#include <sys/cdefs.h>
#include "opt_sysvipc.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/abi_compat.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/racct.h>
#include <sys/sem.h>
#include <sys/sx.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/jail.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>

Include dependency graph for sysv_sem.c:

Data Structures
struct	sem_undo

struct	__semctl_args

struct	semget_args

struct	semop_args

Macros
#define	DPRINTF(a)

#define	SEMUNDO_MTX sem_undo_mtx

#define	SEMUNDO_LOCK() mtx_lock(&SEMUNDO_MTX);

#define	SEMUNDO_UNLOCK() mtx_unlock(&SEMUNDO_MTX);

#define	SEMUNDO_LOCKASSERT(how) mtx_assert(&SEMUNDO_MTX, (how));

#define	SEMMNI 50 /* # of semaphore identifiers */

#define	SEMMNS 340 /* # of semaphores in system */

#define	SEMUME 50 /* max # of undo entries per process */

#define	SEMMNU 150 /* # of undo structures in system */

#define	SEMMSL SEMMNS /* max # of semaphores per id */

#define	SEMOPM 100 /* max # of operations per semop call */

#define	SEMVMX 32767 /* semaphore maximum value */

#define	SEMAEM 16384 /* adjust on exit max value */

#define	SEM_ALIGN(bytes) roundup2(bytes, sizeof(long))

#define	SEMUSZ(x) SEM_ALIGN(offsetof(struct sem_undo, un_ent[(x)]))

#define	SEMU(ix) ((struct sem_undo )(((intptr_t)semu) + (ix) seminfo.semusz))

#define	SMALL_SOPS 8

Functions
	__FBSDID ("$FreeBSD$")

	FEATURE (sysv_sem, "System V semaphores support")

static	MALLOC_DEFINE (M_SEM, "sem", "SVID compatible semaphores")

static int	seminit (void)

static int	sysvsem_modload (struct module , int, void )

static int	semunload (void)

static void	semexit_myhook (void arg, struct proc p)

static int	sysctl_sema (SYSCTL_HANDLER_ARGS)

static int	semvalid (int semid, struct prison rpr, struct semid_kernel semakptr)

static void	sem_remove (int semidx, struct ucred *cred)

static struct prison *	sem_find_prison (struct ucred *)

static int	sem_prison_cansee (struct prison , struct semid_kernel )

static int	sem_prison_check (void , void )

static int	sem_prison_set (void , void )

static int	sem_prison_get (void , void )

static int	sem_prison_remove (void , void )

static void	sem_prison_cleanup (struct prison *)

int	__semctl (struct thread td, struct __semctl_args uap)

int	semget (struct thread td, struct semget_args uap)

int	semop (struct thread td, struct semop_args uap)

static struct sem_undo *	semu_alloc (struct thread *td)

static int	semundo_adjust (struct thread td, struct sem_undo *supptr, int semid, int semseq, int semnum, int adjval)

static void	semundo_clear (int semid, int semnum)

	LIST_HEAD (sem_undo)

	SYSCTL_INT (_kern_ipc, OID_AUTO, semmni, CTLFLAG_RDTUN, &seminfo.semmni, 0, "Number of semaphore identifiers")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semmns, CTLFLAG_RDTUN, &seminfo.semmns, 0, "Maximum number of semaphores in the system")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semmnu, CTLFLAG_RDTUN, &seminfo.semmnu, 0, "Maximum number of undo structures in the system")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semmsl, CTLFLAG_RWTUN, &seminfo.semmsl, 0, "Max semaphores per id")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semopm, CTLFLAG_RDTUN, &seminfo.semopm, 0, "Max operations per semop call")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semume, CTLFLAG_RDTUN, &seminfo.semume, 0, "Max undo entries per process")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semusz, CTLFLAG_RD, &seminfo.semusz, 0, "Size in bytes of undo structure")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RWTUN, &seminfo.semvmx, 0, "Semaphore maximum value")

