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/capsicum.h>
42 #include <sys/condvar.h>
43 #include <sys/fcntl.h>
45 #include <sys/filedesc.h>
46 #include <sys/fnv_hash.h>
48 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
56 #include <sys/posix4.h>
57 #include <sys/_semaphore.h>
59 #include <sys/syscall.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/sysent.h>
63 #include <sys/sysproto.h>
64 #include <sys/systm.h>
67 #include <sys/vnode.h>
69 #include <security/mac/mac_framework.h>
71 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
76 * - Replace global sem_lock with mtx_pool locks?
77 * - Add a MAC check_create() hook for creating new named semaphores.
85 #define DP(x) printf x
94 LIST_ENTRY(ksem_mapping) km_link;
97 static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor");
98 static LIST_HEAD(, ksem_mapping) *ksem_dictionary;
99 static struct sx ksem_dict_lock;
100 static struct mtx ksem_count_lock;
101 static struct mtx sem_lock;
102 static u_long ksem_hash;
103 static int ksem_dead;
105 #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])
107 static int nsems = 0;
108 SYSCTL_DECL(_p1003_1b);
109 SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0,
110 "Number of active kernel POSIX semaphores");
112 static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
113 struct timespec *abstime);
114 static int ksem_access(struct ksem *ks, struct ucred *ucred);
115 static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode,
117 static int ksem_create(struct thread *td, const char *path,
118 semid_t *semidp, mode_t mode, unsigned int value,
119 int flags, int compat32);
120 static void ksem_drop(struct ksem *ks);
121 static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
123 static struct ksem *ksem_hold(struct ksem *ks);
124 static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks);
125 static struct ksem *ksem_lookup(char *path, Fnv32_t fnv);
126 static void ksem_module_destroy(void);
127 static int ksem_module_init(void);
128 static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
129 static int sem_modload(struct module *module, int cmd, void *arg);
131 static fo_stat_t ksem_stat;
132 static fo_close_t ksem_closef;
133 static fo_chmod_t ksem_chmod;
134 static fo_chown_t ksem_chown;
135 static fo_fill_kinfo_t ksem_fill_kinfo;
137 /* File descriptor operations. */
138 static struct fileops ksem_ops = {
139 .fo_read = invfo_rdwr,
140 .fo_write = invfo_rdwr,
141 .fo_truncate = invfo_truncate,
142 .fo_ioctl = invfo_ioctl,
143 .fo_poll = invfo_poll,
144 .fo_kqfilter = invfo_kqfilter,
145 .fo_stat = ksem_stat,
146 .fo_close = ksem_closef,
147 .fo_chmod = ksem_chmod,
148 .fo_chown = ksem_chown,
149 .fo_sendfile = invfo_sendfile,
150 .fo_fill_kinfo = ksem_fill_kinfo,
151 .fo_flags = DFLAG_PASSABLE
154 FEATURE(posix_sem, "POSIX semaphores");
157 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
168 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
174 * Attempt to return sanish values for fstat() on a semaphore
177 bzero(sb, sizeof(*sb));
180 sb->st_atim = ks->ks_atime;
181 sb->st_ctim = ks->ks_ctime;
182 sb->st_mtim = ks->ks_mtime;
183 sb->st_birthtim = ks->ks_birthtime;
184 sb->st_uid = ks->ks_uid;
185 sb->st_gid = ks->ks_gid;
186 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
187 mtx_unlock(&sem_lock);
193 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
203 error = mac_posixsem_check_setmode(active_cred, ks, mode);
207 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
211 ks->ks_mode = mode & ACCESSPERMS;
213 mtx_unlock(&sem_lock);
218 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
228 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
232 if (uid == (uid_t)-1)
234 if (gid == (gid_t)-1)
236 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
237 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
238 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
