binder_proc_transaction(9)

💅 binder_proc_transaction(9) 💅

okay so bestie, this is a page from the Kernel API Manual (yes, the kernel has lore too) and it's all about binder_proc_transaction — the little function that yeets a transaction at a process and then goes "wake up diva, you got mail 💌". Let's get into it.

---

✨ NAME ✨

binder_proc_transaction — sends a transaction to a process and wakes it up. that's it, that's the whole gig. queen behavior honestly.

---

🦋 SYNOPSIS 🦋

int binder_proc_transaction (struct binder_transaction *t , struct
binder_proc *proc , struct binder_thread *thread );

---

🎀 ARGUMENTS 🎀

• t — the transaction that's getting sent. the main character of this whole operation tbh.
• proc — the process we're sending said transaction to. the destination, the moment, the vibe.
• thread — the specific thread in proc we're sending it to. and heads up: this one may be NULL, it's not a mandatory guest at the party.

---

🌸 DESCRIPTION 🌸

so what this function does is queue a transaction to the specified process. it'll try to find a thread inside the target process that can handle the transaction, and then it wakes that thread up. if it can't find any thread at all? no stress — the work just gets queued to the proc waitqueue instead. it's giving "no thread available, leaving it on read but like, in the queue" energy. 💅

aaaand if the thread parameter is not NULL, then the transaction is always queued to the waitlist of that exact specific thread. no searching, no choosing, it goes straight to her. periodt.

---

👑 RETURN 👑

• 0 — slay, the transaction was successfully queued.
• BR_DEAD_REPLY — the target process or thread is dead 😭 rip.
• BR_FROZEN_REPLY — the target process or thread is frozen and the sync transaction was rejected 🥶.
• BR_TRANSACTION_PENDING_FROZEN — the target process is frozen but the async transaction was successfully queued anyway. iconic loophole tbh.

---

🌈 SEE ALSO 🌈

the Kernel file ./drivers/android/binder.c is the source of truth here, and these are all the besties in the same friend group 💖:

• binder_proc_lock(9), binder_proc_unlock(9), binder_inner_proc_lock(9), binder_inner_proc_unlock(9)
• binder_node_lock(9), binder_node_unlock(9), binder_node_inner_lock(9), binder_node_inner_unlock(9)
• binder_worklist_empty(9)
• binder_enqueue_work_ilocked(9), binder_enqueue_deferred_thread_work_ilocked(9), binder_enqueue_thread_work_ilocked(9), binder_enqueue_thread_work(9), binder_dequeue_work(9)
• binder_select_thread_ilocked(9), binder_wakeup_thread_ilocked(9)
• binder_inc_node_tmpref(9), binder_dec_node_tmpref(9)
• binder_get_ref_for_node_olocked(9), binder_inc_ref_olocked(9), binder_dec_ref_olocked(9), binder_get_node_from_ref(9), binder_free_ref(9)
• binder_update_ref_for_handle(9), binder_dec_ref_for_handle(9), binder_inc_ref_for_node(9)
• binder_thread_dec_tmpref(9), binder_proc_dec_tmpref(9)
• binder_get_txn_from(9), binder_get_txn_from_and_acq_inner(9)
• binder_free_txn_fixups(9), binder_cleanup_transaction(9)
• binder_get_object(9), binder_validate_ptr(9), binder_validate_fixup(9)
• struct binder_task_work_cb(9), binder_do_fd_close(9), binder_deferred_fd_close(9)
• struct binder_ptr_fixup(9), struct binder_sg_copy(9)
• binder_do_deferred_txn_copies(9), binder_cleanup_deferred_txn_lists(9), binder_defer_copy(9), binder_add_fixup(9)
• binder_can_update_transaction(9), binder_find_outdated_transaction_ilocked(9)
• binder_get_node_refs_for_txn(9)
• binder_netlink_report(9)
• binder_free_buf(9), binder_apply_fd_fixups(9)
• print_next_binder_node_ilocked(9)

---

ngl bestie, there are a lot of binder functions. it's a whole ecosystem. do not attempt to memorize them all in one night, your brain deserves rest 🫶

---

and that's the whole page!! this one came from ./drivers/android, dated October 2026, and honestly? it ate. no cap. bye bestie 💖✨🎀