1139804Simp/*- 2103571Salfred * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org> 3145855Srwatson * Copyright (c) 2003-2005 SPARTA, Inc. 4142498Srwatson * Copyright (c) 2005 Robert N. M. Watson 5103571Salfred * All rights reserved. 6103571Salfred * 7145855Srwatson * This software was developed for the FreeBSD Project in part by Network 8145855Srwatson * Associates Laboratories, the Security Research Division of Network 9145855Srwatson * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 10145855Srwatson * as part of the DARPA CHATS research program. 11145855Srwatson * 12103571Salfred * Redistribution and use in source and binary forms, with or without 13103571Salfred * modification, are permitted provided that the following conditions 14103571Salfred * are met: 15103571Salfred * 1. Redistributions of source code must retain the above copyright 16103571Salfred * notice, this list of conditions and the following disclaimer. 17103571Salfred * 2. Redistributions in binary form must reproduce the above copyright 18103571Salfred * notice, this list of conditions and the following disclaimer in the 19103571Salfred * documentation and/or other materials provided with the distribution. 20103571Salfred * 21103571Salfred * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22103571Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23103571Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24103571Salfred * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25103571Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26103571Salfred * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27103571Salfred * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28103571Salfred * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29103571Salfred * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30103571Salfred * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31103571Salfred * SUCH DAMAGE. 32103571Salfred */ 33103571Salfred 34116182Sobrien#include <sys/cdefs.h> 35116182Sobrien__FBSDID("$FreeBSD: releng/11.0/sys/kern/uipc_sem.c 297976 2016-04-14 17:07:26Z jamie $"); 36116182Sobrien 37205324Skib#include "opt_compat.h" 38103571Salfred#include "opt_posix.h" 39103571Salfred 40103571Salfred#include <sys/param.h> 41263233Srwatson#include <sys/capsicum.h> 42180059Sjhb#include <sys/condvar.h> 43180059Sjhb#include <sys/fcntl.h> 44180059Sjhb#include <sys/file.h> 45180059Sjhb#include <sys/filedesc.h> 46180059Sjhb#include <sys/fnv_hash.h> 47297935Sjamie#include <sys/jail.h> 48103571Salfred#include <sys/kernel.h> 49164184Strhodes#include <sys/ksem.h> 50180059Sjhb#include <sys/lock.h> 51180059Sjhb#include <sys/malloc.h> 52180059Sjhb#include <sys/module.h> 53180059Sjhb#include <sys/mutex.h> 54164033Srwatson#include <sys/priv.h> 55103571Salfred#include <sys/proc.h> 56164184Strhodes#include <sys/posix4.h> 57180059Sjhb#include <sys/_semaphore.h> 58180059Sjhb#include <sys/stat.h> 59103571Salfred#include <sys/syscall.h> 60180059Sjhb#include <sys/syscallsubr.h> 61180059Sjhb#include <sys/sysctl.h> 62103571Salfred#include <sys/sysent.h> 63180059Sjhb#include <sys/sysproto.h> 64180059Sjhb#include <sys/systm.h> 65180059Sjhb#include <sys/sx.h> 66271976Sjhb#include <sys/user.h> 67180059Sjhb#include <sys/vnode.h> 68103571Salfred 69163606Srwatson#include <security/mac/mac_framework.h> 70163606Srwatson 71219030SnetchildFEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support"); 72180059Sjhb/* 73180059Sjhb * TODO 74180059Sjhb * 75180059Sjhb * - Resource limits? 76180059Sjhb * - Replace global sem_lock with mtx_pool locks? 77180059Sjhb * - Add a MAC check_create() hook for creating new named semaphores. 78180059Sjhb */ 79103571Salfred 80103571Salfred#ifndef SEM_MAX 81179054Srwatson#define SEM_MAX 30 82103571Salfred#endif 83103571Salfred 84180059Sjhb#ifdef SEM_DEBUG 85180059Sjhb#define DP(x) printf x 86180059Sjhb#else 87180059Sjhb#define DP(x) 88180059Sjhb#endif 89103571Salfred 90180059Sjhbstruct ksem_mapping { 91180059Sjhb char *km_path; 92180059Sjhb Fnv32_t km_fnv; 93180059Sjhb struct ksem *km_ksem; 94180059Sjhb LIST_ENTRY(ksem_mapping) km_link; 95180059Sjhb}; 96103571Salfred 97180059Sjhbstatic MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor"); 98180059Sjhbstatic LIST_HEAD(, ksem_mapping) *ksem_dictionary; 99180059Sjhbstatic struct sx ksem_dict_lock; 100180059Sjhbstatic struct mtx ksem_count_lock; 101180059Sjhbstatic struct mtx sem_lock; 102180059Sjhbstatic u_long ksem_hash; 103180059Sjhbstatic int ksem_dead; 104179054Srwatson 105180059Sjhb#define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash]) 106103571Salfred 107103571Salfredstatic int nsems = 0; 108103571SalfredSYSCTL_DECL(_p1003_1b); 109180059SjhbSYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0, 110180059Sjhb "Number of active kernel POSIX semaphores"); 111103571Salfred 112180059Sjhbstatic int kern_sem_wait(struct thread *td, semid_t id, int tryflag, 113180059Sjhb struct timespec *abstime); 114180059Sjhbstatic int ksem_access(struct ksem *ks, struct