19454b2d8SWarner Losh /*- 2efaa6588SAlfred Perlstein * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org> 3efaa6588SAlfred Perlstein * All rights reserved. 4efaa6588SAlfred Perlstein * 5efaa6588SAlfred Perlstein * Redistribution and use in source and binary forms, with or without 6efaa6588SAlfred Perlstein * modification, are permitted provided that the following conditions 7efaa6588SAlfred Perlstein * are met: 8efaa6588SAlfred Perlstein * 1. Redistributions of source code must retain the above copyright 9efaa6588SAlfred Perlstein * notice, this list of conditions and the following disclaimer. 10efaa6588SAlfred Perlstein * 2. Redistributions in binary form must reproduce the above copyright 11efaa6588SAlfred Perlstein * notice, this list of conditions and the following disclaimer in the 12efaa6588SAlfred Perlstein * documentation and/or other materials provided with the distribution. 13efaa6588SAlfred Perlstein * 14efaa6588SAlfred Perlstein * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15efaa6588SAlfred Perlstein * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16efaa6588SAlfred Perlstein * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17efaa6588SAlfred Perlstein * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18efaa6588SAlfred Perlstein * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19efaa6588SAlfred Perlstein * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20efaa6588SAlfred Perlstein * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21efaa6588SAlfred Perlstein * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22efaa6588SAlfred Perlstein * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23efaa6588SAlfred Perlstein * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24efaa6588SAlfred Perlstein * SUCH DAMAGE. 25efaa6588SAlfred Perlstein */ 26efaa6588SAlfred Perlstein 27677b542eSDavid E. O'Brien #include <sys/cdefs.h> 28677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$"); 29677b542eSDavid E. O'Brien 30efaa6588SAlfred Perlstein #include "opt_posix.h" 31efaa6588SAlfred Perlstein 32efaa6588SAlfred Perlstein #include <sys/param.h> 33efaa6588SAlfred Perlstein #include <sys/systm.h> 34efaa6588SAlfred Perlstein #include <sys/sysproto.h> 3575b8b3b2SJohn Baldwin #include <sys/eventhandler.h> 36efaa6588SAlfred Perlstein #include <sys/kernel.h> 37efaa6588SAlfred Perlstein #include <sys/proc.h> 38efaa6588SAlfred Perlstein #include <sys/lock.h> 39efaa6588SAlfred Perlstein #include <sys/mutex.h> 4077409fe1SPoul-Henning Kamp #include <sys/module.h> 41efaa6588SAlfred Perlstein #include <sys/condvar.h> 42efaa6588SAlfred Perlstein #include <sys/sem.h> 43efaa6588SAlfred Perlstein #include <sys/uio.h> 44efaa6588SAlfred Perlstein #include <sys/syscall.h> 45efaa6588SAlfred Perlstein #include <sys/stat.h> 46efaa6588SAlfred Perlstein #include <sys/sysent.h> 47efaa6588SAlfred Perlstein #include <sys/sysctl.h> 48aae94fbbSDaniel Eischen #include <sys/time.h> 49efaa6588SAlfred Perlstein #include <sys/malloc.h> 50efaa6588SAlfred Perlstein #include <sys/fcntl.h> 51efaa6588SAlfred Perlstein 52efaa6588SAlfred Perlstein #include <posix4/posix4.h> 53efaa6588SAlfred Perlstein #include <posix4/semaphore.h> 54efaa6588SAlfred Perlstein #include <posix4/_semaphore.h> 55efaa6588SAlfred Perlstein 56efaa6588SAlfred Perlstein static struct ksem *sem_lookup_byname(const char *name); 57efaa6588SAlfred Perlstein static int sem_create(struct thread *td, const char *name, 58efaa6588SAlfred Perlstein struct ksem **ksret, mode_t mode, unsigned int value); 