19454b2d8SWarner Losh /*- 2efaa6588SAlfred Perlstein * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org> 352648411SRobert Watson * Copyright (c) 2003-2005 SPARTA, Inc. 4590f242cSRobert Watson * Copyright (c) 2005 Robert N. M. Watson 5efaa6588SAlfred Perlstein * All rights reserved. 6efaa6588SAlfred Perlstein * 752648411SRobert Watson * This software was developed for the FreeBSD Project in part by Network 852648411SRobert Watson * Associates Laboratories, the Security Research Division of Network 952648411SRobert Watson * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), 1052648411SRobert Watson * as part of the DARPA CHATS research program. 1152648411SRobert Watson * 12efaa6588SAlfred Perlstein * Redistribution and use in source and binary forms, with or without 13efaa6588SAlfred Perlstein * modification, are permitted provided that the following conditions 14efaa6588SAlfred Perlstein * are met: 15efaa6588SAlfred Perlstein * 1. Redistributions of source code must retain the above copyright 16efaa6588SAlfred Perlstein * notice, this list of conditions and the following disclaimer. 17efaa6588SAlfred Perlstein * 2. Redistributions in binary form must reproduce the above copyright 18efaa6588SAlfred Perlstein * notice, this list of conditions and the following disclaimer in the 19efaa6588SAlfred Perlstein * documentation and/or other materials provided with the distribution. 20efaa6588SAlfred Perlstein * 21efaa6588SAlfred Perlstein * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22efaa6588SAlfred Perlstein * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23efaa6588SAlfred Perlstein * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24efaa6588SAlfred Perlstein * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25efaa6588SAlfred Perlstein * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26efaa6588SAlfred Perlstein * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27efaa6588SAlfred Perlstein * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28efaa6588SAlfred Perlstein * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29efaa6588SAlfred Perlstein * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30efaa6588SAlfred Perlstein * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31efaa6588SAlfred Perlstein * SUCH DAMAGE. 32efaa6588SAlfred Perlstein */ 33efaa6588SAlfred Perlstein 34677b542eSDavid E. O'Brien #include <sys/cdefs.h> 35677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$"); 36677b542eSDavid E. O'Brien 3752648411SRobert Watson #include "opt_mac.h" 38efaa6588SAlfred Perlstein #include "opt_posix.h" 39efaa6588SAlfred Perlstein 40efaa6588SAlfred Perlstein #include <sys/param.h> 41efaa6588SAlfred Perlstein #include <sys/systm.h> 42efaa6588SAlfred Perlstein #include <sys/sysproto.h> 4375b8b3b2SJohn Baldwin #include <sys/eventhandler.h> 44efaa6588SAlfred Perlstein #include <sys/kernel.h> 456aeb05d7STom Rhodes #include <sys/ksem.h> 46acd3428bSRobert Watson #include <sys/priv.h> 47efaa6588SAlfred Perlstein #include <sys/proc.h> 486aeb05d7STom Rhodes #include <sys/posix4.h> 49efaa6588SAlfred Perlstein #include <sys/lock.h> 50efaa6588SAlfred Perlstein #include <sys/mutex.h> 5177409fe1SPoul-Henning Kamp #include <sys/module.h> 52efaa6588SAlfred Perlstein #include <sys/condvar.h> 53efaa6588SAlfred Perlstein #include <sys/sem.h> 54efaa6588SAlfred Perlstein #include <sys/uio.h> 556aeb05d7STom Rhodes #include <sys/semaphore.h> 56efaa6588SAlfred Perlstein #include <sys/syscall.h> 57efaa6588SAlfred Perlstein #include <sys/stat.h> 58efaa6588SAlfred Perlstein #include <sys/sysent.h> 59efaa6588SAlfred Perlstein #include <sys/sysctl.h> 60aae94fbbSDaniel Eischen #include <sys/time.h> 61efaa6588SAlfred Perlstein #include <sys/malloc.h> 62efaa6588SAlfred Perlstein #include <sys/fcntl.h> 636aeb05d7STom Rhodes #include <sys/_semaphore.h> 64efaa6588SAlfred Perlstein 65aed55708SRobert Watson #include <security/mac/mac_framework.h> 66aed55708SRobert Watson 67590f242cSRobert Watson static int sem_count_proc(struct proc *p); 68efaa6588SAlfred Perlstein static struct ksem *sem_lookup_byname(const char *name); 69efaa6588SAlfred Perlstein static int sem_create(struct thread *td, const char *name, 70efaa6588SAlfred Perlstein struct ksem **ksret, mode_t mode, unsigned int value); 71efaa6588SAlfred Perlstein static void sem_free(struct ksem *ksnew); 72b2546660SJohn Baldwin static int sem_perm(struct thread *td, struct ksem *ks); 73efaa6588SAlfred Perlstein static void sem_enter(struct proc *p, struct ksem *ks); 74efaa6588SAlfred Perlstein static int sem_leave(struct proc *p, struct ksem *ks); 75993182e5SAlexander Leidinger static void sem_exechook(void *arg, struct proc *p, struct image_params *imgp); 7675b8b3b2SJohn Baldwin static void sem_exithook(void *arg, struct proc *p); 77590f242cSRobert Watson static void sem_forkhook(void *arg, struct proc *p1, struct proc *p2, 78590f242cSRobert Watson int flags); 79b2546660SJohn Baldwin static int sem_hasopen(struct thread *td, struct ksem *ks); 80efaa6588SAlfred Perlstein 81efaa6588SAlfred Perlstein static int kern_sem_close(struct thread *td, semid_t id); 82efaa6588SAlfred Perlstein static int kern_sem_post(struct thread *td, semid_t id); 83aae94fbbSDaniel Eischen static int kern_sem_wait(struct thread *td, semid_t id, int tryflag, 84aae94fbbSDaniel Eischen struct timespec *abstime); 85efaa6588SAlfred Perlstein static int kern_sem_init(struct thread *td, int dir, unsigned int value, 86efaa6588SAlfred Perlstein semid_t *idp); 87efaa6588SAlfred Perlstein static int kern_sem_open(struct thread *td, int dir, const char *name, 88efaa6588SAlfred Perlstein int oflag, mode_t mode, unsigned int value, semid_t *idp); 89efaa6588SAlfred Perlstein static int kern_sem_unlink(struct thread *td, const char *name); 90efaa6588SAlfred Perlstein 91efaa6588SAlfred Perlstein #ifndef SEM_MAX 92efaa6588SAlfred Perlstein #define SEM_MAX 30 93efaa6588SAlfred Perlstein #endif 94efaa6588SAlfred Perlstein 95efaa6588SAlfred Perlstein #define SEM_MAX_NAMELEN 14 96efaa6588SAlfred Perlstein 97efaa6588SAlfred Perlstein #define SEM_TO_ID(x) ((intptr_t)(x)) 98efaa6588SAlfred Perlstein #define ID_TO_SEM(x) id_to_sem(x) 99efaa6588SAlfred Perlstein 100efaa6588SAlfred Perlstein /* 101efaa6588SAlfred Perlstein * available semaphores go here, this includes sem_init and any semaphores 102efaa6588SAlfred Perlstein * created via sem_open that have not yet been unlinked. 