trace.h(0P)

🦋 PROLOG 🦋

okay so first things first bestie: this page is part of the POSIX Programmer's Manual. 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 be implemented on Linux at all. no cap.

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✨ NAME ✨

trace.h — tracing 💅

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🎀 SYNOPSIS 🎀

#include <trace.h>

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💖 DESCRIPTION 💖

so the <trace.h> header shall define the posix_trace_event_info structure, and it's gotta include at least these members, periodt:

trace_event_id_t  posix_event_id
pid_t             posix_pid
void             *posix_prog_address
pthread_t         posix_thread_id
struct timespec   posix_timestamp
int               posix_truncation_status

the <trace.h> header shall also define the posix_trace_status_info structure, and again, at least these members:

int     posix_stream_full_status
int     posix_stream_overrun_status
int     posix_stream_status
int     posix_log_full_status
int     posix_log_overrun_status
int     posix_stream_flush_error
int     posix_stream_flush_status

and the <trace.h> header shall define these symbolic constants, the whole squad, no skips 👑:

• POSIX_TRACE_ALL_EVENTS
• POSIX_TRACE_APPEND
• POSIX_TRACE_CLOSE_FOR_CHILD
• POSIX_TRACE_FILTER
• POSIX_TRACE_FLUSH
• POSIX_TRACE_FLUSH_START
• POSIX_TRACE_FLUSH_STOP
• POSIX_TRACE_FLUSHING
• POSIX_TRACE_FULL
• POSIX_TRACE_LOOP
• POSIX_TRACE_NO_OVERRUN
• POSIX_TRACE_NOT_FLUSHING
• POSIX_TRACE_NOT_FULL
• POSIX_TRACE_INHERITED
• POSIX_TRACE_NOT_TRUNCATED
• POSIX_TRACE_OVERFLOW
• POSIX_TRACE_OVERRUN
• POSIX_TRACE_RESUME
• POSIX_TRACE_RUNNING
• POSIX_TRACE_START
• POSIX_TRACE_STOP
• POSIX_TRACE_SUSPENDED
• POSIX_TRACE_SYSTEM_EVENTS
• POSIX_TRACE_TRUNCATED_READ
• POSIX_TRACE_TRUNCATED_RECORD
• POSIX_TRACE_UNNAMED_USER_EVENT
• POSIX_TRACE_UNTIL_FULL
• POSIX_TRACE_WOPID_EVENTS

the <trace.h> header shall define the size_t, trace_attr_t, trace_event_id_t, trace_event_set_t, and trace_id_t types as described in <sys/types.h>. it's giving very "go read the other header" of it but okay 🫶

the following shall be declared as functions and may also be defined as macros. function prototypes shall be provided. (yes bestie, ALL of them, i'm not skipping a single one, we're doing the whole roster 💜)

