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* snp: don't reference tp->t_mtx directlyKyle Evans2019-11-291-1/+1
| | | | | | | | This is the only part of snp(4) that pokes around in struct tty directly; replace it with the tty_getlock accessor to avoid struct tty internals. Notes: svn path=/head/; revision=355205
* sys/dev: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326255
* Commit the 64-bit inode project.Konstantin Belousov2017-05-231-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the ino_t, dev_t, nlink_t types to 64-bit ints. Modify struct dirent layout to add d_off, increase the size of d_fileno to 64-bits, increase the size of d_namlen to 16-bits, and change the required alignment. Increase struct statfs f_mntfromname[] and f_mntonname[] array length MNAMELEN to 1024. ABI breakage is mitigated by providing compatibility using versioned symbols, ingenious use of the existing padding in structures, and by employing other tricks. Unfortunately, not everything can be fixed, especially outside the base system. For instance, third-party APIs which pass struct stat around are broken in backward and forward incompatible ways. Kinfo sysctl MIBs ABI is changed in backward-compatible way, but there is no general mechanism to handle other sysctl MIBS which return structures where the layout has changed. It was considered that the breakage is either in the management interfaces, where we usually allow ABI slip, or is not important. Struct xvnode changed layout, no compat shims are provided. For struct xtty, dev_t tty device member was reduced to uint32_t. It was decided that keeping ABI compat in this case is more useful than reporting 64-bit dev_t, for the sake of pstat. Update note: strictly follow the instructions in UPDATING. Build and install the new kernel with COMPAT_FREEBSD11 option enabled, then reboot, and only then install new world. Credits: The 64-bit inode project, also known as ino64, started life many years ago as a project by Gleb Kurtsou (gleb). Kirk McKusick (mckusick) then picked up and updated the patch, and acted as a flag-waver. Feedback, suggestions, and discussions were carried by Ed Maste (emaste), John Baldwin (jhb), Jilles Tjoelker (jilles), and Rick Macklem (rmacklem). Kris Moore (kris) performed an initial ports investigation followed by an exp-run by Antoine Brodin (antoine). Essential and all-embracing testing was done by Peter Holm (pho). The heavy lifting of coordinating all these efforts and bringing the project to completion were done by Konstantin Belousov (kib). Sponsored by: The FreeBSD Foundation (emaste, kib) Differential revision: https://reviews.freebsd.org/D10439 Notes: svn path=/head/; revision=318736
* Second-to-last commit implementing Capsicum capabilities in the FreeBSDRobert Watson2011-08-111-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kernel for FreeBSD 9.0: Add a new capability mask argument to fget(9) and friends, allowing system call code to declare what capabilities are required when an integer file descriptor is converted into an in-kernel struct file *. With options CAPABILITIES compiled into the kernel, this enforces capability protection; without, this change is effectively a no-op. Some cases require special handling, such as mmap(2), which must preserve information about the maximum rights at the time of mapping in the memory map so that they can later be enforced in mprotect(2) -- this is done by narrowing the rights in the existing max_protection field used for similar purposes with file permissions. In namei(9), we assert that the code is not reached from within capability mode, as we're not yet ready to enforce namespace capabilities there. This will follow in a later commit. Update two capability names: CAP_EVENT and CAP_KEVENT become CAP_POST_KEVENT and CAP_POLL_KEVENT to more accurately indicate what they represent. Approved by: re (bz) Submitted by: jonathan Sponsored by: Google Inc Notes: svn path=/head/; revision=224778
* Fix whitespace inconsistencies in the TTY layer and its drivers owned by me.Ed Schouten2011-06-261-2/+2
| | | | Notes: svn path=/head/; revision=223575
* Add ttydisc_rint_simple().Ed Schouten2009-08-231-8/+3
