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uuid: New macro UUID_ZERO for an all-zero expression or initializer.

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This is convenient in expressions, e.g. "uuid = x ? *x : UUID_ZERO;".

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Andy Zhou <azhou@ovn.org>
This commit is contained in:
Ben Pfaff
2016-11-11 15:47:54 -08:00
parent b5f0fe21a0
commit 42a1d93e29
2 changed files with 4 additions and 1 deletions
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lib/uuid.c
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@@ -115,7 +115,7 @@ uuid_set_bits_v4(struct uuid *uuid)
void
uuid_zero(struct uuid *uuid)
{
uuid->parts[0] = uuid->parts[1] = uuid->parts[2] = uuid->parts[3] = 0;
*uuid = UUID_ZERO;
}
/* Returns true if 'uuid' is all zero, otherwise false. */