From f31ecf671ddc498f20219453395794ff2383e06b Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 10 Jul 2023 16:14:37 -0600 Subject: io_uring: add IORING_OP_WAITID support This adds support for an async version of waitid(2), in a fully async version. If an event isn't immediately available, wait for a callback to trigger a retry. The format of the sqe is as follows: sqe->len The 'which', the idtype being queried/waited for. sqe->fd The 'pid' (or id) being waited for. sqe->file_index The 'options' being set. sqe->addr2 A pointer to siginfo_t, if any, being filled in. buf_index, add3, and waitid_flags are reserved/unused for now. waitid_flags will be used for options for this request type. One interesting use case may be to add multi-shot support, so that the request stays armed and posts a notification every time a monitored process state change occurs. Note that this does not support rusage, on Arnd's recommendation. See the waitid(2) man page for details on the arguments. Signed-off-by: Jens Axboe --- io_uring/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'io_uring/Makefile') diff --git a/io_uring/Makefile b/io_uring/Makefile index 8cc8e5387a75..7bd64e442567 100644 --- a/io_uring/Makefile +++ b/io_uring/Makefile @@ -7,5 +7,6 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \ openclose.o uring_cmd.o epoll.o \ statx.o net.o msg_ring.o timeout.o \ sqpoll.o fdinfo.o tctx.o poll.o \ - cancel.o kbuf.o rsrc.o rw.o opdef.o notif.o + cancel.o kbuf.o rsrc.o rw.o opdef.o \ + notif.o waitid.o obj-$(CONFIG_IO_WQ) += io-wq.o -- cgit v1.2.3