2 * Copyright 2013 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "folly/FileUtil.h"
24 #include "folly/detail/FileUtilDetail.h"
28 using namespace fileutil_detail;
30 int openNoInt(const char* name, int flags, mode_t mode) {
31 return wrapNoInt(open, name, flags, mode);
34 int closeNoInt(int fd) {
36 // Ignore EINTR. On Linux, close() may only return EINTR after the file
37 // descriptor has been closed, so you must not retry close() on EINTR --
38 // in the best case, you'll get EBADF, and in the worst case, you'll end up
39 // closing a different file (one opened from another thread).
41 // Interestingly enough, the Single Unix Specification says that the state
42 // of the file descriptor is unspecified if close returns EINTR. In that
43 // case, the safe thing to do is also not to retry close() -- leaking a file
44 // descriptor is probably better than closing the wrong file.
45 if (r == -1 && errno == EINTR) {
51 int fsyncNoInt(int fd) {
52 return wrapNoInt(fsync, fd);
55 int fdatasyncNoInt(int fd) {
57 return wrapNoInt(fdatasync, fd);
59 return wrapNoInt(fcntl, fd, F_FULLFSYNC);
63 int ftruncateNoInt(int fd, off_t len) {
64 return wrapNoInt(ftruncate, fd, len);
67 int truncateNoInt(const char* path, off_t len) {
68 return wrapNoInt(truncate, path, len);
71 ssize_t readNoInt(int fd, void* buf, size_t count) {
72 return wrapNoInt(read, fd, buf, count);
75 ssize_t preadNoInt(int fd, void* buf, size_t count, off_t offset) {
76 return wrapNoInt(pread, fd, buf, count, offset);
79 ssize_t readvNoInt(int fd, const iovec* iov, int count) {
80 return wrapNoInt(writev, fd, iov, count);
83 ssize_t writeNoInt(int fd, const void* buf, size_t count) {
84 return wrapNoInt(write, fd, buf, count);
87 ssize_t pwriteNoInt(int fd, const void* buf, size_t count, off_t offset) {
88 return wrapNoInt(pwrite, fd, buf, count, offset);
91 ssize_t writevNoInt(int fd, const iovec* iov, int count) {
92 return wrapNoInt(writev, fd, iov, count);
95 ssize_t readFull(int fd, void* buf, size_t count) {
96 return wrapFull(read, fd, buf, count);
99 ssize_t preadFull(int fd, void* buf, size_t count, off_t offset) {
100 return wrapFull(pread, fd, buf, count, offset);
103 ssize_t writeFull(int fd, const void* buf, size_t count) {
104 return wrapFull(write, fd, const_cast<void*>(buf), count);
107 ssize_t pwriteFull(int fd, const void* buf, size_t count, off_t offset) {
108 return wrapFull(pwrite, fd, const_cast<void*>(buf), count, offset);
111 ssize_t readvFull(int fd, iovec* iov, int count) {
112 return wrapvFull(readv, fd, iov, count);
115 #ifdef FOLLY_HAVE_PREADV
116 ssize_t preadvFull(int fd, iovec* iov, int count, off_t offset) {
117 return wrapvFull(preadv, fd, iov, count, offset);
121 ssize_t writevFull(int fd, iovec* iov, int count) {
122 return wrapvFull(writev, fd, iov, count);
125 #ifdef FOLLY_HAVE_PWRITEV
126 ssize_t pwritevFull(int fd, iovec* iov, int count, off_t offset) {
127 return wrapvFull(pwritev, fd, iov, count, offset);