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dup2

Syntax

 
#include <unistd.h>

int dup2(int existing_handle, int new_handle);

Description

This call causes new_handle to refer to the same file and file pointer as existing_handle. If new_handle is an open file, it is closed.

Return Value

The new handle, or -1 on error.

Portability

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

Example

 
/* copy new file to stdin stream */
close(0);
dup2(new_stdin, 0);
close(new_stdin);


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