Update contrib/restricted/boost/filesystem and contrib/restricted/boost/io to 1.79.0

1 files changed, 64 insertions, 0 deletions

diff --git a/contrib/restricted/boost/filesystem/src/posix_tools.hpp b/contrib/restricted/boost/filesystem/src/posix_tools.hpp
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+++ b/contrib/restricted/boost/filesystem/src/posix_tools.hpp
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+//  posix_tools.hpp  -------------------------------------------------------------------//
+
+//  Copyright 2021 Andrey Semashev
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+//  See library home page at http://www.boost.org/libs/filesystem
+
+//--------------------------------------------------------------------------------------//
+
+#ifndef BOOST_FILESYSTEM_SRC_POSIX_TOOLS_HPP_
+#define BOOST_FILESYSTEM_SRC_POSIX_TOOLS_HPP_
+
+#include "platform_config.hpp"
+#include <cerrno>
+#include <boost/filesystem/config.hpp>
+#ifdef BOOST_HAS_UNISTD_H
+#include <unistd.h>
+#endif
+
+namespace boost {
+namespace filesystem {
+namespace detail {
+
+/*!
+ * Closes a file descriptor and returns the result, similar to close(2). Unlike close(2), guarantees that the file descriptor is closed even if EINTR error happens.
+ *
+ * Some systems don't close the file descriptor in case if the thread is interrupted by a signal and close(2) returns EINTR.
+ * Other (most) systems do close the file descriptor even when when close(2) returns EINTR, and attempting to close it
+ * again could close a different file descriptor that was opened by a different thread. This function hides this difference in behavior.
+ *
+ * Future POSIX standards will likely fix this by introducing posix_close (see https://www.austingroupbugs.net/view.php?id=529)
+ * and prohibiting returning EINTR from close(2), but we still have to support older systems where this new behavior is not available and close(2)
+ * behaves differently between systems.
+ */
+inline int close_fd(int fd)
+{
+#if defined(hpux) || defined(_hpux) || defined(__hpux)
+    int res;
+    while (true)
+    {
+        res = ::close(fd);
+        if (BOOST_UNLIKELY(res < 0))
+        {
+            int err = errno;
+            if (err == EINTR)
+                continue;
+        }
+
+        break;
+    }
+
+    return res;
+#else
+    return ::close(fd);
+#endif
+}
+
+} // namespace detail
+} // namespace filesystem
+} // namespace boost
+
+#endif // BOOST_FILESYSTEM_SRC_POSIX_TOOLS_HPP_