* mesg -- set current tty to accept or
* forbid write permission.
if(stat(tty
, &sbuf
) < 0) error("cannot stat");
fprintf(stderr
,"is y\n");
fprintf(stderr
,"is n\n");
} else switch(*argv
[1]) {
newmode(0600); r
=1; break;
error("usage: mesg [y] [n]");
fprintf(stderr
,"mesg: %s\n",s
);
error("cannot change mode");