sysv_shm.c File Reference

#include <sys/cdefs.h>
#include "opt_sysvipc.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/abi_compat.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/sysctl.h>
#include <sys/shm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/racct.h>
#include <sys/resourcevar.h>
#include <sys/rwlock.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/jail.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>

Include dependency graph for sysv_shm.c:

Go to the source code of this file.

Data Structures
struct	shmmap_state
struct	shmdt_args
struct	shmat_args
struct	shmctl_args
struct	shmget_args

Macros
#define	SHMSEG_FREE   0x0200
#define	SHMSEG_REMOVED   0x0400
#define	SHMSEG_ALLOCATED   0x0800
#define	SHMMAXPGS   131072 /* Note: sysv shared memory is swap backed. */
#define	SHMMAX   (SHMMAXPGS*PAGE_SIZE)
#define	SHMMIN   1
#define	SHMMNI   192
#define	SHMSEG   128
#define	SHMALL   (SHMMAXPGS)
#define	SYSVSHM_LOCK()   sx_xlock(&sysvshmsx)
#define	SYSVSHM_UNLOCK()   sx_xunlock(&sysvshmsx)
#define	SYSVSHM_ASSERT_LOCKED()   sx_assert(&sysvshmsx, SA_XLOCKED)

Functions
	__FBSDID ("$FreeBSD$")
	FEATURE (sysv_shm, "System V shared memory segments support")
static	MALLOC_DEFINE (M_SHM, "shm", "SVID compatible shared memory segments")
static void	shm_deallocate_segment (struct shmid_kernel *)
static int	shm_find_segment_by_key (struct prison *, key_t)
static struct shmid_kernel *	shm_find_segment (struct prison *, int, bool)
static int	shm_delete_mapping (struct vmspace *vm, struct shmmap_state *)
static int	shmget_allocate_segment (struct thread *td, key_t key, size_t size, int mode)
static int	shmget_existing (struct thread *td, size_t size, int shmflg, int mode, int segnum)
static void	shmrealloc (void)
static int	shminit (void)
static int	sysvshm_modload (struct module *, int, void *)
static int	shmunload (void)
static void	shmexit_myhook (struct vmspace *vm)
static void	shmfork_myhook (struct proc *p1, struct proc *p2)
static int	sysctl_shmsegs (SYSCTL_HANDLER_ARGS)
static void	shm_remove (struct shmid_kernel *, int)
static struct prison *	shm_find_prison (struct ucred *)
static int	shm_prison_cansee (struct prison *, struct shmid_kernel *)
static int	shm_prison_check (void *, void *)
static int	shm_prison_set (void *, void *)
static int	shm_prison_get (void *, void *)
static int	shm_prison_remove (void *, void *)
static void	shm_prison_cleanup (struct prison *)
	SYSCTL_ULONG (_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0, "Maximum shared memory segment size")
	SYSCTL_ULONG (_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &shminfo.shmmin, 0, "Minimum shared memory segment size")
	SYSCTL_ULONG (_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, "Number of shared memory identifiers")
	SYSCTL_ULONG (_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, "Number of segments per process")
	SYSCTL_ULONG (_kern_ipc, OID_AUTO, shmall, CTLFLAG_RWTUN, &shminfo.shmall, 0, "Maximum number of pages available for shared memory")
	SYSCTL_INT (_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN, &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core")
	SYSCTL_INT (_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN, &shm_allow_removed, 0, "Enable/Disable attachment to attached segments marked for removal")
	SYSCTL_PROC (_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "", "Array of struct shmid_kernel for each potential shared memory segment")
static int	kern_shmdt_locked (struct thread *td, const void *shmaddr)
int	sys_shmdt (struct thread *td, struct shmdt_args *uap)
static int	kern_shmat_locked (struct thread *td, int shmid, const void *shmaddr, int shmflg)
int	kern_shmat (struct thread *td, int shmid, const void *shmaddr, int shmflg)
int	sys_shmat (struct thread *td, struct shmat_args *uap)
static int	kern_shmctl_locked (struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz)
int	kern_shmctl (struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz)
int	sys_shmctl (struct thread *td, struct shmctl_args *uap)
int	sys_shmget (struct thread *td, struct shmget_args *uap)
static int	shm_prison_remove (void *obj, void *data __unused)
	SYSCTL_JAIL_PARAM_SYS_NODE (sysvshm, CTLFLAG_RW, "SYSV shared memory")
	DECLARE_MODULE (sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST)
	MODULE_VERSION (sysvshm, 1)

