#include <pwd.h>

#define T(t) (t*)0;

#define F(t,n) {t *y = &x.;;}

static void f()

{

T(gid_t)

T(uid_t)

T(size_t)

{

struct passwd x;

F(char*,pw_name)

F(uid_t,pw_uid)

F(gid_t,pw_gid)

F(char*,pw_dir)

F(char*,pw_shell)

}

{struct passwd*(*p)(const char*) = getpwnam;}

{int(*p)(const char*,struct passwd*,char*,size_t,struct passwd**) = getpwnam_r;}

{struct passwd*(*p)(uid_t) = getpwuid;}

{int(*p)(uid_t,struct passwd*,char*,size_t,struct passwd**) = getpwuid_r;}

#ifdef _XOPEN_SOURCE

{void(*p)(void) = endpwent;}

{struct passwd*(*p)(void) = getpwent;}

{void(*p)(void) = setpwent;}

#endif

}