2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
44 #include "opt_compat.h"
45 #include "opt_posix.h"
47 #include <sys/param.h>
48 #include <sys/capsicum.h>
49 #include <sys/condvar.h>
50 #include <sys/fcntl.h>
52 #include <sys/filedesc.h>
53 #include <sys/fnv_hash.h>
55 #include <sys/kernel.h>
58 #include <sys/malloc.h>
59 #include <sys/module.h>
60 #include <sys/mutex.h>
63 #include <sys/posix4.h>
64 #include <sys/_semaphore.h>
66 #include <sys/syscall.h>
67 #include <sys/syscallsubr.h>
68 #include <sys/sysctl.h>
69 #include <sys/sysent.h>
70 #include <sys/sysproto.h>
71 #include <sys/systm.h>
74 #include <sys/vnode.h>
76 #include <security/audit/audit.h>
77 #include <security/mac/mac_framework.h>
79 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
84 * - Replace global sem_lock with mtx_pool locks?
85 * - Add a MAC check_create() hook for creating new named semaphores.
93 #define DP(x) printf x
101 struct ksem *km_ksem;
102 LIST_ENTRY(ksem_mapping) km_link;
105 static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor");
106 static LIST_HEAD(, ksem_mapping) *ksem_dictionary;
107 static struct sx ksem_dict_lock;
108 static struct mtx ksem_count_lock;
109 static struct mtx sem_lock;
110 static u_long ksem_hash;
111 static int ksem_dead;
113 #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash])
115 static int nsems = 0;
116 SYSCTL_DECL(_p1003_1b);
117 SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0,
118 "Number of active kernel POSIX semaphores");
120 static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
121 struct timespec *abstime);
122 static int ksem_access(struct ksem *ks, struct ucred *ucred);
123 static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode,
125 static int ksem_create(struct thread *td, const char *path,
126 semid_t *semidp, mode_t mode, unsigned int value,
127 int flags, int compat32);
128 static void ksem_drop(struct ksem *ks);
129 static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
131 static struct ksem *ksem_hold(struct ksem *ks);
132 static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks);
133 static struct ksem *ksem_lookup(char *path, Fnv32_t fnv);
134 static void ksem_module_destroy(void);
135 static int ksem_module_init(void);
136 static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
137 static int sem_modload(struct module *module, int cmd, void *arg);
139 static fo_stat_t ksem_stat;
140 static fo_close_t ksem_closef;
141 static fo_chmod_t ksem_chmod;
142 static fo_chown_t ksem_chown;
143 static fo_fill_kinfo_t ksem_fill_kinfo;
145 /* File descriptor operations. */
146 static struct fileops ksem_ops = {
147 .fo_read = invfo_rdwr,
148 .fo_write = invfo_rdwr,
149 .fo_truncate = invfo_truncate,
150 .fo_ioctl = invfo_ioctl,
151 .fo_poll = invfo_poll,
152 .fo_kqfilter = invfo_kqfilter,
153 .fo_stat = ksem_stat,
154 .fo_close = ksem_closef,
155 .fo_chmod = ksem_chmod,
156 .fo_chown = ksem_chown,
157 .fo_sendfile = invfo_sendfile,
158 .fo_fill_kinfo = ksem_fill_kinfo,
159 .fo_flags = DFLAG_PASSABLE
162 FEATURE(posix_sem, "POSIX semaphores");
165 ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
176 error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks);
182 * Attempt to return sanish values for fstat() on a semaphore
185 bzero(sb, sizeof(*sb));
188 sb->st_atim = ks->ks_atime;
189 sb->st_ctim = ks->ks_ctime;
190 sb->st_mtim = ks->ks_mtime;
191 sb->st_birthtim = ks->ks_birthtime;
192 sb->st_uid = ks->ks_uid;
193 sb->st_gid = ks->ks_gid;
194 sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */
195 mtx_unlock(&sem_lock);
201 ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
211 error = mac_posixsem_check_setmode(active_cred, ks, mode);
215 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN,
219 ks->ks_mode = mode & ACCESSPERMS;
221 mtx_unlock(&sem_lock);
226 ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
236 error = mac_posixsem_check_setowner(active_cred, ks, uid, gid);
240 if (uid == (uid_t)-1)
242 if (gid == (gid_t)-1)
244 if (((uid != ks->ks_uid && uid != active_cred->cr_uid) ||
