Before this change, swapon(8) implied that -F works as a standalone option,
which is not the case and would produce a usage message. This change extends
the description of the -F option to mention that -a is required with it.
PR: 238551
Submitted by: Christian Baltini
MFC after: 5 days
Update SYNOPSIS section to be consistent regarding -u, -i, and -I.
Apparently, when the -u, -i and -I options where added to sed(1), it was
forgotten to add them to both lines in the SYNOPSIS section. They were only
added to the second line, although they apply to both.
With the updated SYNOPSIS, it is now allowed (and consistent) to run:
sed -i BAK s/foo/bar/g some_file
PR: 240556
Submitted by: Oliver Fromme
MFC after: 5 days
Emmanuel Vadot [Tue, 19 May 2020 09:04:35 +0000 (09:04 +0000)]
linuxkpi: Add irq_work.h
Since handlers are call in a thread context we can simply use a workqueue
to emulate those functions.
The DRM code was patched to do that already, having it in linuxkpi allows us
to not patch the upstream code.
Sponsored-by: The FreeBSD Foundation
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D24859
Emmanuel Vadot [Tue, 19 May 2020 08:43:17 +0000 (08:43 +0000)]
linuxkpi: Add __init_waitqueue_head
The only difference with init_waitqueue_head is that the name and the
lock class key are provided but we don't use those so use init_waitqueue_head
directly.
Sponsored-by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24861
Michael Tuexen [Tue, 19 May 2020 07:23:35 +0000 (07:23 +0000)]
Replace snprintf() by SCTP_SNPRINTF() and let SCTP_SNPRINTF() map
to snprintf() on FreeBSD. This allows to check for failures of snprintf()
on platforms other than FreeBSD kernel.
Michael Tuexen [Tue, 19 May 2020 07:21:11 +0000 (07:21 +0000)]
Revert r361209:
cem noted that on FreeBSD snprintf() can not fail and code should not
check for that.
A followup commit will replace the usage of snprintf() in the SCTP
sources with a variadic macro SCTP_SNPRINTF, which will simply map to
snprintf() on FreeBSD and do a checking similar to r361209 on
other platforms.
Kyle Evans [Tue, 19 May 2020 02:41:05 +0000 (02:41 +0000)]
zfs: reject read(2) of a dirfd with EISDIR
This is independent of the recently-discussed global change, which is still
in review/discussion stage.
This is effectively a measure for consistency in the ZFS world, where
FreeBSD was the only platform (as far as I could find) that allowed this.
What ZFS exposes is decidedly not useful for any real purposes, to
paraphrase (hopefully faithfully) jhb's findings when exploring this:
The size of a directory in ZFS is the number of directory entries within.
When reading a directory, you would instead get the leading part of its raw
contents; the amount you get being dictated by the "size," i.e. number of
directory entries. There's decidedly (luckily) no stack disclosure happening
here, though the behavior is bizarre and almost certainly a historical
accident.
This change has already been upstreamed to OpenZFS.
Justin Hibbits [Tue, 19 May 2020 01:06:31 +0000 (01:06 +0000)]
powerpc/mmu: Don't use the cache instructions to zero pages
A page (even physmem) can be marked as cache-inhibited. Attempting to use
'dcbz' to zero a page mapped cache-inhibited triggers an alignment
exception, which is fatal in kernel. This was seen when testing hardware
acceleration with X on POWER9.
At some point in the future, this should be changed to a more straight
forward zero loop instead of bzero(), and a similar change be made to the
other pmaps.
Mike Karels [Mon, 18 May 2020 22:53:12 +0000 (22:53 +0000)]
Allow TCP to reuse local port with different destinations
Previously, tcp_connect() would bind a local port before connecting,
forcing the local port to be unique across all outgoing TCP connections
for the address family. Instead, choose a local port after selecting
the destination and the local address, requiring only that the tuple
is unique and does not match a wildcard binding.
Alan Somers [Mon, 18 May 2020 18:36:32 +0000 (18:36 +0000)]
fusefs: fix intermittency in some ENOENT tests
When a FUSE operation other than LOOKUP returns ENOENT, the kernel will
reclaim that vnode, resuling in a FUSE_FORGET being sent a short while
later. Many of the ENOENT tests weren't expecting those FUSE_FORGET
operations. They usually passed by luck since FUSE_FORGET is often delayed.