ucred *ucred); 115180059Sjhbstatic struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode, 116180059Sjhb unsigned int value); 117180059Sjhbstatic int ksem_create(struct thread *td, const char *path, 118180059Sjhb semid_t *semidp, mode_t mode, unsigned int value, 119205324Skib int flags, int compat32); 120180059Sjhbstatic void ksem_drop(struct ksem *ks); 121255219Spjdstatic int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp, 122224778Srwatson struct file **fpp); 123180059Sjhbstatic struct ksem *ksem_hold(struct ksem *ks); 124180059Sjhbstatic void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks); 125180059Sjhbstatic struct ksem *ksem_lookup(char *path, Fnv32_t fnv); 126180059Sjhbstatic void ksem_module_destroy(void); 127180059Sjhbstatic int ksem_module_init(void); 128180059Sjhbstatic int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred); 129180059Sjhbstatic int sem_modload(struct module *module, int cmd, void *arg); 130112564Sjhb 131180059Sjhbstatic fo_stat_t ksem_stat; 132180059Sjhbstatic fo_close_t ksem_closef; 133224914Skibstatic fo_chmod_t ksem_chmod; 134224914Skibstatic fo_chown_t ksem_chown; 135271976Sjhbstatic fo_fill_kinfo_t ksem_fill_kinfo; 136104596Salfred 137180059Sjhb/* File descriptor operations. */ 138180059Sjhbstatic struct fileops ksem_ops = { 139271489Sjhb .fo_read = invfo_rdwr, 140271489Sjhb .fo_write = invfo_rdwr, 141271489Sjhb .fo_truncate = invfo_truncate, 142271489Sjhb .fo_ioctl = invfo_ioctl, 143271489Sjhb .fo_poll = invfo_poll, 144271489Sjhb .fo_kqfilter = invfo_kqfilter, 145180059Sjhb .fo_stat = ksem_stat, 146180059Sjhb .fo_close = ksem_closef, 147224914Skib .fo_chmod = ksem_chmod, 148224914Skib .fo_chown = ksem_chown, 149254356Sglebius .fo_sendfile = invfo_sendfile, 150271976Sjhb .fo_fill_kinfo = ksem_fill_kinfo, 151180059Sjhb .fo_flags = DFLAG_PASSABLE 152180059Sjhb}; 153180059Sjhb 154180059SjhbFEATURE(posix_sem, "POSIX semaphores"); 155180059Sjhb 156180059Sjhbstatic int 157180059Sjhbksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 158180059Sjhb struct thread *td) 159180059Sjhb{ 160180059Sjhb struct ksem *ks; 161180059Sjhb#ifdef MAC 162103571Salfred int error; 163180059Sjhb#endif 164103571Salfred 165180059Sjhb ks = fp->f_data; 166179054Srwatson 167145855Srwatson#ifdef MAC 168180059Sjhb error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks); 169180059Sjhb if (error) 170180059Sjhb return (error); 171145855Srwatson#endif 172180059Sjhb 173180059Sjhb /* 174180059Sjhb * Attempt to return sanish values for fstat() on a semaphore 175180059Sjhb * file descriptor. 176180059Sjhb */ 177180059Sjhb bzero(sb, sizeof(*sb)); 178180059Sjhb 179224914Skib mtx_lock(&sem_lock); 180205792Sed sb->st_atim = ks->ks_atime; 181205792Sed sb->st_ctim = ks->ks_ctime; 182205792Sed sb->st_mtim = ks->ks_mtime; 183224914Skib sb->st_birthtim = ks->ks_birthtime; 184180059Sjhb sb->st_uid = ks->ks_uid; 185180059Sjhb sb->st_gid = ks->ks_gid; 186224914Skib sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */ 187224914Skib mtx_unlock(&sem_lock); 188180059Sjhb 189180059Sjhb return (0); 190103571Salfred} 191103571Salfred 192180059Sjhbstatic int 193224914Skibksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 194224914Skib struct thread *td) 195224914Skib{ 196224914Skib struct ksem *ks; 197224914Skib int error; 198224914Skib 199224914Skib error = 0; 200224914Skib ks = fp->f_data; 201224914Skib mtx_lock(&sem_lock); 202224914Skib#ifdef MAC 203224914Skib error = mac_posixsem_check_setmode(active_cred, ks, mode); 204224914Skib if (error != 0) 205224914Skib goto out; 206224914Skib#endif 207224914Skib error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN, 208224914Skib active_cred, NULL); 209224914Skib if (error != 0) 210224914Skib goto out; 211224914Skib ks->ks_mode = mode & ACCESSPERMS; 212224914Skibout: 213224914Skib mtx_unlock(&sem_lock); 214224914Skib return (error); 215224914Skib} 216224914Skib 217224914Skibstatic int 218224914Skibksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 219224914Skib struct thread *td) 220224914Skib{ 221224914Skib struct ksem *ks; 222224914Skib int error; 223224914Skib 224224935Skib error = 0; 225224914Skib ks = fp->f_data; 226224914Skib mtx_lock(&sem_lock); 227224914Skib#ifdef MAC 228224914Skib error = mac_posixsem_check_setowner(active_cred, ks, uid, gid); 229224914Skib if (error != 0) 230224914Skib goto out; 231224914Skib#endif 232224914Skib if (uid == (uid_t)-1) 233224914Skib uid = ks->ks_uid; 234224914Skib if (gid == (gid_t)-1) 235224914Skib gid = ks->ks_gid; 236224914Skib if (((uid != ks->ks_uid && uid != active_cred->cr_uid) || 237224914Skib (gid != ks->ks_gid && !groupmember(gid, active_cred))) && 238224914Skib (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 239224914Skib goto out; 240224914Skib ks->ks_uid = uid; 241224914Skib ks->ks_gid = gid; 242224914Skibout: 243224914Skib mtx_unlock(&sem_lock); 244224914Skib return (error); 245224914Skib} 246224914Skib 247224914Skibstatic int 248180059Sjhbksem_closef(struct file *fp, struct thread *td) 249103571Salfred{ 250180059Sjhb struct ksem *ks; 251103571Salfred 252180059Sjhb ks = fp->f_data; 253180059Sjhb fp->f_data = NULL; 254180059Sjhb ksem_drop(ks); 255180059Sjhb 256180059Sjhb return (0); 257103571Salfred} 258103571Salfred 259271976Sjhbstatic int 260271976Sjhbksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 261271976Sjhb{ 262297935Sjamie const char *path, *pr_path; 263271976Sjhb struct ksem *ks; 264297935Sjamie size_t pr_pathlen; 265271976Sjhb 266271976Sjhb kif->kf_type = KF_TYPE_SEM; 267271976Sjhb ks = fp->f_data; 268271976Sjhb mtx_lock(&sem_lock); 269271976Sjhb kif->kf_un.kf_sem.kf_sem_value = ks->ks_value; 270271976Sjhb kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */ 271271976Sjhb mtx_unlock(&sem_lock); 272271976Sjhb if (ks->ks_path != NULL) { 273271976Sjhb sx_slock(&ksem_dict_lock); 274297976Sjamie if (ks->ks_path != NULL) { 275297935Sjamie path = ks->ks_path; 276297935Sjamie pr_path = curthread->td_ucred->cr_prison->pr_path; 277297976Sjamie if (strcmp(pr_path, "/") != 0) { 278297976Sjamie /* Return the jail-rooted pathname. */ 279297935Sjamie pr_pathlen = strlen(pr_path); 280297935Sjamie if (strncmp(path, pr_path, pr_pathlen) == 0 && 281297935Sjamie path[pr_pathlen] == '/') 282297935Sjamie path += pr_pathlen; 283297935Sjamie } 284297935Sjamie strlcpy(kif->kf_path, path, sizeof(kif->kf_path)); 285297935Sjamie } 286271976Sjhb sx_sunlock(&ksem_dict_lock); 287271976Sjhb } 288271976Sjhb return (0); 289271976Sjhb} 290271976Sjhb 291180059Sjhb/* 292180059Sjhb * ksem object management including creation and reference counting 293180059Sjhb * routines. 294180059Sjhb */ 295180059Sjhbstatic struct ksem * 296180059Sjhbksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value) 297103571Salfred{ 298103571Salfred struct ksem *ks; 299103571Salfred 300180059Sjhb mtx_lock(&ksem_count_lock); 301180059Sjhb if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) { 302180059Sjhb mtx_unlock(&ksem_count_lock); 303180059Sjhb return (NULL); 304103571Salfred } 305180059Sjhb nsems++; 306180059Sjhb mtx_unlock(&ksem_count_lock); 307180059Sjhb ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO); 308180059Sjhb ks->ks_uid = ucred->cr_uid; 309180059Sjhb ks->ks_gid = ucred->cr_gid; 310180059Sjhb ks->ks_mode = mode; 311180059Sjhb ks->ks_value = value; 312180059Sjhb cv_init(&ks->ks_cv, "ksem"); 313180059Sjhb vfs_timestamp(&ks->ks_birthtime); 314180059Sjhb ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime; 315180059Sjhb refcount_init(&ks->ks_ref, 1); 316180059Sjhb#ifdef MAC 317180059Sjhb mac_posixsem_init(ks); 318180059Sjhb mac_posixsem_create(ucred, ks); 319180059Sjhb#endif 320180059Sjhb 321180059Sjhb return (ks); 322103571Salfred} 323103571Salfred 324180059Sjhbstatic struct ksem * 325180059Sjhbksem_hold(struct ksem *ks) 326180059Sjhb{ 327180059Sjhb 328180059Sjhb refcount_acquire(&ks->ks_ref); 329180059Sjhb return (ks); 330180059Sjhb} 331180059Sjhb 332180059Sjhbstatic void 333180059Sjhbksem_drop(struct ksem *ks) 334180059Sjhb{ 335180059Sjhb 336180059Sjhb if (refcount_release(&ks->ks_ref)) { 337180059Sjhb#ifdef MAC 338180059Sjhb mac_posixsem_destroy(ks); 339103571Salfred#endif 340180059Sjhb cv_destroy(&ks->ks_cv); 341180059Sjhb free(ks, M_KSEM); 342180059Sjhb mtx_lock(&ksem_count_lock); 343180059Sjhb nsems--; 344180059Sjhb mtx_unlock(&ksem_count_lock); 345180059Sjhb } 346180059Sjhb} 347180059Sjhb 348180059Sjhb/* 349180059Sjhb * Determine if the credentials have sufficient permissions for read 350180059Sjhb * and write access. 351180059Sjhb */ 352180059Sjhbstatic int 353180059Sjhbksem_access(struct ksem *ks, struct ucred *ucred) 354103571Salfred{ 355103571Salfred int error; 356103571Salfred 357180059Sjhb error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, 358180059Sjhb VREAD | VWRITE, ucred, NULL); 359103571Salfred if (error) 360180059Sjhb error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0); 361103571Salfred return (error); 362103571Salfred} 363103571Salfred 364180059Sjhb/* 365180059Sjhb * Dictionary management. We maintain an in-kernel dictionary to map 366180059Sjhb * paths to semaphore objects. We use the FNV hash on the path to 367180059Sjhb * store the mappings in a hash table. 368180059Sjhb */ 369180059Sjhbstatic struct ksem * 370180059Sjhbksem_lookup(char *path, Fnv32_t fnv) 371103571Salfred{ 372180059Sjhb struct ksem_mapping *map; 373103571Salfred 374180059Sjhb LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { 375180059Sjhb if (map->km_fnv != fnv) 376180059Sjhb continue; 377180059Sjhb if (strcmp(map->km_path, path) == 0) 378180059Sjhb return (map->km_ksem); 379103571Salfred } 380179054Srwatson 381180059Sjhb return (NULL); 382180059Sjhb} 383179054Srwatson 384180059Sjhbstatic void 385180059Sjhbksem_insert(char *path, Fnv32_t fnv, struct ksem *ks) 386180059Sjhb{ 387180059Sjhb struct ksem_mapping *map; 388179054Srwatson 389180059Sjhb map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK); 390180059Sjhb map->km_path = path; 391180059Sjhb