diff options
Diffstat (limited to 'src/nng.h')
| -rw-r--r-- | src/nng.h | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -270,9 +270,11 @@ NNG_DECL int nng_pipe_close(nng_pipe_t); * assigned in the lower 4 bits. * * There are gaps in the list, which are obsolete or unsupported protocols. - * For now we assume that protocol numbers are never more than 16 bits. + * Protocol numbers are never more than 16 bits. Also, there will never be + * a valid protocol numbered 0 (NNG_PROTO_NONE). */ #define NNG_PROTO(major, minor) (((major) * 16) + (minor)) +#define NNG_PROTO_NONE NNG_PROTO(0, 0) #define NNG_PROTO_PAIR NNG_PROTO(1, 0) #define NNG_PROTO_PUB NNG_PROTO(2, 0) #define NNG_PROTO_SUB NNG_PROTO(2, 1) |