The <io.h> include file defines the following file handle and low-level input and output functions:
| access | dup | isatty | remove | _tell |
| chmod | dup2 | lseek | rename | umask |
| _chsize | __eof | open | _setmode | unlink |
| close | _filelength | read | _sopen | write |
| creat |
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<sys\stat.h>
<fcntl.h>
<share.h>
<stdio.h>