POSIX_TRACE_CLEAR(3POSIX)

💖 POSIX_TRACE_CLEAR 💖

okay bestie, welcome to the POSIX Programmer's Manual, 3POSIX section, and today's main character is posix_trace_clear 🎀

heads up though: this page is part of the POSIX Programmer's Manual, and the Linux implementation of this interface may differ (so like, go check the corresponding Linux manual page for the deets on Linux behavior), or honestly the interface may not even be implemented on Linux at all. 🙈

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✨ NAME ✨

posix_trace_clear — clear trace stream and trace log (TRACING) 🧚

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🌸 SYNOPSIS 🌸

#include <sys/types.h>
#include <trace.h>

int posix_trace_clear(trace_id_t trid);

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🦋 DESCRIPTION 🦋

so posix_trace_clear() literally reinitializes the trace stream identified by the argument trid as if it were returning from the posix_trace_create() function — except that:

• the same allocated resources shall be reused ♻️
• the mapping of trace event type identifiers to trace event names shall be unchanged 💅
• the trace stream status shall remain unchanged — that is, if it was running, it remains running, and if it was suspended, it remains suspended ⏸️▶️

All trace events in the trace stream recorded before the call to posix_trace_clear() shall be lost. 😭 The posix_stream_full_status status shall be set to POSIX_TRACE_NOT_FULL. And ngl, there is no guarantee that all trace events that occurred during the posix_trace_clear() call are recorded — the behavior with respect to trace points that may occur during this call is unspecified. 💀

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and if the Trace Log option is supported and the trace stream has been created with a log, then posix_trace_clear() shall reinitialize the trace stream with the same behavior as if the trace stream was created without the log, plus it shall reinitialize the trace log associated with the trace stream identified by the argument trid as if it were returning from the posix_trace_create_withlog() function — except that the same allocated resources, for the trace log, may be reused and the associated trace stream status remains unchanged. 🫶

The first trace event recorded in the trace log after the call to posix_trace_clear() shall be the same as the first trace event recorded in the active trace stream after the call to posix_trace_clear(). The posix_log_full_status status shall be set to POSIX_TRACE_NOT_FULL. There is no guarantee that all trace events that occurred during the posix_trace_clear() call are recorded in the trace log; the behavior with respect to trace points that may occur during this call is unspecified. 🙈

and if the log full policy is POSIX_TRACE_APPEND, the effect of a call to this function is unspecified for the trace log associated with the trace stream identified by the trid argument. bestie, watch out. 💀

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⭐ RETURN VALUE ⭐

Upon successful completion, posix_trace_clear() shall return a value of zero 🎉. Otherwise, it shall return the corresponding error number.

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🔥 ERRORS 🔥

The posix_trace_clear() function shall fail if:

• EINVAL — the value of the trid argument does not correspond to an active trace stream. 😤

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the following sections are informative. 👑

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🍓 EXAMPLES 🍓

None. (yes, literally none, that's the whole vibe 😌)

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💜 APPLICATION USAGE 💜

None. (also none, we're keeping it minimal fr fr)

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🌈 RATIONALE 🌈

None. (none again, iconic honestly)

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🧚 FUTURE DIRECTIONS 🧚

The posix_trace_clear() function may be removed in a future version. 👀 so like, don't get too attached.

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👑 SEE ALSO 👑

• posix_trace_attr_destroy()
• posix_trace_create()
• posix_trace_get_attr()

Also, from the Base Definitions volume of POSIX.1‐2017: <sys_types.h>, <trace.h> 📚

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💅 COPYRIGHT 💅

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

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 .

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okay that's the whole page bestie, you ate that 💅✨ this one's brought to you by IEEE/The Open Group, 2017, for the manual POSIX_TRACE_CLEAR(3POSIX) — periodt. 🫶