the following sequence of code has been observed in various

Project Description:

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 that 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. then assume that fd is 3 and draw the same picture.
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