59efaa6588SAlfred Perlstein static void sem_free(struct ksem *ksnew); 60b2546660SJohn Baldwin static int sem_perm(struct thread *td, struct ksem *ks); 61efaa6588SAlfred Perlstein static void sem_enter(struct proc *p, struct ksem *ks); 62efaa6588SAlfred Perlstein static int sem_leave(struct proc *p, struct ksem *ks); 6375b8b3b2SJohn Baldwin static void sem_exithook(void *arg, struct proc *p); 64b2546660SJohn Baldwin static int sem_hasopen(struct thread *td, struct ksem *ks); 65efaa6588SAlfred Perlstein 66efaa6588SAlfred Perlstein static int kern_sem_close(struct thread *td, semid_t id); 67efaa6588SAlfred Perlstein static int kern_sem_post(struct thread *td, semid_t id); 68aae94fbbSDaniel Eischen static int kern_sem_wait(struct thread *td, semid_t id, int tryflag, 69aae94fbbSDaniel Eischen struct timespec *abstime); 70efaa6588SAlfred Perlstein static int kern_sem_init(struct thread *td, int dir, unsigned int value, 71efaa6588SAlfred Perlstein semid_t *idp); 72efaa6588SAlfred Perlstein static int kern_sem_open(struct thread *td, int dir, const char *name, 73efaa6588SAlfred Perlstein int oflag, mode_t mode, unsigned int value, semid_t *idp); 74efaa6588SAlfred Perlstein static int kern_sem_unlink(struct thread *td, const char *name); 75efaa6588SAlfred Perlstein 76efaa6588SAlfred Perlstein #ifndef SEM_MAX 77efaa6588SAlfred Perlstein #define SEM_MAX 30 78efaa6588SAlfred Perlstein #endif 79efaa6588SAlfred Perlstein 80efaa6588SAlfred Perlstein #define SEM_MAX_NAMELEN 14 81efaa6588SAlfred Perlstein 82efaa6588SAlfred Perlstein #define SEM_TO_ID(x) ((intptr_t)(x)) 83efaa6588SAlfred Perlstein #define ID_TO_SEM(x) id_to_sem(x) 84efaa6588SAlfred Perlstein 85efaa6588SAlfred Perlstein struct kuser { 86efaa6588SAlfred Perlstein pid_t ku_pid; 87efaa6588SAlfred Perlstein LIST_ENTRY(kuser) ku_next; 88efaa6588SAlfred Perlstein }; 89efaa6588SAlfred Perlstein 90efaa6588SAlfred Perlstein struct ksem { 91efaa6588SAlfred Perlstein LIST_ENTRY(ksem) ks_entry; /* global list entry */ 92efaa6588SAlfred Perlstein int ks_onlist; /* boolean if on a list (ks_entry) */ 93efaa6588SAlfred Perlstein char *ks_name; /* if named, this is the name */ 94efaa6588SAlfred Perlstein int ks_ref; /* number of references */ 95efaa6588SAlfred Perlstein mode_t ks_mode; /* protection bits */ 96efaa6588SAlfred Perlstein uid_t ks_uid; /* creator uid */ 97efaa6588SAlfred Perlstein gid_t ks_gid; /* creator gid */ 98efaa6588SAlfred Perlstein unsigned int ks_value; /* current value */ 99efaa6588SAlfred Perlstein struct cv ks_cv; /* waiters sleep here */ 100efaa6588SAlfred Perlstein int ks_waiters; /* number of waiters */ 101efaa6588SAlfred Perlstein LIST_HEAD(, kuser) ks_users; /* pids using this sem */ 102efaa6588SAlfred Perlstein }; 103efaa6588SAlfred Perlstein 104efaa6588SAlfred Perlstein /* 105efaa6588SAlfred Perlstein * available semaphores go here, this includes sem_init and any semaphores 106efaa6588SAlfred Perlstein * created via sem_open that have not yet been unlinked. 107efaa6588SAlfred Perlstein */ 108efaa6588SAlfred Perlstein LIST_HEAD(, ksem) ksem_head = LIST_HEAD_INITIALIZER(&ksem_head); 109efaa6588SAlfred Perlstein /* 110efaa6588SAlfred Perlstein * semaphores still in use but have been sem_unlink()'d go here. 111efaa6588SAlfred Perlstein */ 112efaa6588SAlfred Perlstein LIST_HEAD(, ksem) ksem_deadhead = LIST_HEAD_INITIALIZER(&ksem_deadhead); 113efaa6588SAlfred Perlstein 114efaa6588SAlfred Perlstein static struct mtx sem_lock; 115efaa6588SAlfred Perlstein static MALLOC_DEFINE(M_SEM, "sems", "semaphore data"); 