Week 06 (54)

off_t lseek(int FileDesc, off_t Offset, int Whence)

set the "current position" of the FileDesc
Offset is in units of bytes, and can be negative
Whence can be one of ...
- SEEK_SET ... set file position to Offset from start of file
- SEEK_CUR ... set file position to Offset from current position
- SEEK_END ... set file position to Offset from end of file
seeking beyond end of file leaves a gap which reads as 0's
seeking back beyond start of file sets position to start of file

Example: lseek(fd, 0, SEEK_END); (move to end of file)