map->km_fnv = fnv; 392180059Sjhb map->km_ksem = ksem_hold(ks); 393250223Sjhb ks->ks_path = path; 394180059Sjhb LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link); 395180059Sjhb} 396180059Sjhb 397180059Sjhbstatic int 398180059Sjhbksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred) 399180059Sjhb{ 400180059Sjhb struct ksem_mapping *map; 401180059Sjhb int error; 402180059Sjhb 403180059Sjhb LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { 404180059Sjhb if (map->km_fnv != fnv) 405180059Sjhb continue; 406180059Sjhb if (strcmp(map->km_path, path) == 0) { 407145855Srwatson#ifdef MAC 408180059Sjhb error = mac_posixsem_check_unlink(ucred, map->km_ksem); 409180059Sjhb if (error) 410180059Sjhb return (error); 411145855Srwatson#endif 412180059Sjhb error = ksem_access(map->km_ksem, ucred); 413180059Sjhb if (error) 414103571Salfred return (error); 415250223Sjhb map->km_ksem->ks_path = NULL; 416180059Sjhb LIST_REMOVE(map, km_link); 417180059Sjhb ksem_drop(map->km_ksem); 418180059Sjhb free(map->km_path, M_KSEM); 419180059Sjhb free(map, M_KSEM); 420180059Sjhb return (0); 421103571Salfred } 422103571Salfred } 423180059Sjhb 424180059Sjhb return (ENOENT); 425103571Salfred} 426103571Salfred 427205324Skibstatic int 428205324Skibksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd, 429205324Skib int compat32) 430205324Skib{ 431205324Skib semid_t semid; 432205324Skib#ifdef COMPAT_FREEBSD32 433205324Skib int32_t semid32; 434205324Skib#endif 435205324Skib void *ptr; 436205324Skib size_t ptrs; 437205324Skib 438205324Skib#ifdef COMPAT_FREEBSD32 439205324Skib if (compat32) { 440205324Skib semid32 = fd; 441205324Skib ptr = &semid32; 442205324Skib ptrs = sizeof(semid32); 443205324Skib } else { 444205324Skib#endif 445205324Skib semid = fd; 446205324Skib ptr = &semid; 447205324Skib ptrs = sizeof(semid); 448205324Skib compat32 = 0; /* silence gcc */ 449205324Skib#ifdef COMPAT_FREEBSD32 450205324Skib } 451205324Skib#endif 452205324Skib 453205324Skib return (copyout(ptr, semidp, ptrs)); 454205324Skib} 455205324Skib 456180059Sjhb/* Other helper routines. */ 457105227Sphkstatic int 458180059Sjhbksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode, 459205324Skib unsigned int value, int flags, int compat32) 460103571Salfred{ 461180059Sjhb struct filedesc *fdp; 462180059Sjhb struct ksem *ks; 463180059Sjhb struct file *fp; 464180059Sjhb char *path; 465297935Sjamie const char *pr_path; 466297935Sjamie size_t pr_pathlen; 467180059Sjhb Fnv32_t fnv; 468180059Sjhb int error, fd; 469103571Salfred 470180059Sjhb if (value > SEM_VALUE_MAX) 471180059Sjhb return (EINVAL); 472180059Sjhb 473180059Sjhb fdp = td->td_proc->p_fd; 474180059Sjhb mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS; 475249233Sjilles error = falloc(td, &fp, &fd, O_CLOEXEC); 476180059Sjhb if (error) { 477180059Sjhb if (name == NULL) 478180059Sjhb error = ENOSPC; 479180059Sjhb return (error); 480180059Sjhb } 481180059Sjhb 482164033Srwatson /* 483180059Sjhb * Go ahead and copyout the file descriptor now. This is a bit 484180059Sjhb * premature, but it is a lot easier to handle errors as opposed 485180059Sjhb * to later when we've possibly created a new semaphore, etc. 486164033Srwatson */ 487205324Skib error = ksem_create_copyout_semid(td, semidp, fd, compat32); 488180059Sjhb if (error) { 489281436Smjg fdclose(td, fp, fd); 490180059Sjhb fdrop(fp, td); 491180059Sjhb return (error); 492180059Sjhb } 493103571Salfred 494180059Sjhb if (name == NULL) { 495180059Sjhb /* Create an anonymous semaphore. */ 496180059Sjhb ks = ksem_alloc(td->td_ucred, mode, value); 497180059Sjhb if (ks == NULL) 498180059Sjhb error = ENOSPC; 499180059Sjhb else 500180059Sjhb ks->ks_flags |= KS_ANONYMOUS; 501180059Sjhb } else { 502180059Sjhb path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK); 503297935Sjamie pr_path = td->td_ucred->cr_prison->pr_path; 504297976Sjamie 505297976Sjamie /* Construct a full pathname for jailed callers. */ 506297935Sjamie pr_pathlen = strcmp(pr_path, "/") == 0 ? 0 507297935Sjamie : strlcpy(path, pr_path, MAXPATHLEN); 508297935Sjamie error = copyinstr(name, path + pr_pathlen, 509297935Sjamie MAXPATHLEN - pr_pathlen, NULL); 510103571Salfred 511180059Sjhb /* Require paths to start with a '/' character. */ 512297935Sjamie if (error == 0 && path[pr_pathlen] != '/') 513180059Sjhb error = EINVAL; 514180059Sjhb if (error) { 515281436Smjg fdclose(td, fp, fd); 516180059Sjhb fdrop(fp, td); 517180059Sjhb free(path, M_KSEM); 518180059Sjhb return (error); 519180059Sjhb } 520180059Sjhb 521180059Sjhb fnv = fnv_32_str(path, FNV1_32_INIT); 522180059Sjhb sx_xlock(&ksem_dict_lock); 523180059Sjhb ks = ksem_lookup(path, fnv); 524180059Sjhb if (ks == NULL) { 525180059Sjhb /* Object does not exist, create it if requested. */ 526180059Sjhb if (flags & O_CREAT) { 527180059Sjhb ks = ksem_alloc(td->td_ucred, mode, value); 528180059Sjhb if (ks == NULL) 529180059Sjhb error = ENFILE; 530180059Sjhb else { 531180059Sjhb ksem_insert(path, fnv, ks); 532180059Sjhb path = NULL; 533180059Sjhb } 534180059Sjhb } else 535180059Sjhb error = ENOENT; 536180059Sjhb } else { 537180059Sjhb /* 538180059Sjhb * Object already exists, obtain a new 539180059Sjhb * reference if requested and permitted. 