Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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105 lines
2.6 KiB
105 lines
2.6 KiB
/* 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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