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#include <fcntl.h>
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#include "fd.h"
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int fd_copy(to,from)
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int to;
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int from;
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{
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if (to == from) return 0;
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if (fcntl(from,F_GETFL,0) == -1) return -1;
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close(to);
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if (fcntl(from,F_DUPFD,to) == -1) return -1;
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return 0;
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}