ref: 2d976ec561716a5ae1ac0739b32b30bc80fd21e9 dir: /sys/src/ape/lib/ap/plan9/setgid.c/
#include <sys/types.h> #include <unistd.h> #include <errno.h> /* * BUG: never works */ int setgid(gid_t) { errno = EPERM; return -1; }