mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 10:40:03 +01:00
Ian Campbell
b7f76a699d
libxenevtchn will provide a stable API and ABI for accessing the evtchn device. The functions are moved into the xenevtchn namespace to make a clean break from libxc and avoid ambiguity regarding which interfaces are stable. All in-tree users are updated to use the new names. Upon request (via #define XC_WANT_COMPAT_EVTCHN_API) libxenctrl will provide a compat API for the old names. This is used by qemu-xen for the time being. qemu-xen-traditional is updated in lockstep. This leaves a few event channel related functions which go via privcmd (EVTCHNOP) rather than ioctls on the /dev/xen/evtchn device in libxenctrl. Specifically: - xc_evtchn_alloc_unbound - xc_evtchn_reset - xc_evtchn_status Note that xc_evtchn_alloc_unbound's functionality is also provided by xenevtchn_bind_unbound_port() (née xc_evtchn_bind_unbound_port) and is probably redundant. These functions do not appear to be needed by qemu-dm, qemu-pv (provision of device model to HVM guests and PV backends respectively) or by libvchan suggesting they are not needed by non-toolstack uses of event channels. QEMU does use these in hw/xenpv/xen_domainbuild.c but that is a "toolstack use". The new library uses a version script to ensure that only expected symbols are exported and to version them such that ABI guarantees can be kept in the future. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> [ ijc -- updated MINIOS_UPSTREAM_REVISION and QEMU_TRADITIONAL_REVISION ]
73 lines
1.6 KiB
C
73 lines
1.6 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;
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* version 2.1 of the License.
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include "private.h"
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xenevtchn_handle *xenevtchn_open(xentoollog_logger *logger, unsigned open_flags)
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{
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xenevtchn_handle *xce = malloc(sizeof(*xce));
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int rc;
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if (!xce) return NULL;
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xce->fd = -1;
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xce->logger = logger;
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xce->logger_tofree = NULL;
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if (!xce->logger) {
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xce->logger = xce->logger_tofree =
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(xentoollog_logger*)
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xtl_createlogger_stdiostream(stderr, XTL_PROGRESS, 0);
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if (!xce->logger) goto err;
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}
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rc = osdep_evtchn_open(xce);
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if ( rc < 0 ) goto err;
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return xce;
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err:
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osdep_evtchn_close(xce);
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xtl_logger_destroy(xce->logger_tofree);
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free(xce);
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return NULL;
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}
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int xenevtchn_close(xenevtchn_handle *xce)
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{
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int rc;
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if ( !xce )
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return 0;
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rc = osdep_evtchn_close(xce);
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xtl_logger_destroy(xce->logger_tofree);
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free(xce);
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return rc;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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