540180059Sjhb */ 541180059Sjhb if ((flags & (O_CREAT | O_EXCL)) == 542180059Sjhb (O_CREAT | O_EXCL)) 543180059Sjhb error = EEXIST; 544180059Sjhb else { 545175148Srwatson#ifdef MAC 546180059Sjhb error = mac_posixsem_check_open(td->td_ucred, 547180059Sjhb ks); 548180059Sjhb if (error == 0) 549175148Srwatson#endif 550180059Sjhb error = ksem_access(ks, td->td_ucred); 551180059Sjhb } 552180059Sjhb if (error == 0) 553180059Sjhb ksem_hold(ks); 554180059Sjhb#ifdef INVARIANTS 555180059Sjhb else 556180059Sjhb ks = NULL; 557180059Sjhb#endif 558180059Sjhb } 559180059Sjhb sx_xunlock(&ksem_dict_lock); 560180059Sjhb if (path) 561180059Sjhb free(path, M_KSEM); 562180059Sjhb } 563103571Salfred 564180059Sjhb if (error) { 565180059Sjhb KASSERT(ks == NULL, ("ksem_create error with a ksem")); 566281436Smjg fdclose(td, fp, fd); 567180059Sjhb fdrop(fp, td); 568180059Sjhb return (error); 569180059Sjhb } 570180059Sjhb KASSERT(ks != NULL, ("ksem_create w/o a ksem")); 571103571Salfred 572180059Sjhb finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops); 573180059Sjhb 574180059Sjhb fdrop(fp, td); 575180059Sjhb 576180059Sjhb return (0); 577103571Salfred} 578103571Salfred 579105227Sphkstatic int 580255219Spjdksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp, 581255219Spjd struct file **fpp) 582103571Salfred{ 583180059Sjhb struct ksem *ks; 584180059Sjhb struct file *fp; 585180059Sjhb int error; 586180059Sjhb 587255219Spjd error = fget(td, id, rightsp, &fp); 588180059Sjhb if (error) 589180059Sjhb return (EINVAL); 590180059Sjhb if (fp->f_type != DTYPE_SEM) { 591180059Sjhb fdrop(fp, td); 592180059Sjhb return (EINVAL); 593180059Sjhb } 594180059Sjhb ks = fp->f_data; 595180059Sjhb if (ks->ks_flags & KS_DEAD) { 596180059Sjhb fdrop(fp, td); 597180059Sjhb return (EINVAL); 598180059Sjhb } 599180059Sjhb *fpp = fp; 600180059Sjhb return (0); 601103571Salfred} 602103571Salfred 603180059Sjhb/* System calls. */ 604180059Sjhb#ifndef _SYS_SYSPROTO_H_ 605180059Sjhbstruct ksem_init_args { 606180059Sjhb unsigned int value; 607180059Sjhb semid_t *idp; 608180059Sjhb}; 609180059Sjhb#endif 610180059Sjhbint 611225617Skmacysys_ksem_init(struct thread *td, struct ksem_init_args *uap) 612103571Salfred{ 613103571Salfred 614180059Sjhb return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 615205324Skib 0, 0)); 616103571Salfred} 617103571Salfred 618180059Sjhb#ifndef _SYS_SYSPROTO_H_ 619180059Sjhbstruct ksem_open_args { 620180059Sjhb char *name; 621180059Sjhb int oflag; 622180059Sjhb mode_t mode; 623180059Sjhb unsigned int value; 624180059Sjhb semid_t *idp; 625180059Sjhb}; 626180059Sjhb#endif 627180059Sjhbint 628225617Skmacysys_ksem_open(struct thread *td, struct ksem_open_args *uap) 629103571Salfred{ 630103571Salfred 631189735Sbms DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid)); 632189735Sbms 633180059Sjhb if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) 634180059Sjhb return (EINVAL); 635180059Sjhb return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, 636205324Skib uap->oflag, 0)); 637103571Salfred} 638103571Salfred 639103571Salfred#ifndef _SYS_SYSPROTO_H_ 640103571Salfredstruct ksem_unlink_args { 641180059Sjhb char *name; 642103571Salfred}; 643103571Salfred#endif 644103571Salfredint 645225617Skmacysys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap) 646103571Salfred{ 647180059Sjhb char *path; 648297935Sjamie const char *pr_path; 649297935Sjamie size_t pr_pathlen; 650180059Sjhb Fnv32_t fnv; 651103571Salfred int error; 652103571Salfred 653180059Sjhb path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 654297935Sjamie pr_path = td->td_ucred->cr_prison->pr_path; 655297935Sjamie pr_pathlen = strcmp(pr_path, "/") == 0 ? 0 656297935Sjamie : strlcpy(path, pr_path, MAXPATHLEN); 657297935Sjamie error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen, 658297935Sjamie NULL); 659180059Sjhb if (error) { 660180059Sjhb free(path, M_TEMP); 661180059Sjhb return (error); 662180059Sjhb } 663103571Salfred 664180059Sjhb fnv = fnv_32_str(path, FNV1_32_INIT); 665180059Sjhb sx_xlock(&ksem_dict_lock); 666180059Sjhb error = ksem_remove(path, fnv, td->td_ucred); 667180059Sjhb sx_xunlock(&ksem_dict_lock); 668180059Sjhb free(path, M_TEMP); 669103571Salfred 670103571Salfred return (error); 671103571Salfred} 672103571Salfred 673103571Salfred#ifndef _SYS_SYSPROTO_H_ 674103571Salfredstruct ksem_close_args { 675180059Sjhb semid_t id; 676103571Salfred}; 677103571Salfred#endif 678103571Salfredint 679225617Skmacysys_ksem_close(struct thread *td, struct ksem_close_args *uap) 680103571Salfred{ 681285829Spluknet cap_rights_t rights; 682103571Salfred struct ksem *ks; 683180059Sjhb struct file *fp; 684103571Salfred int error; 685103571Salfred 686224778Srwatson /* No capability rights required to close a semaphore. */ 687285829Spluknet