tdup.c - plan9port - [fork] Plan 9 from user space
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       ---
       tdup.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 }