int flux_response_decode (const flux_msg_t *msg, const char **topic, const char **s);
int flux_response_decode_raw (const flux_msg_t *msg, const char **topic, const void **data, int *len);
int flux_response_decode_error (const flux_msg_t *msg, const char *errstr);
flux_response_decode() decodes a response message msg.
topic, if non-NULL, will be set to the message's topic string. The storage for this string belongs to msg and should not be freed.
s, if non-NULL, will be set to the message's NULL-terminated string payload. If no payload exists, it is set to NULL. The storage for this string belongs to msg and should not be freed.
flux_response_decode_raw() decodes a response message with a raw payload,
setting data and len to the payload data and length. The storage for
the raw payload belongs to msg and should not be freed.
flux_response_decode_error() decodes an optional error string included
with an error response. This fails if the response is not an error,
or does not include an error string payload.
These functions return 0 on success. On error, -1 is returned, and errno is set appropriately.
The msg argument was NULL.
Message decoding failed, such as due to incorrect message type, missing topic string, etc..
flux_response_decode_error()was called on a message with no error response payload.