tioproc.h - plan9port - [fork] Plan 9 from user space
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       tioproc.h (201B)
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            1 #define ioproc_arg(io, type)        (va_arg((io)->arg, type))
            2 
            3 struct Ioproc
            4 {
            5         int tid;
            6         Channel *c, *creply;
            7         int inuse;
            8         long (*op)(va_list*);
            9         va_list arg;
           10         long ret;
           11         char err[ERRMAX];
           12         Ioproc *next;
           13 };