2 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
3 * Copyright (c) 2003-2005 SPARTA, Inc.
4 * Copyright (c) 2005 Robert N. M. Watson
7 * This software was developed for the FreeBSD Project in part by Network
8 * Associates Laboratories, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
10 * as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_compat.h"
38 #include "opt_posix.h"
40 #include <sys/param.h>
41 #include <sys/capability.h>
42 #include <sys/condvar.h>
43 #include <sys/fcntl.h>
45 #include <sys/filedesc.h>
46 #include <sys/fnv_hash.h>
47 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/module.h>
52 #include <sys/mutex.h>
55 #include <sys/posix4.h>
56 #include <sys/_semaphore.h>
58 #include <sys/syscall.h>
59 #include <sys/syscallsubr.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
62 #include <sys/sysproto.h>
63 #include <sys/systm.h>
65 #include <sys/vnode.h>
67 #include <security/mac/mac_framework.h>
69 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
74 * - Replace global sem_lock with mtx_pool locks?
75 * - Add a MAC check_create() hook for creating new named semaphores.
83 #define DP(x) printf x
92 LIST_ENTRY(ksem_mapping) km_link;
95 static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor");
96 static LIST_HEAD(, ksem_mapping) *ksem_dictionary;
97 static struct sx ksem_dict_lock;
98 static struct mtx ksem_count_lock;
99 static struct mtx sem_lock;
100 static u_long ksem_hash;
101 static int ksem_dead;
103 #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])
105 static int nsems = 0;
106 SYSCTL_DECL(_p1003_1b);
107 SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0,
108 "Number of active kernel POSIX semaphores");
110 static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
111 struct timespec *abstime);
112 static int ksem_access(struct ksem *ks, struct ucred *ucred);
113 static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode,
115 static int ksem_create(struct thread *td, const char *path,
116 semid_t *semidp, mode_t mode, unsigned int value,
117 int flags, int compat32);
118 static void ksem_drop(struct ksem *ks);
119 static int ksem_get(struct thread *td, semid_t id, cap_rights_t rights,
121 static struct ksem *ksem_hold(struct ksem *ks);
122 static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks);
123 static struct ksem *ksem_lookup(char *path, Fnv32_t fnv);
124 static void ksem_module_destroy(void);
125 static int ksem_module_init(void);
126 static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
127 static int sem_modload(struct module *module, int cmd, void *arg);
129 static fo_rdwr_t ksem_read;
130 static fo_rdwr_t ksem_write;
131 static fo_truncate_t ksem_truncate;
132 static fo_ioctl_t ksem_ioctl;
133 static fo_poll_t ksem_poll;
134 static fo_kqfilter_t ksem_kqfilter;
135 static fo_stat_t ksem_stat;
136 static fo_close_t ksem_closef;
137 static fo_chmod_t ksem_chmod;
138 static fo_chown_t ksem_chown;
140 /* File descriptor operations. */
141 static struct fileops ksem_ops = {
142 .fo_read = ksem_read,
143 .fo_write = ksem_write,
144 .fo_truncate = ksem_truncate,
145 .fo_ioctl = ksem_ioctl,
146 .fo_poll = ksem_poll,
147 .fo_kqfilter = ksem_kqfilter,
148 .fo_stat = ksem_stat,
149 .fo_close = ksem_closef,
150 .fo_chmod = ksem_chmod,
151 .fo_chown = ksem_chown,
152 .fo_flags = DFLAG_PASSABLE
155 FEATURE(posix_sem, "POSIX semaphores");
158 ksem_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
159 int flags, struct thread *td)
166 ksem_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
167 int flags, struct thread *td)
174 ksem_truncate(struct file *fp, off_t length, struct ucred *active_cred,
182 ksem_ioctl(struct file *fp, u_long com, void *data,
183 struct ucred *active_cred, struct thread *td)
190 ksem_poll(struct file *fp, int events, struct ucred *active_cred,
198 ksem_kqfilter(struct file *fp, struct knote *kn)
205 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
216 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
222 * Attempt to return sanish values for fstat() on a semaphore
225 bzero(sb, sizeof(*sb));
228 sb->st_atim = ks->ks_atime;
229 sb->st_ctim = ks->ks_ctime;
230 sb->st_mtim = ks->ks_mtime;