error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp); 688180059Sjhb if (error) 689180059Sjhb return (error); 690180059Sjhb ks = fp->f_data; 691180059Sjhb if (ks->ks_flags & KS_ANONYMOUS) { 692180059Sjhb fdrop(fp, td); 693180059Sjhb return (EINVAL); 694180059Sjhb } 695180059Sjhb error = kern_close(td, uap->id); 696180059Sjhb fdrop(fp, td); 697109084Salfred return (error); 698103571Salfred} 699103571Salfred 700103571Salfred#ifndef _SYS_SYSPROTO_H_ 701103571Salfredstruct ksem_post_args { 702180059Sjhb semid_t id; 703103571Salfred}; 704103571Salfred#endif 705103571Salfredint 706225617Skmacysys_ksem_post(struct thread *td, struct ksem_post_args *uap) 707103571Salfred{ 708255219Spjd cap_rights_t rights; 709180059Sjhb struct file *fp; 710103571Salfred struct ksem *ks; 711103571Salfred int error; 712103571Salfred 713255219Spjd error = ksem_get(td, uap->id, 714255219Spjd cap_rights_init(&rights, CAP_SEM_POST), &fp); 715180059Sjhb if (error) 716180059Sjhb return (error); 717180059Sjhb ks = fp->f_data; 718180059Sjhb 719103571Salfred mtx_lock(&sem_lock); 720145855Srwatson#ifdef MAC 721180059Sjhb error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks); 722145855Srwatson if (error) 723145855Srwatson goto err; 724145855Srwatson#endif 725103571Salfred if (ks->ks_value == SEM_VALUE_MAX) { 726103571Salfred error = EOVERFLOW; 727103571Salfred goto err; 728103571Salfred } 729103571Salfred ++ks->ks_value; 730103571Salfred if (ks->ks_waiters > 0) 731103571Salfred cv_signal(&ks->ks_cv); 732103571Salfred error = 0; 733180059Sjhb vfs_timestamp(&ks->ks_ctime); 734103571Salfrederr: 735103571Salfred mtx_unlock(&sem_lock); 736180059Sjhb fdrop(fp, td); 737103571Salfred return (error); 738103571Salfred} 739103571Salfred 740103571Salfred#ifndef _SYS_SYSPROTO_H_ 741103571Salfredstruct ksem_wait_args { 742180059Sjhb semid_t id; 743103571Salfred}; 744103571Salfred#endif 745103571Salfredint 746225617Skmacysys_ksem_wait(struct thread *td, struct ksem_wait_args *uap) 747103571Salfred{ 748103571Salfred 749125368Sdeischen return (kern_sem_wait(td, uap->id, 0, NULL)); 750103571Salfred} 751103571Salfred 752103571Salfred#ifndef _SYS_SYSPROTO_H_ 753125368Sdeischenstruct ksem_timedwait_args { 754180059Sjhb semid_t id; 755151445Sstefanf const struct timespec *abstime; 756125368Sdeischen}; 757125368Sdeischen#endif 758125368Sdeischenint 759225617Skmacysys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap) 760125368Sdeischen{ 761125368Sdeischen struct timespec abstime; 762125368Sdeischen struct timespec *ts; 763125368Sdeischen int error; 764125368Sdeischen 765179054Srwatson /* 766179054Srwatson * We allow a null timespec (wait forever). 767179054Srwatson */ 768125368Sdeischen if (uap->abstime == NULL) 769125368Sdeischen ts = NULL; 770125368Sdeischen else { 771125368Sdeischen error = copyin(uap->abstime, &abstime, sizeof(abstime)); 772125368Sdeischen if (error != 0) 773125368Sdeischen return (error); 774125368Sdeischen if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 775125368Sdeischen return (EINVAL); 776125368Sdeischen ts = &abstime; 777125368Sdeischen } 778125368Sdeischen return (kern_sem_wait(td, uap->id, 0, ts)); 779125368Sdeischen} 780125368Sdeischen 781125368Sdeischen#ifndef _SYS_SYSPROTO_H_ 782103571Salfredstruct ksem_trywait_args { 783180059Sjhb semid_t id; 784103571Salfred}; 785103571Salfred#endif 786103571Salfredint 787225617Skmacysys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap) 788103571Salfred{ 789103571Salfred 790125368Sdeischen return (kern_sem_wait(td, uap->id, 1, NULL)); 791103571Salfred} 792103571Salfred 793105227Sphkstatic int 794154659Srwatsonkern_sem_wait(struct thread *td, semid_t id, int tryflag, 795154659Srwatson struct timespec *abstime) 796103571Salfred{ 797125368Sdeischen struct timespec ts1, ts2; 798125368Sdeischen struct timeval tv; 799255219Spjd cap_rights_t rights; 800180059Sjhb struct file *fp; 801103571Salfred struct ksem *ks; 802103571Salfred int error; 803103571Salfred 804189735Sbms DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid)); 805255219Spjd error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp); 806180059Sjhb if (error) 807180059Sjhb return (error); 808180059Sjhb ks = fp->f_data; 809103571Salfred mtx_lock(&sem_lock); 810189735Sbms DP((">>> kern_sem_wait critical section entered! pid=%d\n", 811189735Sbms (int)td->td_proc->p_pid)); 812145855Srwatson#ifdef MAC 813180059Sjhb error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks); 814145855Srwatson if (error) { 815145855Srwatson DP(("kern_sem_wait mac failed\n")); 816145855Srwatson goto err; 817145855Srwatson } 818145855Srwatson#endif 819104596Salfred DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); 820180059Sjhb vfs_timestamp(&ks->ks_atime); 821189736Sbms while (ks->ks_value == 0) { 822103571Salfred ks->ks_waiters++; 823125368Sdeischen if (tryflag != 0) 824125368Sdeischen error = EAGAIN; 825125368Sdeischen else if (abstime == NULL) 826125368Sdeischen error = cv_wait_sig(&ks->ks_cv, &sem_lock); 827125368Sdeischen