1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <asyncio/AsyncIO.h> 18 #include <sys/syscall.h> 19 #include <unistd.h> 20 21 int io_setup(unsigned nr, aio_context_t* ctxp) { 22 memset(ctxp, 0, sizeof(*ctxp)); 23 return syscall(__NR_io_setup, nr, ctxp); 24 } 25 26 int io_destroy(aio_context_t ctx) { 27 return syscall(__NR_io_destroy, ctx); 28 } 29 30 int io_submit(aio_context_t ctx, long nr, iocb** iocbpp) { 31 return syscall(__NR_io_submit, ctx, nr, iocbpp); 32 } 33 34 int io_getevents(aio_context_t ctx, long min_nr, long max_nr, io_event* events, timespec* timeout) { 35 return syscall(__NR_io_getevents, ctx, min_nr, max_nr, events, timeout); 36 } 37 38 int io_cancel(aio_context_t ctx, iocb* iocbp, io_event* result) { 39 return syscall(__NR_io_cancel, ctx, iocbp, result); 40 } 41 42 void io_prep(iocb* iocb, int fd, const void* buf, uint64_t count, int64_t offset, bool read) { 43 memset(iocb, 0, sizeof(*iocb)); 44 iocb->aio_fildes = fd; 45 iocb->aio_lio_opcode = read ? IOCB_CMD_PREAD : IOCB_CMD_PWRITE; 46 iocb->aio_reqprio = 0; 47 iocb->aio_buf = reinterpret_cast<uint64_t>(buf); 48 iocb->aio_nbytes = count; 49 iocb->aio_offset = offset; 50 } 51
