2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
5 * Copyright (c) 2003-2005 SPARTA, Inc.
6 * Copyright (c) 2005, 2016-2017 Robert N. M. Watson
9 * This software was developed for the FreeBSD Project in part by Network
10 * Associates Laboratories, the Security Research Division of Network
11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
12 * as part of the DARPA CHATS research program.
14 * Portions of this software were developed by BAE Systems, the University of
15 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
16 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
17 * Computing (TC) research program.
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <sys/cdefs.h>
42 #include "opt_posix.h"
44 #include <sys/param.h>
45 #include <sys/capsicum.h>
46 #include <sys/condvar.h>
47 #include <sys/fcntl.h>
49 #include <sys/filedesc.h>
50 #include <sys/fnv_hash.h>
52 #include <sys/kernel.h>
55 #include <sys/malloc.h>
56 #include <sys/module.h>
57 #include <sys/mutex.h>
60 #include <sys/posix4.h>
61 #include <sys/_semaphore.h>
63 #include <sys/syscall.h>
64 #include <sys/syscallsubr.h>
65 #include <sys/sysctl.h>
66 #include <sys/sysent.h>
67 #include <sys/sysproto.h>
68 #include <sys/systm.h>
71 #include <sys/vnode.h>
73 #include <security/audit/audit.h>
74 #include <security/mac/mac_framework.h>
76 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
81 * - Replace global sem_lock with mtx_pool locks?
82 * - Add a MAC check_create() hook for creating new named semaphores.
90 #define DP(x) printf x
99 LIST_ENTRY(ksem_mapping) km_link;
102 static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor");
103 static LIST_HEAD(, ksem_mapping) *ksem_dictionary;
104 static struct sx ksem_dict_lock;
105 static struct mtx ksem_count_lock;
106 static struct mtx sem_lock;
107 static u_long ksem_hash;
108 static int ksem_dead;
110 #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])
112 static int nsems = 0;
113 SYSCTL_DECL(_p1003_1b);
114 SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0,
115 "Number of active kernel POSIX semaphores");
117 static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
118 struct timespec *abstime);
119 static int ksem_access(struct ksem *ks, struct ucred *ucred);
120 static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode,
122 static int ksem_create(struct thread *td, const char *path,
123 semid_t *semidp, mode_t mode, unsigned int value,
124 int flags, int compat32);
125 static void ksem_drop(struct ksem *ks);
126 static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
128 static struct ksem *ksem_hold(struct ksem *ks);
129 static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks);
130 static struct ksem *ksem_lookup(char *path, Fnv32_t fnv);
131 static void ksem_module_destroy(void);
132 static int ksem_module_init(void);
133 static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
134 static int sem_modload(struct module *module, int cmd, void *arg);
136 static fo_stat_t ksem_stat;
137 static fo_close_t ksem_closef;
138 static fo_chmod_t ksem_chmod;
139 static fo_chown_t ksem_chown;
140 static fo_fill_kinfo_t ksem_fill_kinfo;
142 /* File descriptor operations. */
143 static struct fileops ksem_ops = {
144 .fo_read = invfo_rdwr,
145 .fo_write = invfo_rdwr,
146 .fo_truncate = invfo_truncate,
147 .fo_ioctl = invfo_ioctl,
148 .fo_poll = invfo_poll,
149 .fo_kqfilter = invfo_kqfilter,
150 .fo_stat = ksem_stat,
151 .fo_close = ksem_closef,
152 .fo_chmod = ksem_chmod,
153 .fo_chown = ksem_chown,
154 .fo_sendfile = invfo_sendfile,
155 .fo_fill_kinfo = ksem_fill_kinfo,
156 .fo_flags = DFLAG_PASSABLE
159 FEATURE(posix_sem, "POSIX semaphores");
162 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
172 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
178 * Attempt to return sanish values for fstat() on a semaphore
181 bzero(sb, sizeof(*sb));
184 sb->st_atim = ks->ks_atime;
185 sb->st_ctim = ks->ks_ctime;
186 sb->st_mtim = ks->ks_mtime;
187 sb->st_birthtim = ks->ks_birthtime;
188 sb->st_uid = ks->ks_uid;
189 sb->st_gid = ks->ks_gid;
190 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
191 mtx_unlock(&sem_lock);
197 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
207 error = mac_posixsem_check_setmode(active_cred, ks, mode);
211 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