245 (gid != ks->ks_gid && !groupmember(gid, active_cred))) &&
246 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
251 mtx_unlock(&sem_lock);
256 ksem_closef(struct file *fp, struct thread *td)
268 ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
270 const char *path, *pr_path;
274 kif->kf_type = KF_TYPE_SEM;
277 kif->kf_un.kf_sem.kf_sem_value = ks->ks_value;
278 kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */
279 mtx_unlock(&sem_lock);
280 if (ks->ks_path != NULL) {
281 sx_slock(&ksem_dict_lock);
282 if (ks->ks_path != NULL) {
284 pr_path = curthread->td_ucred->cr_prison->pr_path;
285 if (strcmp(pr_path, "/") != 0) {
286 /* Return the jail-rooted pathname. */
287 pr_pathlen = strlen(pr_path);
288 if (strncmp(path, pr_path, pr_pathlen) == 0 &&
289 path[pr_pathlen] == '/')
292 strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
294 sx_sunlock(&ksem_dict_lock);
300 * ksem object management including creation and reference counting
304 ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
308 mtx_lock(&ksem_count_lock);
309 if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
310 mtx_unlock(&ksem_count_lock);
314 mtx_unlock(&ksem_count_lock);
315 ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
316 ks->ks_uid = ucred->cr_uid;
317 ks->ks_gid = ucred->cr_gid;
319 ks->ks_value = value;
320 cv_init(&ks->ks_cv, "ksem");
321 vfs_timestamp(&ks->ks_birthtime);
322 ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
323 refcount_init(&ks->ks_ref, 1);
325 mac_posixsem_init(ks);
326 mac_posixsem_create(ucred, ks);
333 ksem_hold(struct ksem *ks)
336 refcount_acquire(&ks->ks_ref);
341 ksem_drop(struct ksem *ks)
344 if (refcount_release(&ks->ks_ref)) {
346 mac_posixsem_destroy(ks);
348 cv_destroy(&ks->ks_cv);
350 mtx_lock(&ksem_count_lock);
352 mtx_unlock(&ksem_count_lock);
357 * Determine if the credentials have sufficient permissions for read
361 ksem_access(struct ksem *ks, struct ucred *ucred)
365 error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid,
366 VREAD | VWRITE, ucred, NULL);
368 error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0);
373 * Dictionary management. We maintain an in-kernel dictionary to map
374 * paths to semaphore objects. We use the FNV hash on the path to
375 * store the mappings in a hash table.
378 ksem_lookup(char *path, Fnv32_t fnv)
380 struct ksem_mapping *map;
382 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
383 if (map->km_fnv != fnv)
385 if (strcmp(map->km_path, path) == 0)
386 return (map->km_ksem);
393 ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks)
395 struct ksem_mapping *map;
397 map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK);
400 map->km_ksem = ksem_hold(ks);
402 LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link);
406 ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred)
408 struct ksem_mapping *map;
411 LIST_FOREACH(map, KSEM_HASH(fnv), km_link) {
412 if (map->km_fnv != fnv)
414 if (strcmp(map->km_path, path) == 0) {
416 error = mac_posixsem_check_unlink(ucred, map->km_ksem);
420 error = ksem_access(map->km_ksem, ucred);
423 map->km_ksem->ks_path = NULL;
424 LIST_REMOVE(map, km_link);
425 ksem_drop(map->km_ksem);
426 free(map->km_path, M_KSEM);
436 ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd,
440 #ifdef COMPAT_FREEBSD32
446 #ifdef COMPAT_FREEBSD32
450 ptrs = sizeof(semid32);
455 ptrs = sizeof(semid);
456 compat32 = 0; /* silence gcc */
457 #ifdef COMPAT_FREEBSD32
461 return (copyout(ptr, semidp, ptrs));
464 /* Other helper routines. */
466 ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
467 unsigned int value, int flags, int compat32)
469 struct filedesc *fdp;
478 AUDIT_ARG_FFLAGS(flags);
479 AUDIT_ARG_MODE(mode);
480 AUDIT_ARG_VALUE(value);
482 if (value > SEM_VALUE_MAX)
485 fdp = td->td_proc->p_fd;
486 mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS;
487 error = falloc(td, &fp, &fd, O_CLOEXEC);
495 * Go ahead and copyout the file descriptor now. This is a bit
496 * premature, but it is a lot easier to handle errors as opposed
497 * to later when we've possibly created a new semaphore, etc.
