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#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
const size_t BUF_SIZE = 1024;
int main(int argc, char *argv[]) {
if (argc < 3) return 1;
int fd_from = open(argv[1], O_RDONLY);
if (fd_from < 0) return 2;
int fd_to = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0744);
if (fd_to < 0) return 3;
char buf[BUF_SIZE];
size_t actual = read(fd_from, buf, BUF_SIZE);
while (actual > 0) {
write(fd_to, buf, actual);
actual = read(fd_from, buf, BUF_SIZE);
}
return 0;
}
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