116efaa6588SAlfred Perlstein 117efaa6588SAlfred Perlstein static int nsems = 0; 118efaa6588SAlfred Perlstein SYSCTL_DECL(_p1003_1b); 119efaa6588SAlfred Perlstein SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0, ""); 120efaa6588SAlfred Perlstein 12175b8b3b2SJohn Baldwin static eventhandler_tag sem_exit_tag, sem_exec_tag; 12275b8b3b2SJohn Baldwin 123c814aa3fSAlfred Perlstein #ifdef SEM_DEBUG 124c814aa3fSAlfred Perlstein #define DP(x) printf x 125c814aa3fSAlfred Perlstein #else 126c814aa3fSAlfred Perlstein #define DP(x) 127c814aa3fSAlfred Perlstein #endif 128c814aa3fSAlfred Perlstein 129efaa6588SAlfred Perlstein static __inline 130efaa6588SAlfred Perlstein void 131efaa6588SAlfred Perlstein sem_ref(struct ksem *ks) 132efaa6588SAlfred Perlstein { 133efaa6588SAlfred Perlstein 1340fddf92dSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 135efaa6588SAlfred Perlstein ks->ks_ref++; 136c814aa3fSAlfred Perlstein DP(("sem_ref: ks = %p, ref = %d\n", ks, ks->ks_ref)); 137efaa6588SAlfred Perlstein } 138efaa6588SAlfred Perlstein 139efaa6588SAlfred Perlstein static __inline 140efaa6588SAlfred Perlstein void 141efaa6588SAlfred Perlstein sem_rel(struct ksem *ks) 142efaa6588SAlfred Perlstein { 143efaa6588SAlfred Perlstein 1440fddf92dSRobert Watson mtx_assert(&sem_lock, MA_OWNED); 145c814aa3fSAlfred Perlstein DP(("sem_rel: ks = %p, ref = %d\n", ks, ks->ks_ref - 1)); 146efaa6588SAlfred Perlstein if (--ks->ks_ref == 0) 147efaa6588SAlfred Perlstein sem_free(ks); 148efaa6588SAlfred Perlstein } 149efaa6588SAlfred Perlstein 150efaa6588SAlfred Perlstein static __inline struct ksem *id_to_sem(semid_t id); 151efaa6588SAlfred Perlstein 152efaa6588SAlfred Perlstein static __inline 153efaa6588SAlfred Perlstein struct ksem * 154efaa6588SAlfred Perlstein id_to_sem(id) 155efaa6588SAlfred Perlstein semid_t id; 156efaa6588SAlfred Perlstein { 157efaa6588SAlfred Perlstein struct ksem *ks; 158efaa6588SAlfred Perlstein 159c814aa3fSAlfred Perlstein DP(("id_to_sem: id = %0x,%p\n", id, (struct ksem *)id)); 160efaa6588SAlfred Perlstein LIST_FOREACH(ks, &ksem_head, ks_entry) { 161c814aa3fSAlfred Perlstein DP(("id_to_sem: ks = %p\n", ks)); 162efaa6588SAlfred Perlstein if (ks == (struct ksem *)id) 163efaa6588SAlfred Perlstein return (ks); 164efaa6588SAlfred Perlstein } 165efaa6588SAlfred Perlstein return (NULL); 166efaa6588SAlfred Perlstein } 167efaa6588SAlfred Perlstein 168c3053131SPoul-Henning Kamp static struct ksem * 169efaa6588SAlfred Perlstein sem_lookup_byname(name) 170efaa6588SAlfred Perlstein const char *name; 171efaa6588SAlfred Perlstein { 172efaa6588SAlfred Perlstein struct ksem *ks; 173efaa6588SAlfred Perlstein 174efaa6588SAlfred Perlstein LIST_FOREACH(ks, &ksem_head, ks_entry) 175efaa6588SAlfred Perlstein if (ks->ks_name != NULL && strcmp(ks->ks_name, name) == 0) 176efaa6588SAlfred Perlstein return (ks); 177efaa6588SAlfred Perlstein return (NULL); 178efaa6588SAlfred Perlstein } 179efaa6588SAlfred Perlstein 180c3053131SPoul-Henning Kamp static int 181efaa6588SAlfred Perlstein sem_create(td, name, ksret, mode, value) 182efaa6588SAlfred Perlstein struct thread *td; 183efaa6588SAlfred Perlstein const char *name; 184efaa6588SAlfred Perlstein struct ksem **ksret; 185efaa6588SAlfred Perlstein mode_t mode; 186efaa6588SAlfred Perlstein unsigned int value; 187efaa6588SAlfred Perlstein { 188efaa6588SAlfred Perlstein struct ksem *ret; 189efaa6588SAlfred Perlstein struct proc *p; 190efaa6588SAlfred Perlstein struct ucred *uc; 191efaa6588SAlfred Perlstein size_t len; 192efaa6588SAlfred Perlstein int error; 