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virnetdevtap: add virNetDevTapGetName

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This will be used on a tap file descriptor returned by the bridge helper
to populate the <target> element, because the helper does not provide
the interface name.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-04-20 11:11:24 +02:00 committed by Eric Blake
parent a12475bd44
commit 740d98a17d
3 changed files with 38 additions and 0 deletions
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1
src/libvirt_private.syms
View File

@ -1533,6 +1533,7 @@ virNetDevOpenvswitchSetMigrateData;
virNetDevTapCreate;
virNetDevTapCreateInBridgePort;
virNetDevTapDelete;
virNetDevTapGetName;
# util/virnetdevveth.h

34
src/util/virnetdevtap.c
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@ -42,6 +42,40 @@
#define VIR_FROM_THIS VIR_FROM_NONE
/**
* virNetDevTapGetName:
* @tapfd: a tun/tap file descriptor
* @ifname: a pointer that will receive the interface name
*
* Retrieve the interface name given a file descriptor for a tun/tap
* interface.
*
* Returns 0 if the interface name is successfully queried, -1 otherwise
*/
int
virNetDevTapGetName(int tapfd, char **ifname)
{
#ifdef TUNGETIFF
struct ifreq ifr;
if (ioctl(tapfd, TUNGETIFF, &ifr) < 0) {
virReportSystemError(errno, "%s",
_("Unable to query tap interface name"));
return -1;
}
*ifname = strdup(ifr.ifr_name);
if (*ifname == NULL) {
virReportOOMError();
return -1;
}
return 0;
#else
return -1;
#endif
}
/**
* virNetDevProbeVnetHdr:
* @tapfd: a tun/tap file descriptor

3
src/util/virnetdevtap.h
View File

@ -35,6 +35,9 @@ int virNetDevTapCreate(char **ifname,
int virNetDevTapDelete(const char *ifname)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
int virNetDevTapGetName(int tapfd, char **ifname)
ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
typedef enum {
VIR_NETDEV_TAP_CREATE_NONE = 0,
/* Bring the interface up */