Variables
static int	shm_last_free
static int	shm_nused
static int	shmalloced
vm_size_t	shm_committed
static struct shmid_kernel *	shmsegs
static unsigned	shm_prison_slot
struct shminfo	shminfo
static int	shm_use_phys
static int	shm_allow_removed = 1
static struct sx	sysvshmsx
static struct syscall_helper_data	shm_syscalls []
static moduledata_t	sysvshm_mod

Macro Definition Documentation

SHMALL

#define SHMALL   (SHMMAXPGS)

Definition at line 173 of file sysv_shm.c.

SHMMAX

#define SHMMAX   (SHMMAXPGS*PAGE_SIZE)

Definition at line 161 of file sysv_shm.c.

SHMMAXPGS

#define SHMMAXPGS   131072 /* Note: sysv shared memory is swap backed. */

Definition at line 158 of file sysv_shm.c.

SHMMIN

#define SHMMIN   1

Definition at line 164 of file sysv_shm.c.

SHMMNI

#define SHMMNI   192

Definition at line 167 of file sysv_shm.c.

SHMSEG

#define SHMSEG   128

Definition at line 170 of file sysv_shm.c.

SHMSEG_ALLOCATED

#define SHMSEG_ALLOCATED   0x0800

Definition at line 116 of file sysv_shm.c.

SHMSEG_FREE

#define SHMSEG_FREE   0x0200

Definition at line 114 of file sysv_shm.c.

SHMSEG_REMOVED

#define SHMSEG_REMOVED   0x0400

Definition at line 115 of file sysv_shm.c.

SYSVSHM_ASSERT_LOCKED

#define SYSVSHM_ASSERT_LOCKED

(

)

sx_assert(&sysvshmsx, SA_XLOCKED)

Definition at line 209 of file sysv_shm.c.

SYSVSHM_LOCK

#define SYSVSHM_LOCK

(

)

sx_xlock(&sysvshmsx)

Definition at line 207 of file sysv_shm.c.

SYSVSHM_UNLOCK

#define SYSVSHM_UNLOCK

(

)

sx_xunlock(&sysvshmsx)

Definition at line 208 of file sysv_shm.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

DECLARE_MODULE()

DECLARE_MODULE	(	sysvshm	,
		sysvshm_mod	,
		SI_SUB_SYSV_SHM	,
		SI_ORDER_FIRST
	)

FEATURE()

FEATURE	(	sysv_shm	,
		"System V shared memory segments support"
	)

kern_shmat()

int kern_shmat	(	struct thread *	td,
		int	shmid,
		const void *	shmaddr,
		int	shmflg
	)

Definition at line 473 of file sysv_shm.c.

References kern_shmat_locked(), shmmap_state::shmid, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

Referenced by sys_shmat().

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kern_shmat_locked()

static int kern_shmat_locked ( struct thread *  td, int  shmid, const void *  shmaddr, int  shmflg  )

static

Definition at line 383 of file sysv_shm.c.

References ipcperm(), lim_max(), malloc(), shm_find_prison(), shm_find_segment(), shmmap_state::shmid, shminfo, SYSVSHM_ASSERT_LOCKED, time_second, and shmmap_state::va.

Referenced by kern_shmat().

