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05a38d4c4a
Remove many imports of sys/ioctl.h which are redundant, and conditionalize remaining usage that needs to compile on Windows platforms. The previous change to remove the "nonblocking" gnulib module indirectly caused the loss of the "ioctl" gnulib module that we did not explicitly list in bootstrap.conf despite relying on. Rather than re-introduce the "ioctl" module this patch makes it redundant. Reviewed-by: Pavel Hrdina <phrdina@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* 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
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#if HAVE_DECL_VHOST_VSOCK_SET_GUEST_CID
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# include <linux/vhost.h>
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#endif
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#include "virvsock.h"
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#include "virerror.h"
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#include "virlog.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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VIR_LOG_INIT("util.vsock");
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#if HAVE_DECL_VHOST_VSOCK_SET_GUEST_CID
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static int
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virVsockSetGuestCidQuiet(int fd,
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unsigned int guest_cid)
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{
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uint64_t val = guest_cid;
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return ioctl(fd, VHOST_VSOCK_SET_GUEST_CID, &val);
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}
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#else
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static int
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virVsockSetGuestCidQuiet(int fd G_GNUC_UNUSED,
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unsigned int guest_cid G_GNUC_UNUSED)
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{
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errno = ENOSYS;
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return -1;
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}
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#endif
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/**
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* virVsockSetGuestCid:
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* @fd: file descriptor of a vsock interface
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* @guest_cid: guest CID to be set
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*
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* Wrapper for VHOST_VSOCK_SET_GUEST_CID ioctl.
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* Returns: 0 on success, -1 on error.
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*/
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int
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virVsockSetGuestCid(int fd,
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unsigned int guest_cid)
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{
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if (virVsockSetGuestCidQuiet(fd, guest_cid) < 0) {
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virReportSystemError(errno, "%s",
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_("failed to set guest cid"));
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return -1;
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}
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return 0;
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}
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#define VIR_VSOCK_GUEST_CID_MIN 3
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/**
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* virVsockAcquireGuestCid:
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* @fd: file descriptor of a vsock interface
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* @guest_cid: where to store the guest CID
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*
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* Iterates over usable CIDs until a free one is found.
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* Returns: 0 on success, with the acquired CID stored in guest_cid
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* -1 on error.
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*/
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int
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virVsockAcquireGuestCid(int fd,
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unsigned int *guest_cid)
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{
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unsigned int cid = VIR_VSOCK_GUEST_CID_MIN;
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for (; virVsockSetGuestCidQuiet(fd, cid) < 0; cid++) {
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if (errno != EADDRINUSE) {
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virReportSystemError(errno, "%s",
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_("failed to acquire guest cid"));
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return -1;
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}
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}
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*guest_cid = cid;
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return 0;
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}
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