1 /* The opaque type of streams.  This is the definition used elsewhere.  */ 2  46 typedef struct _IO_FILE FILE; 3 ... 4 #include <libio.h> 5 ... 6 /* Standard streams.  */ 7 142 extern struct _IO_FILE *stdin;          /* Standard input stream.  */ 8 143 extern struct _IO_FILE *stdout;         /* Standard output stream.  */ 9 144 extern struct _IO_FILE *stderr;         /* Standard error output stream.  */145 #ifdef __STDC__10 146 /* C89/C99 say they‘re macros.  Make them happy.  */11 147 #define stdin stdin12 148 #define stdout stdout13 149 #define stderr stderr14 150 #endif

 1 struct _IO_FILE { 2 269   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */ 3 270 #define _IO_file_flags _flags 4 271 5 272   /* The following pointers correspond to the C++ streambuf protocol. */ 6 273   /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */ 7 274   char* _IO_read_ptr;   /* Current read pointer */ 8 275   char* _IO_read_end;   /* End of get area. */ 9 276   char* _IO_read_base;  /* Start of putback+get area. */10 277   char* _IO_write_base; /* Start of put area. */11 278   char* _IO_write_ptr;  /* Current put pointer. */12 279   char* _IO_write_end;  /* End of put area. */13 280   char* _IO_buf_base;   /* Start of reserve area. */14 281   char* _IO_buf_end;    /* End of reserve area. */15 282   /* The following fields are used to support backing up and undo. */16 283   char *_IO_save_base; /* Pointer to start of non-current get area. */17 284   char *_IO_backup_base;  /* Pointer to first valid character of backup area     */18 285   char *_IO_save_end; /* Pointer to end of non-current get area. */19 28620 287   struct _IO_marker *_markers;21 28822 289   struct _IO_FILE *_chain;23 24 291   int _fileno;25 292 #if 026 293   int _blksize;27 294 #else28 295   int _flags2;29 296 #endif30 297   _IO_off_t _old_offset; /* This used to be _offset but it‘s too small.  */31 29832 299 #define __HAVE_COLUMN /* temporary */33 300   /* 1+column number of pbase(); 0 is unknown. */34 301   unsigned short _cur_column;35 302   signed char _vtable_offset;36 303   char _shortbuf[1];37 30438 305   /*  char* _save_gptr;  char* _save_egptr; */39 30640 307   _IO_lock_t *_lock;41 308 #ifdef _IO_USE_OLD_IO_FILE42 309 };