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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 <axboe@kernel.dk>
15 lines
484 B
C
15 lines
484 B
C
// SPDX-License-Identifier: GPL-2.0
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#include "../kernel/exit.h"
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struct io_waitid_async {
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struct io_kiocb *req;
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struct wait_opts wo;
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};
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int io_waitid_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_waitid(struct io_kiocb *req, unsigned int issue_flags);
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int io_waitid_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
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unsigned int issue_flags);
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bool io_waitid_remove_all(struct io_ring_ctx *ctx, struct task_struct *task,
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bool cancel_all);
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