193efaa6588SAlfred Perlstein 194c814aa3fSAlfred Perlstein DP(("sem_create\n")); 195efaa6588SAlfred Perlstein p = td->td_proc; 196b2546660SJohn Baldwin uc = td->td_ucred; 197efaa6588SAlfred Perlstein if (value > SEM_VALUE_MAX) 198efaa6588SAlfred Perlstein return (EINVAL); 199a163d034SWarner Losh ret = malloc(sizeof(*ret), M_SEM, M_WAITOK | M_ZERO); 200efaa6588SAlfred Perlstein if (name != NULL) { 201efaa6588SAlfred Perlstein len = strlen(name); 202efaa6588SAlfred Perlstein if (len > SEM_MAX_NAMELEN) { 203efaa6588SAlfred Perlstein free(ret, M_SEM); 204efaa6588SAlfred Perlstein return (ENAMETOOLONG); 205efaa6588SAlfred Perlstein } 206efaa6588SAlfred Perlstein /* name must start with a '/' but not contain one. */ 207efaa6588SAlfred Perlstein if (*name != '/' || len < 2 || index(name + 1, '/') != NULL) { 208efaa6588SAlfred Perlstein free(ret, M_SEM); 209efaa6588SAlfred Perlstein return (EINVAL); 210efaa6588SAlfred Perlstein } 211a163d034SWarner Losh ret->ks_name = malloc(len + 1, M_SEM, M_WAITOK); 212efaa6588SAlfred Perlstein strcpy(ret->ks_name, name); 213efaa6588SAlfred Perlstein } else { 214efaa6588SAlfred Perlstein ret->ks_name = NULL; 215efaa6588SAlfred Perlstein } 216efaa6588SAlfred Perlstein ret->ks_mode = mode; 217efaa6588SAlfred Perlstein ret->ks_value = value; 218efaa6588SAlfred Perlstein ret->ks_ref = 1; 219efaa6588SAlfred Perlstein ret->ks_waiters = 0; 220efaa6588SAlfred Perlstein ret->ks_uid = uc->cr_uid; 221efaa6588SAlfred Perlstein ret->ks_gid = uc->cr_gid; 222efaa6588SAlfred Perlstein ret->ks_onlist = 0; 223efaa6588SAlfred Perlstein cv_init(&ret->ks_cv, "sem"); 224efaa6588SAlfred Perlstein LIST_INIT(&ret->ks_users); 225efaa6588SAlfred Perlstein if (name != NULL) 226efaa6588SAlfred Perlstein sem_enter(td->td_proc, ret); 227efaa6588SAlfred Perlstein *ksret = ret; 228efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 229efaa6588SAlfred Perlstein if (nsems >= p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX)) { 230efaa6588SAlfred Perlstein sem_leave(td->td_proc, ret); 231efaa6588SAlfred Perlstein sem_free(ret); 232efaa6588SAlfred Perlstein error = ENFILE; 233efaa6588SAlfred Perlstein } else { 234efaa6588SAlfred Perlstein nsems++; 235efaa6588SAlfred Perlstein error = 0; 236efaa6588SAlfred Perlstein } 237efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 238efaa6588SAlfred Perlstein return (error); 239efaa6588SAlfred Perlstein } 240efaa6588SAlfred Perlstein 241efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 242efaa6588SAlfred Perlstein struct ksem_init_args { 243efaa6588SAlfred Perlstein unsigned int value; 244efaa6588SAlfred Perlstein semid_t *idp; 245efaa6588SAlfred Perlstein }; 246efaa6588SAlfred Perlstein int ksem_init(struct thread *td, struct ksem_init_args *uap); 247efaa6588SAlfred Perlstein #endif 248efaa6588SAlfred Perlstein int 249efaa6588SAlfred Perlstein ksem_init(td, uap) 250efaa6588SAlfred Perlstein struct thread *td; 251efaa6588SAlfred Perlstein struct ksem_init_args *uap; 252efaa6588SAlfred Perlstein { 253efaa6588SAlfred Perlstein int error; 254efaa6588SAlfred Perlstein 255efaa6588SAlfred Perlstein error = kern_sem_init(td, UIO_USERSPACE, uap->value, uap->idp); 256efaa6588SAlfred Perlstein return (error); 257efaa6588SAlfred Perlstein } 258efaa6588SAlfred Perlstein 259efaa6588SAlfred Perlstein static int 260efaa6588SAlfred Perlstein kern_sem_init(td, dir, value, idp) 261efaa6588SAlfred Perlstein struct thread *td; 262efaa6588SAlfred Perlstein int dir; 263efaa6588SAlfred Perlstein unsigned int value; 264efaa6588SAlfred