499 error = ksem_create_copyout_semid(td, semidp, fd, compat32);
507 /* Create an anonymous semaphore. */
508 ks = ksem_alloc(td->td_ucred, mode, value);
512 ks->ks_flags |= KS_ANONYMOUS;
514 path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
515 pr_path = td->td_ucred->cr_prison->pr_path;
517 /* Construct a full pathname for jailed callers. */
518 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
519 : strlcpy(path, pr_path, MAXPATHLEN);
520 error = copyinstr(name, path + pr_pathlen,
521 MAXPATHLEN - pr_pathlen, NULL);
523 /* Require paths to start with a '/' character. */
524 if (error == 0 && path[pr_pathlen] != '/')
533 AUDIT_ARG_UPATH1_CANON(path);
534 fnv = fnv_32_str(path, FNV1_32_INIT);
535 sx_xlock(&ksem_dict_lock);
536 ks = ksem_lookup(path, fnv);
538 /* Object does not exist, create it if requested. */
539 if (flags & O_CREAT) {
540 ks = ksem_alloc(td->td_ucred, mode, value);
544 ksem_insert(path, fnv, ks);
551 * Object already exists, obtain a new
552 * reference if requested and permitted.
554 if ((flags & (O_CREAT | O_EXCL)) ==
559 error = mac_posixsem_check_open(td->td_ucred,
563 error = ksem_access(ks, td->td_ucred);
572 sx_xunlock(&ksem_dict_lock);
578 KASSERT(ks == NULL, ("ksem_create error with a ksem"));
583 KASSERT(ks != NULL, ("ksem_create w/o a ksem"));
585 finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops);
593 ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp,
600 error = fget(td, id, rightsp, &fp);
603 if (fp->f_type != DTYPE_SEM) {
608 if (ks->ks_flags & KS_DEAD) {
617 #ifndef _SYS_SYSPROTO_H_
618 struct ksem_init_args {
624 sys_ksem_init(struct thread *td, struct ksem_init_args *uap)
627 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
631 #ifndef _SYS_SYSPROTO_H_
632 struct ksem_open_args {
641 sys_ksem_open(struct thread *td, struct ksem_open_args *uap)
644 DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid));
646 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
648 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
652 #ifndef _SYS_SYSPROTO_H_
653 struct ksem_unlink_args {
658 sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
666 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
667 pr_path = td->td_ucred->cr_prison->pr_path;
668 pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
669 : strlcpy(path, pr_path, MAXPATHLEN);
670 error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
677 AUDIT_ARG_UPATH1_CANON(path);
678 fnv = fnv_32_str(path, FNV1_32_INIT);
679 sx_xlock(&ksem_dict_lock);
680 error = ksem_remove(path, fnv, td->td_ucred);
681 sx_xunlock(&ksem_dict_lock);
687 #ifndef _SYS_SYSPROTO_H_
688 struct ksem_close_args {
693 sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
700 /* No capability rights required to close a semaphore. */
701 AUDIT_ARG_FD(uap->id);
702 error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
706 if (ks->ks_flags & KS_ANONYMOUS) {
710 error = kern_close(td, uap->id);
715 #ifndef _SYS_SYSPROTO_H_
716 struct ksem_post_args {
721 sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
728 AUDIT_ARG_FD(uap->id);
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));
822 error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp);
827 DP((">>> kern_sem_wait critical section entered! pid=%d\n",
828 (int)td->td_proc->p_pid));
830 error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks);
832 DP(("kern_sem_wait mac failed\n"));
836 DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag));
837 vfs_timestamp(&ks->ks_atime);
838 while (ks->ks_value == 0) {
842 else if (abstime == NULL)
843 error = cv_wait_sig(&ks->ks_cv, &sem_lock);
848 timespecsub(&ts1, &ts2);
849 TIMESPEC_TO_TIMEVAL(&tv, &ts1);
854 error = cv_timedwait_sig(&ks->ks_cv,
855 &sem_lock, tvtohz(&tv));
856 if (error != EWOULDBLOCK)
865 DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value));
868 mtx_unlock(&sem_lock);
870 DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n",
871 (int)td->td_proc->p_pid, error));
875 #ifndef _SYS_SYSPROTO_H_
876 struct ksem_getvalue_args {
882 sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
889 AUDIT_ARG_FD(uap->id);
890 error = ksem_get(td, uap->id,
891 cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp);
898 error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks);
