20 <<freopen64>>---open a large file using an existing file descriptor
29 	FILE *freopen64(const char *<[file]>, const char *<[mode]>,
30 		        FILE *<[fp]>);
31 	FILE *_freopen64_r(struct _reent *<[ptr]>, const char *<[file]>,
32 		        const char *<[mode]>, FILE *<[fp]>);
35 Use this variant of <<fopen64>> if you wish to specify a particular file
37 the file.
39 If <[fp]> was associated with another file or stream, <<freopen64>>
40 closes that other file or stream (but ignores any errors while closing
43 <[file]> and <[mode]> are used just as in <<fopen>>.
45 If <[file]> is <<NULL>>, the underlying stream is modified rather than
46 closed.  The file cannot be given a more permissive access mode (for
47 example, a <[mode]> of "w" will fail on a read-only file descriptor),
53 file cannot be opened as specified, the result is <<NULL>>.
73  * Re-direct an existing, open (probably) file to some other file.
78 FILE *
80 	const char *file,  in freopen64()  argument
82 	register FILE *fp)  in freopen64()
114    * which file descriptor (if any) was associated with it.  in freopen64()
117    * This is unnecessary if it was not a Unix file.  in freopen64()
128        * If file is NULL, the file should not be closed.  in freopen64()
130       if (fp->_close != NULL && file != NULL)  in freopen64()
135    * Now get a new descriptor to refer to the new file, or reuse the  in freopen64()
136    * existing file descriptor if file is NULL.  in freopen64()
139   if (file != NULL)  in freopen64()
141       f = open64 ((char *) file, oflags, 0666);  in freopen64()
149        * Reuse the file descriptor, but only if the new access mode is  in freopen64()