These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threading library to support cancelation.
After discussion with kib (see D44111), I've concluded that it is
better to keep most public interfaces in libc with as little
as possible in libsys.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44241
Unlike other architectures, i386 only defined syscall() and not
_syscall() or __sys_syscall(). The syscall() function then invoked the
desired system call directly rather than invoking syscall(2). Keep the
latter as it's marginally more efficent, but also create the
conventional _syscall() and __sys_syscall() stubs.
This avoids the need to special case syscall(2) in the symbol list
generation in libsys.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44235
Historically we exposed _getlogin as a private symbol on a per-arch basis
(except on aarch64 and riscv) for no obvious reason. We now need to
expose it for libc's use so remove the special case from
makesyscalls.lua and expose it in the generated syscalls.map.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44116
Declare in sys/umtx.h and implement in libsys. Explicitly link libthr
with libsys.
When building libthr static include _umtx_op_err so we don't break static
linkage with -lpthread.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
rfork_thread(3) is assembly that makes syscalls directly and uses
cerror so it belongs in libsys.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
libc/<arch>/sys/Makefile.inc -> libsys/<arch>/Makefile.sys.
Require that libsys/<arch>/Makefile.sys exist. At least for current
archtiectures, it's not possible for an architecture to not have and MD
syscall bits.
powerpcspe/Makefile.sys's structure means it had to be modified when moved
so rename detection won't work, but it has trivial contents so the
history is unimportant.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
