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>
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>
66 #include <sys/vnode.h>
68 #include <security/mac/mac_framework.h>
70 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
75 * - Replace global sem_lock with mtx_pool locks?
76 * - Add a MAC check_create() hook for creating new named semaphores.
84 #define DP(x) printf x
93 LIST_ENTRY(ksem_mapping) km_link;
96 static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor");
97 static LIST_HEAD(, ksem_mapping) *ksem_dictionary;
98 static struct sx ksem_dict_lock;
99 static struct mtx ksem_count_lock;
100 static struct mtx sem_lock;
101 static u_long ksem_hash;
102 static int ksem_dead;
104 #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])
106 static int nsems = 0;
107 SYSCTL_DECL(_p1003_1b);
108 SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0,
109 "Number of active kernel POSIX semaphores");
111 static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
112 struct timespec *abstime);
113 static int ksem_access(struct ksem *ks, struct ucred *ucred);
114 static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode,
116 static int ksem_create(struct thread *td, const char *path,
117 semid_t *semidp, mode_t mode, unsigned int value,
118 int flags, int compat32);
119 static void ksem_drop(struct ksem *ks);
120 static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
122 static struct ksem *ksem_hold(struct ksem *ks);
123 static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks);
124 static struct ksem *ksem_lookup(char *path, Fnv32_t fnv);
125 static void ksem_module_destroy(void);
126 static int ksem_module_init(void);
127 static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
128 static int sem_modload(struct module *module, int cmd, void *arg);
130 static fo_stat_t ksem_stat;
131 static fo_close_t ksem_closef;
132 static fo_chmod_t ksem_chmod;
133 static fo_chown_t ksem_chown;
134 static fo_fill_kinfo_t ksem_fill_kinfo;
136 /* File descriptor operations. */
137 static struct fileops ksem_ops = {
138 .fo_read = invfo_rdwr,
139 .fo_write = invfo_rdwr,
140 .fo_truncate = invfo_truncate,
141 .fo_ioctl = invfo_ioctl,
142 .fo_poll = invfo_poll,
143 .fo_kqfilter = invfo_kqfilter,
144 .fo_stat = ksem_stat,
145 .fo_close = ksem_closef,
146 .fo_chmod = ksem_chmod,
147 .fo_chown = ksem_chown,
148 .fo_sendfile = invfo_sendfile,
149 .fo_fill_kinfo = ksem_fill_kinfo,
150 .fo_flags = DFLAG_PASSABLE
153 FEATURE(posix_sem, "POSIX semaphores");
156 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
167 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
173 * Attempt to return sanish values for fstat() on a semaphore
176 bzero(sb, sizeof(*sb));
179 sb->st_atim = ks->ks_atime;
180 sb->st_ctim = ks->ks_ctime;
181 sb->st_mtim = ks->ks_mtime;
182 sb->st_birthtim = ks->ks_birthtime;
183 sb->st_uid = ks->ks_uid;
184 sb->st_gid = ks->ks_gid;
185 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
186 mtx_unlock(&sem_lock);
192 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
202 error = mac_posixsem_check_setmode(active_cred, ks, mode);
206 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
210 ks->ks_mode = mode & ACCESSPERMS;
212 mtx_unlock(&sem_lock);
217 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
227 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
231 if (uid == (uid_t)-1)
233 if (gid == (gid_t)-1)
235 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
236 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
237 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
242 mtx_unlock(&sem_lock);
247 ksem_closef(struct file *fp, struct thread *td)
259 ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
263 kif->kf_type = KF_TYPE_SEM;
266 kif->kf_un.kf_sem.kf_sem_value = ks->ks_value;
267 kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */
268 mtx_unlock(&sem_lock);
269 if (ks->ks_path != NULL) {
270 sx_slock(&ksem_dict_lock);
271 if (ks->ks_path != NULL)
272 strlcpy(kif->kf_path, ks->ks_path, sizeof(kif->kf_path));
273 sx_sunlock(&ksem_dict_lock);
279 * ksem object management including creation and reference counting
283 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
287 mtx_lock(&ksem_count_lock);
288 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
289 mtx_unlock(&ksem_count_lock);
293 mtx_unlock(&ksem_count_lock);
294 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
295 ks->ks_uid = ucred->cr_uid;
296 ks->ks_gid = ucred->cr_gid;
298 ks->ks_value = value;
299 cv_init(&ks->ks_cv, "ksem");
300 vfs_timestamp(&ks->ks_birthtime);
301 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
302 refcount_init(&ks->ks_ref, 1);
304 mac_posixsem_init(ks);
305 mac_posixsem_create(ucred, ks);
312 ksem_hold(struct ksem *ks)
315 refcount_acquire(&ks->ks_ref);
320 ksem_drop(struct ksem *ks)
323 if (refcount_release(&ks->ks_ref)) {
325 mac_posixsem_destroy(ks);
327 cv_destroy(&ks->ks_cv);
329 mtx_lock(&ksem_count_lock);
331 mtx_unlock(&ksem_count_lock);
336 * Determine if the credentials have sufficient permissions for read
340 ksem_access(struct ksem *ks, struct ucred *ucred)
344 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
345 VREAD | VWRITE, ucred, NULL);
347 error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0);
352 * Dictionary management. We maintain an in-kernel dictionary to map
353 * paths to semaphore objects. We use the FNV hash on the path to
354 * store the mappings in a hash table.
