HelenOS sources

lseek              60 uspace/lib/bithenge/src/failure.h #define lseek bithenge_failure_lseek
lseek             116 uspace/lib/posix/include/posix/unistd.h #define lseek lseek64
lseek             303 uspace/lib/posix/src/unistd.c off_t lseek(int fildes, off_t offset, int whence)