| | | | | | | | | | | | I noticed several drivers in our tree don't actually care about parity and framing, such as pts(4), snp(4) (and my partially finished console driver). Instead of duplicating a lot of code, I think we'd better add a utility function for those drivers to quickly process a buffer of input. Also change pts(4) and snp(4) to use this function. Notes: svn path=/head/; revision=196452
* Keep this line shorter than 80 columns.Ed Schouten2009-05-131-2/+2
| | | | Notes: svn path=/head/; revision=192062
* Add macros around the sx operations in snp(4).Ed Schouten2009-05-111-4/+15
| | | | | | | | | As an experiment, I changed snp(4) to use a mutex instead of an sx lock. We can't enable this right now, because Syscons still picks up Giant. It's nice to already have the framework there. Notes: svn path=/head/; revision=191999
* Slightly improve the design of the TTY buffer.Ed Schouten2009-02-031-1/+0
| | | | | | | | | | | | | | | | | | | | | | The TTY buffers used the standard <sys/queue.h> lists. Unfortunately they have a big shortcoming. If you want to have a double linked list, but no tail pointer, it's still not possible to obtain the previous element in the list. Inside the buffers we don't need them. This is why I switched to custom linked list macros. The macros will also keep track of the amount of items in the list. Because it doesn't use a sentinel, we can just initialize the queues with zero. In its simplest form (the output queue), we will only keep two references to blocks in the queue, namely the head of the list and the last block in use. All free blocks are stored behind the last block in use. I noticed there was a very subtle bug in the previous code: in a very uncommon corner case, it would uma_zfree() a block in the queue before calling memcpy() to extract the data from the block. Notes: svn path=/head/; revision=188096
* Change ttyhook_register() second argument from thread to process pointer.Alexander Motin2008-12-131-1/+2
| | | | | | | | Thread was not really needed there, while previous ng_tty implementation that used thread pointer had locking issues (using sx while holding mutex). Notes: svn path=/head/; revision=186056
* Reintroduce the snp(4) driver.Ed Schouten2008-11-051-515/+229
| | | | | | | | | | | | | | | Because the TTY hooks interface was not finished when I imported the MPSAFE TTY layer, I had to disconnect the snp(4) driver. This snp(4) implementation has been sitting in my P4 branch for some time now. Unfortunately it still doesn't use the same error handling as snp(4) (returning codes through FIONREAD), but it should already be usable. I'm committing this to SVN, hoping someone else could polish off its rough edges. It's always better than having a broken driver sitting in the tree. Notes: svn path=/head/; revision=184689
* Even though snp(4) in SVN is still broken, remove the unneeded D_NEEDMINOR.Ed Schouten2008-09-191-1/+1
| | | | | | | | | | | | kib@ and I have decided we will MFC the bpf(4)/snp(4) fixes after we've released 7.1. Make sure the code in HEAD doesn't refer to a flag we don't need anyway. snp(4) in the MPSAFE TTY P4 branch already works, but still needs some polishing before it can be integrated to SVN. Notes: svn path=/head/; revision=183180
* Convert the snp(4) driver to use cdevpriv.Ed Schouten2008-08-151-66/+46
| | | | | | | | | | | | | | | | Now we have a single /dev/snp device node, which can be opened by watch(8) multiple times. Even though snp(4) will be dead as of next week, it's nice having this in SVN, because: - We may want to MFC it to RELENG_7. - By the time we fix snp(4) again, it's already there, existing watch(8) binaries should already work. Just like bpf(4), I'm adding a symlink from snp0 to snp to remain binary compatible. Notes: svn path=/head/; revision=181755
