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68ec9d4a0f
On Windows the filesystem is not case sensitive and this will link just fine. However, the Windows SDK provides the import library with the lowercase name. Adjust the name so that the link actually succeeds on case-sensitive file systems (like on Linux). This fixes the Windows cross-compile.
118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
//===--- Random.cpp -------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// swift_stdlib_random
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//
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// Should the implementation of this function add a new platform/change for a
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// platform, make sure to also update the documentation regarding platform
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// implementation of this function.
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// This can be found at: /docs/Random.md
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#if defined(_WIN32) && !defined(__CYGWIN__)
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#define WIN32_LEAN_AND_MEAN
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#include <Windows.h>
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#include <Bcrypt.h>
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#pragma comment(lib, "bcrypt.lib")
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#else
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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#if __has_include(<sys/random.h>)
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#include <sys/random.h>
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#endif
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#include <sys/stat.h>
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#if __has_include(<sys/syscall.h>)
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#include <sys/syscall.h>
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#endif
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#include <stdlib.h>
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#include "swift/Runtime/Debug.h"
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#include "swift/Runtime/Mutex.h"
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#include "../SwiftShims/Random.h"
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#if defined(__APPLE__)
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SWIFT_RUNTIME_STDLIB_API
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void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
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arc4random_buf(buf, nbytes);
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}
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#elif defined(_WIN32) && !defined(__CYGWIN__)
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#warning TODO: Test swift_stdlib_random on Windows
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SWIFT_RUNTIME_STDLIB_API
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void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
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NTSTATUS status = BCryptGenRandom(nullptr,
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static_cast<PUCHAR>(buf),
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static_cast<ULONG>(nbytes),
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BCRYPT_USE_SYSTEM_PREFERRED_RNG);
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if (!BCRYPT_SUCCESS(status)) {
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fatalError(0, "Fatal error: 0x%.8X in '%s'\n", status, __func__);
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}
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}
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#else
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#undef WHILE_EINTR
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#define WHILE_EINTR(expression) ({ \
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decltype(expression) result = -1; \
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do { result = (expression); } while (result == -1 && errno == EINTR); \
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result; \
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})
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SWIFT_RUNTIME_STDLIB_API
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void swift::swift_stdlib_random(void *buf, __swift_size_t nbytes) {
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while (nbytes > 0) {
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__swift_ssize_t actual_nbytes = -1;
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#if defined(__NR_getrandom)
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static const bool getrandom_available =
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!(syscall(__NR_getrandom, nullptr, 0, 0) == -1 && errno == ENOSYS);
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if (getrandom_available) {
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actual_nbytes = WHILE_EINTR(syscall(__NR_getrandom, buf, nbytes, 0));
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}
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#elif __has_include(<sys/random.h>) && (defined(__CYGWIN__) || defined(__Fuchsia__))
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__swift_size_t getentropy_nbytes = std::min(nbytes, __swift_size_t{256});
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if (0 == getentropy(buf, getentropy_nbytes)) {
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actual_nbytes = getentropy_nbytes;
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}
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#endif
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if (actual_nbytes == -1) {
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static const int fd =
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WHILE_EINTR(open("/dev/urandom", O_RDONLY | O_CLOEXEC, 0));
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if (fd != -1) {
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static StaticMutex mutex;
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mutex.withLock([&] {
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actual_nbytes = WHILE_EINTR(read(fd, buf, nbytes));
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});
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}
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}
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if (actual_nbytes == -1) {
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fatalError(0, "Fatal error: %d in '%s'\n", errno, __func__);
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}
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buf = static_cast<uint8_t *>(buf) + actual_nbytes;
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nbytes -= actual_nbytes;
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}
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}
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#endif
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