POSIX_SPAWNATTR_INIT(3)

💅 POSIX_SPAWNATTR_INIT(3) — spawn attributes, but make it init/destroy

okay so bestie, this is a page from the Library Functions Manual and it's about two little functions that handle the setup and teardown of a spawn attributes object. Think of it as the "make me a fresh one" and "okay throw it away now" duo. 🎀

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✨ NAME ✨

posix_spawnattr_init, posix_spawnattr_destroy — initialize and destroy spawn attributes object

like, exactly what it says on the tin, no notes 💅

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📚 LIBRARY 📚

Standard C Library (libc, -lc)

she lives in libc, she's built in, you don't need to go hunting 🫶

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🧚 SYNOPSIS 🧚

#include <spawn.h>

int
posix_spawnattr_init(posix_spawnattr_t * attr);

int
posix_spawnattr_destroy(posix_spawnattr_t * attr);

two functions, same shape, both taking a pointer to a posix_spawnattr_t. iconic symmetry honestly ✨

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🌸 DESCRIPTION 🌸

okay so first up, posix_spawnattr_init() initializes a spawn attributes object attr with the default value for all of the individual attributes used by the implementation. it's the blank-slate moment, the fresh-start vibe, the "new phone who dis" of attribute objects 💖

⚠️ but bestie, listen — initializing an already initialized spawn attributes object may cause memory to be leaked. so don't double-init. that's not a slay, that's a leak. 😭

then there's posix_spawnattr_destroy(), which destroys a spawn attributes object. and here's the cute part: a destroyed attr attributes object can be reinitialized using posix_spawnattr_init(). so it's not gone gone, it's just recycled. 🌈

🚫 however, the object should not be used after it has been destroyed. no zombie usage. respect the lifecycle. 💀

so like, what even is a spawn attributes object? it's of type posix_spawnattr_t (defined in <spawn.h>) and it's used to specify the inheritance of process attributes across a spawn operation. it's literally the little settings brief you hand over before spawning 🎀

the resulting spawn attributes object (possibly modified by setting individual attribute values) is used to modify the behavior of posix_spawn() or posix_spawnp(). so you build it, you tweak it, then you pass it along and it does its thing.

and the important caveat: after a spawn attributes object has been used to spawn a process by a call to a posix_spawn() or posix_spawnp(), any function affecting the attributes object (including destruction) will not affect any process that has been spawned in this way. like, once the baby has left the house, changing the house rules doesn't reach them anymore. the spawned process is independent, periodt. 👑

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🦋 RETURN VALUES 🦋

upon successful completion, posix_spawnattr_init() and posix_spawnattr_destroy() return zero. zero = good = slay ✨

otherwise, an error number is returned to indicate the error. so if it's not zero, something's up and you should go look 🔥

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🍓 ERRORS 🍓

the posix_spawnattr_init() function will fail if:

• [ENOMEM] — Insufficient memory exists to initialize the spawn attributes object. 😭 the malloc girlies are weeping. not enough room for your little attribute object, tragic.

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👑 SEE ALSO 👑

• posix_spawn(3)
• posix_spawnp(3)

go read those next, iykyk 💜

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⭐ STANDARDS ⭐

the posix_spawnattr_init() and posix_spawnattr_destroy() functions conform to IEEE Std 1003.1-2001 (“POSIX.1”). certified, standards-approved, no cap 🎀

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🌸 HISTORY 🌸

the posix_spawnattr_init() and posix_spawnattr_destroy() functions first appeared in FreeBSD 8.0. vintage, but like, in a cool way 💅

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💖 AUTHORS 💖

Ed Schouten <ed@FreeBSD.org> — thank you for your service king 🫶

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and that's the whole page bestie, you ate that reading ngl 🌟 this one's from Debian, dated March 24, 2008 — a classic, an icon, a moment in time 💅✨