* Don't enforce unique device minor number policy anymore.Ed Schouten2008-06-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | Except for the case where we use the cloner library (clone_create() and friends), there is no reason to enforce a unique device minor number policy. There are various drivers in the source tree that allocate unr pools and such to provide minor numbers, without using them themselves. Because we still need to support unique device minor numbers for the cloner library, introduce a new flag called D_NEEDMINOR. All cdevsw's that are used in combination with the cloner library should be marked with this flag to make the cloning work. This means drivers can now freely use si_drv0 to store their own flags and state, making it effectively the same as si_drv1 and si_drv2. We still keep the minor() and dev2unit() routines around to make drivers happy. The NTFS code also used the minor number in its hash table. We should not do this anymore. If the si_drv0 field would be changed, it would no longer end up in the same list. Approved by: philip (mentor) Notes: svn path=/head/; revision=179726
* Move the check for the snp device being already attached after theKonstantin Belousov2007-12-241-11/+6
| | | | | | | | | | | | | | | | | | | fget() call, that is sleeping point, and possibly dropping Giant. The snp_target == NULL implies the snp_tty == NULL. Remove the code that is put under snp_target == NULL and snp_tty != NULL clause. In snpclose(), do the snp_detach() before scheduling the snp device destruction. Otherwise, after the return from snpclose(), the snp device is already removed from the snp_list, but tty is still in snooped state. Any attempt to do i/o on such tty cause panic because ttytosnp() returns NULL. Tested by: Peter Holm MFC after: 1 week Notes: svn path=/head/; revision=174888
* Do not allow the SNPSTTY ioctl for the snoop device that has a ttyKonstantin Belousov2007-12-031-0/+3
| | | | | | | | | | | attached. Otherwise, the snp->snp_tty would be overwritten, while the tty line discipline still set to the snpdisc. Then snplwrite() causes panic because ttytosnp() cannot find the snp. MFC after: 1 week Notes: svn path=/head/; revision=174219
* Adopt snp to the destroy_dev_sched() KPI after reverting of destroy_dev()Konstantin Belousov2007-07-051-8/+9
| | | | | | | | | | to not call destroy_dev_sched(). Tested by: Peter Holm Approved by: re (kensmith) Notes: svn path=/head/; revision=171252
* Use make_dev_credf(MAKEDEV_REF) instead of make_dev() from snp clone handler.Konstantin Belousov2007-07-031-3/+4
| | | | | | | | | | Drain clone events and cdev destruction from the module unload handler. Debugging help and testing by: Peter Holm Approved by: re (kensmith) Notes: svn path=/head/; revision=171183
* Switch to ANSI function declarations.Craig Rodrigues2007-03-231-54/+16
| | | | Notes: svn path=/head/; revision=167851
* Restore the ability to detach from a tty via SIOCSTTY and documentRuslan Ermilov2005-09-191-5/+5
| | | | | | | | | recent changes in a manpage. Reviewed by: cognet Notes: svn path=/head/; revision=150322
* Slightly change the API for the SNPSTTY ioctl so that the userland nowOlivier Houchard2005-09-181-5/+14
| | | | | | | | | | provides a file descriptor instead of a dev_t. Discussed with: phk MFC after: 3 days Notes: svn path=/head/; revision=150298
* Merge the dev_clone and dev_clone_cred event handlers into a singleRobert Watson2005-08-081-2/+3
| | | | | | | | | | | | | | | | event handler, dev_clone, which accepts a credential argument. Implementors of the event can ignore it if they're not interested, and most do. This avoids having multiple event handler types and fall-back/precedence logic in devfs. This changes the kernel API for /dev cloning, and may affect third party packages containg cloning kernel modules. Requested by: phk MFC after: 3 days Notes: svn path=/head/; revision=148868
* Explicitly hold a reference to the cdev we have just cloned. ThisPoul-Henning Kamp2005-03-311-1/+3
| | | | | | | | closes the race where the cdev was reclaimed before it ever made it back to devfs lookup. Notes: svn path=/head/; revision=144389
* Disable two users of findcdev. They do the wrong thing now and willPoul-Henning Kamp2005-03-151-0/+4
| | | | | | | | need to be fixed. In both cases the API should be reengineered to do something (more) sensible. Notes: svn path=/head/; revision=143637
* Start each of the license/copyright comments with /*-, minor shuffle of linesWarner Losh2005-01-061-1/+1
| | | | Notes: svn path=/head/; revision=139749
* Include fcntl.h not vnode.h.Poul-Henning Kamp2004-12-221-2/+3