	SYSCTL_INT (_kern_ipc, OID_AUTO, semaem, CTLFLAG_RWTUN, &seminfo.semaem, 0, "Adjust on exit max value")

	SYSCTL_PROC (_kern_ipc, OID_AUTO, sema, CTLTYPE_OPAQUE\|CTLFLAG_RD\|CTLFLAG_MPSAFE, NULL, 0, sysctl_sema, "", "Array of struct semid_kernel for each potential semaphore")

	DECLARE_MODULE (sysvsem, sysvsem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST)

	MODULE_VERSION (sysvsem, 1)

static int	semu_try_free (struct sem_undo *suptr)

int	sys___semctl (struct thread td, struct __semctl_args uap)

int	kern_semctl (struct thread td, int semid, int semnum, int cmd, union semun arg, register_t *rval)

int	sys_semget (struct thread td, struct semget_args uap)

int	sys_semop (struct thread td, struct semop_args uap)

static int	sem_prison_remove (void obj, void data __unused)

	SYSCTL_JAIL_PARAM_SYS_NODE (sysvsem, CTLFLAG_RW, "SYSV semaphores")

Variables
static struct mtx	sem_mtx

static struct mtx	sem_undo_mtx

static int	semtot = 0

static struct semid_kernel *	sema

static struct mtx *	sema_mtx

static struct sem *	sem

struct seminfo	seminfo

static struct syscall_helper_data	sem_syscalls []

static moduledata_t	sysvsem_mod

Macro Definition Documentation

◆ DPRINTF

#define DPRINTF ( a )

Definition at line 83 of file sysv_sem.c.

◆ SEM_ALIGN

#define SEM_ALIGN ( bytes ) roundup2(bytes, sizeof(long))

Definition at line 187 of file sysv_sem.c.

◆ SEMAEM

#define SEMAEM 16384 /* adjust on exit max value */

Definition at line 180 of file sysv_sem.c.

◆ SEMMNI

#define SEMMNI 50 /* # of semaphore identifiers */

Definition at line 159 of file sysv_sem.c.

◆ SEMMNS

#define SEMMNS 340 /* # of semaphores in system */

Definition at line 162 of file sysv_sem.c.

◆ SEMMNU

#define SEMMNU 150 /* # of undo structures in system */

Definition at line 168 of file sysv_sem.c.

◆ SEMMSL

#define SEMMSL SEMMNS /* max # of semaphores per id */

Definition at line 173 of file sysv_sem.c.

◆ SEMOPM

#define SEMOPM 100 /* max # of operations per semop call */

Definition at line 176 of file sysv_sem.c.

◆ SEMU

#define SEMU ( ix ) ((struct sem_undo *)(((intptr_t)semu) + (ix) * seminfo.semusz))

Definition at line 195 of file sysv_sem.c.

◆ SEMUME

#define SEMUME 50 /* max # of undo entries per process */

Definition at line 165 of file sysv_sem.c.

◆ SEMUNDO_LOCK

#define SEMUNDO_LOCK ( ) mtx_lock(&SEMUNDO_MTX);

◆ SEMUNDO_LOCKASSERT

#define SEMUNDO_LOCKASSERT ( how ) mtx_assert(&SEMUNDO_MTX, (how));

◆ SEMUNDO_MTX

#define SEMUNDO_MTX sem_undo_mtx

◆ SEMUNDO_UNLOCK

#define SEMUNDO_UNLOCK ( ) mtx_unlock(&SEMUNDO_MTX);

◆ SEMUSZ

#define SEMUSZ ( x ) SEM_ALIGN(offsetof(struct sem_undo, un_ent[(x)]))

Definition at line 190 of file sysv_sem.c.

◆ SEMVMX

#define SEMVMX 32767 /* semaphore maximum value */

Definition at line 179 of file sysv_sem.c.