243 mtx_unlock(&sem_lock);
248 ksem_closef(struct file *fp, struct thread *td)
260 ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
262 const char *path, *pr_path;
266 kif->kf_type = KF_TYPE_SEM;
269 kif->kf_un.kf_sem.kf_sem_value = ks->ks_value;
270 kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */
271 mtx_unlock(&sem_lock);
272 if (ks->ks_path != NULL) {
273 sx_slock(&ksem_dict_lock);
274 if (ks->ks_path != NULL) {
276 pr_path = curthread->td_ucred->cr_prison->pr_path;
277 if (strcmp(pr_path, "/") != 0) {
278 /* Return the jail-rooted pathname. */
279 pr_pathlen = strlen(pr_path);
280 if (strncmp(path, pr_path, pr_pathlen) == 0 &&
281 path[pr_pathlen] == '/')
284 strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
286 sx_sunlock(&ksem_dict_lock);
292 * ksem object management including creation and reference counting
296 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
300 mtx_lock(&ksem_count_lock);
301 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
302 mtx_unlock(&ksem_count_lock);
306 mtx_unlock(&ksem_count_lock);
307 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
308 ks->ks_uid = ucred->cr_uid;
309 ks->ks_gid = ucred->cr_gid;
311 ks->ks_value = value;
312 cv_init(&ks->ks_cv, "ksem");
313 vfs_timestamp(&ks->ks_birthtime);
314 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
315 refcount_init(&ks->ks_ref, 1);
317 mac_posixsem_init(ks);
318 mac_posixsem_create(ucred, ks);
325 ksem_hold(struct ksem *ks)
328 refcount_acquire(&ks->ks_ref);
333 ksem_drop(struct ksem *ks)
336 if (refcount_release(&ks->ks_ref)) {
338 mac_posixsem_destroy(ks);
340 cv_destroy(&ks->ks_cv);
342 mtx_lock(&ksem_count_lock);
344 mtx_unlock(&ksem_count_lock);
349 * Determine if the credentials have sufficient permissions for read
353 ksem_access(struct ksem *ks, struct ucred *ucred)
357 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
358 VREAD | VWRITE, ucred, NULL);
360 error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0);
365 * Dictionary management. We maintain an in-kernel dictionary to map
366 * paths to semaphore objects. We use the FNV hash on the path to
367 * store the mappings in a hash table.
370 ksem_lookup(char *path, Fnv32_t fnv)
372 struct ksem_mapping *map;
374 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
375 if (map->km_fnv != fnv)
377 if (strcmp(map->km_path, path) == 0)
378 return (map->km_ksem);
385 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
387 struct ksem_mapping *map;
389 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
392 map->km_ksem = ksem_hold(ks);
394 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
398 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
400 struct ksem_mapping *map;
403 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
404 if (map->km_fnv != fnv)
406 if (strcmp(map->km_path, path) == 0) {
408 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
412 error = ksem_access(map->km_ksem, ucred);
415 map->km_ksem->ks_path = NULL;
416 LIST_REMOVE(map, km_link);
417 ksem_drop(map->km_ksem);
418 free(map->km_path, M_KSEM);
428 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
432 #ifdef COMPAT_FREEBSD32
438 #ifdef COMPAT_FREEBSD32
442 ptrs = sizeof(semid32);
447 ptrs = sizeof(semid);
448 compat32 = 0; /* silence gcc */
449 #ifdef COMPAT_FREEBSD32
453 return (copyout(ptr, semidp, ptrs));
456 /* Other helper routines. */
458 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
459 unsigned int value, int flags, int compat32)
461 struct filedesc *fdp;
470 if (value > SEM_VALUE_MAX)
473 fdp = td->td_proc->p_fd;
474 mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS;
475 error = falloc(td, &fp, &fd, O_CLOEXEC);
483 * Go ahead and copyout the file descriptor now. This is a bit
484 * premature, but it is a lot easier to handle errors as opposed
485 * to later when we've possibly created a new semaphore, etc.
