#ifndef ISO
type {struct group}
element {struct group} {char*} gr_name
element {struct group} gid_t gr_gid
element {struct group} {char**} gr_mem

# ifndef POSIX
type gid_t
# endif

function {struct group*} getgrgid (gid_t)
function {struct group*} getgrnam (const char*)
# ifndef POSIX
function int getgrgid_r (gid_t, struct group*, char *, size_t, struct group**)
function int getgrnam_r (const char *, struct group *, char *, size_t, struct group**)
function {struct group*} getgrent (void)
function void endgrent (void)
function void setgrent (void)
# endif

allow gr_
#endif