◆ SMALL_SOPS

#define SMALL_SOPS 8

Function Documentation

◆ __FBSDID()

__FBSDID ( "$FreeBSD$" )

◆ __semctl()

int __semctl	(	struct thread *	td,
		struct __semctl_args *	uap
	)

◆ DECLARE_MODULE()

DECLARE_MODULE	(	sysvsem	,
		sysvsem_mod	,
		SI_SUB_SYSV_SEM	,
		SI_ORDER_FIRST
	)

◆ FEATURE()

FEATURE	(	sysv_sem	,
		"System V semaphores support"
	)

◆ kern_semctl()

int kern_semctl	(	struct thread *	td,
		int	semid,
		int	semnum,
		int	cmd,
		union semun *	arg,
		register_t *	rval
	)

Definition at line 693 of file sysv_sem.c.

References count, DPRINTF, free(), ipcperm(), malloc(), mtx, sem, sem_find_prison(), sem_mtx, sem_prison_cansee(), sem_remove(), sema, sema_mtx, seminfo, semundo_clear(), SEMUNDO_LOCK, SEMUNDO_UNLOCK, semvalid(), time_second, and wakeup().

Referenced by sys___semctl().

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◆ LIST_HEAD()

LIST_HEAD ( sem_undo )

Definition at line 122 of file sysv_sem.c.

◆ MALLOC_DEFINE()

static MALLOC_DEFINE	(	M_SEM	,
		"sem"	,
		"SVID compatible semaphores"
	)

static

◆ MODULE_VERSION()

MODULE_VERSION	(	sysvsem	,
		1
	)

◆ sem_find_prison()

static struct prison * sem_find_prison ( struct ucred * cred )

static

Definition at line 601 of file sysv_sem.c.

References pr.

Referenced by kern_semctl(), sys_semget(), sys_semop(), and sysctl_sema().

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◆ sem_prison_cansee()

static int sem_prison_cansee	(	struct prison *	rpr,
		struct semid_kernel *	semakptr
	)

static

Definition at line 613 of file sysv_sem.c.

References prison_ischild().

Referenced by kern_semctl(), semvalid(), sys_semop(), and sysctl_sema().

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◆ sem_prison_check()

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

static

Definition at line 1554 of file sysv_sem.c.

References data, pr, and vfs_copyopt().

Referenced by seminit().

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◆ sem_prison_cleanup()

static void sem_prison_cleanup ( struct prison * pr )

static

Definition at line 1710 of file sysv_sem.c.

References pr, sem_mtx, sem_remove(), sema, sema_mtx, and seminfo.

Referenced by sem_prison_remove(), and sem_prison_set().

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◆ sem_prison_get()

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

static

Definition at line 1676 of file sysv_sem.c.

References data, pr, and vfs_setopt().

Referenced by seminit().

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◆ sem_prison_remove() [1/2]

static int sem_prison_remove	(	void *	,
		void *
	)

static

Referenced by seminit().

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◆ sem_prison_remove() [2/2]

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

static

Definition at line 1696 of file sysv_sem.c.

References pr, and sem_prison_cleanup().

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◆ sem_prison_set()

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

static

Definition at line 1589 of file sysv_sem.c.

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

Referenced by seminit().

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◆ sem_remove()

static void sem_remove	(	int	semidx,
		struct ucred *	cred
	)

static

Definition at line 555 of file sysv_sem.c.

References crfree(), sem, sem_mtx, sema, sema_mtx, seminfo, semtot, semundo_clear(), SEMUNDO_LOCK, SEMUNDO_UNLOCK, and wakeup().

Referenced by kern_semctl(), and sem_prison_cleanup().

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◆ semexit_myhook()

static void semexit_myhook	(	void *	arg,
		struct proc *	p
	)

static

Definition at line 1419 of file sysv_sem.c.

