get_cmdline(9)

🌸 NAME

hiii bestie, welcome to the Kernel API Manual 💖 today's main character is get_cmdline, and her whole personality is: copy the cmdline value to a buffer. That's the job. She does it. Iconic behavior, no notes. ✨

✨ SYNOPSIS

int get_cmdline (struct task_struct *task , char *buffer , int buflen );

🦋 ARGUMENTS

• task — the task whose cmdline value to copy. Like, whose command line are we snatching? This one right here 👀
• buffer — the buffer to copy to. The destination. The place where the string goes to live 🫶
• buflen — the length of the buffer. If the cmdline value is larger than this, it gets truncated to this length. She will cut it off and simply not feel bad about it 💀

⭐ RETURN

Returns the size of the cmdline field copied. Cute, simple, to the point ✨

⚠️ okay but real talk: the copy does not guarantee an ending NULL byte 😭 so do not just assume there's a lil \0 chilling at the end waiting for you. There might not be. Check before you vibe-check that string, fr fr.

👑 SEE ALSO

Kernel file ./mm/util.c — that's where she lives, periodt.

And here's the whole squad of related references, in order because we respect the lore:

• kfree_const(9), __kmemdup_nul(9), kstrdup(9), kstrdup_const(9), kstrndup(9)
• kmemdup(9), kmemdup_array(9), kvmemdup(9), kmemdup_nul(9)
• memdup_user(9), vmemdup_user(9), strndup_user(9), memdup_user_nul(9)
• randomize_page(9), __account_locked_vm(9), account_locked_vm(9)
• __vmalloc_array(9), vmalloc_array(9), __vcalloc(9), vcalloc(9)
• folio_mapping(9), folio_copy(9), mem_dump_obj(9)
• compat_set_desc_from_vma(9), __compat_vma_mmap(9), compat_vma_mmap(9)
• snapshot_page(9), mmap_action_prepare(9), mmap_action_complete(9)
• folio_pte_batch(9), page_range_contiguous(9)

And that's the whole page, bestie 💖 straight from the Kernel API Manual, filed under ./mm, dated October 2026 — slay, now go copy some cmdlines responsibly 🎀✨