357 ksem_lookup(char *path, Fnv32_t fnv)
359 struct ksem_mapping *map;
361 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
362 if (map->km_fnv != fnv)
364 if (strcmp(map->km_path, path) == 0)
365 return (map->km_ksem);
372 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
374 struct ksem_mapping *map;
376 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
379 map->km_ksem = ksem_hold(ks);
381 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
385 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
387 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) {
395 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
399 error = ksem_access(map->km_ksem, ucred);
402 map->km_ksem->ks_path = NULL;
403 LIST_REMOVE(map, km_link);
404 ksem_drop(map->km_ksem);
405 free(map->km_path, M_KSEM);
415 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
419 #ifdef COMPAT_FREEBSD32
425 #ifdef COMPAT_FREEBSD32
429 ptrs = sizeof(semid32);
434 ptrs = sizeof(semid);
435 compat32 = 0; /* silence gcc */
436 #ifdef COMPAT_FREEBSD32
440 return (copyout(ptr, semidp, ptrs));
443 /* Other helper routines. */
445 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
446 unsigned int value, int flags, int compat32)
448 struct filedesc *fdp;
455 if (value > SEM_VALUE_MAX)
458 fdp = td->td_proc->p_fd;
459 mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS;
460 error = falloc(td, &fp, &fd, O_CLOEXEC);
468 * Go ahead and copyout the file descriptor now. This is a bit
469 * premature, but it is a lot easier to handle errors as opposed
470 * to later when we've possibly created a new semaphore, etc.
472 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
480 /* Create an anonymous semaphore. */
481 ks = ksem_alloc(td->td_ucred, mode, value);
485 ks->ks_flags |= KS_ANONYMOUS;
487 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
488 error = copyinstr(name, path, MAXPATHLEN, NULL);
490 /* Require paths to start with a '/' character. */
491 if (error == 0 && path[0] != '/')
500 fnv = fnv_32_str(path, FNV1_32_INIT);
501 sx_xlock(&ksem_dict_lock);
502 ks = ksem_lookup(path, fnv);
504 /* Object does not exist, create it if requested. */
505 if (flags & O_CREAT) {
506 ks = ksem_alloc(td->td_ucred, mode, value);
510 ksem_insert(path, fnv, ks);
517 * Object already exists, obtain a new
518 * reference if requested and permitted.
520 if ((flags & (O_CREAT | O_EXCL)) ==
525 error = mac_posixsem_check_open(td->td_ucred,
529 error = ksem_access(ks, td->td_ucred);
538 sx_xunlock(&ksem_dict_lock);
544 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
549 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
551 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
559 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
566 error = fget(td, id, rightsp, &fp);
569 if (fp->f_type != DTYPE_SEM) {
574 if (ks->ks_flags & KS_DEAD) {
583 #ifndef _SYS_SYSPROTO_H_
584 struct ksem_init_args {
590 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
593 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
597 #ifndef _SYS_SYSPROTO_H_
598 struct ksem_open_args {
607 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
610 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
612 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
614 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
618 #ifndef _SYS_SYSPROTO_H_
619 struct ksem_unlink_args {
624 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
630 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
631 error = copyinstr(uap->name, path, MAXPATHLEN, NULL);
637 fnv = fnv_32_str(path, FNV1_32_INIT);
638 sx_xlock(&ksem_dict_lock);
639 error = ksem_remove(path, fnv, td->td_ucred);
640 sx_xunlock(&ksem_dict_lock);
646 #ifndef _SYS_SYSPROTO_H_
647 struct ksem_close_args {
652 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
658 /* No capability rights required to close a semaphore. */
659 error = ksem_get(td, uap->id, 0, &fp);
663 if (ks->ks_flags & KS_ANONYMOUS) {
667 error = kern_close(td, uap->id);
672 #ifndef _SYS_SYSPROTO_H_
673 struct ksem_post_args {
678 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
685 error = ksem_get(td, uap->id,
686 cap_rights_init(&rights, CAP_SEM_POST), &fp);
693 error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks);
697 if (ks->ks_value == SEM_VALUE_MAX) {
702 if (ks->ks_waiters > 0)
703 cv_signal(&ks->ks_cv);
705 vfs_timestamp(&ks->ks_ctime);
707 mtx_unlock(&sem_lock);
712 #ifndef _SYS_SYSPROTO_H_
713 struct ksem_wait_args {
718 sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap)
721 return (kern_sem_wait(td, uap->id, 0, NULL));
724 #ifndef _SYS_SYSPROTO_H_
725 struct ksem_timedwait_args {
727 const struct timespec *abstime;
731 sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap)
733 struct timespec abstime;
738 * We allow a null timespec (wait forever).
