lib{c,sys}: normalize export of openat, setcontext, and swapcontext

List them in the symbol map rather than using the __sym_default to
expose them. This will allow later improvements in the stub
im

lib{c,sys}: normalize export of openat, setcontext, and swapcontext

List them in the symbol map rather than using the __sym_default to
expose them. This will allow later improvements in the stub
implementations in libc.so.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44113

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libsys: expose a few more symbols for libc's use

These private symbols are used by libc so expose as we do with
auxargs bits rather then relying on duplicate implementations in libc.

Reviewed by: k

libsys: expose a few more symbols for libc's use

These private symbols are used by libc so expose as we do with
auxargs bits rather then relying on duplicate implementations in libc.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44114

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libsys: add a libsys.h

This declares an API for libsys which currently consists of
__sys_<foo>() declarations for system call stubs and function pointer
typedefs of the form __sys_<foo>_t. The vast

libsys: add a libsys.h

This declares an API for libsys which currently consists of
__sys_<foo>() declarations for system call stubs and function pointer
typedefs of the form __sys_<foo>_t. The vast majority of the
implementation resides in a generated _libsys.h which ensures that all
system call stub declarations match syscalls.master.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44387

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