proc_dobool(9)

✨ NAME ✨

okay so bestie, welcome to proc_dobool(9) from the Kernel API Manual — literally the cutest little helper that lets you read/write a bool 🎀

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🌸 SYNOPSIS 🌸

int proc_dobool (const struct ctl_table *table , int dir , void *buffer
, size_t *lenp , loff_t *ppos );

that's the whole signature, no cap. five args, one int coming back at you 💅

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🦋 ARGUMENTS 🦋

• table — the sysctl table, bestie. this is where all your ctl_table structs live 🗂️
• dir — TRUE if this is a write to the sysctl file. so yes, it's a write. lowkey important to know 🙈
• buffer — the user buffer ✨ this is the memory we're reading from or writing to
• lenp — the size of the user buffer, pointed at 📏
• ppos — file position. the classic "where are we in the file" vibe 🧭

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💖 DESCRIPTION 💖

so what does it actually do? it reads/writes one integer value from/to the user buffer, treated as an ASCII string 💀 yes. an integer. in a bool function. iykyk, that's just how the kernel rolls.

here's the vibe check you literally cannot skip, fr fr:

• table->data must point to a bool variable 👑
• table->maxlen must be sizeof(bool) 📐

bestie. i'm so serious. if those two conditions aren't met, you're not giving what you're supposed to give. no shortcuts, no "close enough". sizeof(bool) is the assignment, periodt.

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🔥 RETURN 🔥

0 on success 🌈 that's it, that's the whole return. iconic, honestly.

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💀 SEE ALSO 💀

the whole friend group, in exactly this order 🫶:

• 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_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_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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and that's the page, bestie 🧚 go forth and bool responsibly 💜

cute little sign-off before you close the tab: this one comes from ./kernel 🌸, dated October 2026 🎀, and the page is literally called proc_dobool(9) — slay 💅✨