231 sb->st_birthtim = ks->ks_birthtime;
232 sb->st_uid = ks->ks_uid;
233 sb->st_gid = ks->ks_gid;
234 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
235 mtx_unlock(&sem_lock);
241 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
251 error = mac_posixsem_check_setmode(active_cred, ks, mode);
255 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
259 ks->ks_mode = mode & ACCESSPERMS;
261 mtx_unlock(&sem_lock);
266 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
276 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
280 if (uid == (uid_t)-1)
282 if (gid == (gid_t)-1)
284 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
285 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
286 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
291 mtx_unlock(&sem_lock);
296 ksem_closef(struct file *fp, struct thread *td)
308 * ksem object management including creation and reference counting
312 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
316 mtx_lock(&ksem_count_lock);
317 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
318 mtx_unlock(&ksem_count_lock);
322 mtx_unlock(&ksem_count_lock);
323 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
324 ks->ks_uid = ucred->cr_uid;
325 ks->ks_gid = ucred->cr_gid;
327 ks->ks_value = value;
328 cv_init(&ks->ks_cv, "ksem");
329 vfs_timestamp(&ks->ks_birthtime);
330 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
331 refcount_init(&ks->ks_ref, 1);
333 mac_posixsem_init(ks);
334 mac_posixsem_create(ucred, ks);
341 ksem_hold(struct ksem *ks)
344 refcount_acquire(&ks->ks_ref);
349 ksem_drop(struct ksem *ks)
352 if (refcount_release(&ks->ks_ref)) {
354 mac_posixsem_destroy(ks);
356 cv_destroy(&ks->ks_cv);
358 mtx_lock(&ksem_count_lock);
360 mtx_unlock(&ksem_count_lock);
365 * Determine if the credentials have sufficient permissions for read
369 ksem_access(struct ksem *ks, struct ucred *ucred)
373 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
374 VREAD | VWRITE, ucred, NULL);
376 error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0);
381 * Dictionary management. We maintain an in-kernel dictionary to map
382 * paths to semaphore objects. We use the FNV hash on the path to
383 * store the mappings in a hash table.
386 ksem_lookup(char *path, Fnv32_t fnv)
388 struct ksem_mapping *map;
390 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
391 if (map->km_fnv != fnv)
393 if (strcmp(map->km_path, path) == 0)
394 return (map->km_ksem);
401 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
403 struct ksem_mapping *map;
405 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
408 map->km_ksem = ksem_hold(ks);
410 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
414 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
416 struct ksem_mapping *map;
419 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
420 if (map->km_fnv != fnv)
422 if (strcmp(map->km_path, path) == 0) {
424 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
428 error = ksem_access(map->km_ksem, ucred);
431 map->km_ksem->ks_path = NULL;
432 LIST_REMOVE(map, km_link);
433 ksem_drop(map->km_ksem);
434 free(map->km_path, M_KSEM);
444 ksem_info_impl(struct ksem *ks, char *path, size_t size, uint32_t *value)
447 if (ks->ks_path == NULL)
449 sx_slock(&ksem_dict_lock);
450 if (ks->ks_path != NULL)
451 strlcpy(path, ks->ks_path, size);
453 *value = ks->ks_value;
454 sx_sunlock(&ksem_dict_lock);
458 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
462 #ifdef COMPAT_FREEBSD32
468 #ifdef COMPAT_FREEBSD32
472 ptrs = sizeof(semid32);
477 ptrs = sizeof(semid);
478 compat32 = 0; /* silence gcc */
479 #ifdef COMPAT_FREEBSD32
483 return (copyout(ptr, semidp, ptrs));
486 /* Other helper routines. */
488 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
489 unsigned int value, int flags, int compat32)
491 struct filedesc *fdp;
498 if (value > SEM_VALUE_MAX)
501 fdp = td->td_proc->p_fd;
502 mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS;
503 error = falloc(td, &fp, &fd, O_CLOEXEC);
511 * Go ahead and copyout the file descriptor now. This is a bit
512 * premature, but it is a lot easier to handle errors as opposed
513 * to later when we've possibly created a new semaphore, etc.
