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freebsd-dev/sys/kern
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Edward Tomasz Napierala 92001b9497 Change the default setting of kern.ipc.shm_allow_removed from 0 to 1. 
This removes the need for manually changing this flag for Google Chrome
users. It also improves compatibility with Linux applications running under
Linuxulator compatibility layer, and possibly also helps in porting software
from Linux.

Generally speaking, the flag allows applications to create the shared memory
segment, attach it, remove it, and then continue to use it and to reattach it
later. This means that the kernel will automatically "clean up" after the
application exits.

It could be argued that it's against POSIX. However, SUSv3 says this
about IPC_RMID: "Remove the shared memory identifier specified by shmid from
the system and destroy the shared memory segment and shmid_ds data structure
associated with it." From my reading, we break it in any case by deferring
removal of the segment until it's detached; we won't break it any more
by also deferring removal of the identifier.

This is the behaviour exhibited by Linux since... probably always, and
also by OpenBSD since the following commit:

revision 1.54
date: 2011/10/27 07:56:28; author: robert; state: Exp; lines: +3 -8;
Allow segments to be used even after they were marked for deletion with
the IPC_RMID flag.
This is permitted as an extension beyond the standards and this is similar
to what other operating systems like linux do.

MFC after:	1 month
Relnotes:	yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D3603
2015-10-10 09:29:47 +00:00
..
bus_if.m Add a bus method to fetch the VM domain for the given device/bus. 2014-10-09 05:33:25 +00:00
capabilities.conf Add futimens and utimensat system calls. 2015-01-23 21:07:08 +00:00
clock_if.m
cpufreq_if.m
device_if.m Change the default method for device_quiesce() to return 0 instead of 2015-01-08 21:46:28 +00:00
genassym.sh genassym.sh: call nm(1) with NMFLAGS. 2015-08-14 22:57:13 +00:00
imgact_aout.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
imgact_binmisc.c At the suggestion of jhb, replace atomic_set/clear calls with use of 2015-06-24 15:52:26 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Fix core corruption caused by race in note_procstat_vmmap 2015-10-06 18:07:00 +00:00
imgact_gzip.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
imgact_shell.c Allow multiple image activators to run on the same execution by changing 2014-09-04 21:31:25 +00:00
inflate.c
init_main.c Remove now obsolete comment. 2015-08-28 20:06:58 +00:00
init_sysent.c Add an initial NUMA affinity/policy configuration for threads and processes. 2015-07-11 15:21:37 +00:00
kern_acct.c
kern_alq.c
kern_clock.c Initialize ticks so that it wraps 10 minutes after boot to increase the 2015-02-05 01:43:21 +00:00
kern_clocksource.c Fix typo in comment. 2015-07-20 09:37:42 +00:00
kern_condvar.c Revert r282971. It depends on condvar consumers not destroying condvars 2015-05-21 16:43:26 +00:00
kern_conf.c Fix for out of order device destruction notifications when using the 2015-03-22 13:11:56 +00:00
kern_cons.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
kern_context.c
kern_cpu.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_cpuset.c Un-static cpuset_which() - it's useful in other contexts, such as some 2015-06-26 04:14:05 +00:00
