File generated:
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
******************
Read twice from a regular file
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
---
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
---
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
******************
Read twice from file descriptor that corresponds to a regular file
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
---
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
---
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA
0	BBB
1	BBB
2	BBB
3	BBB
4	AAA
5	BBB
6	AAA