515 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
517 fdclose(fdp, fp, fd, td);
523 /* Create an anonymous semaphore. */
524 ks = ksem_alloc(td->td_ucred, mode, value);
528 ks->ks_flags |= KS_ANONYMOUS;
530 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
531 error = copyinstr(name, path, MAXPATHLEN, NULL);
533 /* Require paths to start with a '/' character. */
534 if (error == 0 && path[0] != '/')
537 fdclose(fdp, fp, fd, td);
543 fnv = fnv_32_str(path, FNV1_32_INIT);
544 sx_xlock(&ksem_dict_lock);
545 ks = ksem_lookup(path, fnv);
547 /* Object does not exist, create it if requested. */
548 if (flags & O_CREAT) {
549 ks = ksem_alloc(td->td_ucred, mode, value);
553 ksem_insert(path, fnv, ks);
560 * Object already exists, obtain a new
561 * reference if requested and permitted.
563 if ((flags & (O_CREAT | O_EXCL)) ==
568 error = mac_posixsem_check_open(td->td_ucred,
572 error = ksem_access(ks, td->td_ucred);
581 sx_xunlock(&ksem_dict_lock);
587 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
588 fdclose(fdp, fp, fd, td);
592 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
594 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
602 ksem_get(struct thread *td, semid_t id, cap_rights_t rights, struct file **fpp)
608 error = fget(td, id, rights, &fp);
611 if (fp->f_type != DTYPE_SEM) {
616 if (ks->ks_flags & KS_DEAD) {
625 #ifndef _SYS_SYSPROTO_H_
626 struct ksem_init_args {
632 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
635 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
639 #ifndef _SYS_SYSPROTO_H_
640 struct ksem_open_args {
649 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
652 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
654 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
656 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
660 #ifndef _SYS_SYSPROTO_H_
661 struct ksem_unlink_args {
666 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
672 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
673 error = copyinstr(uap->name, path, MAXPATHLEN, NULL);
679 fnv = fnv_32_str(path, FNV1_32_INIT);
680 sx_xlock(&ksem_dict_lock);
681 error = ksem_remove(path, fnv, td->td_ucred);
682 sx_xunlock(&ksem_dict_lock);
688 #ifndef _SYS_SYSPROTO_H_
689 struct ksem_close_args {
694 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
700 /* No capability rights required to close a semaphore. */
701 error = ksem_get(td, uap->id, 0, &fp);
705 if (ks->ks_flags & KS_ANONYMOUS) {
709 error = kern_close(td, uap->id);
714 #ifndef _SYS_SYSPROTO_H_
715 struct ksem_post_args {
720 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
726 error = ksem_get(td, uap->id, CAP_SEM_POST, &fp);
733 error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks);
737 if (ks->ks_value == SEM_VALUE_MAX) {
742 if (ks->ks_waiters > 0)
743 cv_signal(&ks->ks_cv);
745 vfs_timestamp(&ks->ks_ctime);
747 mtx_unlock(&sem_lock);
752 #ifndef _SYS_SYSPROTO_H_
753 struct ksem_wait_args {
758 sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap)
761 return (kern_sem_wait(td, uap->id, 0, NULL));
764 #ifndef _SYS_SYSPROTO_H_
765 struct ksem_timedwait_args {
767 const struct timespec *abstime;
771 sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap)
773 struct timespec abstime;
778 * We allow a null timespec (wait forever).