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kern_shmctl()

int kern_shmctl	(	struct thread *	td,
		int	shmid,
		int	cmd,
		void *	buf,
		size_t *	bufsz
	)

Definition at line 602 of file sysv_shm.c.

References buf, kern_shmctl_locked(), SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

Referenced by sys_shmctl().

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kern_shmctl_locked()

static int kern_shmctl_locked ( struct thread *  td, int  shmid, int  cmd, void *  buf, size_t *  bufsz  )

static

Definition at line 498 of file sysv_shm.c.

References buf, ipcperm(), shm_find_prison(), shm_find_segment(), shm_nused, shm_remove(), shmalloced, shminfo, SYSVSHM_ASSERT_LOCKED, and time_second.

Referenced by kern_shmctl().

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kern_shmdt_locked()

static int kern_shmdt_locked ( struct thread *  td, const void *  shmaddr  )

static

Definition at line 333 of file sysv_shm.c.

References shm_delete_mapping(), shm_find_prison(), shmmap_state::shmid, shminfo, shmsegs, SYSVSHM_ASSERT_LOCKED, and shmmap_state::va.

Referenced by sys_shmdt().

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MALLOC_DEFINE()

static MALLOC_DEFINE ( M_SHM  , "shm"  , "SVID compatible shared memory segments"    )

static

MODULE_VERSION()

MODULE_VERSION	(	sysvshm	,
		1
	)

shm_deallocate_segment()

static void shm_deallocate_segment ( struct shmid_kernel *  shmseg )

static

Definition at line 249 of file sysv_shm.c.

References crfree(), shm_committed, shm_nused, SHMSEG_FREE, and SYSVSHM_ASSERT_LOCKED.

Referenced by shm_delete_mapping(), and shm_remove().

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shm_delete_mapping()

static int shm_delete_mapping ( struct vmspace *  vm, struct shmmap_state *  shmmap_s  )

static

Definition at line 271 of file sysv_shm.c.

References result, shm_deallocate_segment(), shm_last_free, shmalloced, shmmap_state::shmid, SHMSEG_REMOVED, shmsegs, SYSVSHM_ASSERT_LOCKED, time_second, and shmmap_state::va.

Referenced by kern_shmdt_locked(), and shmexit_myhook().

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shm_find_prison()

static struct prison * shm_find_prison ( struct ucred *  cred )

static

Definition at line 310 of file sysv_shm.c.

References pr, and shm_prison_slot.

Referenced by kern_shmat_locked(), kern_shmctl_locked(), kern_shmdt_locked(), sys_shmget(), and sysctl_shmsegs().

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shm_find_segment()

static struct shmid_kernel * shm_find_segment ( struct prison *  rpr, int  arg, bool  is_shmid  )

static

Definition at line 230 of file sysv_shm.c.

References shm_allow_removed, shm_prison_cansee(), shmalloced, SHMSEG_ALLOCATED, SHMSEG_REMOVED, and shmsegs.

Referenced by kern_shmat_locked(), and kern_shmctl_locked().

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shm_find_segment_by_key()

static int shm_find_segment_by_key ( struct prison *  pr, key_t  key  )

static

Definition at line 212 of file sysv_shm.c.

References pr, shmalloced, SHMSEG_ALLOCATED, and shmsegs.

Referenced by sys_shmget().

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shm_prison_cansee()

static int shm_prison_cansee ( struct prison *  rpr, struct shmid_kernel *  shmseg  )

static

Definition at line 322 of file sysv_shm.c.

References prison_ischild().

Referenced by shm_find_segment(), and sysctl_shmsegs().

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shm_prison_check()

static int shm_prison_check ( void *  obj, void *  data  )

static

Definition at line 1099 of file sysv_shm.c.

References data, pr, shm_prison_slot, and vfs_copyopt().

Referenced by shminit().

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shm_prison_cleanup()

static void shm_prison_cleanup ( struct prison *  pr )

static

Definition at line 1258 of file sysv_shm.c.