int  posix_trace_attr_destroy(trace_attr_t *);
int  posix_trace_attr_getclockres(const trace_attr_t *,
         struct timespec *);
int  posix_trace_attr_getcreatetime(const trace_attr_t *,
         struct timespec *);
int  posix_trace_attr_getgenversion(const trace_attr_t *, char *);
int  posix_trace_attr_getinherited(const trace_attr_t *restrict,
         int *restrict);
int  posix_trace_attr_getlogfullpolicy(const trace_attr_t *restrict,
         int *restrict);
int  posix_trace_attr_getlogsize(const trace_attr_t *restrict,
         size_t *restrict);
int  posix_trace_attr_getmaxdatasize(const trace_attr_t *restrict,
         size_t *restrict);
int  posix_trace_attr_getmaxsystemeventsize(const trace_attr_t *restrict,
         size_t *restrict);
int  posix_trace_attr_getmaxusereventsize(const trace_attr_t *restrict,
         size_t, size_t *restrict);
int  posix_trace_attr_getname(const trace_attr_t *, char *);
int  posix_trace_attr_getstreamfullpolicy(const trace_attr_t *restrict,
         int *restrict);
int  posix_trace_attr_getstreamsize(const trace_attr_t *restrict,
         size_t *restrict);
int  posix_trace_attr_init(trace_attr_t *);
int  posix_trace_attr_setinherited(trace_attr_t *, int);
int  posix_trace_attr_setlogfullpolicy(trace_attr_t *, int);
int  posix_trace_attr_setlogsize(trace_attr_t *, size_t);
int  posix_trace_attr_setmaxdatasize(trace_attr_t *, size_t);
int  posix_trace_attr_setname(trace_attr_t *, const char *);
int  posix_trace_attr_setstreamfullpolicy(trace_attr_t *, int);
int  posix_trace_attr_setstreamsize(trace_attr_t *, size_t);
int  posix_trace_clear(trace_id_t);
int  posix_trace_close(trace_id_t);
int  posix_trace_create(pid_t, const trace_attr_t *restrict,
         trace_id_t *restrict);
int  posix_trace_create_withlog(pid_t, const trace_attr_t *restrict,
         int, trace_id_t *restrict);
void posix_trace_event(trace_event_id_t, const void *restrict, size_t);
int  posix_trace_eventid_equal(trace_id_t, trace_event_id_t,
         trace_event_id_t);
int  posix_trace_eventid_get_name(trace_id_t, trace_event_id_t, char *);
int  posix_trace_eventid_open(const char *restrict,
         trace_event_id_t *restrict);
int  posix_trace_eventset_add(trace_event_id_t, trace_event_set_t *);
int  posix_trace_eventset_del(trace_event_id_t, trace_event_set_t *);
int  posix_trace_eventset_empty(trace_event_set_t *);
int  posix_trace_eventset_fill(trace_event_set_t *, int);
int  posix_trace_eventset_ismember(trace_event_id_t,
         const trace_event_set_t *restrict, int *restrict);
int  posix_trace_eventtypelist_getnext_id(trace_id_t,
         trace_event_id_t *restrict, int *restrict);
int  posix_trace_eventtypelist_rewind(trace_id_t);
int  posix_trace_flush(trace_id_t);
int  posix_trace_get_attr(trace_id_t, trace_attr_t *);
int  posix_trace_get_filter(trace_id_t, trace_event_set_t *);
int  posix_trace_get_status(trace_id_t,
         struct posix_trace_status_info *);
int  posix_trace_getnext_event(trace_id_t,
         struct posix_trace_event_info *restrict, void *restrict,
         size_t, size_t *restrict, int *restrict);
int  posix_trace_open(int, trace_id_t *);
int  posix_trace_rewind(trace_id_t);
int  posix_trace_set_filter(trace_id_t, const trace_event_set_t *, int);
int  posix_trace_shutdown(trace_id_t);
int  posix_trace_start(trace_id_t);
int  posix_trace_stop(trace_id_t);
int  posix_trace_timedgetnext_event(trace_id_t,
         struct posix_trace_event_info *restrict, void *restrict,
         size_t, size_t *restrict, int *restrict,
         const struct timespec *restrict);
int  posix_trace_trid_eventid_open(trace_id_t, const char *restrict,
         trace_event_id_t *restrict);
int  posix_trace_trygetnext_event(trace_id_t,
         struct posix_trace_event_info *restrict, void *restrict, size_t,
         size_t *restrict, int *restrict);

heads up: the following sections are informative. (that's the actual text, not me being shady 😌)

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🌸 APPLICATION USAGE 🌸

None. literally nothing. she said "no notes" 💀

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🌈 RATIONALE 🌈

None. also nothing. the silence is iconic honestly.

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🔥 FUTURE DIRECTIONS 🔥

the <trace.h> header may be removed in a future version. so like, don't get too attached bestie, this is a situationship 🫠

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💜 SEE ALSO 💜

• <sys_types.h>

The System Interfaces volume of POSIX.1‐2017, Section 2.11, Tracing, posix_trace_attr_destroy(), posix_trace_attr_getclockres(), posix_trace_attr_getinherited(), posix_trace_attr_getlogsize(), posix_trace_clear(), posix_trace_close(), posix_trace_create(), posix_trace_event(), posix_trace_eventid_equal(), posix_trace_eventset_add(), posix_trace_eventtypelist_getnext_id(), posix_trace_get_attr(), posix_trace_get_filter(), posix_trace_getnext_event(), posix_trace_start()

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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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and that's the whole page bestie 🫶 she's stamped IEEE/The Open Group, 2017, filed under trace.h(0P). go forth and trace, you absolute main character ✨💅