There is no reason not do do this, we already allow fork(2),
and I need vfork(2) for CHERI process colocation.
Reviewed by: brooks, emaste, oshogbo
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D39829
(cherry picked from commit 050555e129789fa2e20eba565f1320936b3d66e4)
getdirentires last argument "off_t *basep" is an optional output
argument. It returns the value only when the passed-in value(pointer)
is non-NULL.
This is a part of the research work at RCSLab, University of Waterloo.
Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41969
(cherry picked from commit 5e29272bf57e24a16f3a17f037f9a5e7cf25ed90)
Move the timerfd impelemntation from linux compat code to sys/kern. Use
it to implement the new system calls for timerfd. Add a hook to kern_tc
to allow timerfd to know when the system time has stepped. Add kqueue
support to timerfd. Adjust a few names to be less Linux centric.
RelNotes: YES
Reviewed by: markj (on irc), imp, kib (with reservations), jhb (slack)
Differential Revision: https://reviews.freebsd.org/D38459
This is an attempt at clean-room implementation of the Linux'
membarrier(2) syscall. For documentation, you would need to read
both membarrier(2) Linux man page, the comments in Linux
kernel/sched/membarrier.c implementation and possibly look at
actual uses.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32360
Back in 4.3BSD, the system call table wasn't generated, and there was an
entry:
"4.2 sigreturn", /* 139 = old 4.2 sigreturn */
This got converted to
139 OBSOL 0 4.2 sigreturn
in 4.3 RENO. Since it was obsolete, nothing bad happened. In fact,
there was code in makeyscalls.sh to cope:
{ comment = $4
for (i = 5; i <= NF; i++)
comment = comment " " $i
if (NF < 5)
$5 = $4
}
so the generated comment in syscalls.c was almost correct:
"obs_4.2", /* 139 = obsolete 4.2 sigreturn */
a bug that we have to this very day, despite makesyscalls.sh being
rewritten in lua.
However, this historical wart is the only place in our current
syscalls.master file where we have an extra field for the 'not
generated' class of system calls. Remove the historical wart so that the
re-write of makesyscalls.lua can be simpler (so, I hope, qemu's bsd-user
can large swathes of code automatically generated too). This should help
make things more understandable (changes to simplify makesyscalls.lue
aren't quite debugged, so have to wait for another day).
There's 3 different obsolete sigreturns (but only 1 that was ever in
FreeBSD 2.x and newer).
Sponsored by: Netflix
Have more accruate comments. While #if, #else, etc are copied to the
header files, lines that don't start with # are not. And #include files
are only output to sysinc (which winds up at the front of init_sysent.c
which seems a bit odd). This is all radically undocumented, and likely
has drifted somewhat from 4.4BSD and what other systems do (they've
drifted too, fwiw).
Sponsored by: Netflix
It takes the flags argument. Immediate use is to provide the KQUEUE_CLOEXEC
flag for kqueue(2).
Reviewed by: emaste, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D39271
posix_fadvise operates only on a provided fd. Noted by
Mathieu <sigsys@gmail.com> in review D34761.
No new CAP_ rights are added for posix_fadvise(), as 'advice' in
general only influences when I/O happens; the fd must have existing
CAP_ rights for actual data access.
Reviewed by: markj
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34903
Rather than combining the declearation of nosys with the registration
of SYS_syscall, declare syscall(2) and __syscall(2) with the new
SYSMUX type in syscalls.master and declare nosys directly. This
eliminates the last use of syscall aliases in the tree.
Reviewed by: kib, imp
This type is for system call multiplexers (syscall(2), __syscall(2))
that don't have a normal handler and instead are handled in the
machine-dependent syscall code.
Reviewed by: kib, imp
Declare the exit system call normally. This results in the
implementation being named sys_exit rather than sys_sys_exit and
being decalred as returning an int. Infact it does not return
at all because exit1 does not, so add an __unreachable() to let the
compiler know that.