This commit adds appropriate expectations.
Colin Percival [Mon, 18 May 2020 02:14:25 +0000 (02:14 +0000)]
Add ebsnvme-id to EC2 AMIs and enable /dev/aws/disk
The ebsnvme-id utility exposes information about EC2 disks -- for
Elastic Block Store volumes, their volume IDs and "linux device
names", and for Instance Store (aka "Ephemeral") disks, their
serial numbers.
The dev_aws_disk rc.d script and associated devd.conf rule maintains
a tree under /dev/aws/disk:
/dev/aws/disk/ebs/<volume ID>
/dev/aws/disk/linuxname/<linux device name>
/dev/aws/disk/ephemeral/<serial number>
which are symlinks to the corresponding nda or nvd devices.
Kyle Evans [Mon, 18 May 2020 01:48:55 +0000 (01:48 +0000)]
Revert r360833, r360882: certctl rehash in installworld
This was solving the correct-ish problem in the wrong place. Noted by
brooks; while he didn't request a prompt revert, doing so now will
facilitate proper testing for the revised version of this.
Kyle Evans [Mon, 18 May 2020 01:35:44 +0000 (01:35 +0000)]
certctl: don't fall over flat with relative DESTDIR
Up until now, all of our DESTDIR use has been with absolute paths. It turned
out that the cd in/out dance we do here breaks us down later on, as the
relative path no longer resolves.
Convert EXTENSIONS to an ERE that we'll use to grep ls -1 of the dir we're
inspecting, rather than cd'ing into it and globbing it up.
Rick Macklem [Mon, 18 May 2020 00:07:45 +0000 (00:07 +0000)]
Add a function nfsm_set() to initialize "struct nfsrv_descript" for building
mbuf lists.
This function is currently trivial, but will that will change when
support for building NFS messages in ext_pgs mbufs is added.
Adding support for ext_pgs mbufs is needed for KERN_TLS, which will
be used to implement nfs-over-tls.
Colin Percival [Sun, 17 May 2020 21:54:59 +0000 (21:54 +0000)]
Add /etc/autofs/special_efs to EC2 AMIs
Since Amazon Elastic File System is only available within AWS, it seems
more appropriate to have this added only in EC2 AMIs rather than
"polluting" non-EC2 images with it.
Reviewed by: gjb
MFC after: 7 days
Relnotes: Amazon EFS filesystems can be automounted by enabling autofs
and placing "/efs -efs" into /etc/auto_master.
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D24791
Emmanuel Vadot [Sun, 17 May 2020 20:09:11 +0000 (20:09 +0000)]
linuxkpi: Add atomic_dec_and_mutex_lock
This function decrement the counter and if the result is 0 it acquires
the mutex and returns 1, if not it simply returns 0.
Needed by DRM from Linux v5.3
Sponsored-by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24847
Remove redundant checks for nhop validity.
Currently NH_IS_VALID() simly aliases to RT_LINK_IS_UP(), so we're
checking the same thing twice.
In the near future the implementation of this check will be simpler,
as there are plans to introduce control-plane interface status monitoring
similar to ipfw interface tracker.
Fedor Uporov [Sun, 17 May 2020 14:00:54 +0000 (14:00 +0000)]
Add inode bitmap tail initialization.
Make ext2fs compatible with changes introduced in e2fsprogs v1.45.2.
Now the tail of inode bitmap is filled with 0xff pattern explicitly during
bitmap initialization phase to avoid e2fsck error like:
"Padding at end of inode bitmap is not set."
Adrian Chadd [Sat, 16 May 2020 21:59:41 +0000 (21:59 +0000)]
[ath_rate_sample] Fix correct status when completing frames with short failures.
My preivous logic was a bit wrong. This caused transmissions that failed due
to a mix of short and long retries to count intermediate rates as OK if the
LONG retry count indicated some retries had made it to this intermediate rate,
but the SHORT retry count was the one that caused the whole transmit to fail.
Now status is passed in again - and this is the status for the whole transmission -
and then update_stats() does some quick math to see if the current transmission
series hit its long retry count or not before updating things as a success
or failure.
Colin Percival [Sat, 16 May 2020 18:37:48 +0000 (18:37 +0000)]
Move the devmatch rc.d script before netif in the boot process.
Prior to this change, using lagg to aggregate wired and wireless networks
was broken in the (relatively common) case where wifi drivers + firmware
are loaded by devmatch, since the interface didn't exist at the time when
the lagg interface was being created.