215 ks->ks_mode = mode & ACCESSPERMS;
217 mtx_unlock(&sem_lock);
222 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
232 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
236 if (uid == (uid_t)-1)
238 if (gid == (gid_t)-1)
240 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
241 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
242 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN)))
247 mtx_unlock(&sem_lock);
252 ksem_closef(struct file *fp, struct thread *td)
264 ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
266 const char *path, *pr_path;
270 kif->kf_type = KF_TYPE_SEM;
273 kif->kf_un.kf_sem.kf_sem_value = ks->ks_value;
274 kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */
275 mtx_unlock(&sem_lock);
276 if (ks->ks_path != NULL) {
277 sx_slock(&ksem_dict_lock);
278 if (ks->ks_path != NULL) {
280 pr_path = curthread->td_ucred->cr_prison->pr_path;
281 if (strcmp(pr_path, "/") != 0) {
282 /* Return the jail-rooted pathname. */
283 pr_pathlen = strlen(pr_path);
284 if (strncmp(path, pr_path, pr_pathlen) == 0 &&
285 path[pr_pathlen] == '/')
288 strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
290 sx_sunlock(&ksem_dict_lock);
296 * ksem object management including creation and reference counting
300 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
304 mtx_lock(&ksem_count_lock);
305 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
306 mtx_unlock(&ksem_count_lock);
310 mtx_unlock(&ksem_count_lock);
311 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
312 ks->ks_uid = ucred->cr_uid;
313 ks->ks_gid = ucred->cr_gid;
315 ks->ks_value = value;
316 cv_init(&ks->ks_cv, "ksem");
317 vfs_timestamp(&ks->ks_birthtime);
318 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
319 refcount_init(&ks->ks_ref, 1);
321 mac_posixsem_init(ks);
322 mac_posixsem_create(ucred, ks);
329 ksem_hold(struct ksem *ks)
332 refcount_acquire(&ks->ks_ref);
337 ksem_drop(struct ksem *ks)
340 if (refcount_release(&ks->ks_ref)) {
342 mac_posixsem_destroy(ks);
344 cv_destroy(&ks->ks_cv);
346 mtx_lock(&ksem_count_lock);
348 mtx_unlock(&ksem_count_lock);
353 * Determine if the credentials have sufficient permissions for read
357 ksem_access(struct ksem *ks, struct ucred *ucred)
361 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
362 VREAD | VWRITE, ucred);
364 error = priv_check_cred(ucred, PRIV_SEM_WRITE);
369 * Dictionary management. We maintain an in-kernel dictionary to map
370 * paths to semaphore objects. We use the FNV hash on the path to
371 * store the mappings in a hash table.
374 ksem_lookup(char *path, Fnv32_t fnv)
376 struct ksem_mapping *map;
378 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
379 if (map->km_fnv != fnv)
381 if (strcmp(map->km_path, path) == 0)
382 return (map->km_ksem);
389 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
391 struct ksem_mapping *map;
393 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
396 map->km_ksem = ksem_hold(ks);
398 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
402 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
404 struct ksem_mapping *map;
407 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
408 if (map->km_fnv != fnv)
410 if (strcmp(map->km_path, path) == 0) {
412 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
416 error = ksem_access(map->km_ksem, ucred);
419 map->km_ksem->ks_path = NULL;
420 LIST_REMOVE(map, km_link);
421 ksem_drop(map->km_ksem);
422 free(map->km_path, M_KSEM);
432 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
436 #ifdef COMPAT_FREEBSD32
442 #ifdef COMPAT_FREEBSD32
446 ptrs = sizeof(semid32);
451 ptrs = sizeof(semid);
452 compat32 = 0; /* silence gcc */
453 #ifdef COMPAT_FREEBSD32
457 return (copyout(ptr, semidp, ptrs));
460 /* Other helper routines. */
462 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
463 unsigned int value, int flags, int compat32)
474 AUDIT_ARG_FFLAGS(flags);
475 AUDIT_ARG_MODE(mode);
476 AUDIT_ARG_VALUE(value);
478 if (value > SEM_VALUE_MAX)
481 pdp = td->td_proc->p_pd;
482 mode = (mode & ~pdp->pd_cmask) & ACCESSPERMS;
483 error = falloc(td, &fp, &fd, O_CLOEXEC);
491 * Go ahead and copyout the file descriptor now. This is a bit
492 * premature, but it is a lot easier to handle errors as opposed
493 * to later when we've possibly created a new semaphore, etc.
