Lseek,Read system calls

[manasa_1]

Hello Everyone,

i am new to the HP-UX.
Could you please explain how a lseek and a read system calls will work.

my Job is to do the following:

7. Open existing file via open() with the O_RDONLY flag.
8. Call lseek() with SEEK_CUR flag, offset 0.
9. Call lseek() with SEEK_CUR flag, offset 60.
10. Call lseek() with SEEK_CUR flag, offset 0.
11. Call lseek() with SEEK_CUR flag, offset -40.
12. Read 40 bytes from file.
13. Call lseek() with SEEK_CUR flag, offset 0.
14. Close file.

[Dennis Handly]

>i am new to the HP-UX.

This is nothing unique to HP-UX. These are standard calls you can make from C.
See open(2), lseek(2), read(2) and close(2).