Pawel Biernacki [Sat, 16 May 2020 17:05:44 +0000 (17:05 +0000)]
sysctl: fix setting net.isr.dispatch during early boot
Fix another collateral damage of r357614: netisr is initialised way before
malloc() is available hence it can't use sysctl_handle_string() that
allocates temporary buffer. Handle that internally in
sysctl_netisr_dispatch_policy().
Jilles Tjoelker [Sat, 16 May 2020 16:29:23 +0000 (16:29 +0000)]
sh: Fix double INTON with vfork
The shell maintains a count of the number of times SIGINT processing has
been disabled via INTOFF, so SIGINT processing resumes when all disables
have enabled again (INTON).
If an error occurs in a vfork() child, the processing of the error enables
SIGINT processing again, and the INTON in vforkexecshell() causes the count
to become negative.
As a result, a later INTOFF may not actually disable SIGINT processing. This
might cause memory corruption if a SIGINT arrives at an inopportune time. As
of r360452, it causes the shell to abort when it would unsafely allocate or
free memory in certain ways.
Note that various places such as errors in non-special builtins
unconditionally reset the count to 0, so the problem might still not always
be visible.
Adrian Chadd [Sat, 16 May 2020 05:07:45 +0000 (05:07 +0000)]
[ath_rate_sample] Limit the tx schedules for A-MPDU ; don't take short retries
into account and remove the requirement that the MCS rate is "higher" if we're
considering a new rate.
Ok, another fun one.
* In order for reliable non-software retried higher MCS rates, the TX schedules
(inconsistently!) use hard-coded lower rates at the end of the schedule.
Now, hard-coded is a problem because (a) it means that aggregate formation
is limited by the SLOWEST rate, so I never formed large AMDU frames for
3 stream rates, and (b) if the AP disables lower rates as base rates, it
complains about "unknown rix" every frame you transmit at that rate.
So, for now just disable the third and fourth schedule entry for AMPDUs.
Now I'm forming 32k and 64k aggregates for the higher density MCS rates
much more reliably.
It would be much nicer if the rate schedule stuff wasn't fixed but instead
I'd just populate ath_rc_series[] when I fetch the rates. This is all a
holdover of ye olde pre-11n stuff and I really just need to nuke it.
But for now, ye hack.
* The check for "is this MCS rate better" based on MCS itself is just garbage.
It meant things like going MCS0->7 would be fine, and say 0->8->16 is fine,
(as they're equivalent encoding but 1,2,3 spatial streams), BUT it meant
going something like MCS7->11 would fail even though it's likely that
MCS11 would just be better, both for EWMA/BER and throughput.
So for now just use the average tx time. The "right" way for this comparison
would be to compare PHY bitrates rather than MCS / rate indexes, but I'm not
yet there. The bit rates ARE available in the PHY index, but honestly
I have a lot of other cleaning up to here before I think about that.
* Don't include the RTS/CTS retry count (and thus time) into the average tx time
caluation. It just makes temporarily failures make the rate look bad by
QUITE A LOT, as RTS/CTS exchanges are (a) long, and (b) mostly irrelevant
to the actual rate being tried. If we keep hitting RTS/CTS failures then
there's something ELSE wrong on the channel, not our selected rate.
Add BSM record conversion for a number of syscalls:
- thr_kill(2) and thr_exit(2) generally (no argument auditing here.
- A set of syscalls for the process descriptor family, specifically:
pdfork(2), pdgetpid(2) and pdkill(2)
For these syscalls, audit the file descriptor. In the case of pdfork(2)
a pointer to an integer (file descriptor) is passed in as an argument.
We audit the post initialized file descriptor (not the random garbage
that would have been passed in). We will also audit the child process
which was created from the fork operation (similar to what is done for
the fork(2) syscall).
pdkill(2) we audit the signal value and fd, and finally pdgetpid(2)
just the file descriptor:
- Following is a sample of the produced audit trails:
Justin Hibbits [Sat, 16 May 2020 03:33:28 +0000 (03:33 +0000)]
powerpc/qoriq: Add more devices to config for desktop usage
The most likely users of the QORIQ64 config nowadays are users of AmigaOne
X5000 systems, which are desktops. They need a framebuffer and
keyboard/mouse, so add these to the config so it works by default once
drm-current-kmod is installed.