103efaa6588SAlfred Perlstein */ 104efaa6588SAlfred Perlstein LIST_HEAD(, ksem) ksem_head = LIST_HEAD_INITIALIZER(&ksem_head); 105efaa6588SAlfred Perlstein /* 106efaa6588SAlfred Perlstein * semaphores still in use but have been sem_unlink()'d go here. 107efaa6588SAlfred Perlstein */ 108efaa6588SAlfred Perlstein LIST_HEAD(, ksem) ksem_deadhead = LIST_HEAD_INITIALIZER(&ksem_deadhead); 109efaa6588SAlfred Perlstein 110efaa6588SAlfred Perlstein static struct mtx sem_lock; 111efaa6588SAlfred Perlstein static MALLOC_DEFINE(M_SEM, "sems", "semaphore data"); 112efaa6588SAlfred Perlstein 113efaa6588SAlfred Perlstein static int nsems = 0; 114efaa6588SAlfred Perlstein SYSCTL_DECL(_p1003_1b); 115efaa6588SAlfred Perlstein SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0, ""); 116efaa6588SAlfred Perlstein 117590f242cSRobert Watson static eventhandler_tag sem_exit_tag, sem_exec_tag, sem_fork_tag; 11875b8b3b2SJohn Baldwin 119c814aa3fSAlfred Perlstein #ifdef SEM_DEBUG 120c814aa3fSAlfred Perlstein #define DP(x) printf x 121c814aa3fSAlfred Perlstein #else 122c814aa3fSAlfred Perlstein #define DP(x) 123c814aa3fSAlfred Perlstein #endif 124c814aa3fSAlfred Perlstein 125efaa6588SAlfred Perlstein static __inline 126efaa6588SAlfred Perlstein void 127efaa6588SAlfred Perlstein sem_ref(struct ksem *ks) 128efaa6588SAlfred Perlstein { 129efaa6588SAlfred Perlstein 1300fddf92dSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 131efaa6588SAlfred Perlstein ks->ks_ref++; 132c814aa3fSAlfred Perlstein DP(("sem_ref: ks = %p, ref = %d\n", ks, ks->ks_ref)); 133efaa6588SAlfred Perlstein } 134efaa6588SAlfred Perlstein 135efaa6588SAlfred Perlstein static __inline 136efaa6588SAlfred Perlstein void 137efaa6588SAlfred Perlstein sem_rel(struct ksem *ks) 138efaa6588SAlfred Perlstein { 139efaa6588SAlfred Perlstein 1400fddf92dSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 141c814aa3fSAlfred Perlstein DP(("sem_rel: ks = %p, ref = %d\n", ks, ks->ks_ref - 1)); 142efaa6588SAlfred Perlstein if (--ks->ks_ref == 0) 143efaa6588SAlfred Perlstein sem_free(ks); 144efaa6588SAlfred Perlstein } 145efaa6588SAlfred Perlstein 146efaa6588SAlfred Perlstein static __inline struct ksem *id_to_sem(semid_t id); 147efaa6588SAlfred Perlstein 148efaa6588SAlfred Perlstein static __inline 149efaa6588SAlfred Perlstein struct ksem * 150c1250af6SRobert Watson id_to_sem(semid_t id) 151efaa6588SAlfred Perlstein { 152efaa6588SAlfred Perlstein struct ksem *ks; 153efaa6588SAlfred Perlstein 154955ec415SRobert Watson mtx_assert(&sem_lock, MA_OWNED); 155c814aa3fSAlfred Perlstein DP(("id_to_sem: id = %0x,%p\n", id, (struct ksem *)id)); 156efaa6588SAlfred Perlstein LIST_FOREACH(ks, &ksem_head, ks_entry) { 157c814aa3fSAlfred Perlstein DP(("id_to_sem: ks = %p\n", ks)); 158efaa6588SAlfred Perlstein if (ks == (struct ksem *)id) 159efaa6588SAlfred Perlstein return (ks); 160efaa6588SAlfred Perlstein } 161efaa6588SAlfred Perlstein return (NULL); 162efaa6588SAlfred Perlstein } 163efaa6588SAlfred Perlstein 164c3053131SPoul-Henning Kamp static struct ksem * 165c1250af6SRobert Watson sem_lookup_byname(const char *name) 166efaa6588SAlfred Perlstein { 167efaa6588SAlfred Perlstein struct ksem *ks; 168efaa6588SAlfred Perlstein 169955ec415SRobert Watson mtx_assert(&sem_lock, MA_OWNED); 170efaa6588SAlfred Perlstein LIST_FOREACH(ks, &ksem_head, ks_entry) 171efaa6588SAlfred Perlstein if (ks->ks_name != NULL && strcmp(ks->ks_name, name) == 0) 172efaa6588SAlfred Perlstein return (ks); 173efaa6588SAlfred Perlstein return (NULL); 174efaa6588SAlfred Perlstein } 175efaa6588SAlfred Perlstein 176c3053131SPoul-Henning Kamp static int 177c1250af6SRobert Watson sem_create(struct thread *td, const char *name, struct ksem **ksret, 178c1250af6SRobert Watson mode_t mode, unsigned int value) 179efaa6588SAlfred Perlstein { 180efaa6588SAlfred Perlstein struct ksem *ret; 181efaa6588SAlfred Perlstein struct proc *p; 182efaa6588SAlfred Perlstein struct ucred *uc; 183efaa6588SAlfred Perlstein size_t len; 184efaa6588SAlfred Perlstein int error; 185efaa6588SAlfred Perlstein 186c814aa3fSAlfred Perlstein DP(("sem_create\n")); 187efaa6588SAlfred Perlstein p = td->td_proc; 188b2546660SJohn Baldwin uc = td->td_ucred; 189efaa6588SAlfred Perlstein if (value > SEM_VALUE_MAX) 190efaa6588SAlfred Perlstein return (EINVAL); 191a163d034SWarner Losh ret = malloc(sizeof(*ret), M_SEM, M_WAITOK | M_ZERO); 192efaa6588SAlfred Perlstein if (name != NULL) { 193efaa6588SAlfred Perlstein len = strlen(name); 194efaa6588SAlfred Perlstein if (len > SEM_MAX_NAMELEN) { 195efaa6588SAlfred Perlstein free(ret, M_SEM); 196efaa6588SAlfred Perlstein return (ENAMETOOLONG); 197efaa6588SAlfred Perlstein } 198efaa6588SAlfred Perlstein /* name must start with a '/' but not contain one. */ 199efaa6588SAlfred Perlstein if (*name != '/' || len < 2 || index(name + 1, '/') != NULL) { 200efaa6588SAlfred Perlstein free(ret, M_SEM); 201efaa6588SAlfred Perlstein return (EINVAL); 202efaa6588SAlfred Perlstein } 203a163d034SWarner Losh ret->ks_name = malloc(len + 1, M_SEM, M_WAITOK); 204efaa6588SAlfred Perlstein strcpy(ret->ks_name, name); 205efaa6588SAlfred Perlstein } else { 206efaa6588SAlfred Perlstein ret->ks_name = NULL; 207efaa6588SAlfred Perlstein } 208efaa6588SAlfred Perlstein ret->ks_mode = mode; 209efaa6588SAlfred Perlstein ret->ks_value = value; 210efaa6588SAlfred Perlstein ret->ks_ref = 1; 211efaa6588SAlfred Perlstein ret->ks_waiters = 0; 212efaa6588SAlfred Perlstein ret->ks_uid = uc->cr_uid; 213efaa6588SAlfred Perlstein ret->ks_gid = uc->cr_gid; 214efaa6588SAlfred Perlstein ret->ks_onlist = 0; 215efaa6588SAlfred Perlstein cv_init(&ret->ks_cv, "sem"); 216efaa6588SAlfred Perlstein LIST_INIT(&ret->ks_users); 21752648411SRobert Watson #ifdef MAC 21852648411SRobert Watson mac_init_posix_sem(ret); 21952648411SRobert Watson mac_create_posix_sem(uc, ret); 22052648411SRobert Watson #endif 221efaa6588SAlfred Perlstein if (name != NULL) 222efaa6588SAlfred Perlstein sem_enter(td->td_proc, ret); 223efaa6588SAlfred Perlstein *ksret = ret; 224efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 225efaa6588SAlfred Perlstein if (nsems >= p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX)) { 226efaa6588SAlfred Perlstein sem_leave(td->td_proc, ret); 227efaa6588SAlfred Perlstein sem_free(ret); 228efaa6588SAlfred Perlstein error = ENFILE; 229efaa6588SAlfred Perlstein } else { 