ref: 14c7edf96e287b10285069bc0ab7b9569ca7b4c3 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 gid) { errno = EPERM; return -1; }