proc_get_long(9)

💅 proc_get_long(9) — the Kernel API Manual, but make it make sense 🎀

okay so bestie, we're in the Kernel API Manual today and this page is literally about proc_get_long — a little function that reads an ASCII formatted integer out of a user buffer. it's giving "parser but make it kernel" ✨ iykyk.

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🌸 NAME 🌸

proc_get_long — reads an ASCII formatted integer from a user buffer 💖

no cap, that's the whole vibe. it goes and gets you a long. from ASCII. out of a user buffer. slay.

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✨ SYNOPSIS ✨

int proc_get_long (char **buf , size_t *size , unsigned long *val , bool
*neg , const char *perm_tr , unsigned perm_tr_len , char *tr );

that's seven arguments bestie, count 'em, i'll wait 🫶 (it's seven.)

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🦋 ARGUMENTS 🦋

okay so here's the cast of characters, main character energy incoming 👑

• buf — a kernel buffer. that's the thing we're reading out of, periodt.
• size — size of the kernel buffer. like how much room there is to look at 🔥
• val — this is where the number will be stored. the whole point of the function honestly, the icon, the moment 💅
• neg — set to TRUE if number is negative. so if you see a little minus sign, this flag gets its glow-up 😭
• perm_tr — a vector which contains the allowed trailers. trailers as in trailing characters, not as in movie previews, keep up 🎬
• perm_tr_len — size of the perm_tr vector. every vector needs its length bestie, it's called ✨consistency✨
• tr — pointer to store the trailer character. so the trailing character has somewhere to live 🏠

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💀 RETURN 💀

here's what you get back, no surprises, we keep it honest:

• 0 on success — and buf and size are updated with the amount of bytes read. 📖 also! if tr is non-NULL and a trailing character exists (meaning size is non-zero after returning from this function), then tr is updated with the trailing character 💖
• -EINVAL on failure. rip. that's the "you gave me nonsense" error 🙈

ngl, the size is non-zero after returning bit is the sneaky important part — that's how you know a trailer actually got captured, so don't skip the vibe check on it 👀

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🌈 SEE ALSO 🌈

here's the whole friend group, the entire group chat, all linked from the kernel file ./kernel/sysctl.c 🧚 — like genuinely, this list ate and left no crumbs:

• enum sysctl_writes_mode(9)
• proc_first_pos_non_zero_ignore(9)
• proc_dostring(9)
• strtoul_lenient(9)
• proc_put_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)

like?? look at them all, highkey iconic 😭💜

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and that's the page babes 🎀 — brought to you by the fine folks in ./kernel, dated October 2026, back when this doc was born. mwah 💋 go read the source, i'm obsessed with you 🦋