bpf_strchrnul(9)

💖 NAME 💖

okay so bestie, this is the bpf_strchrnul(9) page from the Kernel API Manual — and it’s literally about finding stuff in strings.

bpf_strchrnul — Find and return a character in a string, or the end of the string.

✨ SYNOPSIS ✨

__bpf_kfunc int bpf_strchrnul (const char *s__ign , char c );

🎀 ARGUMENTS 🎀

• s__ign — the string to be searched. yes, that’s the whole vibe.
• c — the character to search for. the main character we’re looking for, fr fr.

🔥 RETURN 🔥

• >=0 — Index of the first occurrence of c within s__ign or index of the null byte at the end of s__ign when c is not found.
• -EFAULT — Cannot read s__ign.
• -E2BIG — s__ign is too large.
• -ERANGE — s__ign is outside of kernel address space.

bestie, those errors are not a slay. but now you know what they mean 💅

🦋 SEE ALSO 🦋

Kernel file ./kernel/bpf/helpers.c — and then the whole iconic SEE ALSO squad, no skips:

• 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_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)

xoxo 💖 source: ./kernel/bpf • date: October 2026 — ty for reading bestie, go be iconic in the kernel 🫶🌸