References DPRINTF, mtx, panic(), sema, sema_mtx, SEMUNDO_LOCK, SEMUNDO_UNLOCK, sem_undo::un_ent, and wakeup().

Referenced by seminit().

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◆ semget()

int semget	(	struct thread *	td,
		struct semget_args *	uap
	)

◆ seminit()

static int seminit ( void )

static

Definition at line 270 of file sysv_sem.c.

References allprison, allprison_lock, malloc(), mtx, osd_free_reserved(), osd_reserve(), pr, prison0, sem, sem_mtx, sem_prison_check(), sem_prison_get(), sem_prison_remove(), sem_prison_set(), sem_syscalls, sem_undo_mtx, sema, sema_mtx, semexit_myhook(), seminfo, SEMU, SEMUSZ, and syscall_helper_register().

Referenced by sysvsem_modload().

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◆ semop()

int semop	(	struct thread *	td,
		struct semop_args *	uap
	)

◆ semu_alloc()

static struct sem_undo * semu_alloc ( struct thread * td )

static

Definition at line 413 of file sysv_sem.c.

References SEMUNDO_LOCKASSERT.

Referenced by semundo_adjust().

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◆ semu_try_free()

static int semu_try_free ( struct sem_undo * suptr )

static

Definition at line 428 of file sysv_sem.c.

References SEMUNDO_LOCKASSERT.

Referenced by semundo_adjust(), and semundo_clear().

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◆ semundo_adjust()

static int semundo_adjust	(	struct thread *	td,
		struct sem_undo **	supptr,
		int	semid,
		int	semseq,
		int	semnum,
		int	adjval
	)

static

Definition at line 445 of file sysv_sem.c.

References seminfo, semu_alloc(), semu_try_free(), SEMUNDO_LOCKASSERT, and sem_undo::un_ent.

Referenced by sys_semop().

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◆ semundo_clear()

static void semundo_clear	(	int	semid,
		int	semnum
	)

static

Definition at line 518 of file sysv_sem.c.

References semu_try_free(), SEMUNDO_LOCKASSERT, and sem_undo::un_ent.

Referenced by kern_semctl(), and sem_remove().

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◆ semunload()

static int semunload ( void )

static

Definition at line 347 of file sysv_sem.c.

References free(), sem, sem_mtx, sem_syscalls, sem_undo_mtx, sema, sema_mtx, seminfo, semtot, and syscall_helper_unregister().

Referenced by sysvsem_modload().

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◆ semvalid()

static int semvalid	(	int	semid,
		struct prison *	rpr,
		struct semid_kernel *	semakptr
	)

static

Definition at line 546 of file sysv_sem.c.

References sem_prison_cansee().

Referenced by kern_semctl().

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◆ sys___semctl()

int sys___semctl	(	struct thread *	td,
		struct __semctl_args *	uap
	)

Definition at line 635 of file sysv_sem.c.

References __semctl_args::arg, __semctl_args::cmd, kern_semctl(), __semctl_args::semid, and __semctl_args::semnum.

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◆ sys_semget()

int sys_semget	(	struct thread *	td,
		struct semget_args *	uap
	)

Definition at line 967 of file sysv_sem.c.

References crhold(), DPRINTF, ipcperm(), semget_args::key, semget_args::nsems, sem, sem_find_prison(), sem_mtx, sema, sema_mtx, semget_args::semflg, seminfo, semtot, and time_second.

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◆ sys_semop()

int sys_semop	(	struct thread *	td,
		struct semop_args *	uap
	)

Definition at line 1099 of file sysv_sem.c.

References DPRINTF, free(), ipcperm(), malloc(), mtx, semop_args::nsops, panic(), sem, sem_find_prison(), sem_prison_cansee(), sema, sema_mtx, semop_args::semid, seminfo, semundo_adjust(), SEMUNDO_LOCK, SEMUNDO_UNLOCK, SMALL_SOPS, semop_args::sops, time_second, and wakeup().

