ref: 7c7c7a23512be8c2f3100b61a5ea95f1d5e76d93 dir: /sys/src/ape/lib/ap/plan9/getgroups.c/
#include <sys/types.h> #include <unistd.h> #include <errno.h> int getgroups(int, gid_t*) { errno = EINVAL; return -1; }