1 /*
2 * linux_kaio.h
3 *
4 * This source file is part of the FoundationDB open source project
5 *
6 * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
7 *
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21 // AIO system calls
22
23 typedef struct io_context *io_context_t;
24
25 enum {
26 IO_CMD_PREAD = 0,
27 IO_CMD_PWRITE = 1,
28 IO_CMD_FSYNC = 2,
29 IO_CMD_FDSYNC = 3
30 };
31
32 struct linux_iocb {
33 void* data;
34 uint32_t key, unused;
35
36 uint16_t aio_lio_opcode;
37 uint16_t aio_reqprio;
38 uint32_t aio_fildes;
39
40 void* buf;
41 uint64_t nbytes;
42 int64_t offset;
43 uint64_t unused2;
44 uint32_t flags;
45 uint32_t eventfd;
46 };
47
48 struct linux_ioresult {
49 void* data;
50 linux_iocb* iocb;
51 unsigned long result;
52 unsigned long result2;
53 };
54
io_setup(unsigned nr_events,io_context_t * ctxp)55 static int io_setup(unsigned nr_events, io_context_t *ctxp) { return syscall( __NR_io_setup, nr_events, ctxp ); }
io_submit(io_context_t ctx_id,long nrstruct,linux_iocb ** iocbpp)56 static int io_submit(io_context_t ctx_id, long nrstruct, linux_iocb ** iocbpp ) { return syscall( __NR_io_submit, ctx_id, nrstruct, iocbpp ); }
io_getevents(io_context_t ctx_id,long min_nr,long nr,linux_ioresult * events,struct timespec * timeout)57 static int io_getevents(io_context_t ctx_id, long min_nr, long nr, linux_ioresult *events, struct timespec * timeout ) { return syscall( __NR_io_getevents, ctx_id, min_nr, nr, events, timeout ); }
58