ref: 7f3cb2a9c5b740dc86c4ac4e3d4cb45bb2e69dac 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; }