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Exercises for Advanced Programming in the UNIX Environment (3rd edition)
Line 23 in 2ecce52
Not sure whether it works on other systems, but...
I am using ubuntu 18.04. lseek(fd, offset, SEEK_HOLE/SEEK_DATA)
seems to change the file offset to the offset of the block that contains the hole or data.
For example, suppose I have a file containing "abc" followed by a hole with length 16*1024
bytes. If the file block size if 4096
, lseek(fd, 0, SEEK_HOLE)
would return 4096
instead of 3
.
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