io.h

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access Checks whether a file exists and whether the specified access is available.
chmod Sets file access permissions.
chsize Changes the size of an open file.
close Closes the specified file.
creat Creates a new file or opens and truncates an existing file.
dup Duplicates a file handle.
dup2 Duplicates a file handle, specifying the value of the new handle.
eof Determines if the end of a seekable file has been reached.
filelength Determines the size of a file.
isatty Determines if the specified file handle is that of a character device.
lseek Moves the file pointer to the specified location.
open Opens a file.
read Reads from a file.
setmode Sets the mode of an open file.
sopen Opens a file for shared reading or writing.
tell Queries the current position of a file's pointer.
umask Sets the file permission mask of the executing process.
unlink Deletes a file.
write Writes to a file.


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