Request an ssh-agent to list of public keys.
#include <libssh2.h>
int libssh2_agent_list_identities(LIBSSH2_AGENT *agent);
Request an ssh-agent to list of public keys, and stores them in the internal collection of the handle. Call libssh2_agent_get_identity(3) to get a public key off the collection.
Returns 0 if succeeded, or a negative value for error.
Added in libssh2 1.2