Messages in this thread | | | From | Keith Owens <> | Subject | 2.4.18 no timestamp update on modified mmapped files | Date | Tue, 11 Jun 2002 15:33:48 +1000 |
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fd = open("foo", O_RDWR); map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); ... modify the mapped pages ... munmap(map, size); close(fd);
The timestamp on foo is not updated, even though the contents have changed. Adding msync(map, size, MS_[A]SYNC) before munmap makes no difference. 2.4.19-pre10 has no obvious fixes for this problem.
I was tearing my hair out wondering why some files were not being rsynced. No change on size or timestamp tells rsync that the file is "unchanged". I had to add a dummy write(map, fd, 1) to force a timestamp update.
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