tdebug.c - plan9port - [fork] Plan 9 from user space
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       ---
       tdebug.c (206B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <draw.h>
            4 
            5 void
            6 drawsetdebug(int v)
            7 {
            8         uchar *a;
            9         a = bufimage(display, 1+1);
           10         if(a == 0){
           11                 fprint(2, "drawsetdebug: %r\n");
           12                 return;
           13         }
           14         a[0] = 'D';
           15         a[1] = v;
           16 }