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 *rightsp,
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_sendfile = invfo_sendfile,
153 .fo_flags = DFLAG_PASSABLE
156 FEATURE(posix_sem, "POSIX semaphores");
159 ksem_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
160 int flags, struct thread *td)
167 ksem_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
168 int flags, struct thread *td)
175 ksem_truncate(struct file *fp, off_t length, struct ucred *active_cred,
183 ksem_ioctl(struct file *fp, u_long com, void *data,
184 struct ucred *active_cred, struct thread *td)
191 ksem_poll(struct file *fp, int events, struct ucred *active_cred,
199 ksem_kqfilter(struct file *fp, struct knote *kn)
206 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
217 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
223 * Attempt to return sanish values for fstat() on a semaphore
226 bzero(sb, sizeof(*sb));
229 sb->st_atim = ks->ks_atime;
230 sb->st_ctim = ks->ks_ctime;
231 sb->st_mtim = ks->ks_mtime;
232 sb->st_birthtim = ks->ks_birthtime;
233 sb->st_uid = ks->ks_uid;
234 sb->st_gid = ks->ks_gid;
235 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
236 mtx_unlock(&sem_lock);
242 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
252 error = mac_posixsem_check_setmode(active_cred, ks, mode);
256 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
260 ks->ks_mode = mode & ACCESSPERMS;
262 mtx_unlock(&sem_lock);
267 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
277 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
281 if (uid == (uid_t)-1)
283 if (gid == (gid_t)-1)
285 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
286 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
287 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
292 mtx_unlock(&sem_lock);
297 ksem_closef(struct file *fp, struct thread *td)
309 * ksem object management including creation and reference counting
313 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
317 mtx_lock(&ksem_count_lock);
318 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
319 mtx_unlock(&ksem_count_lock);
323 mtx_unlock(&ksem_count_lock);
324 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
325 ks->ks_uid = ucred->cr_uid;
326 ks->ks_gid = ucred->cr_gid;
328 ks->ks_value = value;
329 cv_init(&ks->ks_cv, "ksem");
330 vfs_timestamp(&ks->ks_birthtime);
331 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
332 refcount_init(&ks->ks_ref, 1);
334 mac_posixsem_init(ks);
335 mac_posixsem_create(ucred, ks);
342 ksem_hold(struct ksem *ks)
345 refcount_acquire(&ks->ks_ref);
350 ksem_drop(struct ksem *ks)
353 if (refcount_release(&ks->ks_ref)) {
355 mac_posixsem_destroy(ks);
357 cv_destroy(&ks->ks_cv);
359 mtx_lock(&ksem_count_lock);
361 mtx_unlock(&ksem_count_lock);
366 * Determine if the credentials have sufficient permissions for read
370 ksem_access(struct ksem *ks, struct ucred *ucred)
374 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
375 VREAD | VWRITE, ucred, NULL);
377 error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0);
382 * Dictionary management. We maintain an in-kernel dictionary to map
383 * paths to semaphore objects. We use the FNV hash on the path to
384 * store the mappings in a hash table.
387 ksem_lookup(char *path, Fnv32_t fnv)
389 struct ksem_mapping *map;
391 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
392 if (map->km_fnv != fnv)
394 if (strcmp(map->km_path, path) == 0)
395 return (map->km_ksem);
402 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
404 struct ksem_mapping *map;
406 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
409 map->km_ksem = ksem_hold(ks);
411 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
415 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
417 struct ksem_mapping *map;
420 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
421 if (map->km_fnv != fnv)
423 if (strcmp(map->km_path, path) == 0) {
425 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
429 error = ksem_access(map->km_ksem, ucred);
432 map->km_ksem->ks_path = NULL;
433 LIST_REMOVE(map, km_link);
434 ksem_drop(map->km_ksem);
435 free(map->km_path, M_KSEM);
445 ksem_info_impl(struct ksem *ks, char *path, size_t size, uint32_t *value)
448 if (ks->ks_path == NULL)
450 sx_slock(&ksem_dict_lock);
451 if (ks->ks_path != NULL)
452 strlcpy(path, ks->ks_path, size);
454 *value = ks->ks_value;
455 sx_sunlock(&ksem_dict_lock);
459 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
463 #ifdef COMPAT_FREEBSD32
469 #ifdef COMPAT_FREEBSD32
473 ptrs = sizeof(semid32);
478 ptrs = sizeof(semid);
479 compat32 = 0; /* silence gcc */
480 #ifdef COMPAT_FREEBSD32
484 return (copyout(ptr, semidp, ptrs));
487 /* Other helper routines. */
489 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
490 unsigned int value, int flags, int compat32)
492 struct filedesc *fdp;
499 if (value > SEM_VALUE_MAX)
502 fdp = td->td_proc->p_fd;
503 mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS;
504 error = falloc(td, &fp, &fd, O_CLOEXEC);
512 * Go ahead and copyout the file descriptor now. This is a bit
513 * premature, but it is a lot easier to handle errors as opposed
514 * to later when we've possibly created a new semaphore, etc.
