| // Copyright 2020 The BoringSSL Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <openssl/base.h> |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdio.h> |
| |
| #include <algorithm> |
| |
| #include "internal.h" |
| |
| #if defined(OPENSSL_WINDOWS) |
| #include <io.h> |
| #else |
| #include <fcntl.h> |
| #include <unistd.h> |
| #endif |
| |
| |
| ScopedFD OpenFD(const char *path, int flags) { |
| #if defined(OPENSSL_WINDOWS) |
| return ScopedFD(_open(path, flags)); |
| #else |
| int fd; |
| do { |
| fd = open(path, flags); |
| } while (fd == -1 && errno == EINTR); |
| return ScopedFD(fd); |
| #endif |
| } |
| |
| void CloseFD(int fd) { |
| #if defined(OPENSSL_WINDOWS) |
| _close(fd); |
| #else |
| close(fd); |
| #endif |
| } |
| |
| bool ReadFromFD(int fd, size_t *out_bytes_read, void *out, size_t num) { |
| #if defined(OPENSSL_WINDOWS) |
| // On Windows, the buffer must be at most |INT_MAX|. See |
| // https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=vs-2019 |
| int ret = _read(fd, out, std::min(size_t{INT_MAX}, num)); |
| #else |
| ssize_t ret; |
| do { |
| ret = read(fd, out, num); |
| } while (ret == -1 && errno == EINVAL); |
| #endif |
| |
| if (ret < 0) { |
| *out_bytes_read = 0; |
| return false; |
| } |
| *out_bytes_read = ret; |
| return true; |
| } |
| |
| bool WriteToFD(int fd, size_t *out_bytes_written, const void *in, size_t num) { |
| #if defined(OPENSSL_WINDOWS) |
| // The documentation for |_write| does not say the buffer must be at most |
| // |INT_MAX|, but clamp it to |INT_MAX| instead of |UINT_MAX| in case. |
| int ret = _write(fd, in, std::min(size_t{INT_MAX}, num)); |
| #else |
| ssize_t ret; |
| do { |
| ret = write(fd, in, num); |
| } while (ret == -1 && errno == EINVAL); |
| #endif |
| |
| if (ret < 0) { |
| *out_bytes_written = 0; |
| return false; |
| } |
| *out_bytes_written = ret; |
| return true; |
| } |
| |
| ScopedFILE FDToFILE(ScopedFD fd, const char *mode) { |
| ScopedFILE ret; |
| #if defined(OPENSSL_WINDOWS) |
| ret.reset(_fdopen(fd.get(), mode)); |
| #else |
| ret.reset(fdopen(fd.get(), mode)); |
| #endif |
| // |fdopen| takes ownership of |fd| on success. |
| if (ret) { |
| fd.release(); |
| } |
| return ret; |
| } |