References pr, shm_remove(), shmalloced, SHMSEG_ALLOCATED, and shmsegs.

Referenced by shm_prison_remove(), and shm_prison_set().

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shm_prison_get()

static int shm_prison_get ( void *  obj, void *  data  )

static

Definition at line 1222 of file sysv_shm.c.

References data, pr, shm_prison_slot, and vfs_setopt().

Referenced by shminit().

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shm_prison_remove() [1/2]

static int shm_prison_remove ( void *  , void *    )

static

Referenced by shminit().

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shm_prison_remove() [2/2]

static int shm_prison_remove ( void *  obj, void *data  __unused  )

static

Definition at line 1242 of file sysv_shm.c.

References pr, shm_prison_cleanup(), shm_prison_slot, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

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shm_prison_set()

static int shm_prison_set ( void *  obj, void *  data  )

static

Definition at line 1134 of file sysv_shm.c.

References data, osd_free_reserved(), osd_reserve(), pr, shm_prison_cleanup(), shm_prison_slot, vfs_copyopt(), and vfs_flagopt().

Referenced by shminit().

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shm_remove()

static void shm_remove ( struct shmid_kernel *  shmseg, int  segnum  )

static

Definition at line 298 of file sysv_shm.c.

References shm_deallocate_segment(), shm_last_free, and SHMSEG_REMOVED.

Referenced by kern_shmctl_locked(), and shm_prison_cleanup().

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shmexit_myhook()

static void shmexit_myhook ( struct vmspace *  vm )

static

Definition at line 843 of file sysv_shm.c.

References free(), shm_delete_mapping(), shmmap_state::shmid, shminfo, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

Referenced by shminit().

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shmfork_myhook()

static void shmfork_myhook ( struct proc *  p1, struct proc *  p2  )

static

Definition at line 814 of file sysv_shm.c.

References malloc(), shmalloced, shmmap_state::shmid, shminfo, shmsegs, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

Referenced by shminit().

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shmget_allocate_segment()

static int shmget_allocate_segment ( struct thread *  td, key_t  key, size_t  size, int  mode  )

static

Definition at line 687 of file sysv_shm.c.

References crhold(), mode, shm_committed, shm_last_free, shm_nused, shm_use_phys, shmalloced, shminfo, shmrealloc(), SHMSEG_ALLOCATED, SHMSEG_FREE, shmsegs, SYSVSHM_ASSERT_LOCKED, and time_second.

Referenced by sys_shmget().

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shmget_existing()

static int shmget_existing ( struct thread *  td, size_t  size, int  shmflg, int  mode, int  segnum  )

static

Definition at line 661 of file sysv_shm.c.

References shmalloced, shmsegs, and SYSVSHM_ASSERT_LOCKED.

Referenced by sys_shmget().

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shminit()

static int shminit ( void  )

static

Definition at line 927 of file sysv_shm.c.

References allprison, allprison_lock, malloc(), osd_free_reserved(), osd_reserve(), pr, printf(), prison0, shm_committed, shm_last_free, shm_nused, shm_prison_check(), shm_prison_get(), shm_prison_remove(), shm_prison_set(), shm_prison_slot, shm_syscalls, shmalloced, shmexit_hook, shmexit_myhook(), shmfork_hook, shmfork_myhook(), shminfo, SHMMAX, SHMSEG_FREE, shmsegs, syscall_helper_register(), and sysvshmsx.

Referenced by sysvshm_modload().

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shmrealloc()

static void shmrealloc ( void  )

static

Definition at line 863 of file sysv_shm.c.

References free(), malloc(), shmalloced, shminfo, SHMSEG_FREE, shmsegs, and SYSVSHM_ASSERT_LOCKED.

Referenced by shmget_allocate_segment().

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shmunload()

static int shmunload ( void  )

static

Definition at line 1005 of file sysv_shm.c.

References free(), shm_nused, shm_prison_slot, shm_syscalls, shmalloced, shmexit_hook, shmfork_hook, SHMSEG_FREE, shmsegs, sx_destroy(), syscall_helper_unregister(), and sysvshmsx.

Referenced by sysvshm_modload().

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sys_shmat()

int sys_shmat	(	struct thread *	td,
		struct shmat_args *	uap
	)

Definition at line 491 of file sysv_shm.c.

References kern_shmat(), shmat_args::shmaddr, shmat_args::shmflg, and shmat_args::shmid.

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sys_shmctl()

int sys_shmctl	(	struct thread *	td,
		struct shmctl_args *	uap
	)

Definition at line 620 of file sysv_shm.c.

References shmctl_args::buf, buf, shmctl_args::cmd, kern_shmctl(), and shmctl_args::shmid.

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sys_shmdt()

int sys_shmdt	(	struct thread *	td,
		struct shmdt_args *	uap
	)

Definition at line 372 of file sysv_shm.c.

References kern_shmdt_locked(), shmdt_args::shmaddr, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

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sys_shmget()

int sys_shmget	(	struct thread *	td,
		struct shmget_args *	uap
	)

Definition at line 782 of file sysv_shm.c.

References shmget_args::key, mode, shm_find_prison(), shm_find_segment_by_key(), shmget_args::shmflg, shmget_allocate_segment(), shmget_existing(), shmget_args::size, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

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SYSCTL_INT() [1/2]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		shm_allow_removed	,
		CTLFLAG_RWTUN	,
		&	shm_allow_removed,
		0	,
		"Enable/Disable attachment to attached segments marked for removal"
	)

SYSCTL_INT() [2/2]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		shm_use_phys	,
		CTLFLAG_RWTUN	,
		&	shm_use_phys,
		0	,
		"Enable/Disable locking of shared memory pages in core"
	)

SYSCTL_JAIL_PARAM_SYS_NODE()

SYSCTL_JAIL_PARAM_SYS_NODE	(	sysvshm	,
		CTLFLAG_RW	,
		"SYSV shared memory"
	)

SYSCTL_PROC()

SYSCTL_PROC	(	_kern_ipc	,
		OID_AUTO	,
		shmsegs	,
		CTLTYPE_OPAQUE|CTLFLAG_RD|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		sysctl_shmsegs	,
		""	,
		"Array of struct shmid_kernel for each potential shared memory segment"
	)

sysctl_shmsegs()

static int sysctl_shmsegs ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 1041 of file sysv_shm.c.

References pr, shm_find_prison(), shm_prison_cansee(), shmalloced, SHMSEG_ALLOCATED, SHMSEG_FREE, shmsegs, SYSVSHM_LOCK, and SYSVSHM_UNLOCK.

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SYSCTL_ULONG() [1/5]

SYSCTL_ULONG	(	_kern_ipc	,
		OID_AUTO	,
		shmall	,
		CTLFLAG_RWTUN	,
		&shminfo.	shmall,
		0	,
		"Maximum number of pages available for shared memory"
	)

SYSCTL_ULONG() [2/5]

SYSCTL_ULONG	(	_kern_ipc	,
		OID_AUTO	,
		shmmax	,
		CTLFLAG_RWTUN	,
		&shminfo.	shmmax,
		0	,
		"Maximum shared memory segment size"
	)

SYSCTL_ULONG() [3/5]

SYSCTL_ULONG	(	_kern_ipc	,
		OID_AUTO	,
		shmmin	,
		CTLFLAG_RWTUN	,
		&shminfo.	shmmin,
		0	,
		"Minimum shared memory segment size"
	)

SYSCTL_ULONG() [4/5]

SYSCTL_ULONG	(	_kern_ipc	,
		OID_AUTO	,
		shmmni	,
		CTLFLAG_RDTUN	,
		&shminfo.	shmmni,
		0	,
		"Number of shared memory identifiers"
	)

SYSCTL_ULONG() [5/5]

SYSCTL_ULONG	(	_kern_ipc	,
		OID_AUTO	,
		shmseg	,
		CTLFLAG_RDTUN	,
		&shminfo.	shmseg,
		0	,
		"Number of segments per process"
	)

sysvshm_modload()

static int sysvshm_modload ( struct module *  module, int  cmd, void *  arg  )

static

Definition at line 1674 of file sysv_shm.c.