Ed Maste [Sat, 16 May 2020 02:29:10 +0000 (02:29 +0000)]
libalias: retire cuseeme support
The CU-SeeMe videoconferencing client and associated protocol is at this
point a historical artifact; there is no need to retain support for this
protocol today.
Reviewed by: philip, markj, allanjude
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24790
Adrian Chadd [Sat, 16 May 2020 01:56:06 +0000 (01:56 +0000)]
[ath_rate_sample] Fix logic for determining whether to bump up an MCS rate.
* Fix formatting, cause reasons;
* Put back the "and the chosen rate is within 90% of the current rate" logic;
* Ensure the best rate and the current rate aren't the same; this ...
* ... fixes the packets_since_switch[] tracking to actually conut how many
frames since the rate switched, so now I know how stable stuff is; and
* Ensure that MCS can go up to a higher MCS at this or any other spatial stream.
My previous quick hack attempt was doing > rather than >= so you had to go
to both a higher root MCS rate (0..7) and spatial stream. Eg, you couldn't
go from MCS0 (1ss) to MCS8 (2ss) this way.
The best rate and switching rate logic still have a bunch more work to do
because they're still quite touchy when it comes to average tx time but at least
now it's choosing higher rates correctly when it wants to try a higher rate.
Colin Percival [Sat, 16 May 2020 01:50:28 +0000 (01:50 +0000)]
Send Lid status notification via devd from acpi_lid_status_update.
Some laptops don't send ACPI "lid status changed" notifications upon
opening the lid if the system was currently suspended. In r358219
this was partially fixed, updating the "lid_status" variable upon
resume even if there is no "status changed" notification from ACPI.
Unfortunately the fix in r358219 did not include notifying userland
via devd; this causes problems on systems using upowerd (e.g. KDE),
since upowerd remembers the most recent devd notification about the
lid status rather than querying the sysctl to get the current status.
This showed up as two symptoms when KDE's "When laptop lid closed: Sleep"
option is set:
1. 50% of the time, closing the lid would not trigger S3 sleep.
2. 50% of the time, plugging/unplugging AC power would trigger S3 sleep.
Mark Johnston [Sat, 16 May 2020 00:28:12 +0000 (00:28 +0000)]
pf: Add a new zone for per-table entry counters.
Right now we optionally allocate 8 counters per table entry, so in
addition to memory consumed by counters, we require 8 pointers worth of
space in each entry even when counters are not allocated (the default).
Instead, define a UMA zone that returns contiguous per-CPU counter
arrays for use in table entries. On amd64 this reduces sizeof(struct
pfr_kentry) from 216 to 160. The smaller size also results in better
slab efficiency, so memory usage for large tables is reduced by about
28%.
Adrian Chadd [Fri, 15 May 2020 18:51:20 +0000 (18:51 +0000)]
[ath] [ath_rate] Extend ath_rate_sample to better handle 11n rates and aggregates.
My initial rate control code was .. suboptimal. I wanted to at least get MCS
rates sent, but it didn't do anywhere near enough to handle low signal level links
or remotely keep accurate statistics.
So, 8 years later, here's what I should've done back then.
* Firstly, I wasn't at all tracking packet sizes other than the two buckets
(250 and 1600 bytes.) So, extend it to include 4096, 8192, 16384, 32768 and
65536. I may go add 2048 at some point if I find it's useful.
This is important for a few reasons. First, when forming A-MPDU or AMSDU
aggregates the frame sizes are larger, and thus the TX time calculation
is woefully, increasingly wrong. Secondly, the behaviour of 802.11 channels
isn't some fixed thing, both due to channel conditions and radios themselves.
Notably, there was some observations done a few years ago on 11n chipsets
which noticed longer aggregates showed an increase in failed A-MPDU sub-frame
reception as you got further along in the transmit time. It could be due to
a variety of things - transmitter linearity, channel conditions changing,
frequency/phase drift, etc - but the observation was to potentially form
shorter aggregates to improve BER.
* .. and then modify the ath TX path to report the length of the aggregate sent,
so as the statistics kept would line up with the correct bucket.
* Then on the rate control look-up side - i was also only using the first frame
length for an A-MPDU rate control lookup which isn't good enough here.
