POSIX_SPA...HEDPOLICY(3P)

💖 POSIX_SPA...HEDPOLICY 💖

okay bestie, welcome to the POSIX Programmer's Manual ✨ this page is POSIX_SPA...HEDPOLICY(3P) and we're gonna get you comfy with it.

🫶 PROLOG — real talk first: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (so go peek at the corresponding Linux manual page for the tea on Linux behavior), or honestly the interface may just not be implemented on Linux at all. 💀

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🌸 NAME 🌸

posix_spawnattr_getschedpolicy, posix_spawnattr_setschedpolicy — get and set the spawn-schedpolicy attribute of a spawn attributes object. (ADVANCED REALTIME) 👑

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✨ SYNOPSIS ✨

#include <spawn.h>
#include <sched.h>

int posix_spawnattr_getschedpolicy(const posix_spawnattr_t
    *restrict attr, int *restrict schedpolicy);
int posix_spawnattr_setschedpolicy(posix_spawnattr_t *attr,
    int schedpolicy);

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🦋 DESCRIPTION 🦋

so, two little functions, one job each:

• posix_spawnattr_getschedpolicy() — shall obtain the value of the spawn-schedpolicy attribute from the attributes object referenced by attr. it's giving "read the vibe" 📖
• posix_spawnattr_setschedpolicy() — shall set the spawn-schedpolicy attribute in an initialized attributes object referenced by attr. it's giving "set the vibe" ✍️

and what IS the spawn-schedpolicy attribute, you ask? it represents the scheduling policy to be assigned to the new process image in a spawn operation — but only if POSIX_SPAWN_SETSCHEDULER is set in the spawn-flags attribute. iykyk 🔥

⚠️ the default value of this attribute is unspecified. so don't come for me, it just is what it is 🙈

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💜 RETURN VALUE 💜

• on success, posix_spawnattr_getschedpolicy() shall return zero and store the value of the spawn-schedpolicy attribute of attr into the object referenced by the schedpolicy parameter. slay 💅
• otherwise, an error number shall be returned to indicate the error. 😭
• on success, posix_spawnattr_setschedpolicy() shall return zero.
• otherwise, an error number shall be returned to indicate the error. 🫠

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🎀 ERRORS 🎀

these functions may fail if:

• EINVAL — the value specified by attr is invalid. 🚫

and posix_spawnattr_setschedpolicy() may fail if:

• EINVAL — the value of the attribute being set is not valid. 🚫

📝 heads up bestie: the following sections are informative — like, they're the commentary track, not the actual rules.

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🌈 EXAMPLES 🌈

None. (not one. zero. the void. 💀✨)

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⭐ APPLICATION USAGE ⭐

these functions are part of the Spawn and Process Scheduling options and need not be provided on all implementations. so if you can't find them, it's not you, it's the implementation. 💔

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💅 RATIONALE 💅

None. (again, iconic minimalism ✨)

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🧚 FUTURE DIRECTIONS 🧚

None. (the future is quiet, bestie 🦋)

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👑 SEE ALSO 👑

• posix_spawn()
• posix_spawnattr_destroy()
• posix_spawnattr_getsigdefault()
• posix_spawnattr_getflags()
• posix_spawnattr_getpgroup()
• posix_spawnattr_getschedparam()
• posix_spawnattr_getsigmask()

and from The Base Definitions volume of POSIX.1‐2017: <sched.h>, <spawn.h> 📚

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💖 COPYRIGHT 💖

okay so legally speaking, 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!! this one came to you from IEEE/The Open Group, 2017 — mwah, go forth and schedule responsibly 💜✨🎀