230efaa6588SAlfred Perlstein nsems++; 231efaa6588SAlfred Perlstein error = 0; 232efaa6588SAlfred Perlstein } 233efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 234efaa6588SAlfred Perlstein return (error); 235efaa6588SAlfred Perlstein } 236efaa6588SAlfred Perlstein 237efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 238efaa6588SAlfred Perlstein struct ksem_init_args { 239efaa6588SAlfred Perlstein unsigned int value; 240efaa6588SAlfred Perlstein semid_t *idp; 241efaa6588SAlfred Perlstein }; 242efaa6588SAlfred Perlstein int ksem_init(struct thread *td, struct ksem_init_args *uap); 243efaa6588SAlfred Perlstein #endif 244efaa6588SAlfred Perlstein int 245c1250af6SRobert Watson ksem_init(struct thread *td, struct ksem_init_args *uap) 246efaa6588SAlfred Perlstein { 247efaa6588SAlfred Perlstein int error; 248efaa6588SAlfred Perlstein 249efaa6588SAlfred Perlstein error = kern_sem_init(td, UIO_USERSPACE, uap->value, uap->idp); 250efaa6588SAlfred Perlstein return (error); 251efaa6588SAlfred Perlstein } 252efaa6588SAlfred Perlstein 253efaa6588SAlfred Perlstein static int 254c1250af6SRobert Watson kern_sem_init(struct thread *td, int dir, unsigned int value, semid_t *idp) 255efaa6588SAlfred Perlstein { 256efaa6588SAlfred Perlstein struct ksem *ks; 257efaa6588SAlfred Perlstein semid_t id; 258efaa6588SAlfred Perlstein int error; 259efaa6588SAlfred Perlstein 260efaa6588SAlfred Perlstein error = sem_create(td, NULL, &ks, S_IRWXU | S_IRWXG, value); 261efaa6588SAlfred Perlstein if (error) 262efaa6588SAlfred Perlstein return (error); 263efaa6588SAlfred Perlstein id = SEM_TO_ID(ks); 264efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 265efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 266efaa6588SAlfred Perlstein if (error) { 267efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 268efaa6588SAlfred Perlstein sem_rel(ks); 269efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 270efaa6588SAlfred Perlstein return (error); 271efaa6588SAlfred Perlstein } 272efaa6588SAlfred Perlstein } else { 273efaa6588SAlfred Perlstein *idp = id; 274efaa6588SAlfred Perlstein } 275efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 276efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_head, ks, ks_entry); 277efaa6588SAlfred Perlstein ks->ks_onlist = 1; 278efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 279efaa6588SAlfred Perlstein return (error); 280efaa6588SAlfred Perlstein } 281efaa6588SAlfred Perlstein 282efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 283efaa6588SAlfred Perlstein struct ksem_open_args { 284efaa6588SAlfred Perlstein char *name; 285efaa6588SAlfred Perlstein int oflag; 286efaa6588SAlfred Perlstein mode_t mode; 287efaa6588SAlfred Perlstein unsigned int value; 288efaa6588SAlfred Perlstein semid_t *idp; 289efaa6588SAlfred Perlstein }; 290efaa6588SAlfred Perlstein int ksem_open(struct thread *td, struct ksem_open_args *uap); 291efaa6588SAlfred Perlstein #endif 292efaa6588SAlfred Perlstein int 293c1250af6SRobert Watson ksem_open(struct thread *td, struct ksem_open_args *uap) 294efaa6588SAlfred Perlstein { 295efaa6588SAlfred Perlstein char name[SEM_MAX_NAMELEN + 1]; 296efaa6588SAlfred Perlstein size_t done; 297efaa6588SAlfred Perlstein int error; 298efaa6588SAlfred Perlstein 299efaa6588SAlfred Perlstein error = copyinstr(uap->name, name, SEM_MAX_NAMELEN + 1, &done); 300efaa6588SAlfred Perlstein if (error) 301efaa6588SAlfred Perlstein return (error); 302c814aa3fSAlfred Perlstein DP((">>> sem_open start\n")); 303efaa6588SAlfred Perlstein error = kern_sem_open(td, UIO_USERSPACE, 304efaa6588SAlfred Perlstein name, uap->oflag, uap->mode, uap->value, uap->idp); 305c814aa3fSAlfred Perlstein DP(("<<< sem_open end\n")); 306efaa6588SAlfred Perlstein return (error); 307efaa6588SAlfred Perlstein } 308efaa6588SAlfred Perlstein 309efaa6588SAlfred Perlstein static int 310c1250af6SRobert Watson kern_sem_open(struct thread *td, int dir, const char *name, int oflag, 311c1250af6SRobert Watson mode_t mode, unsigned int value, semid_t *idp) 312efaa6588SAlfred Perlstein { 313efaa6588SAlfred Perlstein struct ksem *ksnew, *ks; 314efaa6588SAlfred Perlstein int error; 315efaa6588SAlfred Perlstein semid_t id; 316efaa6588SAlfred Perlstein 317efaa6588SAlfred Perlstein ksnew = NULL; 318efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 319efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 320efaa6588SAlfred Perlstein /* 321efaa6588SAlfred Perlstein * If we found it but O_EXCL is set, error. 322efaa6588SAlfred Perlstein */ 323efaa6588SAlfred Perlstein if (ks != NULL && (oflag & O_EXCL) != 0) { 324efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 325efaa6588SAlfred Perlstein return (EEXIST); 326efaa6588SAlfred Perlstein } 327efaa6588SAlfred Perlstein /* 328efaa6588SAlfred Perlstein * If we didn't find it... 329efaa6588SAlfred Perlstein */ 330efaa6588SAlfred Perlstein if (ks == NULL) { 331efaa6588SAlfred Perlstein /* 332efaa6588SAlfred Perlstein * didn't ask for creation? error. 333efaa6588SAlfred Perlstein */ 334efaa6588SAlfred Perlstein if ((oflag & O_CREAT) == 0) { 335efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 336efaa6588SAlfred Perlstein return (ENOENT); 337efaa6588SAlfred Perlstein } 338efaa6588SAlfred Perlstein /* 339efaa6588SAlfred Perlstein * We may block during creation, so drop the lock. 340efaa6588SAlfred Perlstein */ 341efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 342efaa6588SAlfred Perlstein error = sem_create(td, name, &ksnew, mode, value); 343efaa6588SAlfred Perlstein if (error != 0) 344efaa6588SAlfred Perlstein return (error); 345efaa6588SAlfred Perlstein id = SEM_TO_ID(ksnew); 346efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 347c814aa3fSAlfred Perlstein DP(("about to copyout! %d to %p\n", id, idp)); 348efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 349efaa6588SAlfred Perlstein if (error) { 350efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 351efaa6588SAlfred Perlstein sem_leave(td->td_proc, ksnew); 352efaa6588SAlfred Perlstein sem_rel(ksnew); 353efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 354efaa6588SAlfred Perlstein return (error); 355efaa6588SAlfred Perlstein } 356efaa6588SAlfred Perlstein } else { 357c814aa3fSAlfred Perlstein DP(("about to set! %d to %p\n", id, idp)); 358efaa6588SAlfred Perlstein *idp = id; 359efaa6588SAlfred Perlstein } 360efaa6588SAlfred Perlstein /* 361efaa6588SAlfred Perlstein * We need to make sure we haven't lost a race while 362efaa6588SAlfred Perlstein * allocating during creation. 