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◆ SYSCTL_INT() [1/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semaem	,
		CTLFLAG_RWTUN	,
		&seminfo.	semaem,
		0	,
		"Adjust on exit max value"
	)

◆ SYSCTL_INT() [2/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semmni	,
		CTLFLAG_RDTUN	,
		&seminfo.	semmni,
		0	,
		"Number of semaphore identifiers"
	)

◆ SYSCTL_INT() [3/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semmns	,
		CTLFLAG_RDTUN	,
		&seminfo.	semmns,
		0	,
		"Maximum number of semaphores in the system"
	)

◆ SYSCTL_INT() [4/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semmnu	,
		CTLFLAG_RDTUN	,
		&seminfo.	semmnu,
		0	,
		"Maximum number of undo structures in the system"
	)

◆ SYSCTL_INT() [5/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semmsl	,
		CTLFLAG_RWTUN	,
		&seminfo.	semmsl,
		0	,
		"Max semaphores per id"
	)

◆ SYSCTL_INT() [6/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semopm	,
		CTLFLAG_RDTUN	,
		&seminfo.	semopm,
		0	,
		"Max operations per semop call"
	)

◆ SYSCTL_INT() [7/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semume	,
		CTLFLAG_RDTUN	,
		&seminfo.	semume,
		0	,
		"Max undo entries per process"
	)

◆ SYSCTL_INT() [8/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semusz	,
		CTLFLAG_RD	,
		&seminfo.	semusz,
		0	,
		"Size in bytes of undo structure"
	)

◆ SYSCTL_INT() [9/9]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		semvmx	,
		CTLFLAG_RWTUN	,
		&seminfo.	semvmx,
		0	,
		"Semaphore maximum value"
	)

◆ SYSCTL_JAIL_PARAM_SYS_NODE()

SYSCTL_JAIL_PARAM_SYS_NODE	(	sysvsem	,
		CTLFLAG_RW	,
		"SYSV semaphores"
	)

◆ SYSCTL_PROC()

SYSCTL_PROC	(	_kern_ipc	,
		OID_AUTO	,
		sema	,
		CTLTYPE_OPAQUE\|CTLFLAG_RD\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		sysctl_sema	,
		""	,
		"Array of struct semid_kernel for each potential semaphore"
	)

◆ sysctl_sema()

static int sysctl_sema ( SYSCTL_HANDLER_ARGS )

static

Definition at line 1500 of file sysv_sem.c.

References pr, sem_find_prison(), sem_prison_cansee(), sema, sema_mtx, and seminfo.

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◆ sysvsem_modload()

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

static

Definition at line 378 of file sysv_sem.c.

References seminit(), and semunload().

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Variable Documentation

◆ sem

struct sem* sem

static

Definition at line 121 of file sysv_sem.c.

Referenced by do_sem2_wait(), do_sem2_wake(), kern_semctl(), sem_remove(), seminit(), semunload(), sys_semget(), and sys_semop().

◆ sem_mtx

struct mtx sem_mtx

static

Definition at line 116 of file sysv_sem.c.

Referenced by kern_semctl(), sem_prison_cleanup(), sem_remove(), seminit(), semunload(), and sys_semget().

◆ sem_syscalls

struct syscall_helper_data sem_syscalls[]

static

Initial value:

= {
        SYSCALL_INIT_HELPER(__semctl),
        SYSCALL_INIT_HELPER(semget),
        SYSCALL_INIT_HELPER(semop),
 
        SYSCALL_INIT_LAST
}

Definition at line 236 of file sysv_sem.c.

Referenced by seminit(), and semunload().

◆ sem_undo_mtx

struct mtx sem_undo_mtx

static

Definition at line 117 of file sysv_sem.c.

Referenced by seminit(), and semunload().

◆ sema

struct semid_kernel* sema

static

Definition at line 119 of file sysv_sem.c.