Perlstein semid_t *idp; 265efaa6588SAlfred Perlstein { 266efaa6588SAlfred Perlstein struct ksem *ks; 267efaa6588SAlfred Perlstein semid_t id; 268efaa6588SAlfred Perlstein int error; 269efaa6588SAlfred Perlstein 270efaa6588SAlfred Perlstein error = sem_create(td, NULL, &ks, S_IRWXU | S_IRWXG, value); 271efaa6588SAlfred Perlstein if (error) 272efaa6588SAlfred Perlstein return (error); 273efaa6588SAlfred Perlstein id = SEM_TO_ID(ks); 274efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 275efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 276efaa6588SAlfred Perlstein if (error) { 277efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 278efaa6588SAlfred Perlstein sem_rel(ks); 279efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 280efaa6588SAlfred Perlstein return (error); 281efaa6588SAlfred Perlstein } 282efaa6588SAlfred Perlstein } else { 283efaa6588SAlfred Perlstein *idp = id; 284efaa6588SAlfred Perlstein } 285efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 286efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_head, ks, ks_entry); 287efaa6588SAlfred Perlstein ks->ks_onlist = 1; 288efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 289efaa6588SAlfred Perlstein return (error); 290efaa6588SAlfred Perlstein } 291efaa6588SAlfred Perlstein 292efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 293efaa6588SAlfred Perlstein struct ksem_open_args { 294efaa6588SAlfred Perlstein char *name; 295efaa6588SAlfred Perlstein int oflag; 296efaa6588SAlfred Perlstein mode_t mode; 297efaa6588SAlfred Perlstein unsigned int value; 298efaa6588SAlfred Perlstein semid_t *idp; 299efaa6588SAlfred Perlstein }; 300efaa6588SAlfred Perlstein int ksem_open(struct thread *td, struct ksem_open_args *uap); 301efaa6588SAlfred Perlstein #endif 302efaa6588SAlfred Perlstein int 303efaa6588SAlfred Perlstein ksem_open(td, uap) 304efaa6588SAlfred Perlstein struct thread *td; 305efaa6588SAlfred Perlstein struct ksem_open_args *uap; 306efaa6588SAlfred Perlstein { 307efaa6588SAlfred Perlstein char name[SEM_MAX_NAMELEN + 1]; 308efaa6588SAlfred Perlstein size_t done; 309efaa6588SAlfred Perlstein int error; 310efaa6588SAlfred Perlstein 311efaa6588SAlfred Perlstein error = copyinstr(uap->name, name, SEM_MAX_NAMELEN + 1, &done); 312efaa6588SAlfred Perlstein if (error) 313efaa6588SAlfred Perlstein return (error); 314c814aa3fSAlfred Perlstein DP((">>> sem_open start\n")); 315efaa6588SAlfred Perlstein error = kern_sem_open(td, UIO_USERSPACE, 316efaa6588SAlfred Perlstein name, uap->oflag, uap->mode, uap->value, uap->idp); 317c814aa3fSAlfred Perlstein DP(("<<< sem_open end\n")); 318efaa6588SAlfred Perlstein return (error); 319efaa6588SAlfred Perlstein } 320efaa6588SAlfred Perlstein 321efaa6588SAlfred Perlstein static int 322efaa6588SAlfred Perlstein kern_sem_open(td, dir, name, oflag, mode, value, idp) 323efaa6588SAlfred Perlstein struct thread *td; 324efaa6588SAlfred Perlstein int dir; 325efaa6588SAlfred Perlstein const char *name; 326efaa6588SAlfred Perlstein int oflag; 327efaa6588SAlfred Perlstein mode_t mode; 328efaa6588SAlfred Perlstein unsigned int value; 329efaa6588SAlfred Perlstein semid_t *idp; 330efaa6588SAlfred Perlstein { 331efaa6588SAlfred Perlstein struct ksem *ksnew, *ks; 332efaa6588SAlfred Perlstein int error; 333efaa6588SAlfred Perlstein semid_t id; 334efaa6588SAlfred Perlstein 335efaa6588SAlfred Perlstein ksnew = NULL; 336efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 337efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 338efaa6588SAlfred Perlstein /* 339efaa6588SAlfred Perlstein * If we found it but O_EXCL is set, error. 