363efaa6588SAlfred Perlstein */ 364efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 365efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 366efaa6588SAlfred Perlstein if (ks != NULL) { 367efaa6588SAlfred Perlstein /* we lost... */ 368efaa6588SAlfred Perlstein sem_leave(td->td_proc, ksnew); 369efaa6588SAlfred Perlstein sem_rel(ksnew); 370efaa6588SAlfred Perlstein /* we lost and we can't loose... */ 371efaa6588SAlfred Perlstein if ((oflag & O_EXCL) != 0) { 372efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 373efaa6588SAlfred Perlstein return (EEXIST); 374efaa6588SAlfred Perlstein } 375efaa6588SAlfred Perlstein } else { 376c814aa3fSAlfred Perlstein DP(("sem_create: about to add to list...\n")); 377efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_head, ksnew, ks_entry); 378c814aa3fSAlfred Perlstein DP(("sem_create: setting list bit...\n")); 379efaa6588SAlfred Perlstein ksnew->ks_onlist = 1; 380c814aa3fSAlfred Perlstein DP(("sem_create: done, about to unlock...\n")); 381efaa6588SAlfred Perlstein } 382efaa6588SAlfred Perlstein } else { 38352648411SRobert Watson #ifdef MAC 38452648411SRobert Watson error = mac_check_posix_sem_open(td->td_ucred, ks); 38552648411SRobert Watson if (error) 38652648411SRobert Watson goto err_open; 38752648411SRobert Watson #endif 388efaa6588SAlfred Perlstein /* 389efaa6588SAlfred Perlstein * if we aren't the creator, then enforce permissions. 390efaa6588SAlfred Perlstein */ 391b2546660SJohn Baldwin error = sem_perm(td, ks); 39252648411SRobert Watson if (error) 39352648411SRobert Watson goto err_open; 394efaa6588SAlfred Perlstein sem_ref(ks); 395efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 396efaa6588SAlfred Perlstein id = SEM_TO_ID(ks); 397efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 398efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 399efaa6588SAlfred Perlstein if (error) { 400efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 401efaa6588SAlfred Perlstein sem_rel(ks); 402efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 403efaa6588SAlfred Perlstein return (error); 404efaa6588SAlfred Perlstein } 405efaa6588SAlfred Perlstein } else { 406efaa6588SAlfred Perlstein *idp = id; 407efaa6588SAlfred Perlstein } 408efaa6588SAlfred Perlstein sem_enter(td->td_proc, ks); 409efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 410efaa6588SAlfred Perlstein sem_rel(ks); 411efaa6588SAlfred Perlstein } 41252648411SRobert Watson err_open: 41352648411SRobert Watson mtx_unlock(&sem_lock); 414efaa6588SAlfred Perlstein return (error); 415efaa6588SAlfred Perlstein } 416efaa6588SAlfred Perlstein 417c3053131SPoul-Henning Kamp static int 418c1250af6SRobert Watson sem_perm(struct thread *td, struct ksem *ks) 419efaa6588SAlfred Perlstein { 420efaa6588SAlfred Perlstein struct ucred *uc; 421efaa6588SAlfred Perlstein 422acd3428bSRobert Watson /* 423acd3428bSRobert Watson * XXXRW: This permission routine appears to be incorrect. If the 424acd3428bSRobert Watson * user matches, we shouldn't go on to the group if the user 425acd3428bSRobert Watson * permissions don't allow the action? Not changed for now. To fix, 426acd3428bSRobert Watson * change from a series of if (); if (); to if () else if () else... 427acd3428bSRobert Watson */ 428b2546660SJohn Baldwin uc = td->td_ucred; 429c814aa3fSAlfred Perlstein DP(("sem_perm: uc(%d,%d) ks(%d,%d,%o)\n", 430efaa6588SAlfred Perlstein uc->cr_uid, uc->cr_gid, 431c814aa3fSAlfred Perlstein ks->ks_uid, ks->ks_gid, ks->ks_mode)); 432acd3428bSRobert Watson if ((uc->cr_uid == ks->ks_uid) && (ks->ks_mode & S_IWUSR) != 0) 433efaa6588SAlfred Perlstein return (0); 434acd3428bSRobert Watson if ((uc->cr_gid == ks->ks_gid) && (ks->ks_mode & S_IWGRP) != 0) 435acd3428bSRobert Watson return (0); 436acd3428bSRobert Watson if ((ks->ks_mode & S_IWOTH) != 0) 437acd3428bSRobert Watson return (0); 438acd3428bSRobert Watson return (priv_check(td, PRIV_SEM_WRITE)); 439efaa6588SAlfred Perlstein } 440efaa6588SAlfred Perlstein 441c3053131SPoul-Henning Kamp static void 442efaa6588SAlfred Perlstein sem_free(struct ksem *ks) 443efaa6588SAlfred Perlstein { 444efaa6588SAlfred Perlstein 445efaa6588SAlfred Perlstein nsems--; 446efaa6588SAlfred Perlstein if (ks->ks_onlist) 447efaa6588SAlfred Perlstein LIST_REMOVE(ks, ks_entry); 448efaa6588SAlfred Perlstein if (ks->ks_name != NULL) 449efaa6588SAlfred Perlstein free(ks->ks_name, M_SEM); 450efaa6588SAlfred Perlstein cv_destroy(&ks->ks_cv); 451efaa6588SAlfred Perlstein free(ks, M_SEM); 452efaa6588SAlfred Perlstein } 453efaa6588SAlfred Perlstein 454efaa6588SAlfred Perlstein static __inline struct kuser *sem_getuser(struct proc *p, struct ksem *ks); 455efaa6588SAlfred Perlstein 456efaa6588SAlfred Perlstein static __inline struct kuser * 457c1250af6SRobert Watson sem_getuser(struct proc *p, struct ksem *ks) 458efaa6588SAlfred Perlstein { 459efaa6588SAlfred Perlstein struct kuser *k; 460efaa6588SAlfred Perlstein 461efaa6588SAlfred Perlstein LIST_FOREACH(k, &ks->ks_users, ku_next) 462efaa6588SAlfred Perlstein if (k->ku_pid == p->p_pid) 463efaa6588SAlfred Perlstein return (k); 464efaa6588SAlfred Perlstein return (NULL); 465efaa6588SAlfred Perlstein } 466efaa6588SAlfred Perlstein 467c3053131SPoul-Henning Kamp static int 468c1250af6SRobert Watson sem_hasopen(struct thread *td, struct ksem *ks) 469efaa6588SAlfred Perlstein { 470efaa6588SAlfred Perlstein 471aae94fbbSDaniel Eischen return ((ks->ks_name == NULL && sem_perm(td, ks) == 0) 472b2546660SJohn Baldwin || sem_getuser(td->td_proc, ks) != NULL); 473efaa6588SAlfred Perlstein } 474efaa6588SAlfred Perlstein 475c3053131SPoul-Henning Kamp static int 476c1250af6SRobert Watson sem_leave(struct proc *p, struct ksem *ks) 477efaa6588SAlfred Perlstein { 478efaa6588SAlfred Perlstein struct kuser *k; 479efaa6588SAlfred Perlstein 480c814aa3fSAlfred Perlstein DP(("sem_leave: ks = %p\n", ks)); 481efaa6588SAlfred Perlstein k = sem_getuser(p, ks); 482c814aa3fSAlfred Perlstein DP(("sem_leave: ks = %p, k = %p\n", ks, k)); 483efaa6588SAlfred Perlstein if (k != NULL) { 484efaa6588SAlfred Perlstein LIST_REMOVE(k, ku_next); 485efaa6588SAlfred Perlstein sem_rel(ks); 486c814aa3fSAlfred Perlstein DP(("sem_leave: about to free k\n")); 487efaa6588SAlfred Perlstein free(k, M_SEM); 