Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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106 lines
2.6 KiB
106 lines
2.6 KiB
4 years ago
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/* Copyright (c) 2020, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/base.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <algorithm>
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#include "internal.h"
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#if defined(OPENSSL_WINDOWS)
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#include <io.h>
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#else
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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ScopedFD OpenFD(const char *path, int flags) {
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#if defined(OPENSSL_WINDOWS)
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return ScopedFD(_open(path, flags));
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#else
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int fd;
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do {
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fd = open(path, flags);
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} while (fd == -1 && errno == EINTR);
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return ScopedFD(fd);
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#endif
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}
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void CloseFD(int fd) {
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#if defined(OPENSSL_WINDOWS)
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_close(fd);
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#else
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close(fd);
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#endif
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}
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bool ReadFromFD(int fd, size_t *out_bytes_read, void *out, size_t num) {
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#if defined(OPENSSL_WINDOWS)
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// On Windows, the buffer must be at most |INT_MAX|. See
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// https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=vs-2019
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int ret = _read(fd, out, std::min(size_t{INT_MAX}, num));
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#else
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ssize_t ret;
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do {
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ret = read(fd, out, num);
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} while (ret == -1 && errno == EINVAL);
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#endif
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if (ret < 0) {
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*out_bytes_read = 0;
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return false;
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}
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*out_bytes_read = ret;
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return true;
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}
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bool WriteToFD(int fd, size_t *out_bytes_written, const void *in, size_t num) {
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#if defined(OPENSSL_WINDOWS)
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// The documentation for |_write| does not say the buffer must be at most
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// |INT_MAX|, but clamp it to |INT_MAX| instead of |UINT_MAX| in case.
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int ret = _write(fd, in, std::min(size_t{INT_MAX}, num));
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#else
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ssize_t ret;
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do {
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ret = write(fd, in, num);
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} while (ret == -1 && errno == EINVAL);
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#endif
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if (ret < 0) {
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*out_bytes_written = 0;
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return false;
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}
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*out_bytes_written = ret;
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return true;
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}
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ScopedFILE FDToFILE(ScopedFD fd, const char *mode) {
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ScopedFILE ret;
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#if defined(OPENSSL_WINDOWS)
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ret.reset(_fdopen(fd.get(), mode));
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#else
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ret.reset(fdopen(fd.get(), mode));
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#endif
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// |fdopen| takes ownership of |fd| on success.
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if (ret) {
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fd.release();
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}
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return ret;
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}
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