libssh2_knownhost_readfile man page
libssh2_knownhost_readfile — parse a file of known hosts
int libssh2_knownhost_readfile(LIBSSH2_KNOWNHOSTS *hosts,
const char *filename, int type);
Reads a collection of known hosts from a specified file and adds them to the collection of known hosts.
filename specifies which file to read
type specifies what file type it is, and LIBSSH2_KNOWNHOST_FILE_OPENSSH is the only currently supported format. This file is normally found named ~/.ssh/known_hosts
Returns a negative value, a regular libssh2 error code for errors, or a positive number as number of parsed known hosts in the file.
Added in libssh2 1.2
libssh2_knownhost_init(3) libssh2_knownhost_free(3) libssh2_knownhost_check(3)
libssh2_knownhost_get(3), libssh2_knownhost_readline(3), libssh2_knownhost_writefile(3).