488c814aa3fSAlfred Perlstein DP(("sem_leave: returning\n")); 489efaa6588SAlfred Perlstein return (0); 490efaa6588SAlfred Perlstein } 491b3890a1cSAlfred Perlstein return (EINVAL); 492efaa6588SAlfred Perlstein } 493efaa6588SAlfred Perlstein 494c3053131SPoul-Henning Kamp static void 495efaa6588SAlfred Perlstein sem_enter(p, ks) 496efaa6588SAlfred Perlstein struct proc *p; 497efaa6588SAlfred Perlstein struct ksem *ks; 498efaa6588SAlfred Perlstein { 499efaa6588SAlfred Perlstein struct kuser *ku, *k; 500efaa6588SAlfred Perlstein 501a163d034SWarner Losh ku = malloc(sizeof(*ku), M_SEM, M_WAITOK); 502efaa6588SAlfred Perlstein ku->ku_pid = p->p_pid; 503efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 504efaa6588SAlfred Perlstein k = sem_getuser(p, ks); 505efaa6588SAlfred Perlstein if (k != NULL) { 506efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 507efaa6588SAlfred Perlstein free(ku, M_TEMP); 508efaa6588SAlfred Perlstein return; 509efaa6588SAlfred Perlstein } 510efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ks->ks_users, ku, ku_next); 511efaa6588SAlfred Perlstein sem_ref(ks); 512efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 513efaa6588SAlfred Perlstein } 514efaa6588SAlfred Perlstein 515efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 516efaa6588SAlfred Perlstein struct ksem_unlink_args { 517efaa6588SAlfred Perlstein char *name; 518efaa6588SAlfred Perlstein }; 519efaa6588SAlfred Perlstein int ksem_unlink(struct thread *td, struct ksem_unlink_args *uap); 520efaa6588SAlfred Perlstein #endif 521efaa6588SAlfred Perlstein 522efaa6588SAlfred Perlstein int 523c1250af6SRobert Watson ksem_unlink(struct thread *td, struct ksem_unlink_args *uap) 524efaa6588SAlfred Perlstein { 525efaa6588SAlfred Perlstein char name[SEM_MAX_NAMELEN + 1]; 526efaa6588SAlfred Perlstein size_t done; 527efaa6588SAlfred Perlstein int error; 528efaa6588SAlfred Perlstein 529efaa6588SAlfred Perlstein error = copyinstr(uap->name, name, SEM_MAX_NAMELEN + 1, &done); 530efaa6588SAlfred Perlstein return (error ? error : 531efaa6588SAlfred Perlstein kern_sem_unlink(td, name)); 532efaa6588SAlfred Perlstein } 533efaa6588SAlfred Perlstein 534efaa6588SAlfred Perlstein static int 535c1250af6SRobert Watson kern_sem_unlink(struct thread *td, const char *name) 536efaa6588SAlfred Perlstein { 537efaa6588SAlfred Perlstein struct ksem *ks; 538efaa6588SAlfred Perlstein int error; 539efaa6588SAlfred Perlstein 540efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 541efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 54252648411SRobert Watson if (ks != NULL) { 54352648411SRobert Watson #ifdef MAC 54452648411SRobert Watson error = mac_check_posix_sem_unlink(td->td_ucred, ks); 54552648411SRobert Watson if (error) { 54652648411SRobert Watson mtx_unlock(&sem_lock); 54752648411SRobert Watson return (error); 54852648411SRobert Watson } 54952648411SRobert Watson #endif 550b2546660SJohn Baldwin error = sem_perm(td, ks); 55152648411SRobert Watson } else 55252648411SRobert Watson error = ENOENT; 553c814aa3fSAlfred Perlstein DP(("sem_unlink: '%s' ks = %p, error = %d\n", name, ks, error)); 554efaa6588SAlfred Perlstein if (error == 0) { 555efaa6588SAlfred Perlstein LIST_REMOVE(ks, ks_entry); 556efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_deadhead, ks, ks_entry); 557efaa6588SAlfred Perlstein sem_rel(ks); 558efaa6588SAlfred Perlstein } 559efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 560efaa6588SAlfred Perlstein return (error); 561efaa6588SAlfred Perlstein } 562efaa6588SAlfred Perlstein 563efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 564efaa6588SAlfred Perlstein struct ksem_close_args { 565efaa6588SAlfred Perlstein semid_t id; 566efaa6588SAlfred Perlstein }; 567efaa6588SAlfred Perlstein int ksem_close(struct thread *td, struct ksem_close_args *uap); 568efaa6588SAlfred Perlstein #endif 569efaa6588SAlfred Perlstein 570efaa6588SAlfred Perlstein int 571efaa6588SAlfred Perlstein ksem_close(struct thread *td, struct ksem_close_args *uap) 572efaa6588SAlfred Perlstein { 573efaa6588SAlfred Perlstein 574efaa6588SAlfred Perlstein return (kern_sem_close(td, uap->id)); 575efaa6588SAlfred Perlstein } 576efaa6588SAlfred Perlstein 577c3053131SPoul-Henning Kamp static int 578c1250af6SRobert Watson kern_sem_close(struct thread *td, semid_t id) 579efaa6588SAlfred Perlstein { 580efaa6588SAlfred Perlstein struct ksem *ks; 581efaa6588SAlfred Perlstein int error; 582efaa6588SAlfred Perlstein 583efaa6588SAlfred Perlstein error = EINVAL; 584efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 585efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 586efaa6588SAlfred Perlstein /* this is not a valid operation for unnamed sems */ 587efaa6588SAlfred Perlstein if (ks != NULL && ks->ks_name != NULL) 588b3890a1cSAlfred Perlstein error = sem_leave(td->td_proc, ks); 589efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 590b3890a1cSAlfred Perlstein return (error); 591efaa6588SAlfred Perlstein } 592efaa6588SAlfred Perlstein 593efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 594efaa6588SAlfred Perlstein struct ksem_post_args { 595efaa6588SAlfred Perlstein semid_t id; 596efaa6588SAlfred Perlstein }; 597efaa6588SAlfred Perlstein int ksem_post(struct thread *td, struct ksem_post_args *uap); 598efaa6588SAlfred Perlstein #endif 599efaa6588SAlfred Perlstein int 600c1250af6SRobert Watson ksem_post(struct thread *td, struct ksem_post_args *uap) 601efaa6588SAlfred Perlstein { 602efaa6588SAlfred Perlstein 603efaa6588SAlfred Perlstein return (kern_sem_post(td, uap->id)); 604efaa6588SAlfred Perlstein } 605efaa6588SAlfred Perlstein 606c3053131SPoul-Henning Kamp static int 607c1250af6SRobert Watson kern_sem_post(struct thread *td, semid_t id) 608efaa6588SAlfred Perlstein { 609efaa6588SAlfred Perlstein struct ksem *ks; 610efaa6588SAlfred Perlstein int error; 611efaa6588SAlfred Perlstein 612efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 613efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 614b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks)) { 615efaa6588SAlfred Perlstein error = EINVAL; 616efaa6588SAlfred Perlstein goto err; 617efaa6588SAlfred Perlstein } 61852648411SRobert Watson #ifdef MAC 61952648411SRobert Watson error = mac_check_posix_sem_post(td->td_ucred, ks); 62052648411SRobert Watson if (error) 62152648411SRobert Watson goto err; 62252648411SRobert