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kaf24@firebug.cl.cam.ac.uk
c804adf4b6
tools. /dev/xen/evtchn is now used by daemons to connect to remote domains: the advantage is that the local ports are garbage collected automatically if the daemon dies. xen no longer constructs end-to-end event-channel port pairs -- it allocates an unbound port in new domU and writes that port to xenstore. It is then picked up by teh appropriate daemon which does interdomain bind via /dev/xen/evtchn. Signed-off-by: Keir Fraser <keir@xensource.com>
76 lines
1.2 KiB
C
76 lines
1.2 KiB
C
/*
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* pdb_xen.c
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*
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* alex ho
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* http://www.cl.cam.ac.uk/netos/pdb
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*
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* PDB interface library for accessing Xen
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*/
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#include <xenctrl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/mman.h>
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int
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pdb_open ()
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{
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int xc_handle = xc_interface_open();
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if ( xc_handle < 0 )
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{
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fprintf(stderr, "(pdb) error opening xc interface: %d (%s)\n",
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errno, strerror(errno));
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}
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return xc_handle;
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}
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int
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pdb_close (int xc_handle)
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{
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int rc;
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if ( (rc = xc_interface_close(xc_handle)) < 0 )
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{
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fprintf(stderr, "(pdb) error closing xc interface: %d (%s)\n",
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errno, strerror(errno));
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}
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return rc;
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}
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#include <sys/ioctl.h>
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#include <xen/linux/evtchn.h>
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int
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xen_evtchn_bind (int evtchn_fd, int idx)
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{
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if ( ioctl(evtchn_fd, EVTCHN_BIND, idx) != 0 )
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return -errno;
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return 0;
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}
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int
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xen_evtchn_unbind (int evtchn_fd, int idx)
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{
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if ( ioctl(evtchn_fd, EVTCHN_UNBIND, idx) != 0 )
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return -errno;
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return 0;
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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-set-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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