proc_doulongvec_conv(9)

💖 proc_doulongvec_conv 💖

okay so bestie, this is a page from the Kernel API Manual and it's all about proc_doulongvec_conv — a little function that reads a vector of unsigned longs using a custom converter of your very own. yes, you get to bring your own converter. main character energy fr fr 🌟

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✨ SYNOPSIS ✨

int proc_doulongvec_conv (const struct ctl_table *table , int dir , void
*buffer , size_t *lenp , loff_t *ppos , int (*conv)(bool *negp, ulong
*u_ptr, ulong *k_ptr, int dir, const struct ctl_table *table) );

like, look at all those parameters. it's giving "six arguments and every one of them matters" 💅 copy it exactly, no cap.

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🌸 ARGUMENTS 🌸

• table — the sysctl table, aka the whole reason we're here 🎀
• dir — TRUE if this is a write to the sysctl file (yes, TRUE literally means write, iconic oddly-specific behaviour 💀)
• buffer — the user buffer, where the good stuff lives
• lenp — the size of the user buffer
• ppos — file position
• conv — your Custom converter call back 🦋 this is the whole point, bestie

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🎀 DESCRIPTION 🎀

so what does it actually do? it reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long values from/to the user buffer, and the user buffer is treated as an ASCII string. very "we're parsing text but make it numbers" of it 😌

and here's the vibe check: negative strings are not allowed. like, don't even try. not permitted. periodt 🚫

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⭐ RETURN ⭐

• 0 on success 🎉 that's it, that's the whole return situation

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🌈 SEE ALSO 🌈

the whole friend group, in the order the page lists them, because we do not skip anyone in this house 🫶

Kernel file ./kernel/sysctl.c, then: enum sysctl_writes_mode(9), proc_first_pos_non_zero_ignore(9), proc_dostring(9), strtoul_lenient(9), proc_get_long(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_minmax(9), proc_dointvec_conv(9), proc_do_large_bitmap(9) ✨

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ngl if you got this far you're lowkey a kernel girlie now. go read the source, it's right there in ./kernel 💜

and that's the whole page!! sourced from ./kernel, dated October 2026, and it's the proc_doulongvec_conv(9) girlies' manual forever 💖🦋✨ mwah, bye bestie!