#include <sys/cdefs.h>
#include "opt_posix.h"
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/condvar.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/fnv_hash.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/ksem.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/posix4.h>
#include <sys/_semaphore.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>

Include dependency graph for uipc_sem.c:

Data Structures
struct	ksem_mapping

struct	ksem_init_args

struct	ksem_open_args

struct	ksem_unlink_args

struct	ksem_close_args

struct	ksem_post_args

struct	ksem_wait_args

struct	ksem_timedwait_args

struct	ksem_trywait_args

struct	ksem_getvalue_args

struct	ksem_destroy_args

Macros
#define	SEM_MAX 30

#define	DP(x)

#define	KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])

Functions
	__FBSDID ("$FreeBSD$")

	FEATURE (p1003_1b_semaphores, "POSIX P1003.1B semaphores support")

static	MALLOC_DEFINE (M_KSEM, "ksem", "semaphore file descriptor")

static	LIST_HEAD (ksem_mapping)

	FEATURE (posix_sem, "POSIX semaphores")

static int	ksem_stat (struct file fp, struct stat sb, struct ucred *active_cred)

static int	ksem_chmod (struct file fp, mode_t mode, struct ucred active_cred, struct thread *td)

static int	ksem_chown (struct file fp, uid_t uid, gid_t gid, struct ucred active_cred, struct thread *td)

static int	ksem_closef (struct file fp, struct thread td)

static int	ksem_fill_kinfo (struct file fp, struct kinfo_file kif, struct filedesc *fdp)

static struct ksem *	ksem_alloc (struct ucred *ucred, mode_t mode, unsigned int value)

static struct ksem *	ksem_hold (struct ksem *ks)

static void	ksem_drop (struct ksem *ks)

static int	ksem_access (struct ksem ks, struct ucred ucred)

static struct ksem *	ksem_lookup (char *path, Fnv32_t fnv)

static void	ksem_insert (char path, Fnv32_t fnv, struct ksem ks)

static int	ksem_remove (char path, Fnv32_t fnv, struct ucred ucred)

static int	ksem_create_copyout_semid (struct thread td, semid_t semidp, int fd, int compat32)

static int	ksem_create (struct thread td, const char name, semid_t *semidp, mode_t mode, unsigned int value, int flags, int compat32)

static int	ksem_get (struct thread td, semid_t id, cap_rights_t rightsp, struct file **fpp)

int	sys_ksem_init (struct thread td, struct ksem_init_args uap)

int	sys_ksem_open (struct thread td, struct ksem_open_args uap)

int	sys_ksem_unlink (struct thread td, struct ksem_unlink_args uap)

int	sys_ksem_close (struct thread td, struct ksem_close_args uap)

int	sys_ksem_post (struct thread td, struct ksem_post_args uap)

int	sys_ksem_wait (struct thread td, struct ksem_wait_args uap)

int	sys_ksem_timedwait (struct thread td, struct ksem_timedwait_args uap)

int	sys_ksem_trywait (struct thread td, struct ksem_trywait_args uap)

static int	kern_sem_wait (struct thread td, semid_t id, int tryflag, struct timespec abstime)

int	sys_ksem_getvalue (struct thread td, struct ksem_getvalue_args uap)

int	sys_ksem_destroy (struct thread td, struct ksem_destroy_args uap)

static int	ksem_module_init (void)

static void	ksem_module_destroy (void)

static int	sem_modload (struct module module, int cmd, void arg)

	DECLARE_MODULE (sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST)

	MODULE_VERSION (sem, 1)

Variables
static struct syscall_helper_data	ksem_syscalls []

static moduledata_t	sem_mod

Macro Definition Documentation

◆ DP

#define DP ( x )

Definition at line 94 of file uipc_sem.c.

◆ KSEM_HASH

#define KSEM_HASH ( fnv ) (&ksem_dictionary[(fnv) & ksem_hash])

◆ SEM_MAX

#define SEM_MAX 30

Definition at line 88 of file uipc_sem.c.

