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* src/split.c (input_file_size): Do not bother with lseek if the initial read probe reaches EOF, since the file size is known then. This works better on macOS, which doesn’t allow lseek on /dev/null. Do not special-case size-zero files, as the issue can occur with any size file (though /proc files are the most common). If the current position is past end of file, treat this as size zero regardless of whether the file has a usable st_size. Pass through lseek -1 return values rather than using ‘return -1’; this makes the code a bit easier to analyze (and a bit faster). Avoid undefined behavior if the size calculation overflows. (lines_chunk_split): Do not bother with lseek if it would have no effect if successful. This works better on macOS, which doesn’t allow lseek on /dev/null. * tests/split/l-chunk.sh: Adjust to match fixed behavior.