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_cmp = file_kcmp_generic,
157 .fo_flags = DFLAG_PASSABLE
160 FEATURE(posix_sem, "POSIX semaphores");
163 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
173 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
179 * Attempt to return sanish values for fstat() on a semaphore
182 bzero(sb, sizeof(*sb));
185 sb->st_atim = ks->ks_atime;
186 sb->st_ctim = ks->ks_ctime;
187 sb->st_mtim = ks->ks_mtime;
188 sb->st_birthtim = ks->ks_birthtime;
189 sb->st_uid = ks->ks_uid;
190 sb->st_gid = ks->ks_gid;
191 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
192 mtx_unlock(&sem_lock);
198 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
208 error = mac_posixsem_check_setmode(active_cred, ks, mode);
212 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
216 ks->ks_mode = mode & ACCESSPERMS;
218 mtx_unlock(&sem_lock);
223 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
233 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
237 if (uid == (uid_t)-1)
239 if (gid == (gid_t)-1)
241 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
242 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
243 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN)))
248 mtx_unlock(&sem_lock);
253 ksem_closef(struct file *fp, struct thread *td)
265 ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
267 const char *path, *pr_path;
271 kif->kf_type = KF_TYPE_SEM;
274 kif->kf_un.kf_sem.kf_sem_value = ks->ks_value;
275 kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */
276 mtx_unlock(&sem_lock);
277 if (ks->ks_path != NULL) {
278 sx_slock(&ksem_dict_lock);
279 if (ks->ks_path != NULL) {
281 pr_path = curthread->td_ucred->cr_prison->pr_path;
282 if (strcmp(pr_path, "/") != 0) {
283 /* Return the jail-rooted pathname. */
284 pr_pathlen = strlen(pr_path);
285 if (strncmp(path, pr_path, pr_pathlen) == 0 &&
286 path[pr_pathlen] == '/')
289 strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
291 sx_sunlock(&ksem_dict_lock);
297 * ksem object management including creation and reference counting
301 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
305 mtx_lock(&ksem_count_lock);
306 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
307 mtx_unlock(&ksem_count_lock);
311 mtx_unlock(&ksem_count_lock);
312 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
313 ks->ks_uid = ucred->cr_uid;
314 ks->ks_gid = ucred->cr_gid;
316 ks->ks_value = value;
317 cv_init(&ks->ks_cv, "ksem");
318 vfs_timestamp(&ks->ks_birthtime);
319 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
320 refcount_init(&ks->ks_ref, 1);
322 mac_posixsem_init(ks);
323 mac_posixsem_create(ucred, ks);
330 ksem_hold(struct ksem *ks)
333 refcount_acquire(&ks->ks_ref);
338 ksem_drop(struct ksem *ks)
341 if (refcount_release(&ks->ks_ref)) {
343 mac_posixsem_destroy(ks);
345 cv_destroy(&ks->ks_cv);
347 mtx_lock(&ksem_count_lock);
349 mtx_unlock(&ksem_count_lock);
354 * Determine if the credentials have sufficient permissions for read
358 ksem_access(struct ksem *ks, struct ucred *ucred)
362 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
363 VREAD | VWRITE, ucred);
365 error = priv_check_cred(ucred, PRIV_SEM_WRITE);
370 * Dictionary management. We maintain an in-kernel dictionary to map
371 * paths to semaphore objects. We use the FNV hash on the path to
372 * store the mappings in a hash table.
375 ksem_lookup(char *path, Fnv32_t fnv)
377 struct ksem_mapping *map;
379 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
380 if (map->km_fnv != fnv)
382 if (strcmp(map->km_path, path) == 0)
383 return (map->km_ksem);
390 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
392 struct ksem_mapping *map;
394 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
397 map->km_ksem = ksem_hold(ks);
399 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
403 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
405 struct ksem_mapping *map;
408 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
409 if (map->km_fnv != fnv)
411 if (strcmp(map->km_path, path) == 0) {
413 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
417 error = ksem_access(map->km_ksem, ucred);
420 map->km_ksem->ks_path = NULL;
421 LIST_REMOVE(map, km_link);
422 ksem_drop(map->km_ksem);
423 free(map->km_path, M_KSEM);
433 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
437 #ifdef COMPAT_FREEBSD32
443 #ifdef COMPAT_FREEBSD32
447 ptrs = sizeof(semid32);
452 ptrs = sizeof(semid);
453 compat32 = 0; /* silence gcc */
454 #ifdef COMPAT_FREEBSD32
458 return (copyout(ptr, semidp, ptrs));
461 /* Other helper routines. */
463 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
464 unsigned int value, int flags, int compat32)
475 AUDIT_ARG_FFLAGS(flags);
476 AUDIT_ARG_MODE(mode);
477 AUDIT_ARG_VALUE(value);
479 if (value > SEM_VALUE_MAX)
482 pdp = td->td_proc->p_pd;
483 mode = (mode & ~pdp->pd_cmask) & ACCESSPERMS;
484 error = falloc(td, &fp, &fd, O_CLOEXEC);
492 * Go ahead and copyout the file descriptor now. This is a bit
493 * premature, but it is a lot easier to handle errors as opposed
494 * to later when we've possibly created a new semaphore, etc.
