Differential D6832 Diff 24597 src/ioslaves/file/sharefd_p.h

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src/ioslaves/file/sharefd_p.h

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		1		/***
		2		Copyright (C) 2017 by Chinmoy Ranjan Pradhan <chinmoyrp65@gmail.com>
		3
		4		This library is free software; you can redistribute it and/or
		5		modify it under the terms of the GNU Lesser General Public
		6		License as published by the Free Software Foundation; either
		7		version 2.1 of the License, or (at your option) version 3, or any
		8		later version accepted by the membership of KDE e.V. (or its
		9		successor approved by the membership of KDE e.V.), which shall
		10		act as a proxy defined in Section 6 of version 3 of the license.
		11
		12		This library is distributed in the hope that it will be useful,
		13		but WITHOUT ANY WARRANTY; without even the implied warranty of
		14		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		15		Lesser General Public License for more details.
		16
		17		You should have received a copy of the GNU Lesser General Public
		18		License along with this library. If not, see <http://www.gnu.org/licenses/>.
		19		***/
		20
		21		#include <sys/un.h>
		22		#include <iostream>
		23
		24		class SocketAddress
		25		{
		26		const sockaddr_un addr;
		27
		28		public:
		29		SocketAddress(const std::string &path)
		30		: addr(make_address(path))
		31		{
		32		}
		33
		34		int length() const
		35		{
		36		return sizeof addr;
		37		}
		38		const sockaddr *address() const
		39		{
		40		return reinterpret_cast<const sockaddr*>(&addr);
		41		}
		42
		43		private:
		44		static sockaddr_un make_address(const std::string& path)
		45		{
		46		sockaddr_un a{ AF_UNIX, {0}};
		47		std::string finalPath = "/tmp/" + path;
		48		#ifdef __linux__
		49		::strcpy(&a.sun_path[1], finalPath.c_str());
		50		#else
		51		::strcpy(a.sun_path, finalPath.c_str());
		52		::unlink(finalPath.c_str());
		53		#endif
		54		return a;
		55		}
		56		};
		57
		58		class FDMessageHeader
		59		{
		60		char io_buf[2];
		61		char cmsg_buf[CMSG_SPACE(sizeof(int))];
		62		iovec io;
		63		msghdr msg;
		64
		65		public:
		66		FDMessageHeader()
		67		: io_buf{0}
		68		, cmsg_buf{0}
		69		, io{io_buf, sizeof io_buf}
		70		, msg{nullptr, 0, &io, 1, &cmsg_buf, sizeof cmsg_buf, 0}
		71		{
		72		}
		73
		74		msghdr *message()
		75		{
		76		return &msg;
		77		}
		78
		79		cmsghdr *cmsgHeader()
		80		{
		81		return CMSG_FIRSTHDR(&msg);
		82		}
		83		};