socket_send_fd.c
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2014 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h> // for errno
#include <unistd.h>
#include <fcntl.h>
#include "tr/socket.h"
#include "tr/logger.h"
void
TR_socketSendFd(TR_Socket this, int fd)
{
struct msghdr msg;
struct cmsghdr * cmsg;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
memset(&msg, 0, sizeof(msg));
msg.msg_control = cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf); // necessary for CMSG_FIRSTHDR to
// return the correct value
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
msg.msg_controllen = cmsg->cmsg_len; // total size of all control blocks
sendmsg(TR_socketHandle(this), &msg, 0);
/* TODO error handling... */
}
// vim: set ts=4 sw=4: