_desc argument is not a valid file descriptor open for writing.
EINVAL The file_desc argument refers to a file with a file type that does not sup-
port the log policy associated with the trace log.
ENOSPC No space left on device. The device corresponding to the argument file_desc
does not contain the space required to create this trace log.
The posix_trace_flush() and posix_trace_shutdown() functions shall fail if:
EINVAL The value of the trid argument does not correspond to an active trace stream
with log.
EFBIG The trace log file has attempted to exceed an implementation-defined maximum
file size.
ENOSPC No space left on device.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
clock_getres() , exec() , posix_trace_attr_init() , posix_trace_clear() ,
posix_trace_close() , posix_trace_eventid_equal() , posix_trace_eventtypelist_get-
next_id() , posix_trace_flush() , posix_trace_get_attr() , posix_trace_get_filter()
, posix_trace_get_status() , posix_trace_getnext_event() , posix_trace_open() ,
posix_trace_set_filter() , posix_trace_shutdown() , posix_trace_start() ,
posix_trace_timedgetnext_event() , posix_trace_trid_eventid_open() ,
posix_trace_start() , time() , 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_CREATE(P)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-10 09:32 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)