487 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
495 /* Create an anonymous semaphore. */
496 ks = ksem_alloc(td->td_ucred, mode, value);
500 ks->ks_flags |= KS_ANONYMOUS;
502 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
503 pr_path = td->td_ucred->cr_prison->pr_path;
505 /* Construct a full pathname for jailed callers. */
506 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
507 : strlcpy(path, pr_path, MAXPATHLEN);
508 error = copyinstr(name, path + pr_pathlen,
509 MAXPATHLEN - pr_pathlen, NULL);
511 /* Require paths to start with a '/' character. */
512 if (error == 0 && path[pr_pathlen] != '/')
521 fnv = fnv_32_str(path, FNV1_32_INIT);
522 sx_xlock(&ksem_dict_lock);
523 ks = ksem_lookup(path, fnv);
525 /* Object does not exist, create it if requested. */
526 if (flags & O_CREAT) {
527 ks = ksem_alloc(td->td_ucred, mode, value);
531 ksem_insert(path, fnv, ks);
538 * Object already exists, obtain a new
539 * reference if requested and permitted.
541 if ((flags & (O_CREAT | O_EXCL)) ==
546 error = mac_posixsem_check_open(td->td_ucred,
550 error = ksem_access(ks, td->td_ucred);
559 sx_xunlock(&ksem_dict_lock);
565 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
570 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
572 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
580 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
587 error = fget(td, id, rightsp, &fp);
590 if (fp->f_type != DTYPE_SEM) {
595 if (ks->ks_flags & KS_DEAD) {
604 #ifndef _SYS_SYSPROTO_H_
605 struct ksem_init_args {
611 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
614 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
618 #ifndef _SYS_SYSPROTO_H_
619 struct ksem_open_args {
628 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
631 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
633 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
635 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
639 #ifndef _SYS_SYSPROTO_H_
640 struct ksem_unlink_args {
645 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
653 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
654 pr_path = td->td_ucred->cr_prison->pr_path;
655 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
656 : strlcpy(path, pr_path, MAXPATHLEN);
657 error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
664 fnv = fnv_32_str(path, FNV1_32_INIT);
665 sx_xlock(&ksem_dict_lock);
666 error = ksem_remove(path, fnv, td->td_ucred);
667 sx_xunlock(&ksem_dict_lock);
673 #ifndef _SYS_SYSPROTO_H_
674 struct ksem_close_args {
679 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
686 /* No capability rights required to close a semaphore. */
687 error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
691 if (ks->ks_flags & KS_ANONYMOUS) {
695 error = kern_close(td, uap->id);
700 #ifndef _SYS_SYSPROTO_H_
701 struct ksem_post_args {
706 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
713 error = ksem_get(td, uap->id,
714 cap_rights_init(&rights, CAP_SEM_POST), &fp);
721 error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks);
725 if (ks->ks_value == SEM_VALUE_MAX) {
730 if (ks->ks_waiters > 0)
731 cv_signal(&ks->ks_cv);
733 vfs_timestamp(&ks->ks_ctime);
735 mtx_unlock(&sem_lock);
740 #ifndef _SYS_SYSPROTO_H_
741 struct ksem_wait_args {
746 sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap)
749 return (kern_sem_wait(td, uap->id, 0, NULL));
752 #ifndef _SYS_SYSPROTO_H_
753 struct ksem_timedwait_args {
755 const struct timespec *abstime;
759 sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap)
761 struct timespec abstime;
766 * We allow a null timespec (wait forever).
