invalf(9)

💖 NAME 💖

okay so bestie, this is invalf(9) from the Kernel API Manual, and it has one very specific little job: it stores a supplementary invalid argument error message. slay.

• invalf — Store supplementary invalid argument error message

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✨ SYNOPSIS ✨

invalf (fc , fmt , ... );

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🎀 ARGUMENTS 🎀

• fc — the context in which to log the error message. literally where the logging happens 💅
• fmt — the format string.
• ... — variable arguments. yes, the little dots are doing their thing 🫶

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🌸 DESCRIPTION 🌸

It stores the supplementary error message for the process if the process has enabled the facility, and then it returns -EINVAL.

that's it. that's the whole vibe check: check the facility, store the message, return -EINVAL. periodt 💜

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🦋 SEE ALSO 🦋

• Kernel file ./include/linux/fs_context.h
• infof(9)
• warnf(9)
• errorf(9)

go read those too, iykyk 🔥

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mwah 💋 this iconic little page comes from source ./include/linux, dated October 2026, and it’s invalf(9) — no cap, that’s the whole sign-off 🎀✨