File: fd_copy.c

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#include <fcntl.h>
#include "fd.h"

int fd_copy(int to,int from)
{
  if (to == from) return 0;
  if (fcntl(from,F_GETFL,0) == -1) return -1;
  close(to);
  if (fcntl(from,F_DUPFD,to) == -1) return -1;
  return 0;
}