740 if (uap->abstime == NULL)
743 error = copyin(uap->abstime, &abstime, sizeof(abstime));
746 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
750 return (kern_sem_wait(td, uap->id, 0, ts));
753 #ifndef _SYS_SYSPROTO_H_
754 struct ksem_trywait_args {
759 sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap)
762 return (kern_sem_wait(td, uap->id, 1, NULL));
766 kern_sem_wait(struct thread *td, semid_t id, int tryflag,
767 struct timespec *abstime)
769 struct timespec ts1, ts2;
776 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
777 error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp);
782 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
783 (int)td->td_proc->p_pid));
785 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
787 DP(("kern_sem_wait mac failed\n"));
791 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
792 vfs_timestamp(&ks->ks_atime);
793 while (ks->ks_value == 0) {
797 else if (abstime == NULL)
798 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
803 timespecsub(&ts1, &ts2);
804 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
809 error = cv_timedwait_sig(&ks->ks_cv,
810 &sem_lock, tvtohz(&tv));
811 if (error != EWOULDBLOCK)
820 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
823 mtx_unlock(&sem_lock);
825 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
826 (int)td->td_proc->p_pid, error));
830 #ifndef _SYS_SYSPROTO_H_
831 struct ksem_getvalue_args {
837 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
844 error = ksem_get(td, uap->id,
845 cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp);
852 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
854 mtx_unlock(&sem_lock);
860 vfs_timestamp(&ks->ks_atime);
861 mtx_unlock(&sem_lock);
863 error = copyout(&val, uap->val, sizeof(val));
867 #ifndef _SYS_SYSPROTO_H_
868 struct ksem_destroy_args {
873 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
879 /* No capability rights required to close a semaphore. */
880 error = ksem_get(td, uap->id, 0, &fp);
884 if (!(ks->ks_flags & KS_ANONYMOUS)) {
889 if (ks->ks_waiters != 0) {
890 mtx_unlock(&sem_lock);
894 ks->ks_flags |= KS_DEAD;
895 mtx_unlock(&sem_lock);
897 error = kern_close(td, uap->id);
903 static struct syscall_helper_data ksem_syscalls[] = {
904 SYSCALL_INIT_HELPER(ksem_init),
905 SYSCALL_INIT_HELPER(ksem_open),
906 SYSCALL_INIT_HELPER(ksem_unlink),
907 SYSCALL_INIT_HELPER(ksem_close),
908 SYSCALL_INIT_HELPER(ksem_post),
909 SYSCALL_INIT_HELPER(ksem_wait),
910 SYSCALL_INIT_HELPER(ksem_timedwait),
911 SYSCALL_INIT_HELPER(ksem_trywait),
912 SYSCALL_INIT_HELPER(ksem_getvalue),
913 SYSCALL_INIT_HELPER(ksem_destroy),
917 #ifdef COMPAT_FREEBSD32
918 #include <compat/freebsd32/freebsd32.h>
919 #include <compat/freebsd32/freebsd32_proto.h>
920 #include <compat/freebsd32/freebsd32_signal.h>
921 #include <compat/freebsd32/freebsd32_syscall.h>
922 #include <compat/freebsd32/freebsd32_util.h>
925 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
928 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
933 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
936 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
938 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
943 freebsd32_ksem_timedwait(struct thread *td,
944 struct freebsd32_ksem_timedwait_args *uap)
946 struct timespec32 abstime32;
947 struct timespec *ts, abstime;
951 * We allow a null timespec (wait forever).
953 if (uap->abstime == NULL)
956 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
959 CP(abstime32, abstime, tv_sec);
960 CP(abstime32, abstime, tv_nsec);
961 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
965 return (kern_sem_wait(td, uap->id, 0, ts));
968 static struct syscall_helper_data ksem32_syscalls[] = {
969 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
970 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
971 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
972 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
973 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
974 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
975 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
976 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
977 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
978 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
984 ksem_module_init(void)
988 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
989 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
990 sx_init(&ksem_dict_lock, "ksem dictionary");
991 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
992 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
993 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
994 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
996 error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD);
999 #ifdef COMPAT_FREEBSD32
1000 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD);
1008 ksem_module_destroy(void)
1011 #ifdef COMPAT_FREEBSD32
1012 syscall32_helper_unregister(ksem32_syscalls);
1014 syscall_helper_unregister(ksem_syscalls);
1016 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1017 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1018 sx_destroy(&ksem_dict_lock);
1019 mtx_destroy(&ksem_count_lock);
1020 mtx_destroy(&sem_lock);
1021 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1022 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1026 sem_modload(struct module *module, int cmd, void *arg)
1032 error = ksem_module_init();
1034 ksem_module_destroy();
1038 mtx_lock(&ksem_count_lock);
1041 mtx_unlock(&ksem_count_lock);
1045 mtx_unlock(&ksem_count_lock);
1046 ksem_module_destroy();
1058 static moduledata_t sem_mod = {
1064 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1065 MODULE_VERSION(sem, 1);