NAME¶

fdup() - returns new file identical to the given file

SYNOPSIS¶

FILE fdup(f)
FILE *f;

DESCRIPTION¶

fdup() creates a new file stream which accesses the same file as f. The new file will have the same read/write/buffered attributes as the old file. fdup() can be used to simultaneously read from two different positions in a file.

RETURNS¶

Returns the duplicate file, if successful. Returns NULL, if it could not create the new stream.

NOTES¶

This call should be used carefully on buffered files open for writing. Changes made on one stream might be superseded by changes made on the other.