Function Documentation

◆ __FBSDID()

__FBSDID ( "$FreeBSD$" )

◆ DECLARE_MODULE()

DECLARE_MODULE	(	sem	,
		sem_mod	,
		SI_SUB_SYSV_SEM	,
		SI_ORDER_FIRST
	)

◆ FEATURE() [1/2]

FEATURE	(	p1003_1b_semaphores	,
		"POSIX P1003.1B semaphores support"
	)

◆ FEATURE() [2/2]

FEATURE	(	posix_sem	,
		"POSIX semaphores"
	)

◆ kern_sem_wait()

static int kern_sem_wait	(	struct thread *	td,
		semid_t	id,
		int	tryflag,
		struct timespec *	abstime
	)

static

Definition at line 807 of file uipc_sem.c.

References DP, getnanotime(), ksem_get(), tvtohz(), and vfs_timestamp().

Referenced by sys_ksem_timedwait(), sys_ksem_trywait(), and sys_ksem_wait().

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◆ ksem_access()

static int ksem_access	(	struct ksem *	ks,
		struct ucred *	ucred
	)

static

Definition at line 359 of file uipc_sem.c.

References priv_check_cred(), and vaccess().

Referenced by ksem_create(), and ksem_remove().

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◆ ksem_alloc()

static struct ksem * ksem_alloc	(	struct ucred *	ucred,
		mode_t	mode,
		unsigned int	value
	)

static

Definition at line 302 of file uipc_sem.c.

References cv_init(), malloc(), mode, p31b_getcfg(), value, and vfs_timestamp().

Referenced by ksem_create().

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◆ ksem_chmod()

static int ksem_chmod	(	struct file *	fp,
		mode_t	mode,
		struct ucred *	active_cred,
		struct thread *	td
	)

static

Definition at line 199 of file uipc_sem.c.

References mode, and vaccess().

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◆ ksem_chown()

static int ksem_chown	(	struct file *	fp,
		uid_t	uid,
		gid_t	gid,
		struct ucred *	active_cred,
		struct thread *	td
	)

static

Definition at line 224 of file uipc_sem.c.

References groupmember(), and priv_check_cred().

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◆ ksem_closef()

static int ksem_closef	(	struct file *	fp,
		struct thread *	td
	)

static

Definition at line 254 of file uipc_sem.c.

References ksem_drop().

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◆ ksem_create()

static int ksem_create	(	struct thread *	td,
		const char *	name,
		semid_t *	semidp,
		mode_t	mode,
		unsigned int	value,
		int	flags,
		int	compat32
	)

static

Definition at line 464 of file uipc_sem.c.

References fd, fdclose(), finit(), flags, free(), ksem_access(), ksem_alloc(), ksem_create_copyout_semid(), ksem_hold(), ksem_insert(), ksem_lookup(), malloc(), mode, name, path, and value.

Referenced by sys_ksem_init(), and sys_ksem_open().

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◆ ksem_create_copyout_semid()

static int ksem_create_copyout_semid	(	struct thread *	td,
		semid_t *	semidp,
		int	fd,
		int	compat32
	)

static

Definition at line 434 of file uipc_sem.c.

References fd.

Referenced by ksem_create().

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◆ ksem_drop()

static void ksem_drop ( struct ksem * ks )

static

Definition at line 339 of file uipc_sem.c.

References cv_destroy(), and free().

Referenced by ksem_closef(), and ksem_remove().

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◆ ksem_fill_kinfo()

static int ksem_fill_kinfo	(	struct file *	fp,
		struct kinfo_file *	kif,
		struct filedesc *	fdp
	)

static

Definition at line 266 of file uipc_sem.c.

References path.

◆ ksem_get()

static int ksem_get	(	struct thread *	td,
		semid_t	id,
		cap_rights_t *	rightsp,
		struct file **	fpp
	)

static

Definition at line 591 of file uipc_sem.c.

References fget().

Referenced by kern_sem_wait(), sys_ksem_close(), sys_ksem_destroy(), sys_ksem_getvalue(), and sys_ksem_post().