kern_ctf.c Don't specify a resid parameter if we're just going to ignore it. Instead, 2015-02-20 20:49:00 +00:00
kern_descrip.c fd: make rights a mandatory argument to fgetvp_rights 2015-09-07 20:05:56 +00:00
kern_dtrace.c
kern_dump.c Factor out duplicated code from dumpsys() on each architecture into generic 2015-01-07 01:01:39 +00:00
kern_environment.c Test if 'env' is NULL before doing memset() and strlen(), 2014-10-23 18:23:50 +00:00
kern_et.c Trivial change / forced-commit to document prior change that slipped in 2015-03-16 19:29:19 +00:00
kern_event.c kqueue: simplify kern_kqueue by not refing/unrefing creds too early 2015-09-23 12:45:08 +00:00
kern_exec.c Fix core corruption caused by race in note_procstat_vmmap 2015-10-06 18:07:00 +00:00
kern_exit.c Enforce the maxproc limitation before allocating struct proc, initial 2015-10-08 11:07:09 +00:00
kern_fail.c Use a regular sbuf + SYSCTL_OUT() rather than sbuf_new_for_sysctl() with 2015-03-16 19:18:45 +00:00
kern_ffclock.c The SYSCTL data pointers can come from userspace and must not be 2014-10-28 12:00:39 +00:00
kern_fork.c Enforce the maxproc limitation before allocating struct proc, initial 2015-10-08 11:07:09 +00:00
kern_gzio.c Move zlib.c from net to libkern. 2015-04-22 14:38:58 +00:00
kern_hhook.c
kern_idle.c
kern_intr.c The part of r285680 which removed release semantic for two stores to 2015-07-21 14:39:34 +00:00
kern_jail.c Add support to the jail framework to be able to mount linsysfs(5) and 2015-07-19 08:52:35 +00:00
kern_khelp.c
kern_kthread.c Limit rights on process descriptors. 2015-07-31 10:21:58 +00:00
kern_ktr.c Expand ktr_mask to be a 64-bit unsigned integer. 2015-05-22 11:09:41 +00:00
kern_ktrace.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_linker.c sysctl: switch sysctllock to a sleepable rmlock, take 2 2015-09-15 23:06:56 +00:00
kern_lock.c Don't modify curthread->td_locks unless INVARIANTS is enabled. 2015-08-02 00:03:08 +00:00
kern_lockf.c Improve style and fix a possible use-after-free case introduced in r268384 2015-01-10 06:48:35 +00:00
kern_lockstat.c Consistently use a reader/writer flag for lockstat probes in rwlock(9) and 2015-07-19 22:24:33 +00:00
kern_loginclass.c cred: add proc_set_cred helper 2015-03-16 00:10:03 +00:00
kern_malloc.c The vmem callback to reclaim kmem arena address space on low or 2015-05-09 20:08:36 +00:00
kern_mbuf.c Fix integer truncation bug in malloc(9) 2015-04-01 12:42:26 +00:00
kern_mib.c Huge cleanup of random(4) code. 2015-06-30 17:00:45 +00:00
kern_module.c Provide better debug message on kernel module name clash. 2015-10-10 09:21:55 +00:00
kern_mtxpool.c
kern_mutex.c Don't modify curthread->td_locks unless INVARIANTS is enabled. 2015-08-02 00:03:08 +00:00
kern_ntptime.c Use the monotonic (uptime) counter rather than time-of-day to measure elapsed 2015-07-12 18:38:17 +00:00
kern_numa.c Add an initial NUMA affinity/policy configuration for threads and processes. 2015-07-11 15:21:37 +00:00
kern_osd.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_physio.c Rewrite physio() to not allocate pbufs for unmapped I/O. 2015-04-21 10:55:53 +00:00
kern_pmc.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_poll.c When a kernel has DEVICE_POLLING turned on but no drivers have 2015-04-14 14:22:34 +00:00
kern_priv.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_proc.c Fix core corruption caused by race in note_procstat_vmmap 2015-10-06 18:07:00 +00:00
