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platform: add nm_platform_ip_address_cmp_expiry()

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This compares two addresses and returns which one has a longer
remaining life (i.e. a later expiry timestamp).

Signed-off-by: Thomas Haller <thaller@redhat.com>
This commit is contained in:
Thomas Haller 2014-04-03 11:42:00 +02:00
parent a8c17a2517
commit 9cd7b40a04
2 changed files with 53 additions and 1 deletions
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52
src/platform/nm-platform.c
View file

@ -2339,10 +2339,60 @@ nm_platform_ip6_route_cmp (const NMPlatformIP6Route *a, const NMPlatformIP6Route
return 0;
}
#undef _CMP_POINTER
#undef _CMP_FIELD
#undef _CMP_FIELD_MEMCMP
/**
* nm_platform_ip_address_cmp_expiry:
* @a: a NMPlatformIPAddress to compare
* @b: the other NMPlatformIPAddress to compare
*
* Compares two addresses and returns which one has a longer remaining lifetime.
* If both addresses have the same lifetime, look at the remaining preferred time.
*
* For comparison, only the timestamp, lifetime and preferred fields are considered.
* If they compare equal (== 0), their other fields were not considered.
*
* Returns: -1, 0, or 1 according to the comparison
**/
int
nm_platform_ip_address_cmp_expiry (const NMPlatformIPAddress *a, const NMPlatformIPAddress *b)
{
gint64 ta, tb;
_CMP_POINTER (a, b);
if (a->lifetime == NM_PLATFORM_LIFETIME_PERMANENT || a->lifetime == 0)
ta = G_MAXINT64;
else
ta = ((gint64) a->timestamp) + a->lifetime;
if (b->lifetime == NM_PLATFORM_LIFETIME_PERMANENT || b->lifetime == 0)
tb = G_MAXINT64;
else
tb = ((gint64) b->timestamp) + b->lifetime;
if (ta == tb) {
/* if the lifetime is equal, compare the preferred time. */
if (a->preferred == NM_PLATFORM_LIFETIME_PERMANENT || a->lifetime == 0 /* liftime==0 means permanent! */)
ta = G_MAXINT64;
else
ta = ((gint64) a->timestamp) + a->preferred;
if (b->preferred == NM_PLATFORM_LIFETIME_PERMANENT|| b->lifetime == 0)
tb = G_MAXINT64;
else
tb = ((gint64) b->timestamp) + b->preferred;
if (ta == tb)
return 0;
}
return ta < tb ? -1 : 1;
}
#undef _CMP_POINTER
static const char *
_change_type_to_string (NMPlatformSignalChangeType change_type)

2
src/platform/nm-platform.h
View file

@ -596,6 +596,8 @@ gboolean nm_platform_check_support_kernel_extended_ifa_flags (void);
void nm_platform_addr_flags2str (int flags, char *buf, size_t size);
int nm_platform_ip_address_cmp_expiry (const NMPlatformIPAddress *a, const NMPlatformIPAddress *b);
#define auto_g_free __attribute__((cleanup(put_g_free)))
static void __attribute__((unused))
put_g_free (void *ptr)