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◆ ksem_hold()

static struct ksem * ksem_hold ( struct ksem * ks )

static

Definition at line 331 of file uipc_sem.c.

Referenced by ksem_create(), and ksem_insert().

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◆ ksem_insert()

static void ksem_insert	(	char *	path,
		Fnv32_t	fnv,
		struct ksem *	ks
	)

static

Definition at line 391 of file uipc_sem.c.

References ksem_mapping::km_fnv, ksem_mapping::km_ksem, ksem_mapping::km_path, KSEM_HASH, ksem_hold(), malloc(), and path.

Referenced by ksem_create().

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◆ ksem_lookup()

static struct ksem * ksem_lookup	(	char *	path,
		Fnv32_t	fnv
	)

static

Definition at line 376 of file uipc_sem.c.

References ksem_mapping::km_fnv, ksem_mapping::km_ksem, ksem_mapping::km_path, KSEM_HASH, and path.

Referenced by ksem_create().

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◆ ksem_module_destroy()

static void ksem_module_destroy ( void )

static

Definition at line 1053 of file uipc_sem.c.

References hashdestroy(), ksem_syscalls, p31b_setcfg(), p31b_unsetcfg(), sx_destroy(), and syscall_helper_unregister().

Referenced by sem_modload().

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◆ ksem_module_init()

static int ksem_module_init ( void )

static

Definition at line 1029 of file uipc_sem.c.

References hashinit(), ksem_syscalls, p31b_setcfg(), SEM_MAX, and syscall_helper_register().

Referenced by sem_modload().

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◆ ksem_remove()

static int ksem_remove	(	char *	path,
		Fnv32_t	fnv,
		struct ucred *	ucred
	)

static

Definition at line 404 of file uipc_sem.c.

References free(), ksem_mapping::km_fnv, ksem_mapping::km_ksem, ksem_mapping::km_path, ksem_access(), ksem_drop(), KSEM_HASH, and path.

Referenced by sys_ksem_unlink().

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◆ ksem_stat()

static int ksem_stat	(	struct file *	fp,
		struct stat *	sb,
		struct ucred *	active_cred
	)

static

Definition at line 164 of file uipc_sem.c.

◆ LIST_HEAD()

static LIST_HEAD ( ksem_mapping )

static

Definition at line 105 of file uipc_sem.c.

◆ MALLOC_DEFINE()

static MALLOC_DEFINE	(	M_KSEM	,
		"ksem"	,
		"semaphore file descriptor"
	)

static

◆ MODULE_VERSION()

MODULE_VERSION	(	sem	,
		1
	)

◆ sem_modload()

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

static

Definition at line 1071 of file uipc_sem.c.

References ksem_module_destroy(), and ksem_module_init().

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◆ sys_ksem_close()

int sys_ksem_close	(	struct thread *	td,
		struct ksem_close_args *	uap
	)

Definition at line 691 of file uipc_sem.c.

References cap_no_rights, ksem_close_args::id, kern_close(), and ksem_get().

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◆ sys_ksem_destroy()

int sys_ksem_destroy	(	struct thread *	td,
		struct ksem_destroy_args *	uap
	)

Definition at line 917 of file uipc_sem.c.

References cap_no_rights, ksem_destroy_args::id, kern_close(), and ksem_get().

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◆ sys_ksem_getvalue()

int sys_ksem_getvalue	(	struct thread *	td,
		struct ksem_getvalue_args *	uap
	)

Definition at line 880 of file uipc_sem.c.

References ksem_getvalue_args::id, ksem_get(), ksem_getvalue_args::val, and vfs_timestamp().

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◆ sys_ksem_init()

int sys_ksem_init	(	struct thread *	td,
		struct ksem_init_args *	uap
	)

Definition at line 622 of file uipc_sem.c.

References ksem_init_args::idp, ksem_create(), and ksem_init_args::value.

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◆ sys_ksem_open()

int sys_ksem_open	(	struct thread *	td,
		struct ksem_open_args *	uap
	)

Definition at line 639 of file uipc_sem.c.