780 if (uap->abstime == NULL)
783 error = copyin(uap->abstime, &abstime, sizeof(abstime));
786 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
790 return (kern_sem_wait(td, uap->id, 0, ts));
793 #ifndef _SYS_SYSPROTO_H_
794 struct ksem_trywait_args {
799 sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap)
802 return (kern_sem_wait(td, uap->id, 1, NULL));
806 kern_sem_wait(struct thread *td, semid_t id, int tryflag,
807 struct timespec *abstime)
809 struct timespec ts1, ts2;
815 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
816 error = ksem_get(td, id, CAP_SEM_WAIT, &fp);
821 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
822 (int)td->td_proc->p_pid));
824 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
826 DP(("kern_sem_wait mac failed\n"));
830 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
831 vfs_timestamp(&ks->ks_atime);
832 while (ks->ks_value == 0) {
836 else if (abstime == NULL)
837 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
842 timespecsub(&ts1, &ts2);
843 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
848 error = cv_timedwait_sig(&ks->ks_cv,
849 &sem_lock, tvtohz(&tv));
850 if (error != EWOULDBLOCK)
859 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
862 mtx_unlock(&sem_lock);
864 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
865 (int)td->td_proc->p_pid, error));
869 #ifndef _SYS_SYSPROTO_H_
870 struct ksem_getvalue_args {
876 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
882 error = ksem_get(td, uap->id, CAP_SEM_GETVALUE, &fp);
889 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
891 mtx_unlock(&sem_lock);
897 vfs_timestamp(&ks->ks_atime);
898 mtx_unlock(&sem_lock);
900 error = copyout(&val, uap->val, sizeof(val));
904 #ifndef _SYS_SYSPROTO_H_
905 struct ksem_destroy_args {
910 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
916 /* No capability rights required to close a semaphore. */
917 error = ksem_get(td, uap->id, 0, &fp);
921 if (!(ks->ks_flags & KS_ANONYMOUS)) {
926 if (ks->ks_waiters != 0) {
927 mtx_unlock(&sem_lock);
931 ks->ks_flags |= KS_DEAD;
932 mtx_unlock(&sem_lock);
934 error = kern_close(td, uap->id);
940 static struct syscall_helper_data ksem_syscalls[] = {
941 SYSCALL_INIT_HELPER(ksem_init),
942 SYSCALL_INIT_HELPER(ksem_open),
943 SYSCALL_INIT_HELPER(ksem_unlink),
944 SYSCALL_INIT_HELPER(ksem_close),
945 SYSCALL_INIT_HELPER(ksem_post),
946 SYSCALL_INIT_HELPER(ksem_wait),
947 SYSCALL_INIT_HELPER(ksem_timedwait),
948 SYSCALL_INIT_HELPER(ksem_trywait),
949 SYSCALL_INIT_HELPER(ksem_getvalue),
950 SYSCALL_INIT_HELPER(ksem_destroy),
954 #ifdef COMPAT_FREEBSD32
955 #include <compat/freebsd32/freebsd32.h>
956 #include <compat/freebsd32/freebsd32_proto.h>
957 #include <compat/freebsd32/freebsd32_signal.h>
958 #include <compat/freebsd32/freebsd32_syscall.h>
959 #include <compat/freebsd32/freebsd32_util.h>
962 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
965 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
970 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
973 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
975 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
980 freebsd32_ksem_timedwait(struct thread *td,
981 struct freebsd32_ksem_timedwait_args *uap)
983 struct timespec32 abstime32;
984 struct timespec *ts, abstime;
988 * We allow a null timespec (wait forever).
990 if (uap->abstime == NULL)
993 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
996 CP(abstime32, abstime, tv_sec);
997 CP(abstime32, abstime, tv_nsec);
998 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
1002 return (kern_sem_wait(td, uap->id, 0, ts));
1005 static struct syscall_helper_data ksem32_syscalls[] = {
1006 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
1007 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
1008 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
1009 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
1010 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
1011 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
1012 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
1013 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
1014 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
1015 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
1021 ksem_module_init(void)
1025 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
1026 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
1027 sx_init(&ksem_dict_lock, "ksem dictionary");
1028 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
1029 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
1030 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
1031 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
1032 ksem_info = ksem_info_impl;
1034 error = syscall_helper_register(ksem_syscalls);
1037 #ifdef COMPAT_FREEBSD32
1038 error = syscall32_helper_register(ksem32_syscalls);
1046 ksem_module_destroy(void)
1049 #ifdef COMPAT_FREEBSD32
1050 syscall32_helper_unregister(ksem32_syscalls);
1052 syscall_helper_unregister(ksem_syscalls);
1055 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1056 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1057 sx_destroy(&ksem_dict_lock);
1058 mtx_destroy(&ksem_count_lock);
1059 mtx_destroy(&sem_lock);
1060 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1061 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1065 sem_modload(struct module *module, int cmd, void *arg)
1071 error = ksem_module_init();
1073 ksem_module_destroy();
1077 mtx_lock(&ksem_count_lock);
1080 mtx_unlock(&ksem_count_lock);
1084 mtx_unlock(&ksem_count_lock);
1085 ksem_module_destroy();
1097 static moduledata_t sem_mod = {
1103 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1104 MODULE_VERSION(sem, 1);