uintptr(unsafe.Pointer(buf)),
		size,
		uintptr(unsafe.Pointer(result)),
		0)
	return syscall.Errno(errno)
}

//go:cgo_import_dynamic libc_getgrnam_r getgrnam_r  "/usr/lib/libSystem.B.dylib"
func libc_getgrnam_r_trampoline()

func Getgrnam(name *byte, grp *Group, buf *byte, size uintptr, result **Group) syscall.Errno {
	// Note: Returns an errno as its actual result, not in global errno.

	*perr = getgrgid_r(gid, &grp, buf, buflen, &result);
	*found = result != NULL;
	return grp;
}

static struct group mygetgrnam_r(const char *name, char *buf, size_t buflen, int *found, int *perr) {
	struct group grp;
	struct group *result;
	memset(&grp, 0, sizeof(grp));
	*perr = getgrnam_r(name, &grp, buf, buflen, &result);
	*found = result != NULL;
	return grp;
}
*/
import "C"

type _C_char = C.char

resolving user and group ids to names, and listing supplementary group IDs.
One is written in pure Go and parses /etc/passwd and /etc/group. The other
is cgo-based and relies on the standard C library (libc) routines such as
getpwuid_r, getgrnam_r, and getgrouplist.

When cgo is available, and the required routines are implemented in libc
for a particular platform, cgo-based (libc-backed) code is used.
This can be overridden by using osusergo build tag, which enforces

	return pwd, result != nil, errno
}

func _C_getgrnam_r(name *_C_char, buf *_C_char, size _C_size_t) (grp _C_struct_group, found bool, errno syscall.Errno) {
	var result *_C_struct_group
	errno = unix.Getgrnam(name, &grp, buf, size, &result)
	return grp, result != nil, errno
}

func _C_getgrgid_r(gid _C_gid_t, buf *_C_char, size _C_size_t) (grp _C_struct_group, found bool, errno syscall.Errno) {
	var result *_C_struct_group