else { 828125368Sdeischen for (;;) { 829125368Sdeischen ts1 = *abstime; 830125368Sdeischen getnanotime(&ts2); 831125368Sdeischen timespecsub(&ts1, &ts2); 832125368Sdeischen TIMESPEC_TO_TIMEVAL(&tv, &ts1); 833125368Sdeischen if (tv.tv_sec < 0) { 834125368Sdeischen error = ETIMEDOUT; 835125368Sdeischen break; 836125368Sdeischen } 837125368Sdeischen error = cv_timedwait_sig(&ks->ks_cv, 838125368Sdeischen &sem_lock, tvtohz(&tv)); 839125368Sdeischen if (error != EWOULDBLOCK) 840125368Sdeischen break; 841125368Sdeischen } 842125368Sdeischen } 843103571Salfred ks->ks_waiters--; 844103571Salfred if (error) 845103571Salfred goto err; 846103571Salfred } 847103571Salfred ks->ks_value--; 848189735Sbms DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value)); 849103571Salfred error = 0; 850103571Salfrederr: 851103571Salfred mtx_unlock(&sem_lock); 852180059Sjhb fdrop(fp, td); 853189735Sbms DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n", 854189735Sbms (int)td->td_proc->p_pid, error)); 855103571Salfred return (error); 856103571Salfred} 857103571Salfred 858103571Salfred#ifndef _SYS_SYSPROTO_H_ 859103571Salfredstruct ksem_getvalue_args { 860180059Sjhb semid_t id; 861180059Sjhb int *val; 862103571Salfred}; 863103571Salfred#endif 864103571Salfredint 865225617Skmacysys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap) 866103571Salfred{ 867255219Spjd cap_rights_t rights; 868180059Sjhb struct file *fp; 869103571Salfred struct ksem *ks; 870103571Salfred int error, val; 871103571Salfred 872255219Spjd error = ksem_get(td, uap->id, 873255219Spjd cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp); 874180059Sjhb if (error) 875180059Sjhb return (error); 876180059Sjhb ks = fp->f_data; 877180059Sjhb 878103571Salfred mtx_lock(&sem_lock); 879145855Srwatson#ifdef MAC 880180059Sjhb error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks); 881145855Srwatson if (error) { 882145855Srwatson mtx_unlock(&sem_lock); 883180059Sjhb fdrop(fp, td); 884145855Srwatson return (error); 885145855Srwatson } 886145855Srwatson#endif 887103571Salfred val = ks->ks_value; 888180059Sjhb vfs_timestamp(&ks->ks_atime); 889103571Salfred mtx_unlock(&sem_lock); 890180059Sjhb fdrop(fp, td); 891103571Salfred error = copyout(&val, uap->val, sizeof(val)); 892103571Salfred return (error); 893103571Salfred} 894103571Salfred 895103571Salfred#ifndef _SYS_SYSPROTO_H_ 896103571Salfredstruct ksem_destroy_args { 897180059Sjhb semid_t id; 898103571Salfred}; 899103571Salfred#endif 900103571Salfredint 901225617Skmacysys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap) 902103571Salfred{ 903285829Spluknet cap_rights_t rights; 904180059Sjhb struct file *fp; 905103571Salfred struct ksem *ks; 906103571Salfred int error; 907103571Salfred 908224778Srwatson /* No capability rights required to close a semaphore. */ 909285829Spluknet error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp); 910180059Sjhb if (error) 911180059Sjhb return (error); 912180059Sjhb ks = fp->f_data; 913180059Sjhb if (!(ks->ks_flags & KS_ANONYMOUS)) { 914180059Sjhb fdrop(fp, td); 915180059Sjhb return (EINVAL); 916180059Sjhb } 917103571Salfred mtx_lock(&sem_lock); 918103571Salfred if (ks->ks_waiters != 0) { 919180059Sjhb mtx_unlock(&sem_lock); 920103571Salfred error = EBUSY; 921103571Salfred goto err; 922103571Salfred } 923180059Sjhb ks->ks_flags |= KS_DEAD; 924180059Sjhb mtx_unlock(&sem_lock); 925180059Sjhb 926180059Sjhb error = kern_close(td, uap->id); 927103571Salfrederr: 928180059Sjhb fdrop(fp, td); 929103571Salfred return (error); 930103571Salfred} 931103571Salfred 932205324Skibstatic struct syscall_helper_data ksem_syscalls[] = { 933205324Skib SYSCALL_INIT_HELPER(ksem_init), 934205324Skib SYSCALL_INIT_HELPER(ksem_open), 935205324Skib SYSCALL_INIT_HELPER(ksem_unlink), 936205324Skib SYSCALL_INIT_HELPER(ksem_close), 937205324Skib SYSCALL_INIT_HELPER(ksem_post), 938205324Skib SYSCALL_INIT_HELPER(ksem_wait), 939205324Skib SYSCALL_INIT_HELPER(ksem_timedwait), 940205324Skib SYSCALL_INIT_HELPER(ksem_trywait), 941205324Skib SYSCALL_INIT_HELPER(ksem_getvalue), 942205324Skib SYSCALL_INIT_HELPER(ksem_destroy), 943205324Skib SYSCALL_INIT_LAST 944205324Skib}; 945142498Srwatson 946205324Skib#ifdef COMPAT_FREEBSD32 947205324Skib#include <compat/freebsd32/freebsd32.h> 948205324Skib#include <compat/freebsd32/freebsd32_proto.h> 949205324Skib#include <compat/freebsd32/freebsd32_signal.h> 950205324Skib#include <compat/freebsd32/freebsd32_syscall.h> 951205324Skib#include <compat/freebsd32/freebsd32_util.h> 952142498Srwatson 953205324Skibint 954205324Skibfreebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap) 955205324Skib{ 956142498Srwatson 957205324Skib return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 958205324Skib 0, 1)); 959205324Skib} 960180059Sjhb 961205324Skibint 962205324Skibfreebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap) 963205324Skib{ 964205324Skib 965205324Skib if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) 966205324Skib return (EINVAL); 967205324Skib return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, 968205324Skib uap->oflag, 1)); 969205324Skib} 970205324Skib 971205324Skibint 972205324Skibfreebsd32_ksem_timedwait(struct thread *td, 973205324Skib struct freebsd32_ksem_timedwait_args *uap) 974205324Skib{ 975205324Skib struct timespec32 abstime32; 976205324Skib struct timespec *ts, abstime; 977205324Skib int error; 978205324Skib 979205324Skib /* 980205324Skib * We allow a null timespec (wait forever). 