495 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
503 /* Create an anonymous semaphore. */
504 ks = ksem_alloc(td->td_ucred, mode, value);
508 ks->ks_flags |= KS_ANONYMOUS;
510 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
511 pr_path = td->td_ucred->cr_prison->pr_path;
513 /* Construct a full pathname for jailed callers. */
514 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
515 : strlcpy(path, pr_path, MAXPATHLEN);
516 error = copyinstr(name, path + pr_pathlen,
517 MAXPATHLEN - pr_pathlen, NULL);
519 /* Require paths to start with a '/' character. */
520 if (error == 0 && path[pr_pathlen] != '/')
529 AUDIT_ARG_UPATH1_CANON(path);
530 fnv = fnv_32_str(path, FNV1_32_INIT);
531 sx_xlock(&ksem_dict_lock);
532 ks = ksem_lookup(path, fnv);
534 /* Object does not exist, create it if requested. */
535 if (flags & O_CREAT) {
536 ks = ksem_alloc(td->td_ucred, mode, value);
540 ksem_insert(path, fnv, ks);
547 * Object already exists, obtain a new
548 * reference if requested and permitted.
550 if ((flags & (O_CREAT | O_EXCL)) ==
555 error = mac_posixsem_check_open(td->td_ucred,
559 error = ksem_access(ks, td->td_ucred);
568 sx_xunlock(&ksem_dict_lock);
574 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
579 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
581 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
589 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
596 error = fget(td, id, rightsp, &fp);
599 if (fp->f_type != DTYPE_SEM) {
604 if (ks->ks_flags & KS_DEAD) {
613 #ifndef _SYS_SYSPROTO_H_
614 struct ksem_init_args {
620 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
623 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
627 #ifndef _SYS_SYSPROTO_H_
628 struct ksem_open_args {
637 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
640 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
642 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
644 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
648 #ifndef _SYS_SYSPROTO_H_
649 struct ksem_unlink_args {
654 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
662 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
663 pr_path = td->td_ucred->cr_prison->pr_path;
664 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
665 : strlcpy(path, pr_path, MAXPATHLEN);
666 error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
673 AUDIT_ARG_UPATH1_CANON(path);
674 fnv = fnv_32_str(path, FNV1_32_INIT);
675 sx_xlock(&ksem_dict_lock);
676 error = ksem_remove(path, fnv, td->td_ucred);
677 sx_xunlock(&ksem_dict_lock);
683 #ifndef _SYS_SYSPROTO_H_
684 struct ksem_close_args {
689 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
695 /* No capability rights required to close a semaphore. */
696 AUDIT_ARG_FD(uap->id);
697 error = ksem_get(td, uap->id, &cap_no_rights, &fp);
701 if (ks->ks_flags & KS_ANONYMOUS) {
705 error = kern_close(td, uap->id);
710 #ifndef _SYS_SYSPROTO_H_
711 struct ksem_post_args {
716 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
723 AUDIT_ARG_FD(uap->id);
724 error = ksem_get(td, uap->id,
725 cap_rights_init_one(&rights, CAP_SEM_POST), &fp);
732 error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks);
736 if (ks->ks_value == SEM_VALUE_MAX) {
741 if (ks->ks_waiters > 0)
742 cv_signal(&ks->ks_cv);
744 vfs_timestamp(&ks->ks_ctime);
746 mtx_unlock(&sem_lock);
751 #ifndef _SYS_SYSPROTO_H_
752 struct ksem_wait_args {
757 sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap)
760 return (kern_sem_wait(td, uap->id, 0, NULL));
763 #ifndef _SYS_SYSPROTO_H_
764 struct ksem_timedwait_args {
766 const struct timespec *abstime;
770 sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap)
772 struct timespec abstime;
777 * We allow a null timespec (wait forever).
