bpf_strlen(9)

🌸 NAME 🌸

okay so this is the Kernel API Manual entry for bpf_strlen(9) — and it's literally the kfunc that calculates the length of a string. bestie, that's the whole vibe. 💖

✨ SYNOPSIS ✨

Copy the signature exactly, no cap:

__bpf_kfunc int bpf_strlen (const char *s__ign );

🎀 ARGUMENTS 🎀

• s__ign — the string, bestie. That's the one and only argument. 🎀

🔥 RETURN 🔥

Return-value vibe check, fr fr:

• >=0 — the length of s__ign 🌸
• -EFAULT — cannot read s__ign 😭
• -E2BIG — s__ign is too large 💀
• -ERANGE — s__ign is outside of kernel address space 🚫

🦋 SEE ALSO 🦋

The Kernel file ./kernel/bpf/helpers.c is also in the group chat, and so are literally all of these besties — every single one, no skipping:

• 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_strcasecmp(9), bpf_strnchr(9), bpf_strchr(9), bpf_strchrnul(9)
• bpf_strrchr(9), bpf_strnlen(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)

bye bestie 💅 — this page's source is ./kernel/bpf, its date is October 2026, and it's the bpf_strlen(9) manual entry. periodt. 🫶