ref: 9d471caaae56a734728c3b19755adfe26f6c4f4c
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 numask)
{
return 0;
}