So, add a new method that walks the TID software queue for that node to
find out what the likely length of data available is. It isn't ALL of the
data in the queue because we'll only ever send enough data to fit inside the
block-ack window, so limit how many bytes we return to roughly what ath_tx_form_aggr()
would do.
* .. and cache that in the first ath_buf in the aggregate so it and the eventual
AMPDU length can be returned to the rate control code.
* THEN, modify the rate control code to look at them both when deciding which bucket
to attribute the sent frame on. I'm erring on the side of caution and using the
size bucket that the lookup is based on.
Ok, so now the rate lookups and statistics are "more correct". However, MCS rates
are not the same as 11abg rates in that they're not a monotonically incrementing
set of faster rates and you can't assume that just because a given MCS rate fails,
the next higher one wouldn't work better or be a lower average tx time.
So, I had to do a bunch of surgery to the best rate and sample rate math.
This is the bit that's a WIP.
* First, simplify the statistics updates (update_stats()) to do a single pass on
all rates.
* Next, make sure that each rate average tx time is updated based on /its/ failure/success.
Eg if you sent a frame with { MCS15, MCS12, MCS8 } and MCS8 succeeded, MCS15 and MCS
12 would have their average tx time updated for /their/ part of the transmission,
not the whole transmission.
* Next, EWMA wasn't being fully calculated based on the /failures/ in each of the
rate attempts. So, if MCS15, MCS12 failed above but MCS8 didn't, then ensure
that the statistics noted that /all/ subframes failed at those rates, rather than
the eventual set of transmitted/sent frames. This ensures the EWMA /and/ average
TX time are updated correctly.
* When picking a sample rate and initial rate, probe rates aroud the current MCS
but limit it to MCS0..7 /for all spatial streams/, rather than doing crazy things
like hitting MCS7 and then probing MCS8 - MCS8 is basically MCS0 but two spatial
streams. It's a /lot/ slower than MCS7. Also, the reverse is true - if we're at
MCS8 then don't probe MCS7 as part of it, it's not likely to succeed.
* Fix bugs in pick_best_rate() where I was /immediately/ choosing the highest MCS
rate if there weren't any frames yet transmitted. I was defaulting to 25% EWMA and
.. then each comparison would accept the higher rate. Just skip those; sampling
will fill in the details.
So, this seems to work a lot better. It's not perfect; I'm still seeing a lot of
instability around higher MCS rates because there are bursts of loss/retransmissions
that aren't /too/ bad. But i'll keep iterating over this and tidying up my hacks.
Ok, so why this still something I'm poking at? rather than porting minstrel_ht?
ath_rate_sample tries to minimise airtime, not maximise throughput. I have
extended it with an EWMA based on sub-frame success/failures - high MCS rates
that have partially successful receptions still show super short average frame
times, but a /lot/ of retransmits have to happen for that to work.
So for MCS rates I also track this EWMA and ensure that the rates I'm choosing
don't have super crappy packet failures. I don't mind not getting lower
peak throughput versus minstrel_ht; instead I want to see if I can make "minimise
airtime" work well.
Tested:
* AR9380, STA mode
* AR9344, STA mode
* AR9580, STA/AP mode
Introduce sysputpage() to display large page size with human readable format.
Using UI units allows to fit larger numbers in columns.
Stop calling v_page_size - this is a value that doesn't change at runtime.
Renamed WINDOW *wnd to *wd to avoid conflict with global *wnd variable.
Use bit-shift to convert page size to byte.
Conrad Meyer [Fri, 15 May 2020 15:54:22 +0000 (15:54 +0000)]
vmm(4), bhyve(8): Expose kernel-emulated special devices to userspace
Expose the special kernel LAPIC, IOAPIC, and HPET devices to userspace
for use in, e.g., fallback instruction emulation (when userspace has a
newer instruction decode/emulation layer than the kernel vmm(4)).
Plumb the ioctl through libvmmapi and register the memory ranges in
bhyve(8).
Randall Stewart [Fri, 15 May 2020 14:00:12 +0000 (14:00 +0000)]
This fixes several skyzaller issues found with the
help of Michael Tuexen. There was some accounting
errors with TCPFO for bbr and also for both rack
and bbr there was a FO case where we should be
jumping to the just_return_nolock label to
exit instead of returning 0. This of course
caused no timer to be running and thus the
stuck sessions.
Reported by: Michael Tuexen and Skyzaller
Sponsored by: Netflix Inc.
