check_file_access 2905 src/fileio.c     return check_file_access (filename, Qfile_exists_p, F_OK);
check_file_access 2915 src/fileio.c     return check_file_access (filename, Qfile_executable_p, X_OK);
check_file_access 2923 src/fileio.c     return check_file_access (filename, Qfile_readable_p, R_OK);