516 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
518 fdclose(fdp, fp, fd, td);
524 /* Create an anonymous semaphore. */
525 ks = ksem_alloc(td->td_ucred, mode, value);
529 ks->ks_flags |= KS_ANONYMOUS;
531 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
532 error = copyinstr(name, path, MAXPATHLEN, NULL);
534 /* Require paths to start with a '/' character. */
535 if (error == 0 && path[0] != '/')
538 fdclose(fdp, fp, fd, td);
544 fnv = fnv_32_str(path, FNV1_32_INIT);
545 sx_xlock(&ksem_dict_lock);
546 ks = ksem_lookup(path, fnv);
548 /* Object does not exist, create it if requested. */
549 if (flags & O_CREAT) {
550 ks = ksem_alloc(td->td_ucred, mode, value);
554 ksem_insert(path, fnv, ks);
561 * Object already exists, obtain a new
562 * reference if requested and permitted.
564 if ((flags & (O_CREAT | O_EXCL)) ==
569 error = mac_posixsem_check_open(td->td_ucred,
573 error = ksem_access(ks, td->td_ucred);
582 sx_xunlock(&ksem_dict_lock);
588 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
589 fdclose(fdp, fp, fd, td);
593 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
595 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
603 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
610 error = fget(td, id, rightsp, &fp);
613 if (fp->f_type != DTYPE_SEM) {
618 if (ks->ks_flags & KS_DEAD) {
627 #ifndef _SYS_SYSPROTO_H_
628 struct ksem_init_args {
634 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
637 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
641 #ifndef _SYS_SYSPROTO_H_
642 struct ksem_open_args {
651 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
654 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
656 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
658 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
662 #ifndef _SYS_SYSPROTO_H_
663 struct ksem_unlink_args {
668 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
674 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
675 error = copyinstr(uap->name, path, MAXPATHLEN, NULL);
681 fnv = fnv_32_str(path, FNV1_32_INIT);
682 sx_xlock(&ksem_dict_lock);
683 error = ksem_remove(path, fnv, td->td_ucred);
684 sx_xunlock(&ksem_dict_lock);
690 #ifndef _SYS_SYSPROTO_H_
691 struct ksem_close_args {
696 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
702 /* No capability rights required to close a semaphore. */
703 error = ksem_get(td, uap->id, 0, &fp);
707 if (ks->ks_flags & KS_ANONYMOUS) {
711 error = kern_close(td, uap->id);
716 #ifndef _SYS_SYSPROTO_H_
717 struct ksem_post_args {
722 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
729 error = ksem_get(td, uap->id,
730 cap_rights_init(&rights, CAP_SEM_POST), &fp);
737 error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks);
741 if (ks->ks_value == SEM_VALUE_MAX) {
746 if (ks->ks_waiters > 0)
747 cv_signal(&ks->ks_cv);
749 vfs_timestamp(&ks->ks_ctime);
751 mtx_unlock(&sem_lock);
756 #ifndef _SYS_SYSPROTO_H_
757 struct ksem_wait_args {
762 sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap)
765 return (kern_sem_wait(td, uap->id, 0, NULL));
768 #ifndef _SYS_SYSPROTO_H_
769 struct ksem_timedwait_args {
771 const struct timespec *abstime;
775 sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap)
777 struct timespec abstime;
782 * We allow a null timespec (wait forever).