Watson #endif 623efaa6588SAlfred Perlstein if (ks->ks_value == SEM_VALUE_MAX) { 624efaa6588SAlfred Perlstein error = EOVERFLOW; 625efaa6588SAlfred Perlstein goto err; 626efaa6588SAlfred Perlstein } 627efaa6588SAlfred Perlstein ++ks->ks_value; 628efaa6588SAlfred Perlstein if (ks->ks_waiters > 0) 629efaa6588SAlfred Perlstein cv_signal(&ks->ks_cv); 630efaa6588SAlfred Perlstein error = 0; 631efaa6588SAlfred Perlstein err: 632efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 633efaa6588SAlfred Perlstein return (error); 634efaa6588SAlfred Perlstein } 635efaa6588SAlfred Perlstein 636efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 637efaa6588SAlfred Perlstein struct ksem_wait_args { 638efaa6588SAlfred Perlstein semid_t id; 639efaa6588SAlfred Perlstein }; 640efaa6588SAlfred Perlstein int ksem_wait(struct thread *td, struct ksem_wait_args *uap); 641efaa6588SAlfred Perlstein #endif 642efaa6588SAlfred Perlstein 643efaa6588SAlfred Perlstein int 644c1250af6SRobert Watson ksem_wait(struct thread *td, struct ksem_wait_args *uap) 645efaa6588SAlfred Perlstein { 646efaa6588SAlfred Perlstein 647aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, NULL)); 648aae94fbbSDaniel Eischen } 649aae94fbbSDaniel Eischen 650aae94fbbSDaniel Eischen #ifndef _SYS_SYSPROTO_H_ 651aae94fbbSDaniel Eischen struct ksem_timedwait_args { 652aae94fbbSDaniel Eischen semid_t id; 653d60e86c8SStefan Farfeleder const struct timespec *abstime; 654aae94fbbSDaniel Eischen }; 655aae94fbbSDaniel Eischen int ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap); 656aae94fbbSDaniel Eischen #endif 657aae94fbbSDaniel Eischen int 658c1250af6SRobert Watson ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap) 659aae94fbbSDaniel Eischen { 660aae94fbbSDaniel Eischen struct timespec abstime; 661aae94fbbSDaniel Eischen struct timespec *ts; 662aae94fbbSDaniel Eischen int error; 663aae94fbbSDaniel Eischen 664aae94fbbSDaniel Eischen /* We allow a null timespec (wait forever). */ 665aae94fbbSDaniel Eischen if (uap->abstime == NULL) 666aae94fbbSDaniel Eischen ts = NULL; 667aae94fbbSDaniel Eischen else { 668aae94fbbSDaniel Eischen error = copyin(uap->abstime, &abstime, sizeof(abstime)); 669aae94fbbSDaniel Eischen if (error != 0) 670aae94fbbSDaniel Eischen return (error); 671aae94fbbSDaniel Eischen if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 672aae94fbbSDaniel Eischen return (EINVAL); 673aae94fbbSDaniel Eischen ts = &abstime; 674aae94fbbSDaniel Eischen } 675aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, ts)); 676efaa6588SAlfred Perlstein } 677efaa6588SAlfred Perlstein 678efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 679efaa6588SAlfred Perlstein struct ksem_trywait_args { 680efaa6588SAlfred Perlstein semid_t id; 681efaa6588SAlfred Perlstein }; 682efaa6588SAlfred Perlstein int ksem_trywait(struct thread *td, struct ksem_trywait_args *uap); 683efaa6588SAlfred Perlstein #endif 684efaa6588SAlfred Perlstein int 685c1250af6SRobert Watson ksem_trywait(struct thread *td, struct ksem_trywait_args *uap) 686efaa6588SAlfred Perlstein { 687efaa6588SAlfred Perlstein 688aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 1, NULL)); 689efaa6588SAlfred Perlstein } 690efaa6588SAlfred Perlstein 691c3053131SPoul-Henning Kamp static int 692c1250af6SRobert Watson kern_sem_wait(struct thread *td, semid_t id, int tryflag, 693c1250af6SRobert Watson struct timespec *abstime) 694efaa6588SAlfred Perlstein { 695aae94fbbSDaniel Eischen struct timespec ts1, ts2; 696aae94fbbSDaniel Eischen struct timeval tv; 697efaa6588SAlfred Perlstein struct ksem *ks; 698efaa6588SAlfred Perlstein int error; 699efaa6588SAlfred Perlstein 700c814aa3fSAlfred Perlstein DP((">>> kern_sem_wait entered!\n")); 701efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 702efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 703efaa6588SAlfred Perlstein if (ks == NULL) { 704c814aa3fSAlfred Perlstein DP(("kern_sem_wait ks == NULL\n")); 705efaa6588SAlfred Perlstein error = EINVAL; 706efaa6588SAlfred Perlstein goto err; 707efaa6588SAlfred Perlstein } 708efaa6588SAlfred Perlstein sem_ref(ks); 709b2546660SJohn Baldwin if (!sem_hasopen(td, ks)) { 710c814aa3fSAlfred Perlstein DP(("kern_sem_wait hasopen failed\n")); 711efaa6588SAlfred Perlstein error = EINVAL; 712efaa6588SAlfred Perlstein goto err; 713efaa6588SAlfred Perlstein } 71452648411SRobert Watson #ifdef MAC 71552648411SRobert Watson error = mac_check_posix_sem_wait(td->td_ucred, ks); 71652648411SRobert Watson if (error) { 71752648411SRobert Watson DP(("kern_sem_wait mac failed\n")); 71852648411SRobert Watson goto err; 71952648411SRobert Watson } 72052648411SRobert Watson #endif 721c814aa3fSAlfred Perlstein DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); 722efaa6588SAlfred Perlstein if (ks->ks_value == 0) { 723efaa6588SAlfred Perlstein ks->ks_waiters++; 724aae94fbbSDaniel Eischen if (tryflag != 0) 725aae94fbbSDaniel Eischen error = EAGAIN; 726aae94fbbSDaniel Eischen else if (abstime == NULL) 727aae94fbbSDaniel Eischen error = cv_wait_sig(&ks->ks_cv, &sem_lock); 728aae94fbbSDaniel Eischen else { 729aae94fbbSDaniel Eischen for (;;) { 730aae94fbbSDaniel Eischen ts1 = *abstime; 731aae94fbbSDaniel Eischen getnanotime(&ts2); 732aae94fbbSDaniel Eischen timespecsub(&ts1, &ts2); 733aae94fbbSDaniel Eischen TIMESPEC_TO_TIMEVAL(&tv, &ts1); 734aae94fbbSDaniel Eischen if (tv.tv_sec < 0) { 735aae94fbbSDaniel Eischen error = ETIMEDOUT; 736aae94fbbSDaniel Eischen break; 737aae94fbbSDaniel Eischen } 738aae94fbbSDaniel Eischen error = cv_timedwait_sig(&ks->ks_cv, 739aae94fbbSDaniel Eischen &sem_lock, tvtohz(&tv)); 740aae94fbbSDaniel Eischen if (error != EWOULDBLOCK) 741aae94fbbSDaniel Eischen break; 742aae94fbbSDaniel Eischen } 743aae94fbbSDaniel Eischen } 744efaa6588SAlfred Perlstein ks->ks_waiters--; 745efaa6588SAlfred Perlstein if (error) 746efaa6588SAlfred Perlstein goto err; 747efaa6588SAlfred Perlstein } 748efaa6588SAlfred Perlstein ks->ks_value--; 749efaa6588SAlfred Perlstein error = 0; 750efaa6588SAlfred Perlstein err: 751efaa6588SAlfred Perlstein if (ks != NULL) 752efaa6588SAlfred Perlstein sem_rel(ks); 753efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 754c814aa3fSAlfred Perlstein DP(("<<< kern_sem_wait leaving, error = %d\n", error)); 755efaa6588SAlfred Perlstein return (error); 756efaa6588SAlfred Perlstein } 757efaa6588SAlfred Perlstein 758efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 759efaa6588SAlfred Perlstein struct ksem_getvalue_args { 760efaa6588SAlfred Perlstein semid_t id; 761efaa6588SAlfred Perlstein int *val; 762efaa6588SAlfred Perlstein }; 763efaa6588SAlfred Perlstein int ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap); 764efaa6588SAlfred Perlstein #endif 765efaa6588SAlfred Perlstein int 766c1250af6SRobert Watson ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap) 767efaa6588SAlfred Perlstein { 768efaa6588SAlfred Perlstein struct ksem *ks; 769efaa6588SAlfred Perlstein int error, val; 770efaa6588SAlfred Perlstein 771efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 772efaa6588SAlfred Perlstein ks = ID_TO_SEM(uap->id); 773b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks)) { 774efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 775efaa6588SAlfred Perlstein return (EINVAL); 776efaa6588SAlfred Perlstein } 77752648411SRobert Watson #ifdef MAC 77852648411SRobert Watson error = mac_check_posix_sem_getvalue(td->td_ucred, ks); 77952648411SRobert Watson if (error) { 78052648411SRobert Watson mtx_unlock(&sem_lock); 78152648411SRobert Watson return (error); 78252648411SRobert Watson } 78352648411SRobert Watson #endif 784efaa6588SAlfred Perlstein val = ks->ks_value; 785efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 786efaa6588SAlfred Perlstein error = copyout(&val, uap->val, sizeof(val)); 787efaa6588SAlfred Perlstein return (error); 788efaa6588SAlfred Perlstein } 789efaa6588SAlfred Perlstein 790efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 791efaa6588SAlfred Perlstein struct ksem_destroy_args { 792efaa6588SAlfred Perlstein semid_t id; 793efaa6588SAlfred Perlstein }; 794efaa6588SAlfred Perlstein int ksem_destroy(struct thread *td, struct ksem_destroy_args *uap); 795efaa6588SAlfred Perlstein #endif 796efaa6588SAlfred Perlstein int 797c1250af6SRobert Watson ksem_destroy(struct thread *td, struct ksem_destroy_args *uap) 798efaa6588SAlfred Perlstein { 799efaa6588SAlfred Perlstein struct ksem *ks; 800efaa6588SAlfred Perlstein int error; 801efaa6588SAlfred Perlstein 802efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 803efaa6588SAlfred Perlstein ks = ID_TO_SEM(uap->id); 804b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks) || 805efaa6588SAlfred Perlstein ks->ks_name != NULL) { 806efaa6588SAlfred Perlstein error = EINVAL; 807efaa6588SAlfred Perlstein goto err; 808efaa6588SAlfred Perlstein } 80952648411SRobert Watson #ifdef MAC 81052648411SRobert Watson error = mac_check_posix_sem_destroy(td->td_ucred, ks); 81152648411SRobert Watson if (error) 81252648411SRobert Watson goto err; 81352648411SRobert Watson #endif 814efaa6588SAlfred Perlstein if (ks->ks_waiters != 0) { 815efaa6588SAlfred Perlstein error = EBUSY; 816efaa6588SAlfred Perlstein goto err; 817efaa6588SAlfred Perlstein } 818efaa6588SAlfred Perlstein sem_rel(ks); 819efaa6588SAlfred Perlstein error = 0; 820efaa6588SAlfred Perlstein err: 821efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 822efaa6588SAlfred Perlstein return (error); 823efaa6588SAlfred Perlstein } 824efaa6588SAlfred Perlstein 825590f242cSRobert Watson /* 826590f242cSRobert Watson * Count the number of kusers associated with a proc, so as to guess at how 827590f242cSRobert Watson * many to allocate when forking. 828590f242cSRobert Watson */ 829590f242cSRobert Watson static int 830c1250af6SRobert Watson sem_count_proc(struct proc *p) 831590f242cSRobert Watson { 832590f242cSRobert Watson struct ksem *ks; 833590f242cSRobert Watson struct kuser *ku; 834590f242cSRobert Watson int count; 835590f242cSRobert Watson 836590f242cSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 837590f242cSRobert Watson 838590f242cSRobert Watson count = 0; 839590f242cSRobert Watson LIST_FOREACH(ks, &ksem_head, ks_entry) { 840590f242cSRobert Watson LIST_FOREACH(ku, &ks->ks_users, ku_next) { 841590f242cSRobert Watson if (ku->ku_pid == p->p_pid) 842590f242cSRobert Watson count++; 843590f242cSRobert Watson } 844590f242cSRobert Watson } 845590f242cSRobert Watson LIST_FOREACH(ks, &ksem_deadhead, ks_entry) { 846590f242cSRobert Watson LIST_FOREACH(ku, &ks->ks_users, ku_next) { 847590f242cSRobert Watson if (ku->ku_pid == p->p_pid) 848590f242cSRobert Watson count++; 849590f242cSRobert Watson } 850590f242cSRobert Watson } 851590f242cSRobert Watson return (count); 852590f242cSRobert Watson } 853590f242cSRobert Watson 854590f242cSRobert Watson /* 855590f242cSRobert Watson * When a process forks, the child process must gain a reference to each open 856590f242cSRobert Watson * semaphore in the parent process, whether it is unlinked or not. This 857590f242cSRobert Watson * requires allocating a kuser structure for each semaphore reference in the 858590f242cSRobert Watson * new process. Because the set of semaphores in the parent can change while 859590f242cSRobert Watson * the fork is in progress, we have to handle races -- first we attempt to 860590f242cSRobert Watson * allocate enough storage to acquire references to each of the semaphores, 861590f242cSRobert Watson * then we enter the semaphores and release the temporary references. 862590f242cSRobert Watson */ 863590f242cSRobert Watson static void 864c1250af6SRobert Watson sem_forkhook(void *arg, struct proc *p1, struct proc *p2, int flags) 865590f242cSRobert Watson { 866590f242cSRobert Watson struct ksem *ks, **sem_array; 867590f242cSRobert Watson int count, i, new_count; 868590f242cSRobert Watson struct kuser *ku; 869590f242cSRobert Watson 870590f242cSRobert Watson mtx_lock(&sem_lock); 871590f242cSRobert Watson count = sem_count_proc(p1); 872e2f7a83dSRobert Watson if (count == 0) { 873e2f7a83dSRobert Watson mtx_unlock(&sem_lock); 874e2f7a83dSRobert Watson return; 875e2f7a83dSRobert Watson } 876590f242cSRobert Watson race_lost: 877590f242cSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 878590f242cSRobert Watson mtx_unlock(&sem_lock); 879590f242cSRobert Watson sem_array = malloc(sizeof(struct ksem *) * count, M_TEMP, M_WAITOK); 880590f242cSRobert Watson mtx_lock(&sem_lock); 881590f242cSRobert Watson new_count = sem_count_proc(p1); 882590f242cSRobert Watson if (count < new_count) { 883590f242cSRobert Watson /* Lost race, repeat and allocate more storage. */ 884590f242cSRobert Watson free(sem_array, M_TEMP); 885590f242cSRobert Watson count = new_count; 886590f242cSRobert Watson goto race_lost; 887590f242cSRobert Watson } 888590f242cSRobert Watson /* 889590f242cSRobert Watson * Given an array capable of storing an adequate number of semaphore 890590f242cSRobert Watson * references, now walk the list of semaphores and acquire a new 891590f242cSRobert Watson * reference for any semaphore opened by p1. 