Referenced by _sema_post(), _sema_timedwait(), _sema_trywait(), _sema_wait(), kern_semctl(), sem_prison_cleanup(), sem_remove(), sema_destroy(), sema_init(), sema_value(), semexit_myhook(), seminit(), semunload(), sys_semget(), sys_semop(), and sysctl_sema().

◆ sema_mtx

struct mtx* sema_mtx

static

Definition at line 120 of file sysv_sem.c.

Referenced by kern_semctl(), sem_prison_cleanup(), sem_remove(), semexit_myhook(), seminit(), semunload(), sys_semget(), sys_semop(), and sysctl_sema().

◆ seminfo

struct seminfo seminfo

Initial value:

= {
        .semmni =       SEMMNI, 
        .semmns =       SEMMNS, 
        .semmnu =       SEMMNU, 
        .semmsl =       SEMMSL, 
        .semopm =       SEMOPM, 
        .semume =       SEMUME, 
        .semusz =       SEMUSZ(SEMUME), 
        .semvmx =       SEMVMX, 
        .semaem =       SEMAEM, 
}

Definition at line 201 of file sysv_sem.c.

Referenced by kern_semctl(), sem_prison_cleanup(), sem_remove(), seminit(), semundo_adjust(), semunload(), sys_semget(), sys_semop(), and sysctl_sema().

◆ semtot

int semtot = 0

static

Definition at line 118 of file sysv_sem.c.

Referenced by sem_remove(), semunload(), and sys_semget().

◆ sysvsem_mod

moduledata_t sysvsem_mod

static

Initial value:

= {
        "sysvsem",
        &sysvsem_modload,
        NULL
}

Definition at line 398 of file sysv_sem.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ DPRINTF

◆ SEM_ALIGN

◆ SEMAEM

◆ SEMMNI

◆ SEMMNS

◆ SEMMNU

◆ SEMMSL

◆ SEMOPM

◆ SEMU

◆ SEMUME

◆ SEMUNDO_LOCK

◆ SEMUNDO_LOCKASSERT

◆ SEMUNDO_MTX

◆ SEMUNDO_UNLOCK

◆ SEMUSZ

◆ SEMVMX

◆ SMALL_SOPS

Function Documentation

◆ __FBSDID()

◆ __semctl()

◆ DECLARE_MODULE()

◆ FEATURE()

◆ kern_semctl()

◆ LIST_HEAD()

◆ MALLOC_DEFINE()

◆ MODULE_VERSION()

◆ sem_find_prison()

◆ sem_prison_cansee()

◆ sem_prison_check()

◆ sem_prison_cleanup()

◆ sem_prison_get()

◆ sem_prison_remove() [1/2]

◆ sem_prison_remove() [2/2]

◆ sem_prison_set()

◆ sem_remove()

◆ semexit_myhook()

◆ semget()

◆ seminit()

◆ semop()

◆ semu_alloc()

◆ semu_try_free()

◆ semundo_adjust()

◆ semundo_clear()

◆ semunload()

◆ semvalid()

◆ sys___semctl()

◆ sys_semget()

◆ sys_semop()

◆ SYSCTL_INT() [1/9]

◆ SYSCTL_INT() [2/9]

◆ SYSCTL_INT() [3/9]

◆ SYSCTL_INT() [4/9]

◆ SYSCTL_INT() [5/9]

◆ SYSCTL_INT() [6/9]

◆ SYSCTL_INT() [7/9]

◆ SYSCTL_INT() [8/9]

◆ SYSCTL_INT() [9/9]

◆ SYSCTL_JAIL_PARAM_SYS_NODE()

◆ SYSCTL_PROC()

◆ sysctl_sema()

◆ sysvsem_modload()

Variable Documentation

◆ sem

◆ sem_mtx

◆ sem_syscalls

◆ sem_undo_mtx

◆ sema

◆ sema_mtx

◆ seminfo

◆ semtot

◆ sysvsem_mod