Assuming that the disk file foobar.txt consists of the six ASCII characters foobar, what is the output of the following program?

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1 #include "csapp.h" 2 3 4 5 6 7 8 9 10 11 12 13 14 15 int main() { } int fd1, fd2; char c; fd1 = Open ("foobar.txt", fd2 = Open ("foobar.txt", Read (fd2, &c, 1); Dup2 (fd2, fd1); Read (fd1, &c, 1); printf ("c %c\n", c); exit(0); = O_RDONLY, 0); O_RDONLY, 0);