include/boost/corosio/native/detail/reactor/reactor_descriptor_ops.hpp
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| Line | TLA | Hits | Source Code |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2026 Michael Vandeberg | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/corosio | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_DESCRIPTOR_OPS_HPP | ||
| 11 | #define BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_DESCRIPTOR_OPS_HPP | ||
| 12 | |||
| 13 | #include <boost/corosio/detail/platform.hpp> | ||
| 14 | |||
| 15 | #if BOOST_COROSIO_POSIX | ||
| 16 | |||
| 17 | #include <cstddef> | ||
| 18 | |||
| 19 | #include <errno.h> | ||
| 20 | #include <sys/types.h> | ||
| 21 | #include <sys/uio.h> | ||
| 22 | #include <unistd.h> | ||
| 23 | |||
| 24 | namespace boost::corosio::detail { | ||
| 25 | |||
| 26 | /* Write policy shared by every reactor backend's descriptor ops. | ||
| 27 | |||
| 28 | Descriptors are not sockets: sendmsg() fails with ENOTSOCK on a pipe | ||
| 29 | or character device, so the write path is writev()/write() and | ||
| 30 | SIGPIPE suppression is structurally unavailable -- MSG_NOSIGNAL is a | ||
| 31 | send() flag and SO_NOSIGPIPE a socket option. A write to a pipe whose | ||
| 32 | read end has closed raises SIGPIPE, exactly as a plain write(2) | ||
| 33 | would; callers install SIG_IGN. | ||
| 34 | */ | ||
| 35 | struct descriptor_write_policy | ||
| 36 | { | ||
| 37 | 4x | static ssize_t write(int fd, iovec* iovecs, int count) noexcept | |
| 38 | { | ||
| 39 | ssize_t n; | ||
| 40 | do | ||
| 41 | { | ||
| 42 | 4x | n = ::writev(fd, iovecs, count); | |
| 43 | } | ||
| 44 | 4x | while (n < 0 && errno == EINTR); | |
| 45 | 4x | return n; | |
| 46 | } | ||
| 47 | |||
| 48 | // Single-buffer fast path: skips the kernel's iov_iter setup. | ||
| 49 | static ssize_t | ||
| 50 | 18x | write_one(int fd, void const* data, std::size_t size) noexcept | |
| 51 | { | ||
| 52 | ssize_t n; | ||
| 53 | do | ||
| 54 | { | ||
| 55 | 18x | n = ::write(fd, data, size); | |
| 56 | } | ||
| 57 | 18x | while (n < 0 && errno == EINTR); | |
| 58 | 18x | return n; | |
| 59 | } | ||
| 60 | }; | ||
| 61 | |||
| 62 | } // namespace boost::corosio::detail | ||
| 63 | |||
| 64 | #endif // BOOST_COROSIO_POSIX | ||
| 65 | |||
| 66 | #endif // BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_DESCRIPTOR_OPS_HPP | ||
| 67 |