340efaa6588SAlfred Perlstein */ 341efaa6588SAlfred Perlstein if (ks != NULL && (oflag & O_EXCL) != 0) { 342efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 343efaa6588SAlfred Perlstein return (EEXIST); 344efaa6588SAlfred Perlstein } 345efaa6588SAlfred Perlstein /* 346efaa6588SAlfred Perlstein * If we didn't find it... 347efaa6588SAlfred Perlstein */ 348efaa6588SAlfred Perlstein if (ks == NULL) { 349efaa6588SAlfred Perlstein /* 350efaa6588SAlfred Perlstein * didn't ask for creation? error. 351efaa6588SAlfred Perlstein */ 352efaa6588SAlfred Perlstein if ((oflag & O_CREAT) == 0) { 353efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 354efaa6588SAlfred Perlstein return (ENOENT); 355efaa6588SAlfred Perlstein } 356efaa6588SAlfred Perlstein /* 357efaa6588SAlfred Perlstein * We may block during creation, so drop the lock. 358efaa6588SAlfred Perlstein */ 359efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 360efaa6588SAlfred Perlstein error = sem_create(td, name, &ksnew, mode, value); 361efaa6588SAlfred Perlstein if (error != 0) 362efaa6588SAlfred Perlstein return (error); 363efaa6588SAlfred Perlstein id = SEM_TO_ID(ksnew); 364efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 365c814aa3fSAlfred Perlstein DP(("about to copyout! %d to %p\n", id, idp)); 366efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 367efaa6588SAlfred Perlstein if (error) { 368efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 369efaa6588SAlfred Perlstein sem_leave(td->td_proc, ksnew); 370efaa6588SAlfred Perlstein sem_rel(ksnew); 371efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 372efaa6588SAlfred Perlstein return (error); 373efaa6588SAlfred Perlstein } 374efaa6588SAlfred Perlstein } else { 375c814aa3fSAlfred Perlstein DP(("about to set! %d to %p\n", id, idp)); 376efaa6588SAlfred Perlstein *idp = id; 377efaa6588SAlfred Perlstein } 378efaa6588SAlfred Perlstein /* 379efaa6588SAlfred Perlstein * We need to make sure we haven't lost a race while 380efaa6588SAlfred Perlstein * allocating during creation. 381efaa6588SAlfred Perlstein */ 382efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 383efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 384efaa6588SAlfred Perlstein if (ks != NULL) { 385efaa6588SAlfred Perlstein /* we lost... */ 386efaa6588SAlfred Perlstein sem_leave(td->td_proc, ksnew); 387efaa6588SAlfred Perlstein sem_rel(ksnew); 388efaa6588SAlfred Perlstein /* we lost and we can't loose... */ 389efaa6588SAlfred Perlstein if ((oflag & O_EXCL) != 0) { 390efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 391efaa6588SAlfred Perlstein return (EEXIST); 392efaa6588SAlfred Perlstein } 393efaa6588SAlfred Perlstein } else { 394c814aa3fSAlfred Perlstein DP(("sem_create: about to add to list...\n")); 395efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_head, ksnew, ks_entry); 396c814aa3fSAlfred Perlstein DP(("sem_create: setting list bit...\n")); 397efaa6588SAlfred Perlstein ksnew->ks_onlist = 1; 398c814aa3fSAlfred Perlstein DP(("sem_create: done, about to unlock...\n")); 399efaa6588SAlfred Perlstein } 400efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 401efaa6588SAlfred Perlstein } else { 402efaa6588SAlfred Perlstein /* 403efaa6588SAlfred Perlstein * if we aren't the creator, then enforce permissions. 