POSIX_TRACE_START(3P)

💖 PROLOG 💖

okay so real talk bestie — this page is part of the POSIX Programmer's Manual. the Linux implementation of this interface may differ (so like, go check the matching 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_start, posix_trace_stop — trace start and stop, aka the (TRACING) girlies 💅

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🦋 SYNOPSIS 🦋

#include <trace.h>

int posix_trace_start(trace_id_t trid);
int posix_trace_stop (trace_id_t trid);

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🌸 DESCRIPTION 🌸

so posix_trace_start() and posix_trace_stop() do exactly what their names say, no cap: they start and stop the trace stream identified by the argument trid. that's it, that's the vibe. 🫶

the effect of calling posix_trace_start() 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_RUNNING. ✨ now here's the tea — if the trace stream is already in progress when you call this function, then the POSIX_TRACE_START system trace event shall not be recorded and the trace stream just keeps running. and if the trace stream is full? the POSIX_TRACE_START system trace event shall not be recorded and the status of the trace stream shall not be changed. periodt. 💀

the effect of calling posix_trace_stop() 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 already suspended when you call this function, the POSIX_TRACE_STOP system trace event shall not be recorded and the trace stream shall remain suspended. and if the trace stream is full, the POSIX_TRACE_STOP system trace event shall not be recorded and the status of the trace stream shall not be changed. same energy, different event. 🙃

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👑 RETURN VALUE 👑

upon successful completion, these functions shall return a value of zero. otherwise, they shall return the corresponding error number. that's the whole deal bestie. ⭐

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🔥 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. so like, nothing happened, sorry. 😭
• EINTR — the operation was interrupted by a signal and thus the trace stream was not necessarily started or stopped. rude tbh. 🙈

heads up: the following sections are informative. (translation: they're the bonus content, not the rules 💜)

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🎀 EXAMPLES 🎀

None.

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🌈 APPLICATION USAGE 🌈

None.

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🧚 RATIONALE 🧚

None.

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💅 FUTURE DIRECTIONS 💅

the posix_trace_start() and posix_trace_stop() functions may be removed in a future version. so like… enjoy them while they're here. 😭

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🍓 SEE ALSO 🍓

• posix_trace_create()

the Base Definitions volume of POSIX.1‐2017, <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 bestie that's the whole page 💖 this icon was brought to you by IEEE/The Open Group, dated 2017, and it lives in the manual as POSIX_TRACE_START(3P). go slay those trace streams, mwah 💋✨