References shminit(), and shmunload().

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Variable Documentation

shm_allow_removed

int shm_allow_removed = 1

static

Definition at line 185 of file sysv_shm.c.

Referenced by shm_find_segment().

shm_committed

vm_size_t shm_committed

Definition at line 119 of file sysv_shm.c.

Referenced by shm_deallocate_segment(), shmget_allocate_segment(), and shminit().

shm_last_free

int shm_last_free

static

Definition at line 118 of file sysv_shm.c.

Referenced by shm_delete_mapping(), shm_remove(), shmget_allocate_segment(), and shminit().

shm_nused

int shm_nused

static

Definition at line 118 of file sysv_shm.c.

Referenced by kern_shmctl_locked(), shm_deallocate_segment(), shmget_allocate_segment(), shminit(), and shmunload().

shm_prison_slot

unsigned shm_prison_slot

static

Definition at line 121 of file sysv_shm.c.

Referenced by shm_find_prison(), shm_prison_check(), shm_prison_get(), shm_prison_remove(), shm_prison_set(), shminit(), and shmunload().

shm_syscalls

struct syscall_helper_data shm_syscalls[]

static

Initial value:

= {
        SYSCALL_INIT_HELPER(shmat),
        SYSCALL_INIT_HELPER(shmctl),
        SYSCALL_INIT_HELPER(shmdt),
        SYSCALL_INIT_HELPER(shmget),
 
 
 
 
 
 
 
        SYSCALL_INIT_LAST
}

Definition at line 889 of file sysv_shm.c.

Referenced by shminit(), and shmunload().

shm_use_phys

int shm_use_phys

static

Definition at line 184 of file sysv_shm.c.

Referenced by shmget_allocate_segment().

shmalloced

int shmalloced

static

Definition at line 118 of file sysv_shm.c.

Referenced by kern_shmctl_locked(), shm_delete_mapping(), shm_find_segment(), shm_find_segment_by_key(), shm_prison_cleanup(), shmfork_myhook(), shmget_allocate_segment(), shmget_existing(), shminit(), shmrealloc(), shmunload(), and sysctl_shmsegs().

shminfo

struct shminfo shminfo

Initial value:

= {
        .shmmax = SHMMAX,
        .shmmin = SHMMIN,
        .shmmni = SHMMNI,
        .shmseg = SHMSEG,
        .shmall = SHMALL
}

Definition at line 176 of file sysv_shm.c.

Referenced by kern_shmat_locked(), kern_shmctl_locked(), kern_shmdt_locked(), shmexit_myhook(), shmfork_myhook(), shmget_allocate_segment(), shminit(), and shmrealloc().

shmsegs

struct shmid_kernel* shmsegs

static

Definition at line 120 of file sysv_shm.c.

Referenced by kern_shmdt_locked(), shm_delete_mapping(), shm_find_segment(), shm_find_segment_by_key(), shm_prison_cleanup(), shmfork_myhook(), shmget_allocate_segment(), shmget_existing(), shminit(), shmrealloc(), shmunload(), and sysctl_shmsegs().

sysvshm_mod

moduledata_t sysvshm_mod

static

Initial value:

= {
        "sysvshm",
        &sysvshm_modload,
        NULL
}

Definition at line 1696 of file sysv_shm.c.

sysvshmsx

struct sx sysvshmsx

static

Definition at line 206 of file sysv_shm.c.

Referenced by shminit(), and shmunload().