892590f242cSRobert Watson */ 893590f242cSRobert Watson count = new_count; 894590f242cSRobert Watson i = 0; 895590f242cSRobert Watson LIST_FOREACH(ks, &ksem_head, ks_entry) { 896590f242cSRobert Watson LIST_FOREACH(ku, &ks->ks_users, ku_next) { 897590f242cSRobert Watson if (ku->ku_pid == p1->p_pid) { 898590f242cSRobert Watson sem_ref(ks); 899590f242cSRobert Watson sem_array[i] = ks; 900fa6fc5b8SRobert Watson i++; 901590f242cSRobert Watson break; 902590f242cSRobert Watson } 903590f242cSRobert Watson } 904590f242cSRobert Watson } 905590f242cSRobert Watson LIST_FOREACH(ks, &ksem_deadhead, ks_entry) { 906590f242cSRobert Watson LIST_FOREACH(ku, &ks->ks_users, ku_next) { 907590f242cSRobert Watson if (ku->ku_pid == p1->p_pid) { 908590f242cSRobert Watson sem_ref(ks); 909590f242cSRobert Watson sem_array[i] = ks; 910fa6fc5b8SRobert Watson i++; 911590f242cSRobert Watson break; 912590f242cSRobert Watson } 913590f242cSRobert Watson } 914590f242cSRobert Watson } 915590f242cSRobert Watson mtx_unlock(&sem_lock); 916fa6fc5b8SRobert Watson KASSERT(i == count, ("sem_forkhook: i != count (%d, %d)", i, count)); 917590f242cSRobert Watson /* 918590f242cSRobert Watson * Now cause p2 to enter each of the referenced semaphores, then 919590f242cSRobert Watson * release our temporary reference. This is pretty inefficient. 920590f242cSRobert Watson * Finally, free our temporary array. 921590f242cSRobert Watson */ 922590f242cSRobert Watson for (i = 0; i < count; i++) { 923590f242cSRobert Watson sem_enter(p2, sem_array[i]); 924590f242cSRobert Watson mtx_lock(&sem_lock); 925590f242cSRobert Watson sem_rel(sem_array[i]); 926590f242cSRobert Watson mtx_unlock(&sem_lock); 927590f242cSRobert Watson } 928590f242cSRobert Watson free(sem_array, M_TEMP); 929590f242cSRobert Watson } 930590f242cSRobert Watson 931c3053131SPoul-Henning Kamp static void 932e2d70dbaSColin Percival sem_exechook(void *arg, struct proc *p, struct image_params *imgp __unused) 933993182e5SAlexander Leidinger { 934e2d70dbaSColin Percival sem_exithook(arg, p); 935993182e5SAlexander Leidinger } 936993182e5SAlexander Leidinger 937993182e5SAlexander Leidinger static void 938e2d70dbaSColin Percival sem_exithook(void *arg, struct proc *p) 939efaa6588SAlfred Perlstein { 940efaa6588SAlfred Perlstein struct ksem *ks, *ksnext; 941efaa6588SAlfred Perlstein 942efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 943efaa6588SAlfred Perlstein ks = LIST_FIRST(&ksem_head); 944efaa6588SAlfred Perlstein while (ks != NULL) { 945efaa6588SAlfred Perlstein ksnext = LIST_NEXT(ks, ks_entry); 946efaa6588SAlfred Perlstein sem_leave(p, ks); 947efaa6588SAlfred Perlstein ks = ksnext; 948efaa6588SAlfred Perlstein } 949efaa6588SAlfred Perlstein ks = LIST_FIRST(&ksem_deadhead); 950efaa6588SAlfred Perlstein while (ks != NULL) { 951efaa6588SAlfred Perlstein ksnext = LIST_NEXT(ks, ks_entry); 952efaa6588SAlfred Perlstein sem_leave(p, ks); 953efaa6588SAlfred Perlstein ks = ksnext; 954efaa6588SAlfred Perlstein } 955efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 956efaa6588SAlfred Perlstein } 957efaa6588SAlfred Perlstein 958efaa6588SAlfred Perlstein static int 959efaa6588SAlfred Perlstein sem_modload(struct module *module, int cmd, void *arg) 960efaa6588SAlfred Perlstein { 961efaa6588SAlfred Perlstein int error = 0; 962efaa6588SAlfred Perlstein 963efaa6588SAlfred Perlstein switch (cmd) { 964efaa6588SAlfred Perlstein case MOD_LOAD: 965efaa6588SAlfred Perlstein mtx_init(&sem_lock, "sem", "semaphore", MTX_DEF); 966efaa6588SAlfred Perlstein p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX); 967efaa6588SAlfred Perlstein p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX); 96875b8b3b2SJohn Baldwin sem_exit_tag = EVENTHANDLER_REGISTER(process_exit, sem_exithook, 96975b8b3b2SJohn Baldwin NULL, EVENTHANDLER_PRI_ANY); 970e2d70dbaSColin Percival sem_exec_tag = EVENTHANDLER_REGISTER(process_exec, sem_exechook, 97175b8b3b2SJohn Baldwin NULL, EVENTHANDLER_PRI_ANY); 972590f242cSRobert Watson sem_fork_tag = EVENTHANDLER_REGISTER(process_fork, sem_forkhook, NULL, EVENTHANDLER_PRI_ANY); 973efaa6588SAlfred Perlstein break; 974efaa6588SAlfred Perlstein case MOD_UNLOAD: 975efaa6588SAlfred Perlstein if (nsems != 0) { 976efaa6588SAlfred Perlstein error = EOPNOTSUPP; 977efaa6588SAlfred Perlstein break; 978efaa6588SAlfred Perlstein } 97975b8b3b2SJohn Baldwin EVENTHANDLER_DEREGISTER(process_exit, sem_exit_tag); 98075b8b3b2SJohn Baldwin EVENTHANDLER_DEREGISTER(process_exec, sem_exec_tag); 981590f242cSRobert Watson EVENTHANDLER_DEREGISTER(process_fork, sem_fork_tag); 982efaa6588SAlfred Perlstein mtx_destroy(&sem_lock); 983efaa6588SAlfred Perlstein break; 984efaa6588SAlfred Perlstein case MOD_SHUTDOWN: 985efaa6588SAlfred Perlstein break; 986efaa6588SAlfred Perlstein default: 987efaa6588SAlfred Perlstein error = EINVAL; 988efaa6588SAlfred Perlstein break; 989efaa6588SAlfred Perlstein } 990efaa6588SAlfred Perlstein return (error); 991efaa6588SAlfred Perlstein } 992efaa6588SAlfred Perlstein 993efaa6588SAlfred Perlstein static moduledata_t sem_mod = { 994efaa6588SAlfred Perlstein "sem", 995efaa6588SAlfred Perlstein &sem_modload, 996efaa6588SAlfred Perlstein NULL 997efaa6588SAlfred Perlstein }; 998efaa6588SAlfred Perlstein 999efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_init); 1000efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_open); 1001efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_unlink); 1002efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_close); 1003efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_post); 1004efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_wait); 1005aae94fbbSDaniel Eischen SYSCALL_MODULE_HELPER(ksem_timedwait); 1006efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_trywait); 1007efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_getvalue); 1008efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_destroy); 1009efaa6588SAlfred Perlstein 1010efaa6588SAlfred Perlstein DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST); 1011efaa6588SAlfred Perlstein MODULE_VERSION(sem, 1); 1012