784 if (uap->abstime == NULL)
787 error = copyin(uap->abstime, &abstime, sizeof(abstime));
790 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
794 return (kern_sem_wait(td, uap->id, 0, ts));
797 #ifndef _SYS_SYSPROTO_H_
798 struct ksem_trywait_args {
803 sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap)
806 return (kern_sem_wait(td, uap->id, 1, NULL));
810 kern_sem_wait(struct thread *td, semid_t id, int tryflag,
811 struct timespec *abstime)
813 struct timespec ts1, ts2;
820 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
821 error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp);
826 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
827 (int)td->td_proc->p_pid));
829 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
831 DP(("kern_sem_wait mac failed\n"));
835 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
836 vfs_timestamp(&ks->ks_atime);
837 while (ks->ks_value == 0) {
841 else if (abstime == NULL)
842 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
847 timespecsub(&ts1, &ts2);
848 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
853 error = cv_timedwait_sig(&ks->ks_cv,
854 &sem_lock, tvtohz(&tv));
855 if (error != EWOULDBLOCK)
864 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
867 mtx_unlock(&sem_lock);
869 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
870 (int)td->td_proc->p_pid, error));
874 #ifndef _SYS_SYSPROTO_H_
875 struct ksem_getvalue_args {
881 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
888 error = ksem_get(td, uap->id,
889 cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp);
896 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
898 mtx_unlock(&sem_lock);
904 vfs_timestamp(&ks->ks_atime);
905 mtx_unlock(&sem_lock);
907 error = copyout(&val, uap->val, sizeof(val));
911 #ifndef _SYS_SYSPROTO_H_
912 struct ksem_destroy_args {
917 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
923 /* No capability rights required to close a semaphore. */
924 error = ksem_get(td, uap->id, 0, &fp);
928 if (!(ks->ks_flags & KS_ANONYMOUS)) {
933 if (ks->ks_waiters != 0) {
934 mtx_unlock(&sem_lock);
938 ks->ks_flags |= KS_DEAD;
939 mtx_unlock(&sem_lock);
941 error = kern_close(td, uap->id);
947 static struct syscall_helper_data ksem_syscalls[] = {
948 SYSCALL_INIT_HELPER(ksem_init),
949 SYSCALL_INIT_HELPER(ksem_open),
950 SYSCALL_INIT_HELPER(ksem_unlink),
951 SYSCALL_INIT_HELPER(ksem_close),
952 SYSCALL_INIT_HELPER(ksem_post),
953 SYSCALL_INIT_HELPER(ksem_wait),
954 SYSCALL_INIT_HELPER(ksem_timedwait),
955 SYSCALL_INIT_HELPER(ksem_trywait),
956 SYSCALL_INIT_HELPER(ksem_getvalue),
957 SYSCALL_INIT_HELPER(ksem_destroy),
961 #ifdef COMPAT_FREEBSD32
962 #include <compat/freebsd32/freebsd32.h>
963 #include <compat/freebsd32/freebsd32_proto.h>
964 #include <compat/freebsd32/freebsd32_signal.h>
965 #include <compat/freebsd32/freebsd32_syscall.h>
966 #include <compat/freebsd32/freebsd32_util.h>
969 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
972 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
977 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
980 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
982 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
987 freebsd32_ksem_timedwait(struct thread *td,
988 struct freebsd32_ksem_timedwait_args *uap)
990 struct timespec32 abstime32;
991 struct timespec *ts, abstime;
995 * We allow a null timespec (wait forever).
997 if (uap->abstime == NULL)
1000 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
1003 CP(abstime32, abstime, tv_sec);
1004 CP(abstime32, abstime, tv_nsec);
1005 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
1009 return (kern_sem_wait(td, uap->id, 0, ts));
1012 static struct syscall_helper_data ksem32_syscalls[] = {
1013 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
1014 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
1015 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
1016 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
1017 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
1018 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
1019 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
1020 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
1021 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
1022 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
1028 ksem_module_init(void)
1032 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
1033 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
1034 sx_init(&ksem_dict_lock, "ksem dictionary");
1035 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
1036 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
1037 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
1038 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
1039 ksem_info = ksem_info_impl;
1041 error = syscall_helper_register(ksem_syscalls);
1044 #ifdef COMPAT_FREEBSD32
1045 error = syscall32_helper_register(ksem32_syscalls);
1053 ksem_module_destroy(void)
1056 #ifdef COMPAT_FREEBSD32
1057 syscall32_helper_unregister(ksem32_syscalls);
1059 syscall_helper_unregister(ksem_syscalls);
1062 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1063 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1064 sx_destroy(&ksem_dict_lock);
1065 mtx_destroy(&ksem_count_lock);
1066 mtx_destroy(&sem_lock);
1067 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1068 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1072 sem_modload(struct module *module, int cmd, void *arg)
1078 error = ksem_module_init();
1080 ksem_module_destroy();
1084 mtx_lock(&ksem_count_lock);
1087 mtx_unlock(&ksem_count_lock);
1091 mtx_unlock(&ksem_count_lock);
1092 ksem_module_destroy();
1104 static moduledata_t sem_mod = {
1110 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1111 MODULE_VERSION(sem, 1);