mirror of
https://github.com/matrix-construct/construct
synced 2024-06-02 10:08:56 +02:00
124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk
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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 is present in all copies.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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// IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#define HAVE_IRCD_UTIL_SYSCALL_H
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// Declaring this here eliminates the need to include <unistd.h> for it
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extern "C" long syscall(long, ...) noexcept;
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namespace ircd::util
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{
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template<class function, class... args> long syscall(function&& f, args&&... a);
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template<long number, class... args> long syscall(args&&... a);
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template<class function, class... args> long syscall_nointr(function&& f, args&&... a);
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template<long number, class... args> long syscall_nointr(args&&... a);
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}
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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template<class function,
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class... args>
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long
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ircd::util::syscall(function&& f,
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args&&... a)
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{
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const auto ret
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{
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f(std::forward<args>(a)...)
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};
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if(unlikely(ret == -1))
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throw std::system_error
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{
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errno, std::system_category()
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};
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return ret;
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}
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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template<long number,
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class... args>
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long
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ircd::util::syscall(args&&... a)
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{
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const auto ret
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{
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::syscall(number, std::forward<args>(a)...)
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};
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if(unlikely(ret == -1))
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throw std::system_error
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{
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errno, std::system_category()
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};
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return ret;
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}
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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template<class function,
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class... args>
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long
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ircd::util::syscall_nointr(function&& f,
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args&&... a)
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{
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long ret; do
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{
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ret = f(std::forward<args>(a)...);
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}
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while(unlikely(ret == -1 && errno == EINTR));
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if(unlikely(ret == -1))
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throw std::system_error(errno, std::system_category());
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return ret;
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}
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//
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// Error-checking closure for POSIX system calls. Note the usage is
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// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
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//
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template<long number,
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class... args>
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long
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ircd::util::syscall_nointr(args&&... a)
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{
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long ret; do
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{
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ret = ::syscall(number, std::forward<args>(a)...);
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}
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while(unlikely(ret == -1 && errno == EINTR));
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if(unlikely(ret == -1))
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throw std::system_error(errno, std::system_category());
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return ret;
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}
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