768 if (uap->abstime == NULL)
771 error = copyin(uap->abstime, &abstime, sizeof(abstime));
774 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
778 return (kern_sem_wait(td, uap->id, 0, ts));
781 #ifndef _SYS_SYSPROTO_H_
782 struct ksem_trywait_args {
787 sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap)
790 return (kern_sem_wait(td, uap->id, 1, NULL));
794 kern_sem_wait(struct thread *td, semid_t id, int tryflag,
795 struct timespec *abstime)
797 struct timespec ts1, ts2;
804 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
805 error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp);
810 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
811 (int)td->td_proc->p_pid));
813 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
815 DP(("kern_sem_wait mac failed\n"));
819 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
820 vfs_timestamp(&ks->ks_atime);
821 while (ks->ks_value == 0) {
825 else if (abstime == NULL)
826 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
831 timespecsub(&ts1, &ts2);
832 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
837 error = cv_timedwait_sig(&ks->ks_cv,
838 &sem_lock, tvtohz(&tv));
839 if (error != EWOULDBLOCK)
848 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
851 mtx_unlock(&sem_lock);
853 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
854 (int)td->td_proc->p_pid, error));
858 #ifndef _SYS_SYSPROTO_H_
859 struct ksem_getvalue_args {
865 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
872 error = ksem_get(td, uap->id,
873 cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp);
880 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
882 mtx_unlock(&sem_lock);
888 vfs_timestamp(&ks->ks_atime);
889 mtx_unlock(&sem_lock);
891 error = copyout(&val, uap->val, sizeof(val));
895 #ifndef _SYS_SYSPROTO_H_
896 struct ksem_destroy_args {
901 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
908 /* No capability rights required to close a semaphore. */
909 error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
913 if (!(ks->ks_flags & KS_ANONYMOUS)) {
918 if (ks->ks_waiters != 0) {
919 mtx_unlock(&sem_lock);
923 ks->ks_flags |= KS_DEAD;
924 mtx_unlock(&sem_lock);
926 error = kern_close(td, uap->id);
932 static struct syscall_helper_data ksem_syscalls[] = {
933 SYSCALL_INIT_HELPER(ksem_init),
934 SYSCALL_INIT_HELPER(ksem_open),
935 SYSCALL_INIT_HELPER(ksem_unlink),
936 SYSCALL_INIT_HELPER(ksem_close),
937 SYSCALL_INIT_HELPER(ksem_post),
938 SYSCALL_INIT_HELPER(ksem_wait),
939 SYSCALL_INIT_HELPER(ksem_timedwait),
940 SYSCALL_INIT_HELPER(ksem_trywait),
941 SYSCALL_INIT_HELPER(ksem_getvalue),
942 SYSCALL_INIT_HELPER(ksem_destroy),
946 #ifdef COMPAT_FREEBSD32
947 #include <compat/freebsd32/freebsd32.h>
948 #include <compat/freebsd32/freebsd32_proto.h>
949 #include <compat/freebsd32/freebsd32_signal.h>
950 #include <compat/freebsd32/freebsd32_syscall.h>
951 #include <compat/freebsd32/freebsd32_util.h>
954 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
957 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
962 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
965 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
967 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
972 freebsd32_ksem_timedwait(struct thread *td,
973 struct freebsd32_ksem_timedwait_args *uap)
975 struct timespec32 abstime32;
976 struct timespec *ts, abstime;
980 * We allow a null timespec (wait forever).
982 if (uap->abstime == NULL)
985 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
988 CP(abstime32, abstime, tv_sec);
989 CP(abstime32, abstime, tv_nsec);
990 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
994 return (kern_sem_wait(td, uap->id, 0, ts));
997 static struct syscall_helper_data ksem32_syscalls[] = {
998 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
999 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
1000 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
1001 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
1002 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
1003 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
1004 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
1005 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
1006 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
1007 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
1013 ksem_module_init(void)
1017 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
1018 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
1019 sx_init(&ksem_dict_lock, "ksem dictionary");
1020 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
1021 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
1022 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
1023 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
1025 error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD);
1028 #ifdef COMPAT_FREEBSD32
1029 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD);
1037 ksem_module_destroy(void)
1040 #ifdef COMPAT_FREEBSD32
1041 syscall32_helper_unregister(ksem32_syscalls);
1043 syscall_helper_unregister(ksem_syscalls);
1045 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1046 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1047 sx_destroy(&ksem_dict_lock);
1048 mtx_destroy(&ksem_count_lock);
1049 mtx_destroy(&sem_lock);
1050 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1051 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1055 sem_modload(struct module *module, int cmd, void *arg)
1061 error = ksem_module_init();
1063 ksem_module_destroy();
1067 mtx_lock(&ksem_count_lock);
1070 mtx_unlock(&ksem_count_lock);
1074 mtx_unlock(&ksem_count_lock);
1075 ksem_module_destroy();
1087 static moduledata_t sem_mod = {
1093 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1094 MODULE_VERSION(sem, 1);