proc_put_long(9)

💖 proc_put_long(9) — or, the little kernel helper that turns your integer into decimal ASCII ✨

okay so bestie, welcome to the Kernel API Manual 🎀 and today's main character is proc_put_long — genuinely one of those tiny functions that does one (1) thing and does it slayfully 💅

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🌸 NAME 🌸

proc_put_long — converts an integer to a decimal ASCII formatted string ✨ (yes, that's literally the whole job, and it ate 🔥)

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🦋 SYNOPSIS 🦋

void proc_put_long (void **buf , size_t *size , unsigned long val , bool neg );

like… look at that signature. four args, zero drama, void return because it doesn't need to brag 🫶

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🎀 ARGUMENTS 🎀

• buf — the user buffer 💖 (the place where the pretty decimal ASCII string ends up)
• size — the size of the user buffer 🌸 (the vibe check on how much room we've got)
• val — the integer to be converted 👑 (the number that's getting its glow-up into decimal ASCII)
• neg — sign of the number, TRUE for negative 🌈 (so we know whether to bring the minus sign energy)

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✨ DESCRIPTION ✨

In case of success buf and size are updated with the amount of bytes written 💫

that's it, that's the whole description, and honestly? iconic. lowkey refreshing after reading a manpage with 40 options ngl 😭

fr fr bestie: it says "in case of success" — so like, don't assume the pointers got moved unless it actually worked, okay? 🫶

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💜 SEE ALSO 💜

the whole fam, gathered for the group chat 📱💅 — every single one of these:

• Kernel file ./kernel/sysctl.c
• enum sysctl_writes_mode(9)
• proc_first_pos_non_zero_ignore(9)
• proc_dostring(9)
• strtoul_lenient(9)
• proc_get_long(9)
• proc_uint_u2k_conv_uop(9)
• proc_uint_k2u_conv(9)
• proc_uint_conv(9)
• proc_int_k2u_conv_kop(9)
• proc_int_u2k_conv_uop(9)
• proc_int_conv(9)
• proc_douintvec_conv(9)
• proc_dobool(9)
• proc_dointvec(9)
• proc_douintvec(9)
• proc_dointvec_minmax(9)
• proc_douintvec_minmax(9)
• proc_dou8vec_minmax(9)
• proc_ulong_conv(9)
• proc_ulong_u2k_conv_uop(9)
• proc_ulong_k2u_conv_kop(9)
• proc_doulongvec_conv(9)
• proc_doulongvec_minmax(9)
• proc_dointvec_conv(9)
• proc_do_large_bitmap(9)

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okay that's the whole page, go read the sysctl syscall doc bestie, it's giving prerequisite energy 💀✨

signed, sealed, delivered by the ./kernel crew — October 2026 edition 🌸🫶