kstrdup(9)

💖 kstrdup(9) 💖

okay bestie, so this is a page from the Kernel API Manual and it's literally the whole kstrdup vibe. stay with me, it's short and it slays.

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✨ NAME ✨

kstrdup — allocate space for and copy an existing string

like, it makes room and then copies the string into it. the whole package. 🎀

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🌸 SYNOPSIS 🌸

char * kstrdup (const char *s , gfp_t gfp );

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🦋 ARGUMENTS 🦋

• s — the string to duplicate. your main character string, the one getting copied 💅
• gfp — the GFP mask used in the kmalloc call when allocating memory. yes the memory allocation is happening, and this is the mask it uses, no cap

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⭐ RETURN ⭐

it hands you a newly allocated copy of s — iconic — or NULL if something went wrong 😭 in case of error, it's NULL.

fr fr check it. NULL is a real possible answer here, don't just assume you got a string back and go dereferencing it, bestie 💀

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🔥 SEE ALSO 🔥

this list is lowkey long but every single one of these is invited to the party, no gatekeeping:

• Kernel file ./mm/util.c
• kfree_const(9)
• __kmemdup_nul(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)
• get_cmdline(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)

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and that's the page!! 🫶 this whole thing lives under ./mm, dated October 2026, and it's titled kstrdup(9) — go forth and duplicate your strings responsibly, bestie, mwah 💜✨🌈