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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <fcntl.h>, <io.h>, <sys\types.h>, <sys\stat.h>
 
  Syntax:    int _open( char *filename, int oflag[, int pmode ] );
             oflag: _O_APPEND, _O_BINARY, _O_CREAT, _O_EXCL, _O_RDONLY,
                    _O_RDWR, _O_TEXT, _O_TRUNC, _O_WRONLY
                    (may be joined by |)
             pmode: _S_IWRITE, _S_IREAD, _S_IREAD | _S_IWRITE
 
  Returns:   a handle if successful, or -1 if not.
             errno:  EACCES, EEXIST, EINVAL, EMFILE, ENOENT
 
  See also:  _close, _sopen, _creat, _dup, fopen
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