shell bypass 403
/* src/include/port/win32_msvc/unistd.h */
/*
* MSVC does not define these, nor does _fileno(stdin) etc reliably work
* (returns -1 if stdin/out/err are closed).
*/
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2