kern_procctl.c If process becomes reaper (procctl(PROC_REAP_ACQUIRE)) while already 2015-08-20 22:44:26 +00:00
kern_prot.c Get rid of lim_update_thread and cred_update_thread. 2015-07-16 14:30:11 +00:00
kern_racct.c save some bytes by using more concise SDT_PROBE<n> instead of SDT_PROBE 2015-09-28 12:14:16 +00:00
kern_rangelock.c
kern_rctl.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
kern_resource.c Get rid of lim_update_thread and cred_update_thread. 2015-07-16 14:30:11 +00:00
kern_rmlock.c Threads holding a read lock of a sleepable rm lock are not permitted 2015-09-15 22:16:21 +00:00
kern_rwlock.c Don't modify curthread->td_locks unless INVARIANTS is enabled. 2015-08-02 00:03:08 +00:00
kern_sdt.c
kern_sema.c
kern_sharedpage.c Copy the fencing of the algorithm to do lock-less update and reading 2015-08-04 12:33:51 +00:00
kern_shutdown.c Disable suspend when we're shutting down. This solves the "tell FreeBSD 2015-10-01 10:52:26 +00:00
kern_sig.c save some bytes by using more concise SDT_PROBE<n> instead of SDT_PROBE 2015-09-28 12:14:16 +00:00
kern_switch.c Revert for r277213: 2015-01-22 11:12:42 +00:00
kern_sx.c Don't modify curthread->td_locks unless INVARIANTS is enabled. 2015-08-02 00:03:08 +00:00
kern_synch.c Remove several write-only variables, all reported by the gcc 4.9 2015-05-29 13:24:17 +00:00
kern_syscalls.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
kern_sysctl.c sysctl: switch sysctllock to a sleepable rmlock, take 2 2015-09-15 23:06:56 +00:00
kern_tc.c Use per-cpu values for base and last in tc_cpu_ticks(). The values 2015-09-25 13:03:57 +00:00
kern_thr.c Add an API for easily creating userspace threads in kernelspace. 2015-07-20 10:20:04 +00:00
kern_thread.c Get rid of lim_update_thread and cred_update_thread. 2015-07-16 14:30:11 +00:00
kern_time.c Fix an off by one in ppsratecheck(). If you asked for N=1 you'd get one, 2015-01-11 20:48:29 +00:00
kern_timeout.c save some bytes by using more concise SDT_PROBE<n> instead of SDT_PROBE 2015-09-28 12:14:16 +00:00
kern_umtx.c Fix bad arithmetic in umtx_key_get() to compute object offset. 2015-08-04 06:01:13 +00:00
kern_uuid.c
kern_xxx.c
ksched.c Use P1B_PRIO_MAX to designate max posix priority for the RR/FIFO 2015-08-30 18:02:57 +00:00
link_elf_obj.c Add support for weak symbols to the kernel linkers. It means that 2015-09-20 01:27:59 +00:00
link_elf.c Add support for weak symbols to the kernel linkers. It means that 2015-09-20 01:27:59 +00:00
linker_if.m
Make.tags.inc
Makefile
makesyscalls.sh Import the CloudABI datatypes and create a system call table. 2015-07-09 07:20:15 +00:00
md4c.c
md5c.c
p1003_1b.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:44:06 +00:00
posix4_mib.c
sched_4bsd.c kgdb uses td_oncpu to determine if a thread is running and should use 2015-08-03 20:43:36 +00:00
sched_ule.c Summary: Add the interactivity equations to the header comment for our 2015-08-26 16:36:41 +00:00
serdev_if.m
stack_protector.c Use nitems() macro instead of __arraycount() 2015-06-16 20:19:00 +00:00
subr_acl_nfs4.c Expose an interface to determine if an ACE is inherited. 2015-09-04 00:14:20 +00:00
subr_acl_posix1e.c
subr_autoconf.c
subr_blist.c
subr_bufring.c
subr_bus_dma.c
subr_bus.c Huge cleanup of random(4) code. 2015-06-30 17:00:45 +00:00
subr_busdma_bufalloc.c Fix integer truncation bug in malloc(9) 2015-04-01 12:42:26 +00:00
subr_capability.c
