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