References DP, ksem_open_args::idp, ksem_create(), ksem_open_args::mode, ksem_open_args::name, ksem_open_args::oflag, and ksem_open_args::value.

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◆ sys_ksem_post()

int sys_ksem_post	(	struct thread *	td,
		struct ksem_post_args *	uap
	)

Definition at line 718 of file uipc_sem.c.

References cv_signal(), ksem_post_args::id, ksem_get(), and vfs_timestamp().

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◆ sys_ksem_timedwait()

int sys_ksem_timedwait	(	struct thread *	td,
		struct ksem_timedwait_args *	uap
	)

Definition at line 772 of file uipc_sem.c.

References ksem_timedwait_args::abstime, ksem_timedwait_args::id, kern_sem_wait(), and ts.

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◆ sys_ksem_trywait()

int sys_ksem_trywait	(	struct thread *	td,
		struct ksem_trywait_args *	uap
	)

Definition at line 800 of file uipc_sem.c.

References ksem_trywait_args::id, and kern_sem_wait().

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◆ sys_ksem_unlink()

int sys_ksem_unlink	(	struct thread *	td,
		struct ksem_unlink_args *	uap
	)

Definition at line 656 of file uipc_sem.c.

References free(), ksem_remove(), malloc(), ksem_unlink_args::name, and path.

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◆ sys_ksem_wait()

int sys_ksem_wait	(	struct thread *	td,
		struct ksem_wait_args *	uap
	)

Definition at line 759 of file uipc_sem.c.

References ksem_wait_args::id, and kern_sem_wait().

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Variable Documentation

◆ ksem_syscalls

struct syscall_helper_data ksem_syscalls[]

static

Initial value:

= {
        SYSCALL_INIT_HELPER(ksem_init),
        SYSCALL_INIT_HELPER(ksem_open),
        SYSCALL_INIT_HELPER(ksem_unlink),
        SYSCALL_INIT_HELPER(ksem_close),
        SYSCALL_INIT_HELPER(ksem_post),
        SYSCALL_INIT_HELPER(ksem_wait),
        SYSCALL_INIT_HELPER(ksem_timedwait),
        SYSCALL_INIT_HELPER(ksem_trywait),
        SYSCALL_INIT_HELPER(ksem_getvalue),
        SYSCALL_INIT_HELPER(ksem_destroy),
        SYSCALL_INIT_LAST
}

Definition at line 948 of file uipc_sem.c.

Referenced by ksem_module_destroy(), and ksem_module_init().

◆ sem_mod

moduledata_t sem_mod

static

Initial value:

= {
        "sem",
        &sem_modload,
        NULL
}

Definition at line 1103 of file uipc_sem.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ DP

◆ KSEM_HASH

◆ SEM_MAX

Function Documentation

◆ __FBSDID()

◆ DECLARE_MODULE()

◆ FEATURE() [1/2]

◆ FEATURE() [2/2]

◆ kern_sem_wait()

◆ ksem_access()

◆ ksem_alloc()

◆ ksem_chmod()

◆ ksem_chown()

◆ ksem_closef()

◆ ksem_create()

◆ ksem_create_copyout_semid()

◆ ksem_drop()

◆ ksem_fill_kinfo()

◆ ksem_get()

◆ ksem_hold()

◆ ksem_insert()

◆ ksem_lookup()

◆ ksem_module_destroy()

◆ ksem_module_init()

◆ ksem_remove()

◆ ksem_stat()

◆ LIST_HEAD()

◆ MALLOC_DEFINE()

◆ MODULE_VERSION()

◆ sem_modload()

◆ sys_ksem_close()

◆ sys_ksem_destroy()

◆ sys_ksem_getvalue()

◆ sys_ksem_init()

◆ sys_ksem_open()

◆ sys_ksem_post()

◆ sys_ksem_timedwait()

◆ sys_ksem_trywait()

◆ sys_ksem_unlink()

◆ sys_ksem_wait()

Variable Documentation

◆ ksem_syscalls

◆ sem_mod