Reviewed by: kib, imp
Declare o<foo>_args rather than reusing the equivalent <foo>_args
structs. Avoiding the addition of a new type isn't worth the
gratutious differences.
Reviewed by: kib, imp
This avoids the need to keep a freebsd32-specific syscalls.master
in sync with the default ABI. As evidenced by the number of commits
required to sync the two, it is extremely easy for them to get out
of sync due to misunderstandings and user errors.
Reviewed by: kevans, kib
Add _Contains_ annotations indicating that the data pointed to by a
pointer argument contains types that vary between FreeBSD ABIs. The
supported set is long (including size_t), pointer (including
intptr_t), and time_t. The first two vary between 32- and 64-bit
ABIs. The laste betwen i386 and everything else.
These will be used to detect which syscalls require handling on
particular ABIs.
Reviewed by: kevans, kib
Match the function decleration which takes an int not a signed int.
No functional change as the range of valid values is 0-2.
Obtained from: CheriBSD
Reviewed by: kevans
Rename to match the naming of syscalls and allow 32 to be appended
without making an ugly name like kevent_freebsd1132.
While here, make the kevent changelist argument const.
Reviewed by: kib
for compatibility with Linux.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32901
Switch the main syscall table to use CAPENABLED flags rather than
capabilities.conf. This avoid synchronization issues between
syscalls.master and capabilities.conf (e.g. when renaming a syscall
during development).
For now, move capabilities.conf to sys/compat/freebsd32 and use it
there. Use of sys/compat/freebsd32/syscalls.master should be replaced
by makesyscalls.lua enhancements to allow the main one to be used.
This change results in no changes to generated files after running
`make sysent`.
Reviewed by: kevans, emaste
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D31350
The CAPENABLED flag indicates that the syscall can be used in capsicum
capability mode. It is intended to replace capabilities.conf.
Reviewed by: kevans, emaste
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D31349
fspacectl(2) is a system call to provide space management support to
userspace applications. VOP_DEALLOCATE(9) is a VOP call to perform the
deallocation. vn_deallocate(9) is a public KPI for kmods' use.
The purpose of proposing a new system call, a KPI and a VOP call is to
allow bhyve or other hypervisor monitors to emulate the behavior of SCSI
UNMAP/NVMe DEALLOCATE on a plain file.
fspacectl(2) comprises of cmd and flags parameters to specify the
space management operation to be performed. Currently cmd has to be
SPACECTL_DEALLOC, and flags has to be 0.
fo_fspacectl is added to fileops.
VOP_DEALLOCATE(9) is added as a new VOP call. A trivial implementation
of VOP_DEALLOCATE(9) is provided.
Sponsored by: The FreeBSD Foundation
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D28347
to restore ABI compatibility for pre-10.x binaries.
It restores _umtx_lock() and _umtx_unlock() syscalls, and UMTX_OP_LOCK/
UMTX_OP_UNLOCK umtx_op(2) operations. UMUTEX_ERROR_CHECK flag is left
out for now, I do not think it makes a difference.
PR: 218571
Reviewed by: brooks (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D31220
It is best for auditing of syscalls.master if we only append to the
file. Reserving unimplemented system call numbers for local use makes
this policy and provides a large set of syscall numbers FreeBSD
derivatives can use without risk of conflict.
Reviewed by: jhb, kevans, kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D27988
RESERVED syscall number are reserved for local/vendor use. RESERVED is
identical to UNIMPL except that comments are ignored.
Reviewed by: kevans
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D27988
We have not been able to run binaries from other BSDs well over a
decade. There is no need to document their allocation decisions here.
We also don't need to reserve syscall numbers of never-implemented
syscalls.
Reviewed by: jhb, kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D27988
The originally chosen numbers interfere with downstream projects'
syscalls. Move them to the end of the syscall table instead.
Reported by: jrtc27
Reviewed by: brooks
MFC-With: 022ca2fc7f
Differential Revision: 022ca2fc7f