981205324Skib */ 982205324Skib if (uap->abstime == NULL) 983205324Skib ts = NULL; 984205324Skib else { 985205324Skib error = copyin(uap->abstime, &abstime32, sizeof(abstime32)); 986205324Skib if (error != 0) 987205324Skib return (error); 988205324Skib CP(abstime32, abstime, tv_sec); 989205324Skib CP(abstime32, abstime, tv_nsec); 990205324Skib if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 991205324Skib return (EINVAL); 992205324Skib ts = &abstime; 993205324Skib } 994205324Skib return (kern_sem_wait(td, uap->id, 0, ts)); 995205324Skib} 996205324Skib 997205324Skibstatic struct syscall_helper_data ksem32_syscalls[] = { 998205324Skib SYSCALL32_INIT_HELPER(freebsd32_ksem_init), 999205324Skib SYSCALL32_INIT_HELPER(freebsd32_ksem_open), 1000225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink), 1001225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_close), 1002225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_post), 1003225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_wait), 1004205324Skib SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait), 1005225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait), 1006225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue), 1007225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy), 1008205324Skib SYSCALL_INIT_LAST 1009205324Skib}; 1010205324Skib#endif 1011205324Skib 1012180059Sjhbstatic int 1013180059Sjhbksem_module_init(void) 1014142498Srwatson{ 1015180059Sjhb int error; 1016142498Srwatson 1017180059Sjhb mtx_init(&sem_lock, "sem", NULL, MTX_DEF); 1018180059Sjhb mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF); 1019180059Sjhb sx_init(&ksem_dict_lock, "ksem dictionary"); 1020180059Sjhb ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash); 1021215541Sjhb p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L); 1022180059Sjhb p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX); 1023180059Sjhb p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX); 1024179054Srwatson 1025273707Smjg error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD); 1026205324Skib if (error) 1027205324Skib return (error); 1028205324Skib#ifdef COMPAT_FREEBSD32 1029273707Smjg error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD); 1030205324Skib if (error) 1031205324Skib return (error); 1032205324Skib#endif 1033180059Sjhb return (0); 1034142498Srwatson} 1035142498Srwatson 1036142498Srwatsonstatic void 1037180059Sjhbksem_module_destroy(void) 1038103571Salfred{ 1039161302Snetchild 1040205324Skib#ifdef COMPAT_FREEBSD32 1041205324Skib syscall32_helper_unregister(ksem32_syscalls); 1042205324Skib#endif 1043205324Skib syscall_helper_unregister(ksem_syscalls); 1044103571Salfred 1045215541Sjhb p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0); 1046180059Sjhb hashdestroy(ksem_dictionary, M_KSEM, ksem_hash); 1047180059Sjhb sx_destroy(&ksem_dict_lock); 1048180059Sjhb mtx_destroy(&ksem_count_lock); 1049180059Sjhb mtx_destroy(&sem_lock); 1050208731Skib p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX); 1051208731Skib p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX); 1052103571Salfred} 1053103571Salfred 1054103571Salfredstatic int 1055103571Salfredsem_modload(struct module *module, int cmd, void *arg) 1056103571Salfred{ 1057103571Salfred int error = 0; 1058103571Salfred 1059103571Salfred switch (cmd) { 1060103571Salfred case MOD_LOAD: 1061180059Sjhb error = ksem_module_init(); 1062180059Sjhb if (error) 1063180059Sjhb ksem_module_destroy(); 1064103571Salfred break; 1065179054Srwatson 1066103571Salfred case MOD_UNLOAD: 1067180059Sjhb mtx_lock(&ksem_count_lock); 1068103571Salfred if (nsems != 0) { 1069103571Salfred error = EOPNOTSUPP; 1070180059Sjhb mtx_unlock(&ksem_count_lock); 1071103571Salfred break; 1072103571Salfred } 1073180059Sjhb ksem_dead = 1; 1074180059Sjhb mtx_unlock(&ksem_count_lock); 1075180059Sjhb ksem_module_destroy(); 1076103571Salfred break; 1077179054Srwatson 1078103571Salfred case MOD_SHUTDOWN: 1079103571Salfred break; 1080103571Salfred default: 1081103571Salfred error = EINVAL; 1082103571Salfred break; 1083103571Salfred } 1084103571Salfred return (error); 1085103571Salfred} 1086103571Salfred 1087103571Salfredstatic moduledata_t sem_mod = { 1088103571Salfred "sem", 1089103571Salfred &sem_modload, 1090103571Salfred NULL 1091103571Salfred}; 1092103571Salfred 1093103571SalfredDECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST); 1094103571SalfredMODULE_VERSION(sem, 1); 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