ref: c1d40df49550393f3afe53fb6e6d500dfa8eb7a8
dir: /sys/src/ape/lib/ap/plan9/umask.c/
#include <sys/types.h> #include <sys/stat.h> #include <errno.h> /* * No such concept in plan9, but supposed to be always successful */ mode_t umask(mode_t) { return 0; }