uio.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * you may not use this file except in compliance with the License. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * You may obtain a copy of the License at 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * See the License for the specific language governing permissions and 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * limitations under the License. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#ifndef HAVE_SYS_UIO_H 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <cutils/uio.h> 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint readv( int fd, struct iovec* vecs, int count ) 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int total = 0; 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project for ( ; count > 0; count--, vecs++ ) { 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project const char* buf = vecs->iov_base; 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int len = vecs->iov_len; 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (len > 0) { 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int ret = read( fd, buf, len ); 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (ret < 0) { 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (total == 0) 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project total = -1; 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto Exit; 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (ret == 0) 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto Exit; 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project total += ret; 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buf += ret; 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project len -= ret; 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source ProjectExit: 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return total; 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint writev( int fd, const struct iovec* vecs, int count ) 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int total = 0; 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project for ( ; count > 0; count--, vecs++ ) { 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project const char* buf = (const char*)vecs->iov_base; 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int len = (int)vecs->iov_len; 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (len > 0) { 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int ret = write( fd, buf, len ); 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (ret < 0) { 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (total == 0) 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project total = -1; 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto Exit; 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (ret == 0) 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project goto Exit; 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project total += ret; 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buf += ret; 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project len -= ret; 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source ProjectExit: 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return total; 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#endif /* !HAVE_SYS_UIO_H */ 77