libssh2_agent_get_identity man page
libssh2_agent_get_identity — get a public key off the collection of public keys managed by ssh-agent
int libssh2_agent_get_identity(LIBSSH2_AGENT *agent,
struct libssh2_agent_publickey **store,
struct libssh2_agent_publickey *prev);
libssh2_agent_get_identity(3) allows an application to iterate over all public keys in the collection managed by ssh-agent.
store should point to a pointer that gets filled in to point to the public key data.
prev is a pointer to a previous 'struct libssh2_agent_publickey' as returned by a previous invoke of this function, or NULL to get the first entry in the internal collection.
Returns 0 if everything is fine and information about a host was stored in the store struct.
Returns 1 if it reached the end of public keys.
Returns negative values for error
Added in libssh2 1.2