| | | | | | | | Include uio.h instead of relying on vnode.h to do so. Check O_NONBLOCK not IO_NDELAY. Notes: svn path=/head/; revision=139195
* Walk through the snp softc list instead of abusing tp->ts_c to find theOlivier Houchard2004-11-051-8/+17
| | | | | | | | snp attached to a tty. This fixes the panic that happens when using snp. Notes: svn path=/head/; revision=137265
* Hold thread reference while we frob cdevsw.Poul-Henning Kamp2004-09-241-3/+9
| | | | Notes: svn path=/head/; revision=135724
* Preparation commit for the tty cleanups that will follow in the nearPoul-Henning Kamp2004-07-151-1/+1
| | | | | | | | | | | | future: rename ttyopen() -> tty_open() and ttyclose() -> tty_close(). We need the ttyopen() and ttyclose() for the new generic cdevsw functions for tty devices in order to have consistent naming. Notes: svn path=/head/; revision=132226
* Do a pass over all modules in the kernel and make them return EOPNOTSUPPPoul-Henning Kamp2004-07-151-0/+1
| | | | | | | | | | | for unknown events. A number of modules return EINVAL in this instance, and I have left those alone for now and instead taught MOD_QUIESCE to accept this as "didn't do anything". Notes: svn path=/head/; revision=132199
* Switch snoop device to using C99 initialization for struct linesw.Robert Watson2004-07-141-2/+8
| | | | Notes: svn path=/head/; revision=132133
* Second half of the dev_t cleanup.Poul-Henning Kamp2004-06-171-7/+7
| | | | | | | | | | | | | | The big lines are: NODEV -> NULL NOUDEV -> NODEV udev_t -> dev_t udev2dev() -> findcdev() Various minor adjustments including handling of userland access to kernel space struct cdev etc. Notes: svn path=/head/; revision=130640
* Do the dreaded s/dev_t/struct cdev */Poul-Henning Kamp2004-06-161-12/+12
| | | | | | | Bump __FreeBSD_version accordingly. Notes: svn path=/head/; revision=130585
* Add missing <sys/module.h> includesPoul-Henning Kamp2004-05-301-0/+1
| | | | Notes: svn path=/head/; revision=129879
* Add clone_setup() function rather than rely on lazy initialization.Poul-Henning Kamp2004-03-111-0/+1
| | | | | | | Requested by: rwatson Notes: svn path=/head/; revision=126845
* Don't set d_flags twice. The second setting clobbered D_NOGIANT.Bruce Evans2004-02-241-2/+1
| | | | Notes: svn path=/head/; revision=126188
* Device megapatch 5/6:Poul-Henning Kamp2004-02-211-1/+1
| | | | | | | | | | | | | | | Remove the unused second argument from udev2dev(). Convert all remaining users of makedev() to use udev2dev(). The semantic difference is that udev2dev() will only locate a pre-existing dev_t, it will not line makedev() create a new one. Apart from the tiny well controlled windown in D_PSEUDO drivers, there should no longer be any "anonymous" dev_t's in the system now, only dev_t's created with make_dev() and make_dev_alias() Notes: svn path=/head/; revision=126081
* Device megapatch 4/6:Poul-Henning Kamp2004-02-211-0/+2
| | | | | | | | | | | Introduce d_version field in struct cdevsw, this must always be initialized to D_VERSION. Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing four D_NOGIANT flags and adding 145 D_NEEDGIANT flags. Notes: svn path=/head/; revision=126080
* Device megapatch 2/6:Poul-Henning Kamp2004-02-211-18/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit adds a couple of functions for pseudodrivers to use for implementing cloning in a manner we will be able to lock down (shortly). Basically what happens is that pseudo drivers get a way to ask for "give me the dev_t with this unit number" or alternatively "give me a dev_t with the lowest guaranteed free unit number" (there is unfortunately a lot of non-POLA in the exact numeric value of this number, just live with it for now) Managing the unit number space this way removes the need to use rman(9) to do so in the drivers this greatly simplifies the code in the drivers because even using rman(9) they still needed to manage their dev_t's anyway. I have taken the if_tun, if_tap, snp and nmdm drivers through the mill, partly because they (ab)used makedev(), but mostly because together they represent three different problems for device-cloning: if_tun and snp is the plain case: just give me a device. if_tap has two kinds of devices, with a flag for device type. nmdm has paired devices (ala pty) can you can clone either of them. Notes: svn path=/head/; revision=126077
