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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
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/*****************************************************************************
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* recvmsg.c: POSIX recvmsg() replacement
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*****************************************************************************
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* Copyright © 2016 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef _WIN32
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# include <errno.h>
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# include <stdlib.h>
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# include <mswsock.h>
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ssize_t recvmsg(int fd, struct msghdr *msg, int flags)
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{
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if (msg->msg_controllen != 0)
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{
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errno = ENOSYS;
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return -1;
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}
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if (msg->msg_iovlen > IOV_MAX)
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{
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errno = EINVAL;
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return -1;
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}
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WSABUF *buf = malloc(msg->msg_iovlen * sizeof (*buf));
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if (buf == NULL)
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return -1;
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for (unsigned i = 0; i < msg->msg_iovlen; i++)
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{
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buf[i].len = msg->msg_iov[i].iov_len;
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buf[i].buf = msg->msg_iov[i].iov_base;
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}
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DWORD dwFlags = flags;
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INT fromlen = msg->msg_namelen;
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DWORD rcvd;
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int ret = WSARecvFrom(fd, buf, msg->msg_iovlen, &rcvd, &dwFlags,
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msg->msg_name, &fromlen, NULL, NULL);
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free(buf);
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if (ret == 0)
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{
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msg->msg_namelen = fromlen;
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msg->msg_flags = dwFlags;
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return rcvd;
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}
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switch (WSAGetLastError())
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{
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case WSAEWOULDBLOCK:
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errno = EAGAIN;
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break;
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}
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return -1;
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}
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#endif
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