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The following sequence of code has been observed in various programs: dup2(fd, 0); dup2(fd, 1); dup2(fd, 2); if(fd >; 2) close(fd); To see why the if test is needed, assume fd is 1 and draw a picture of what happens to the three descriptor entries and the corresponding file table entry with each call to dup2();To assume fd is 3 and draw the same picture! ÕâµÀÌâÄ¿Ôõ...
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