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
Long ago (e129c18a83) __sys_sigwait was wrapped to prevent sigwait()
from returning with EINTR. Through a series of changes this wrapper
become __libc_sigwait which was internal to libc and used solely in the
interposing table. To support a move of sigwait back to libc, move this
wrapper into libsys and rename it with an __libsys_ prefix.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44238
Rather than having PSEUDO be a list of object files when all consumers
want syscall names or source files, make it a list of bare syscall
names like INTERPOSED (which is built on PSEUDO).
Improve document of variables developers can set.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44108
Consolidate in preparation for further cleanup.
Also relocate the sole NOASM entry.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44107
Every PSEUDO entry (_foo.o) has a corresponding NOASM entry (foo.o) to
suppress its addition to ASM. Check PSEUDO instead when adding entries
to ASM. No functional change.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44106
Move functions back to libc/gen sources; they are only versioned from
libc and not libsys.
Access libsys interposing slots using __libsys_interposing_slot()
instead of direct __libsys_interposing array dereference, which cannot
work from libc.
Reported by: glebius
Reviewed by: brooks
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D44042
that existed in auxv.c, use simple bool gate instead. This leaves a
small window if two threads try to call _elf_aux_info(3) simultaneously.
The situation is safe because auxv parsing is really idempotent. The
parsed data is the same, and we store atomic types (int/long/ptr) so
double-init does not matter.
Reviewed by: brooks, imp
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D43985
Continue to filter the public interface (elf_aux_info()), but entierly
relocate the private interfaces (_elf_aux_info(),
__init_elf_aux_vector(), and __elf_aux_vector) to libsys.
This ensures that rtld updates the correct (only) copy of
__elf_aux_vector. After 968a18975a
updates were confused and __getosreldate was failing, causing
the system to fall back to compat compat12 syscalls in some cases.
Return to explicitly linking libc to libsys and link libthr with libc
and libsys (in that order).
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D43910
libsys provides the FreeBSD kernel interface (auxargs, system calls,
vdso). It can be linked directly for programs using a non-standard
libc and will later be linked as a filter library to libc providing
the actual system call implementation.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
We now export all _ and __sys_ prefixed syscalls stubs from libc and
libsys so that libsys can replace them.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
This is part of the interface to the kernel and some syscall wrappers
depend on it so move it there.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
auxv support requires _once(), but we don't want the libsys version
stomping on the libc version should they diverge in the future. We
could rename it entierly, but for now just hook it in via Makefile.sys.
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
These system call wrappers call interposed system calls in fairly
trivial ways. Move them over to libsys so all __libsys_interposer
consumers end up in libsys.
Also move recvmmsg and sendmmsg as they are documented with recv and
send.
Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908