subr_clock.c For architectures where time_t is wide enough, in particular, 64bit 2014-12-12 09:37:18 +00:00
subr_counter.c
subr_devstat.c Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
subr_disk.c
subr_dummy_vdso_tc.c Update the vdso timehands only via tc_windup(). 2015-01-20 03:54:30 +00:00
subr_eventhandler.c
subr_fattime.c Where appropriate, use the modern terms for the one true time base 2014-12-21 05:07:11 +00:00
subr_firmware.c Create a dedicated function for ensuring that cdir and rdir are populated. 2015-07-11 16:22:48 +00:00
subr_hash.c
subr_hints.c Add a new device control utility for new-bus devices called devctl. This 2015-02-06 16:09:01 +00:00
subr_kdb.c Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
subr_kobj.c
subr_lock.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
subr_log.c
subr_mbpool.c All mbuf external free functions never fail, so let them be void. 2014-07-11 13:58:48 +00:00
subr_mchain.c
subr_module.c preload_search_info: make sure mod is set 2015-08-21 15:57:57 +00:00
subr_msgbuf.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
subr_param.c Ensure that maxproc does not exceed pid_max, at the time of boot. 2015-09-21 15:02:59 +00:00
subr_pcpu.c
subr_pctrie.c
subr_power.c
subr_prf.c Add support for reading MAM attributes to camcontrol(8) and libcam(3). 2015-06-09 21:39:38 +00:00
subr_prof.c The process spin lock currently has the following distinct uses: 2014-11-26 14:10:00 +00:00
subr_rman.c Nuke the never-used RF_TIMESHARE feature, reducing the complexity of the 2014-07-16 22:18:19 +00:00
subr_rtc.c
subr_sbuf.c Fail the sbuf if vsnprintf(3) fails. 2015-10-02 09:23:14 +00:00
subr_scanf.c
subr_sfbuf.c Move KASSERT into locked region. 2014-08-11 15:06:07 +00:00
subr_sglist.c Fix a couple of panics when detaching from a cxgbe/cxl interface that was 2015-01-26 16:26:28 +00:00
subr_sleepqueue.c Revert for r277213: 2015-01-22 11:12:42 +00:00
subr_smp.c The smp_rendezvous_cpus() function should ensure that all accesses 2015-07-21 22:56:46 +00:00
subr_stack.c
subr_syscall.c Fix various edge cases related to system call tracing. 2015-10-06 19:29:05 +00:00
subr_taskqueue.c MFuser/delphij/zfs-arc-rebase@r281754: 2015-05-26 01:40:33 +00:00
subr_terminal.c vt(4): Adjust the cursor position after changing the window size 2014-11-01 17:05:15 +00:00
subr_trap.c racct: perform a lockless check for p_throttled 2015-07-13 22:52:11 +00:00
subr_turnstile.c ddb: finish converting boolean values. 2015-05-21 15:16:18 +00:00
subr_uio.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
subr_unit.c
subr_vmem.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
subr_witness.c o Revert the other functional half of r239864, i. e. the merge of r134227 2015-07-24 15:13:21 +00:00
sys_capability.c Introduce kern_cap_rights_limit(). 2015-08-11 08:43:50 +00:00
sys_generic.c Cover a race between doselwakeup() and selfdfree(). If doselwakeup() 2015-07-09 09:22:21 +00:00
sys_pipe.c Make pipes in CloudABI work. 2015-07-29 17:18:27 +00:00
sys_procdesc.c The si_status field of the siginfo_t, provided by the waitid(2) and 2015-07-18 09:02:50 +00:00
sys_process.c Include additional info in ptrace(2) KTR traces: 2015-10-05 21:36:53 +00:00
sys_socket.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
syscalls.c Regenerate syscalls. 2015-07-11 15:22:11 +00:00
syscalls.master Regenerate syscalls. 2015-07-11 15:22:11 +00:00
systrace_args.c Regenerate syscalls. 2015-07-11 15:22:11 +00:00
sysv_ipc.c
