typedef struct __iobuf FILE;

struct __iobuf {
	unsigned char        *_ptr;         /* next character position */
	int                   _cnt;         /* number of characters left */
	struct __stream_link *_link;        /* location of associated struct */
	unsigned              _flag;        /* mode of file access */
	int                   _handle;      /* file handle */
	unsigned              _bufsize;     /* size of buffer */
	unsigned short        _ungotten;    /* used by ungetc and ungetwc */
};

typedef struct __stream_link {
	struct __stream_link *  next;
	struct __iobuf *        stream;
	unsigned char *         _base;          /* location of buffer */
	int                     _orientation;   /* wide/byte/not oriented */
	int                     _extflags;      /* extended flags */
	unsigned char           _tmpfchar;      /* tmpfile number */
	unsigned char           _filler[sizeof(int)-1];/* explicit padding */
	struct __pipe_info      pipeInfo;       /* pipe-related fields */
} __stream_link;

struct __pipe_info {
	int                 isPipe;     /* non-zero if it's a pipe */
	int                 pid;        /* PID of spawned process */
};