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CodeBlocksPortable/WATCOM/samples/clibexam/dup.c

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#include <fcntl.h>
#include <io.h>
void main()
{
int handle, dup_handle;
handle = open( "file",
O_WRONLY | O_CREAT | O_TRUNC | O_TEXT,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP );
if( handle != -1 ) {
dup_handle = dup( handle );
if( dup_handle != -1 ) {
/* process file */
close( dup_handle );
}
close( handle );
}
}