The issue appears to be caused by mmap no longer supporting 0-length file mapping in linux kernel 2.6.12. See this webpage: http://www.linuxhq.com/kernel/v2.6/12-rc1-bk6/mm/mmap.c diff -Nru a/mm/mmap.c b/mm/mmap.c --- a/mm/mmap.c 2005-03-10 00:38:22 -08:00 +++ b/mm/mmap.c 2005-03-28 14:21:37 -08:00 @@ -896,16 +896,16 @@ prot |= PROT_EXEC; if (!len) - return addr; + return -EINVAL; In other words in kernel 2.6.12 mmap returns EINVAL when the length to be mapped is 0. One workaround for this would be to create all new files with 1 byte (contents: \0), before mmapping them.
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