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0.5.0 - initial release

0.5.9 - signal ABI bugfix, various cleanup and fixes:

sigset_t was wrongly defined as 1024 bytes instead of 1024 bits,
breaking the intended ABI compatibility with the LSB/glibc sigaction
structure. users should upgrade immediately and rebuild any libraries
or object files that might be using the incorrect definitions.

improved security against DoS with tcb shadow passwords by checking
that the file opened was really an ordinary file.

fixed a bug in the implementation of atomic ops that could have
allowed the compiler to incorrectly reorder them (in practice, gcc
with the default settings on i386 was not reordering them).

greatly improved conformance to the C and POSIX standards regarding
what the standard header files make visible. _POSIX_C_SOURCE is now
needed to get POSIX functions in standard C headers, and _XOPEN_SOURCE
or _GNU_SOURCE are required to get XSI interfaces or GNU extensions,

many internal improvements have been made to the syscall-related code
in preparation for porting to x86_64 and other archs.