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#define STDIN_FD() 0
#define STDOUT_FD() 1
#define STDERR_FD() 2
S48_EXTERN int ps_open_fd(char *in_filename, psbool is_input, long *status);
S48_EXTERN int ps_close_fd(long fd_as_long);
S48_EXTERN psbool ps_check_fd(long fd_as_long, psbool is_read, long *status);
S48_EXTERN long ps_read_fd(long fd_as_long, char *buf_as_long, long max, psbool waitp,
psbool *eofp, psbool *pending, long *status);
S48_EXTERN long ps_write_fd(long fd_as_long, char *buf_as_long, long max,
psbool *pending, long *status);
S48_EXTERN long ps_abort_fd_op(long fd_as_long);
S48_EXTERN long ps_io_buffer_size(void);
S48_EXTERN psbool ps_io_crlf_p(void);
S48_EXTERN char *ps_console_encoding(long fd_as_long);
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