dup

Syntax

#include <unistd.h> int dup(int old_handle);

Description

This function duplicates the given file handle. Both handles refer to the same file and file pointer.

Return Value

The new file handle, or -1 if error.

Portability

ANSI/ISO C	No
POSIX	1003.2-1992; 1003.1-2001

Example

do_file(dup(fileno(stdin)));