900 mtx_unlock(&sem_lock);
906 vfs_timestamp(&ks->ks_atime);
907 mtx_unlock(&sem_lock);
909 error = copyout(&val, uap->val, sizeof(val));
913 #ifndef _SYS_SYSPROTO_H_
914 struct ksem_destroy_args {
919 sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
926 /* No capability rights required to close a semaphore. */
927 AUDIT_ARG_FD(uap->id);
928 error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
932 if (!(ks->ks_flags & KS_ANONYMOUS)) {
937 if (ks->ks_waiters != 0) {
938 mtx_unlock(&sem_lock);
942 ks->ks_flags |= KS_DEAD;
943 mtx_unlock(&sem_lock);
945 error = kern_close(td, uap->id);
951 static struct syscall_helper_data ksem_syscalls[] = {
952 SYSCALL_INIT_HELPER(ksem_init),
953 SYSCALL_INIT_HELPER(ksem_open),
954 SYSCALL_INIT_HELPER(ksem_unlink),
955 SYSCALL_INIT_HELPER(ksem_close),
956 SYSCALL_INIT_HELPER(ksem_post),
957 SYSCALL_INIT_HELPER(ksem_wait),
958 SYSCALL_INIT_HELPER(ksem_timedwait),
959 SYSCALL_INIT_HELPER(ksem_trywait),
960 SYSCALL_INIT_HELPER(ksem_getvalue),
961 SYSCALL_INIT_HELPER(ksem_destroy),
965 #ifdef COMPAT_FREEBSD32
966 #include <compat/freebsd32/freebsd32.h>
967 #include <compat/freebsd32/freebsd32_proto.h>
968 #include <compat/freebsd32/freebsd32_signal.h>
969 #include <compat/freebsd32/freebsd32_syscall.h>
970 #include <compat/freebsd32/freebsd32_util.h>
973 freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap)
976 return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value,
981 freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap)
984 if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0)
986 return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value,
991 freebsd32_ksem_timedwait(struct thread *td,
992 struct freebsd32_ksem_timedwait_args *uap)
994 struct timespec32 abstime32;
995 struct timespec *ts, abstime;
999 * We allow a null timespec (wait forever).
1001 if (uap->abstime == NULL)
1004 error = copyin(uap->abstime, &abstime32, sizeof(abstime32));
1007 CP(abstime32, abstime, tv_sec);
1008 CP(abstime32, abstime, tv_nsec);
1009 if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0)
1013 return (kern_sem_wait(td, uap->id, 0, ts));
1016 static struct syscall_helper_data ksem32_syscalls[] = {
1017 SYSCALL32_INIT_HELPER(freebsd32_ksem_init),
1018 SYSCALL32_INIT_HELPER(freebsd32_ksem_open),
1019 SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink),
1020 SYSCALL32_INIT_HELPER_COMPAT(ksem_close),
1021 SYSCALL32_INIT_HELPER_COMPAT(ksem_post),
1022 SYSCALL32_INIT_HELPER_COMPAT(ksem_wait),
1023 SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait),
1024 SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait),
1025 SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue),
1026 SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy),
1032 ksem_module_init(void)
1036 mtx_init(&sem_lock, "sem", NULL, MTX_DEF);
1037 mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF);
1038 sx_init(&ksem_dict_lock, "ksem dictionary");
1039 ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash);
1040 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L);
1041 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX);
1042 p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX);
1044 error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD);
1047 #ifdef COMPAT_FREEBSD32
1048 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD);
1056 ksem_module_destroy(void)
1059 #ifdef COMPAT_FREEBSD32
1060 syscall32_helper_unregister(ksem32_syscalls);
1062 syscall_helper_unregister(ksem_syscalls);
1064 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0);
1065 hashdestroy(ksem_dictionary, M_KSEM, ksem_hash);
1066 sx_destroy(&ksem_dict_lock);
1067 mtx_destroy(&ksem_count_lock);
1068 mtx_destroy(&sem_lock);
1069 p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
1070 p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
1074 sem_modload(struct module *module, int cmd, void *arg)
1080 error = ksem_module_init();
1082 ksem_module_destroy();
1086 mtx_lock(&ksem_count_lock);
1089 mtx_unlock(&ksem_count_lock);
1093 mtx_unlock(&ksem_count_lock);
1094 ksem_module_destroy();
1106 static moduledata_t sem_mod = {
1112 DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST);
1113 MODULE_VERSION(sem, 1);