* - Implement selwakeuppri() which allows raising the priority of aSeigo Tanimura2003-11-091-2/+2
| | | | | | | | | | | | | | | | thread being waken up. The thread waken up can run at a priority as high as after tsleep(). - Replace selwakeup()s with selwakeuppri()s and pass appropriate priorities. - Add cv_broadcastpri() which raises the priority of the broadcast threads. Used by selwakeuppri() if collision occurs. Not objected in: -arch, -current Notes: svn path=/head/; revision=122352
* Use __FBSDID().David E. O'Brien2003-08-241-1/+3
| | | | | | | Also some minor style cleanups. Notes: svn path=/head/; revision=119419
* Gigacommit to improve device-driver source compatibility betweenPoul-Henning Kamp2003-03-031-13/+8
| | | | | | | | | | | | | | | | branches: Initialize struct cdevsw using C99 sparse initializtion and remove all initializations to default values. This patch is automatically generated and has been tested by compiling LINT with all the fields in struct cdevsw in reverse order on alpha, sparc64 and i386. Approved by: re(scottl) Notes: svn path=/head/; revision=111815
* More low-hanging fruit: kill caddr_t in calls to wakeup(9) / [mt]sleep(9).Dag-Erling Smørgrav2003-03-021-3/+3
| | | | Notes: svn path=/head/; revision=111748
* msgPoul-Henning Kamp2003-02-261-2/+0
| | | | Notes: svn path=/head/; revision=111571
* Back out M_* changes, per decision of the TRB.Warner Losh2003-02-191-4/+4
| | | | | | | Approved by: trb Notes: svn path=/head/; revision=111119
* Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.Alfred Perlstein2003-01-211-4/+4
| | | | | | | Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT. Notes: svn path=/head/; revision=109623
* Declare the snp ioctl()s to work on udev_t, since that is what theyThomas Moestl2002-11-111-1/+1
| | | | | | | | | | really do and dev_t is defined differently in kernel and userland. Return a correctly formed udev from SNPGTTY. Reviewed by: dd Notes: svn path=/head/; revision=106767
* Treat input on the snp device as an `unsigned char'. According to theDima Dorfman2002-04-101-1/+1
| | | | | | | | | | | submitter, this permits Russian (and probably other locales') characters to be entered via watch(8). PR: 35636 Submitted by: Gleb Smirnoff <glebius@rinet.ru> Notes: svn path=/head/; revision=94341
* Remove __P.Alfred Perlstein2002-03-201-7/+7
| | | | Notes: svn path=/head/; revision=92739
* Fixes to make select/poll mpsafe.Alfred Perlstein2002-03-141-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Problem: selwakeup required calling pfind which would cause lock order reversals with the allproc_lock and the per-process filedesc lock. Solution: Instead of recording the pid of the select()'ing process into the selinfo structure, actually record a pointer to the thread. To avoid dereferencing a bad address all the selinfo structures that are in use by a thread are kept in a list hung off the thread (protected by sellock). When a selwakeup occurs the selinfo is removed from that threads list, it is also removed on the way out of select or poll where the thread will traverse its list removing all the selinfos from its own list. Problem: Previously the PROC_LOCK was used to provide the mutual exclusion needed to ensure proper locking, this couldn't work because there was a single condvar used for select and poll and condvars can only be used with a single mutex. Solution: Introduce a global mutex 'sellock' which is used to provide mutual exclusion when recording events to wait on as well as performing notification when an event occurs. Interesting note: schedlock is required to manipulate the per-thread TDF_SELECT flag, however if given its own field it would not need schedlock, also because TDF_SELECT is only manipulated under sellock one doesn't actually use schedlock for syncronization, only to protect against corruption. Proc locks are no longer used in select/poll. Portions contributed by: davidc Notes: svn path=/head/; revision=92252
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