sysv_msg.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
sysv_sem.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
sysv_shm.c Change the default setting of kern.ipc.shm_allow_removed from 0 to 1. 2015-10-10 09:29:47 +00:00
tty_compat.c
tty_info.c
tty_inq.c
tty_outq.c
tty_pts.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
tty_tty.c tty: replace several curthread->td_proc with stored curproc 2015-07-06 18:53:56 +00:00
tty_ttydisc.c
tty.c filedesc: simplify fget_unlocked & friends 2015-02-17 23:54:06 +00:00
uipc_accf.c The accept filter code is not specific to the FreeBSD IPv4 network stack, 2014-07-26 19:27:34 +00:00
uipc_debug.c Fix sb_state constant names as used e.g. to display in DDB ``show sockbuf''. 2015-07-21 09:57:13 +00:00
uipc_domain.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
uipc_mbuf2.c Add const-qualifiers for source mbuf argument in m_dup(), m_copym(), 2015-08-08 15:50:46 +00:00
uipc_mbuf.c Fix regression from r248371. We need to copy packet header to new 2015-10-07 12:40:00 +00:00
uipc_mbufhash.c Reduce header pollution. 2015-03-17 14:16:50 +00:00
uipc_mqueue.c fd: remove filedesc argument from fdclose 2015-04-11 15:40:28 +00:00
uipc_sem.c Call ksem_get() with initialized 'rights'. 2015-07-23 23:18:03 +00:00
uipc_shm.c Add kern_shm_open(). 2015-08-01 07:21:14 +00:00
uipc_sockbuf.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
uipc_socket.c Make shutdown() return ENOTCONN as required by POSIX, part deux. 2015-07-27 13:17:57 +00:00
uipc_syscalls.c Make shutdown() return ENOTCONN as required by POSIX, part deux. 2015-07-27 13:17:57 +00:00
uipc_usrreq.c fd: make the common case in filecaps_copy work lockless 2015-09-07 20:02:56 +00:00
vfs_acl.c Replace struct filedesc argument in getvnode with struct thread 2015-06-16 13:09:18 +00:00
vfs_aio.c Mutex memory is not zeroed, add MTX_NEW. 2015-07-06 14:09:00 +00:00
vfs_bio.c Perform a single batched update to the object's paging-in-progress count 2015-10-03 17:04:52 +00:00
vfs_cache.c save some bytes by using more concise SDT_PROBE<n> instead of SDT_PROBE 2015-09-28 12:14:16 +00:00
vfs_cluster.c Refactor unmapped buffer address handling. 2015-07-23 19:13:41 +00:00
vfs_default.c Ensure that vop_stdadvise() does not call getblk() on vnodes that have an 2015-10-01 16:34:53 +00:00
vfs_export.c After the changes in r274118 make NOIP kernels compile by hiding an 2014-11-06 12:19:39 +00:00
vfs_extattr.c Replace struct filedesc argument in getvnode with struct thread 2015-06-16 13:09:18 +00:00
vfs_hash.c Track changes to kern.maxvnodes and appropriately increase or decrease 2015-09-06 05:50:51 +00:00
vfs_init.c sysctl: switch sysctllock to a sleepable rmlock, take 2 2015-09-15 23:06:56 +00:00
vfs_lookup.c save some bytes by using more concise SDT_PROBE<n> instead of SDT_PROBE 2015-09-28 12:14:16 +00:00
vfs_mount.c Make vfs_unmountall() unmount /dev after /, not before. The only 2015-08-24 13:18:13 +00:00
vfs_mountroot.c Remove root_mount_wait(). It's not used anywhere. 2015-10-09 12:11:37 +00:00
vfs_subr.c Remove a check for a condition that is always false by a preceding KASSERT 2015-09-26 22:26:55 +00:00
vfs_syscalls.c Revert r288628 and instead fix a discrepancy between the posix_fadvise(2) 2015-10-03 22:27:14 +00:00
vfs_vnops.c Fix r283998 that broke mapin events for hwpmc. 2015-10-08 09:54:33 +00:00
vnode_if.src kevent(2): Note DOOMED vnodes with NOTE_REVOKE 2015-09-15 20:22:30 +00:00