129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <strings.h>
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#include "misc.h"
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int
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pdwait(int pfd)
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{
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fd_set fdset;
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FD_ZERO(&fdset);
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FD_SET(pfd, &fdset);
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return (select(pfd + 1, NULL, &fdset, NULL, NULL) == -1 ? -1 : 0);
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}
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int
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descriptor_send(int sock, int fd)
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{
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unsigned char ctrl[CMSG_SPACE(sizeof(fd))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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assert(sock >= 0);
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assert(fd >= 0);
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bzero(&msg, sizeof(msg));
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bzero(&ctrl, sizeof(ctrl));
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msg.msg_iov = NULL;
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msg.msg_iovlen = 0;
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msg.msg_control = ctrl;
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msg.msg_controllen = sizeof(ctrl);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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bcopy(&fd, CMSG_DATA(cmsg), sizeof(fd));
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if (sendmsg(sock, &msg, 0) == -1)
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return (errno);
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return (0);
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}
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int
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descriptor_recv(int sock, int *fdp)
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{
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unsigned char ctrl[CMSG_SPACE(sizeof(*fdp))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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int val;
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assert(sock >= 0);
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assert(fdp != NULL);
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bzero(&msg, sizeof(msg));
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bzero(&ctrl, sizeof(ctrl));
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#if 1
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/*
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* This doesn't really make sense, as we don't plan to receive any
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* data, but if no buffer is provided and recv(2) returns 0 without
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* control message. Must be kernel bug.
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*/
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iov.iov_base = &val;
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iov.iov_len = sizeof(val);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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#else
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msg.msg_iov = NULL;
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msg.msg_iovlen = 0;
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#endif
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msg.msg_control = ctrl;
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msg.msg_controllen = sizeof(ctrl);
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if (recvmsg(sock, &msg, 0) == -1)
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return (errno);
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS) {
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return (EINVAL);
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}
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bcopy(CMSG_DATA(cmsg), fdp, sizeof(*fdp));
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return (0);
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}
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