Differential Revision: https://reviews.freebsd.org/D24852
Assign process group of the TTY under the "proctree_lock".
This fixes a race where concurrent calls to doenterpgrp() and
leavepgrp() while TIOCSCTTY is executing may result in tp->t_pgrp
changing value so that tty_rel_pgrp() misses clearing it to NULL. For
more details refer to the use of pgdelete() in the kernel.
No functional change intended.
Panic backtrace:
__mtx_lock_sleep() # page fault due to using destroyed mutex
tty_signal_pgrp()
tty_ioctl()
ptsdev_ioctl()
kern_ioctl()
sys_ioctl()
amd64_syscall()
Fix SYNPOSIS section to point to the proper include directive.
netgraph(3) points to #include <netgraph/netgraph.h>, which is kernel only.
The man page refers to the user-space part of the netgraph module, which is
located in <netgraph.h>.
bhyve: Fix processing of netgraph backend options.
After r360820, additional parameters are passed through the argument 'opts', and the name of the backend through the argument 'devname'. So, there is no need to skip the backend name from the 'opts' argument.
Ryan Moeller [Thu, 14 May 2020 23:38:11 +0000 (23:38 +0000)]
jail: Add exec.prepare and exec.release command hooks
This change introduces new jail command hooks that run before and after any
other actions.
The exec.prepare hook can be used for example to invoke a script that checks
if the jail's root exists, creating it if it does not. Since arbitrary
variables in jail.conf can be passed to the command, it can be pretty useful
for templating jails.
An example use case for exec.release would be to remove the filesystem of an
ephemeral jail.
The names "prepare" and "release" are borrowed from the names of similar hooks
in libvirt.
Kyle Evans [Thu, 14 May 2020 23:20:58 +0000 (23:20 +0000)]
pf tests: fix up a couple WARNS= 6 nits
common_init_tbl is only used within this single CU, so it should be marked
static.
WARNS=6 also complained about the var defined by
`ATF_TC_WITH_CLEANUP(getastats);` being unused, which turns out to be
because it's not been hooked up in ATF_TP_ADD_TCS. kp@ did not immediately
recall any reason for this, and the case passes on my local system, so hook
it up.
Note that I've not yet set WARNS= 6 here. Investigation is underway to see
if we can feasibly default WARNS to 6 for src builds to catch directories
too deep to inherit a WARNS from the top-level subdirectories' Makefile.inc.
Those particular WARNS settings will be subsequently removed as they become
redundant with a more-global default.
Peter Grehan [Thu, 14 May 2020 22:18:12 +0000 (22:18 +0000)]
Hide host CPUID 0x15 TSC/Crystal ratio/freq info from guest
In recent Linux (5.3+) and OpenBSD (6.6+) kernels, and with hosts that
support CPUID 0x15, the local APIC frequency is determined directly
from the reported crystal clock to avoid calibration against the 8254
timer.
However, the local APIC frequency implemented by bhyve is 128MHz, where
most h/w systems report frequencies around 25MHz. This shows up on
OpenBSD guests as repeated keystrokes on the emulated PS2 keyboard
when using VNC, since the kernel's timers are now much shorter.
Fix by reporting all-zeroes for CPUID 0x15. This allows guests to fall
back to using the 8254 to calibrate the local APIC frequency.
Future work could be to compute values returned for 0x15 that would
match the host TSC and bhyve local APIC frequency, though all dependencies
on this would need to be examined (for example, Linux will start using
0x16 for some hosts).
Fix spurious ENOTCONN from closed unix domain socket other' side.
Sometimes, when doing read(2) over unix domain socket, for which the
other side socket was closed, read(2) returns -1/ENOTCONN instead of
EOF AKA zero-size read. This is because soreceive_generic() does not
lock socket when testing the so_state SS_ISCONNECTED|SS_ISCONNECTING
flags. It could end up that we do not observe so->so_rcv.sb_state bit
SBS_CANTRCVMORE, and then miss SS_ flags.
Change the test to check that the socket was never connected before
returning ENOTCONN, by adding all state bits for connected.
Reported and tested by: pho
In collaboration with: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D24819
Kyle Evans [Thu, 14 May 2020 17:52:29 +0000 (17:52 +0000)]
inetd(8): Add comments to all examples
Submitted by: debdrup (with some minor changes by kevans)
Reviewed by: bcr (manpages)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D24818