779 if (uap->abstime == NULL)
782 error = copyin(uap->abstime, &abstime, sizeof(abstime));
785 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
789 return (kern_sem_wait(td, uap->id, 0, ts));
792 #ifndef _SYS_SYSPROTO_H_
793 struct ksem_trywait_args {
798 sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap)
801 return (kern_sem_wait(td, uap->id, 1, NULL));
805 kern_sem_wait(struct thread *td, semid_t id, int tryflag,
806 struct timespec *abstime)
808 struct timespec ts1, ts2;
815 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
817 error = ksem_get(td, id, cap_rights_init_one(&rights, CAP_SEM_WAIT),
823 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
824 (int)td->td_proc->p_pid));
826 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
828 DP(("kern_sem_wait mac failed\n"));
832 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
833 vfs_timestamp(&ks->ks_atime);
834 while (ks->ks_value == 0) {
838 else if (abstime == NULL)
839 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
844 timespecsub(&ts1, &ts2, &ts1);
845 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
850 error = cv_timedwait_sig(&ks->ks_cv,
851 &sem_lock, tvtohz(&tv));
852 if (error != EWOULDBLOCK)
861 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
864 mtx_unlock(&sem_lock);
866 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
867 (int)td->td_proc->p_pid, error));
871 #ifndef _SYS_SYSPROTO_H_
872 struct ksem_getvalue_args {
878 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
885 AUDIT_ARG_FD(uap->id);
886 error = ksem_get(td, uap->id,
887 cap_rights_init_one(&rights, CAP_SEM_GETVALUE), &fp);
894 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
896 mtx_unlock(&sem_lock);
902 vfs_timestamp(&ks->ks_atime);
903 mtx_unlock(&sem_lock);
905 error = copyout(&val, uap->val, sizeof(val));
909 #ifndef _SYS_SYSPROTO_H_
910 struct ksem_destroy_args {
915 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
921 /* No capability rights required to close a semaphore. */
922 AUDIT_ARG_FD(uap->id);
923 error = ksem_get(td, uap->id, &cap_no_rights, &fp);
927 if (!(ks->ks_flags & KS_ANONYMOUS)) {
932 if (ks->ks_waiters != 0) {
933 mtx_unlock(&sem_lock);
937 ks->ks_flags |= KS_DEAD;
938 mtx_unlock(&sem_lock);
940 error = kern_close(td, uap->id);
946 static struct syscall_helper_data ksem_syscalls[] = {
947 SYSCALL_INIT_HELPER(ksem_init),
948 SYSCALL_INIT_HELPER(ksem_open),
949 SYSCALL_INIT_HELPER(ksem_unlink),
950 SYSCALL_INIT_HELPER(ksem_close),
951 SYSCALL_INIT_HELPER(ksem_post),
952 SYSCALL_INIT_HELPER(ksem_wait),
953 SYSCALL_INIT_HELPER(ksem_timedwait),
954 SYSCALL_INIT_HELPER(ksem_trywait),
955 SYSCALL_INIT_HELPER(ksem_getvalue),
956 SYSCALL_INIT_HELPER(ksem_destroy),
960 #ifdef COMPAT_FREEBSD32
961 #include <compat/freebsd32/freebsd32.h>
962 #include <compat/freebsd32/freebsd32_proto.h>
963 #include <compat/freebsd32/freebsd32_signal.h>
964 #include <compat/freebsd32/freebsd32_syscall.h>
965 #include <compat/freebsd32/freebsd32_util.h>
968 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
971 return (ksem_create(td, NULL, (semid_t *)uap->idp, S_IRWXU | S_IRWXG, uap->value,
976 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
979 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
981 return (ksem_create(td, uap->name, (semid_t *)uap->idp, uap->mode, uap->value,
986 freebsd32_ksem_timedwait(struct thread *td,
987 struct freebsd32_ksem_timedwait_args *uap)
989 struct timespec32 abstime32;
990 struct timespec *ts, abstime;
994 * We allow a null timespec (wait forever).
996 if (uap->abstime == NULL)
999 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
1002 CP(abstime32, abstime, tv_sec);
1003 CP(abstime32, abstime, tv_nsec);
1004 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
1008 return (kern_sem_wait(td, uap->id, 0, ts));
1011 static struct syscall_helper_data ksem32_syscalls[] = {
1012 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
1013 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
1014 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
1015 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
1016 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
1017 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
1018 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
1019 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
1020 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
1021 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
1027 ksem_module_init(void)
1031 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
1032 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
1033 sx_init(&ksem_dict_lock, "ksem dictionary");
1034 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
1035 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
1036 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
1037 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
1039 error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD);
1042 #ifdef COMPAT_FREEBSD32
1043 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD);
1051 ksem_module_destroy(void)
1054 #ifdef COMPAT_FREEBSD32
1055 syscall32_helper_unregister(ksem32_syscalls);
1057 syscall_helper_unregister(ksem_syscalls);
1059 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1060 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1061 sx_destroy(&ksem_dict_lock);
1062 mtx_destroy(&ksem_count_lock);
1063 mtx_destroy(&sem_lock);
1064 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1065 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1069 sem_modload(struct module *module, int cmd, void *arg)
1075 error = ksem_module_init();
1077 ksem_module_destroy();
1081 mtx_lock(&ksem_count_lock);
1084 mtx_unlock(&ksem_count_lock);
1088 mtx_unlock(&ksem_count_lock);
1089 ksem_module_destroy();
1101 static moduledata_t sem_mod = {
1107 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1108 MODULE_VERSION(sem, 1);