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The signature of sendfile() on FreeBSD is different from the one
used on Linux.
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syz-extract was removing certain prefixes from syscall names, but this
caused some problems:
- freebsd* prefixes are for compatibility syscalls when the syscall ABI
has changed. For instance, we have both fstat() and
freebsd11_fstat(), and it is desirable to fuzz them both.
- Stripping prefixes may leave us with undefined SYS_ constants. This
resulted in some test failures in pkg/csource, which emitted code
referencing SYS_semctl when it should have been SYS___semctl.
Fix the problem by updating syscall descriptions to match the names
given by the FreeBSD kernel. Add some new descriptions for
compatibility syscalls, fix the mknodat() description (dev_t is now 64
bits wide on FreeBSD), and remove mknod$loop, which appears to be
Linux-specific.
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Currently when we get target consts with target.ConstMap["name"]
during target initialization, we just get 0 for missing consts.
This is error-prone as we can mis-type a const, or a const may
be undefined only on some archs (as we have common unix code
shared between several OSes).
Check that all the consts are actually defined.
The check detects several violations, to fix them:
1. move mremap to linux as it's only defined on linux
2. move S_IFMT to openbsd, as it's only defined and used on openbsd
3. define missing MAP_ANONYMOUS for freebsd and netbsd
4. fix extract for netbsd
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This is mostly copied form linux.
We probably need better support for sharing descriptions
between multiple OSes. But there are lots of differences,
so this is not trivial.
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For now we just make Go part build for freebsd.
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