bpf_strcasecmp(9)

✨ bpf_strcasecmp ✨

okay so this is a page from the Kernel API Manual, section 9 — yes, the kernel one, we're literally in the big leagues bestie 💅

---

🌸 NAME 🌸

bpf_strcasecmp — compare two strings but like… ignore the case of the characters 🫶

---

🎀 SYNOPSIS 🎀

__bpf_kfunc int bpf_strcasecmp (const char *s1__ign , const char *s2__ign );

---

💖 ARGUMENTS 💖

• s1__ign — one string. just a string. the first one 🍓
• s2__ign — another string. the other one. the competitor. the rival 😭

---

🔥 RETURN 🔥

so here's the vibe check on what you get back 👑

• 0 — the strings are equal (slay, a match, they ate 💅)
• -1 — s1__ign is smaller
• 1 — s2__ign is smaller
• -EFAULT — cannot read one of the strings 🫠
• -E2BIG — one of the strings is too large, it's giving main character energy, too much
• -ERANGE — one of the strings is outside of the kernel address space, literally lost in the void ✨

---

🦋 SEE ALSO 🦋

the kernel file ./kernel/bpf/helpers.c — that's where the magic lives, and also a whole group chat of friends:

• bpf_obj_new(9), bpf_percpu_obj_new(9), bpf_obj_drop(9), bpf_percpu_obj_drop(9)
• bpf_refcount_acquire(9), bpf_list_push_front(9), bpf_list_push_back(9), bpf_rbtree_add(9)
• bpf_task_acquire(9), bpf_task_release(9)
• bpf_cgroup_acquire(9), bpf_cgroup_release(9), bpf_cgroup_ancestor(9), bpf_cgroup_from_id(9)
• bpf_task_under_cgroup(9), bpf_task_get_cgroup1(9), bpf_task_from_pid(9), bpf_task_from_vpid(9)
• bpf_dynptr_slice(9), bpf_dynptr_slice_rdwr(9), bpf_dynptr_copy(9), bpf_dynptr_memset(9)
• bpf_iter_bits_new(9), bpf_iter_bits_next(9), bpf_iter_bits_destroy(9)
• bpf_copy_from_user_str(9), bpf_copy_from_user_task_str(9)
• bpf_strcmp(9), bpf_strnchr(9), bpf_strchr(9), bpf_strchrnul(9), bpf_strrchr(9), bpf_strnlen(9), bpf_strlen(9), bpf_strspn(9), bpf_strcspn(9), bpf_strstr(9), bpf_strcasestr(9), bpf_strnstr(9), bpf_strncasestr(9)
• bpf_lookup_user_key(9), bpf_lookup_system_key(9), bpf_key_put(9), bpf_verify_pkcs7_signature(9)
• bpf_task_work_schedule_signal(9), bpf_task_work_schedule_resume(9), bpf_timer_cancel_async(9)

ngl that's a whole friend group and every single one of them is iconic, go read them too 🧚

---

and that's the page bestie!! brought to you by ./kernel/bpf, dated October 2026, and the header says bpf_strcasecmp(9) — mwah, periodt 💜🌈👑