9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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dup.c (136B)

      1 #include <u.h>
      2 #include <libc.h>
      3 
      4 #undef dup
      5 
      6 int
      7 p9dup(int old, int new)
      8 {
      9 	if(new == -1)
     10 		return dup(old);
     11 	return dup2(old, new);
     12 }