496 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
504 /* Create an anonymous semaphore. */
505 ks = ksem_alloc(td->td_ucred, mode, value);
509 ks->ks_flags |= KS_ANONYMOUS;
511 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
512 pr_path = td->td_ucred->cr_prison->pr_path;
514 /* Construct a full pathname for jailed callers. */
515 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
516 : strlcpy(path, pr_path, MAXPATHLEN);
517 error = copyinstr(name, path + pr_pathlen,
518 MAXPATHLEN - pr_pathlen, NULL);
520 /* Require paths to start with a '/' character. */
521 if (error == 0 && path[pr_pathlen] != '/')
530 AUDIT_ARG_UPATH1_CANON(path);
531 fnv = fnv_32_str(path, FNV1_32_INIT);
532 sx_xlock(&ksem_dict_lock);
533 ks = ksem_lookup(path, fnv);
535 /* Object does not exist, create it if requested. */
536 if (flags & O_CREAT) {
537 ks = ksem_alloc(td->td_ucred, mode, value);
541 ksem_insert(path, fnv, ks);
548 * Object already exists, obtain a new
549 * reference if requested and permitted.
551 if ((flags & (O_CREAT | O_EXCL)) ==
556 error = mac_posixsem_check_open(td->td_ucred,
560 error = ksem_access(ks, td->td_ucred);
569 sx_xunlock(&ksem_dict_lock);
575 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
580 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
582 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
590 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
597 error = fget(td, id, rightsp, &fp);
600 if (fp->f_type != DTYPE_SEM) {
605 if (ks->ks_flags & KS_DEAD) {
614 #ifndef _SYS_SYSPROTO_H_
615 struct ksem_init_args {
621 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
624 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
628 #ifndef _SYS_SYSPROTO_H_
629 struct ksem_open_args {
638 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
641 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
643 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
645 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
649 #ifndef _SYS_SYSPROTO_H_
650 struct ksem_unlink_args {
655 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
663 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
664 pr_path = td->td_ucred->cr_prison->pr_path;
665 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
666 : strlcpy(path, pr_path, MAXPATHLEN);
667 error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
674 AUDIT_ARG_UPATH1_CANON(path);
675 fnv = fnv_32_str(path, FNV1_32_INIT);
676 sx_xlock(&ksem_dict_lock);
677 error = ksem_remove(path, fnv, td->td_ucred);
678 sx_xunlock(&ksem_dict_lock);
684 #ifndef _SYS_SYSPROTO_H_
685 struct ksem_close_args {
690 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
696 /* No capability rights required to close a semaphore. */
697 AUDIT_ARG_FD(uap->id);
698 error = ksem_get(td, uap->id, &cap_no_rights, &fp);
702 if (ks->ks_flags & KS_ANONYMOUS) {
706 error = kern_close(td, uap->id);
711 #ifndef _SYS_SYSPROTO_H_
712 struct ksem_post_args {
717 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
724 AUDIT_ARG_FD(uap->id);
725 error = ksem_get(td, uap->id,
726 cap_rights_init_one(&rights, 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;
816 DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
818 error = ksem_get(td, id, cap_rights_init_one(&rights, CAP_SEM_WAIT),
824 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
825 (int)td->td_proc->p_pid));
827 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
829 DP(("kern_sem_wait mac failed\n"));
833 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
834 vfs_timestamp(&ks->ks_atime);
835 while (ks->ks_value == 0) {
839 else if (abstime == NULL)
840 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
845 timespecsub(&ts1, &ts2, &ts1);
846 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
851 error = cv_timedwait_sig(&ks->ks_cv,
852 &sem_lock, tvtohz(&tv));
853 if (error != EWOULDBLOCK)
862 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
865 mtx_unlock(&sem_lock);
867 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
868 (int)td->td_proc->p_pid, error));
872 #ifndef _SYS_SYSPROTO_H_
873 struct ksem_getvalue_args {
879 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
886 AUDIT_ARG_FD(uap->id);
887 error = ksem_get(td, uap->id,
888 cap_rights_init_one(&rights, CAP_SEM_GETVALUE), &fp);
895 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
897 mtx_unlock(&sem_lock);
903 vfs_timestamp(&ks->ks_atime);
904 mtx_unlock(&sem_lock);
906 error = copyout(&val, uap->val, sizeof(val));
910 #ifndef _SYS_SYSPROTO_H_
911 struct ksem_destroy_args {
916 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
922 /* No capability rights required to close a semaphore. */
923 AUDIT_ARG_FD(uap->id);
924 error = ksem_get(td, uap->id, &cap_no_rights, &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, (semid_t *)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, (semid_t *)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);
1040 error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD);
1043 #ifdef COMPAT_FREEBSD32
1044 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD);
1052 ksem_module_destroy(void)
1055 #ifdef COMPAT_FREEBSD32
1056 syscall32_helper_unregister(ksem32_syscalls);
1058 syscall_helper_unregister(ksem_syscalls);
1060 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1061 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1062 sx_destroy(&ksem_dict_lock);
1063 mtx_destroy(&ksem_count_lock);
1064 mtx_destroy(&sem_lock);
1065 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1066 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1070 sem_modload(struct module *module, int cmd, void *arg)
1076 error = ksem_module_init();
1078 ksem_module_destroy();
1082 mtx_lock(&ksem_count_lock);
1085 mtx_unlock(&ksem_count_lock);
1089 mtx_unlock(&ksem_count_lock);
1090 ksem_module_destroy();
1102 static moduledata_t sem_mod = {
1108 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1109 MODULE_VERSION(sem, 1);