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/* $Id: rwfd.c,v 1.3 2001/02/16 22:25:21 ericp Exp $ */
/*
*
* Copyright (C) 2000 David Mazieres (dm@uun.org)
*
* 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 2, 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "sysconf.h"
#if !defined (HAVE_ACCRIGHTS) && !defined (HAVE_CMSGHDR)
#error Do not know how to pass file descriptors
#endif /* !HAVE_ACCRIGHTS && !HAVE_CMSGHDR */
ssize_t
writevfd (int fd, const struct iovec *iov, int iovcnt, int wfd)
{
struct msghdr mh;
#ifdef HAVE_CMSGHDR
char cmhbuf[sizeof (struct cmsghdr) + sizeof (int)];
struct cmsghdr *const cmh = (struct cmsghdr *) cmhbuf;
int *const fdp = (int *) (cmhbuf + sizeof (struct cmsghdr));
#else /* !HAVE_CMSGHDR */
int fdp[1];
#endif /* !HAVE_CMSGHDR */
*fdp = wfd;
bzero (&mh, sizeof mh);
mh.msg_iov = (struct iovec *) iov;
mh.msg_iovlen = iovcnt;
#ifdef HAVE_CMSGHDR
mh.msg_control = (char *) cmh;
mh.msg_controllen = cmh->cmsg_len = sizeof (cmhbuf) /* + sizeof (int) */;
cmh->cmsg_level = SOL_SOCKET;
cmh->cmsg_type = SCM_RIGHTS;
#else /* !HAVE_CMSGHDR */
mh.msg_accrights = (char *) fdp;
mh.msg_accrightslen = sizeof (fdp);
#endif /* !HAVE_CMSGHDR */
return sendmsg (fd, &mh, 0);
}
ssize_t
writefd (int fd, const void *buf, size_t len, int wfd)
{
struct iovec iov[1];
iov->iov_base = (void *) buf;
iov->iov_len = len;
return writevfd (fd, iov, 1, wfd);
}
ssize_t
readvfd (int fd, const struct iovec *iov, int iovcnt, int *rfdp)
{
struct msghdr mh;
#ifdef HAVE_CMSGHDR
char cmhbuf[sizeof (struct cmsghdr) + sizeof (int)];
struct cmsghdr *const cmh = (struct cmsghdr *) cmhbuf;
int *const fdp = (int *) (cmhbuf + sizeof (struct cmsghdr));
#else /* !HAVE_CMSGHDR */
int fdp[1];
#endif /* !HAVE_CMSGHDR */
int n;
*fdp = -1;
bzero (&mh, sizeof mh);
mh.msg_iov = (struct iovec *) iov;
mh.msg_iovlen = iovcnt;
#ifdef HAVE_CMSGHDR
mh.msg_control = (char *) cmh;
mh.msg_controllen = cmh->cmsg_len = sizeof (cmhbuf) /* + sizeof (int) */;
cmh->cmsg_level = SOL_SOCKET;
cmh->cmsg_type = SCM_RIGHTS;
#else /* !HAVE_CMSGHDR */
mh.msg_accrights = (char *) fdp;
mh.msg_accrightslen = sizeof (fdp);
#endif /* !HAVE_CMSGHDR */
n = recvmsg (fd, &mh, 0);
*rfdp = *fdp;
if (*fdp >= 0 && n == 0) {
n = -1;
errno = EAGAIN;
}
return n;
}
ssize_t
readfd (int fd, void *buf, size_t len, int *rfdp)
{
struct iovec iov[1];
iov->iov_base = buf;
iov->iov_len = len;
return readvfd (fd, iov, 1, rfdp);
}
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