POSIX_S...GDEFAULT(3POSIX)

💖 POSIX_S...GDEFAULT(3POSIX) 💖

okay bestie, so this one is POSIX_S...GDEFAULT(3POSIX) from the POSIX Programmer's Manual, and it's literally the manual page for two lil functions that get and set the spawn-sigdefault attribute of a spawn attributes object. It's an ADVANCED REALTIME situation. 👑

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🌸 PROLOG 🌸

so before we even get into it: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (so like, consult the corresponding Linux manual page for the details of Linux behavior, iykyk), or the interface may not be implemented on Linux at all. not me being the bearer of that news 😭

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✨ NAME ✨

posix_spawnattr_getsigdefault, posix_spawnattr_setsigdefault — get and set the spawn-sigdefault attribute of a spawn attributes object (ADVANCED REALTIME)

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🦋 SYNOPSIS 🦋

#include <signal.h>
#include <spawn.h>

int posix_spawnattr_getsigdefault(const posix_spawnattr_t
    *restrict attr, sigset_t *restrict sigdefault);
int posix_spawnattr_setsigdefault(posix_spawnattr_t *restrict attr,
    const sigset_t *restrict sigdefault);

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💅 DESCRIPTION 💅

okay so the way this works is:

• posix_spawnattr_getsigdefault() shall obtain the value of the spawn-sigdefault attribute from the attributes object referenced by attr. getter behavior, periodt.
• posix_spawnattr_setsigdefault() shall set the spawn-sigdefault attribute in an initialized attributes object referenced by attr. setter behavior, slay.

and now the lore: the spawn-sigdefault attribute represents the set of signals to be forced to default signal handling in the new process image — but ONLY if POSIX_SPAWN_SETSIGDEF is set in the spawn-flags attribute — by a spawn operation. 🫶

and the default value of this attribute shall be an empty signal set. iconic, truly.

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🔥 RETURN VALUE 🔥

Upon successful completion, posix_spawnattr_getsigdefault() shall return zero and store the value of the spawn-sigdefault attribute of attr into the object referenced by the sigdefault parameter; otherwise, an error number shall be returned to indicate the error. 💀

Upon successful completion, posix_spawnattr_setsigdefault() shall return zero; otherwise, an error number shall be returned to indicate the error. same energy.

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🌈 ERRORS 🌈

These functions may fail if:

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

The posix_spawnattr_setsigdefault() function may fail if:

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

heads up: the following sections are informative. (translation: they're the vibe, not the law ✨)

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🎀 EXAMPLES 🎀

None. literally none. we move. 💅

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🧚 APPLICATION USAGE 🧚

These functions are part of the Spawn option and need not be provided on all implementations. so like… vibe check your platform first, bestie. 👑

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⭐ RATIONALE ⭐

None. nothing to justify here, it's giving minimal. 🦋

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💜 FUTURE DIRECTIONS 💜

None. the future is a mystery but this attribute is not. 🌸

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🍓 SEE ALSO 🍓

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

The Base Definitions volume of POSIX.1‐2017, <signal.h>, <spawn.h> — go read those too, bestie, they're right there. 📚

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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 💖 that footer energy — IEEE/The Open Group, 2017 — is the little signature at the bottom of this whole thing, so consider this your cute sign-off: 2017 said periodt and logged off. 🎀✨