404efaa6588SAlfred Perlstein */ 405b2546660SJohn Baldwin error = sem_perm(td, ks); 406efaa6588SAlfred Perlstein if (!error) 407efaa6588SAlfred Perlstein sem_ref(ks); 408efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 409efaa6588SAlfred Perlstein if (error) 410efaa6588SAlfred Perlstein return (error); 411efaa6588SAlfred Perlstein id = SEM_TO_ID(ks); 412efaa6588SAlfred Perlstein if (dir == UIO_USERSPACE) { 413efaa6588SAlfred Perlstein error = copyout(&id, idp, sizeof(id)); 414efaa6588SAlfred Perlstein if (error) { 415efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 416efaa6588SAlfred Perlstein sem_rel(ks); 417efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 418efaa6588SAlfred Perlstein return (error); 419efaa6588SAlfred Perlstein } 420efaa6588SAlfred Perlstein } else { 421efaa6588SAlfred Perlstein *idp = id; 422efaa6588SAlfred Perlstein } 423efaa6588SAlfred Perlstein sem_enter(td->td_proc, ks); 424efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 425efaa6588SAlfred Perlstein sem_rel(ks); 426efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 427efaa6588SAlfred Perlstein } 428efaa6588SAlfred Perlstein return (error); 429efaa6588SAlfred Perlstein } 430efaa6588SAlfred Perlstein 431c3053131SPoul-Henning Kamp static int 432b2546660SJohn Baldwin sem_perm(td, ks) 433b2546660SJohn Baldwin struct thread *td; 434efaa6588SAlfred Perlstein struct ksem *ks; 435efaa6588SAlfred Perlstein { 436efaa6588SAlfred Perlstein struct ucred *uc; 437efaa6588SAlfred Perlstein 438b2546660SJohn Baldwin uc = td->td_ucred; 439c814aa3fSAlfred Perlstein DP(("sem_perm: uc(%d,%d) ks(%d,%d,%o)\n", 440efaa6588SAlfred Perlstein uc->cr_uid, uc->cr_gid, 441c814aa3fSAlfred Perlstein ks->ks_uid, ks->ks_gid, ks->ks_mode)); 442efaa6588SAlfred Perlstein if ((uc->cr_uid == ks->ks_uid && (ks->ks_mode & S_IWUSR) != 0) || 443efaa6588SAlfred Perlstein (uc->cr_gid == ks->ks_gid && (ks->ks_mode & S_IWGRP) != 0) || 444b2546660SJohn Baldwin (ks->ks_mode & S_IWOTH) != 0 || suser(td) == 0) 445efaa6588SAlfred Perlstein return (0); 446efaa6588SAlfred Perlstein return (EPERM); 447efaa6588SAlfred Perlstein } 448efaa6588SAlfred Perlstein 449c3053131SPoul-Henning Kamp static void 450efaa6588SAlfred Perlstein sem_free(struct ksem *ks) 451efaa6588SAlfred Perlstein { 452efaa6588SAlfred Perlstein 453efaa6588SAlfred Perlstein nsems--; 454efaa6588SAlfred Perlstein if (ks->ks_onlist) 455efaa6588SAlfred Perlstein LIST_REMOVE(ks, ks_entry); 456efaa6588SAlfred Perlstein if (ks->ks_name != NULL) 457efaa6588SAlfred Perlstein free(ks->ks_name, M_SEM); 458efaa6588SAlfred Perlstein cv_destroy(&ks->ks_cv); 459efaa6588SAlfred Perlstein free(ks, M_SEM); 460efaa6588SAlfred Perlstein } 461efaa6588SAlfred Perlstein 462efaa6588SAlfred Perlstein static __inline struct kuser *sem_getuser(struct proc *p, struct ksem *ks); 463efaa6588SAlfred Perlstein 464efaa6588SAlfred Perlstein static __inline struct kuser * 465efaa6588SAlfred Perlstein sem_getuser(p, ks) 466efaa6588SAlfred Perlstein struct proc *p; 467efaa6588SAlfred Perlstein struct ksem *ks; 468efaa6588SAlfred Perlstein { 469efaa6588SAlfred Perlstein struct kuser *k; 470efaa6588SAlfred Perlstein 471efaa6588SAlfred Perlstein LIST_FOREACH(k, &ks->ks_users, ku_next) 472efaa6588SAlfred Perlstein if (k->ku_pid == p->p_pid) 473efaa6588SAlfred Perlstein return (k); 474efaa6588SAlfred Perlstein return (NULL); 475efaa6588SAlfred Perlstein } 476efaa6588SAlfred Perlstein 477c3053131SPoul-Henning Kamp static int 478b2546660SJohn Baldwin sem_hasopen(td, ks) 479b2546660SJohn Baldwin struct thread *td; 480efaa6588SAlfred Perlstein struct ksem *ks; 481efaa6588SAlfred Perlstein { 482efaa6588SAlfred Perlstein 483aae94fbbSDaniel Eischen return ((ks->ks_name == NULL && sem_perm(td, ks) == 0) 484b2546660SJohn Baldwin || sem_getuser(td->td_proc, ks) != NULL); 485efaa6588SAlfred Perlstein } 486efaa6588SAlfred Perlstein 487c3053131SPoul-Henning Kamp static int 488efaa6588SAlfred Perlstein sem_leave(p, ks) 489efaa6588SAlfred Perlstein struct proc *p; 490efaa6588SAlfred Perlstein struct ksem *ks; 491efaa6588SAlfred Perlstein { 492efaa6588SAlfred Perlstein struct kuser *k; 493efaa6588SAlfred Perlstein 494c814aa3fSAlfred Perlstein DP(("sem_leave: ks = %p\n", ks)); 495efaa6588SAlfred Perlstein k = sem_getuser(p, ks); 496c814aa3fSAlfred Perlstein DP(("sem_leave: ks = %p, k = %p\n", ks, k)); 497efaa6588SAlfred Perlstein if (k != NULL) { 498efaa6588SAlfred Perlstein LIST_REMOVE(k, ku_next); 499efaa6588SAlfred Perlstein sem_rel(ks); 500c814aa3fSAlfred Perlstein DP(("sem_leave: about to free k\n")); 501efaa6588SAlfred Perlstein free(k, M_SEM); 502c814aa3fSAlfred Perlstein DP(("sem_leave: returning\n")); 503efaa6588SAlfred Perlstein return (0); 504efaa6588SAlfred Perlstein } 505b3890a1cSAlfred Perlstein return (EINVAL); 506efaa6588SAlfred Perlstein } 507efaa6588SAlfred Perlstein 508c3053131SPoul-Henning Kamp static void 509efaa6588SAlfred Perlstein sem_enter(p, ks) 510efaa6588SAlfred Perlstein struct proc *p; 511efaa6588SAlfred Perlstein struct ksem *ks; 512efaa6588SAlfred Perlstein { 513efaa6588SAlfred Perlstein struct kuser *ku, *k; 514efaa6588SAlfred Perlstein 515a163d034SWarner Losh ku = malloc(sizeof(*ku), M_SEM, M_WAITOK); 516efaa6588SAlfred Perlstein ku->ku_pid = p->p_pid; 517efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 518efaa6588SAlfred Perlstein k = sem_getuser(p, ks); 519efaa6588SAlfred Perlstein if (k != NULL) { 520efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 521efaa6588SAlfred Perlstein free(ku, M_TEMP); 522efaa6588SAlfred Perlstein return; 523efaa6588SAlfred Perlstein } 524efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ks->ks_users, ku, ku_next); 525efaa6588SAlfred Perlstein sem_ref(ks); 526efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 527efaa6588SAlfred Perlstein } 528efaa6588SAlfred Perlstein 529efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 530efaa6588SAlfred Perlstein struct ksem_unlink_args { 531efaa6588SAlfred Perlstein char *name; 532efaa6588SAlfred Perlstein }; 533efaa6588SAlfred Perlstein int ksem_unlink(struct thread *td, struct ksem_unlink_args *uap); 534efaa6588SAlfred Perlstein #endif 535efaa6588SAlfred Perlstein 536efaa6588SAlfred Perlstein int 537efaa6588SAlfred Perlstein ksem_unlink(td, uap) 538efaa6588SAlfred Perlstein struct thread *td; 539efaa6588SAlfred Perlstein struct ksem_unlink_args *uap; 540efaa6588SAlfred Perlstein { 541efaa6588SAlfred Perlstein char name[SEM_MAX_NAMELEN + 1]; 542efaa6588SAlfred Perlstein size_t done; 543efaa6588SAlfred Perlstein int error; 544efaa6588SAlfred Perlstein 545efaa6588SAlfred Perlstein error = copyinstr(uap->name, name, SEM_MAX_NAMELEN + 1, &done); 546efaa6588SAlfred Perlstein return (error ? error : 547efaa6588SAlfred Perlstein kern_sem_unlink(td, name)); 548efaa6588SAlfred Perlstein } 549efaa6588SAlfred Perlstein 550efaa6588SAlfred Perlstein static int 551efaa6588SAlfred Perlstein kern_sem_unlink(td, name) 552efaa6588SAlfred Perlstein struct thread *td; 553efaa6588SAlfred Perlstein const char *name; 554efaa6588SAlfred Perlstein { 555efaa6588SAlfred Perlstein struct ksem *ks; 556efaa6588SAlfred Perlstein int error; 557efaa6588SAlfred Perlstein 558efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 559efaa6588SAlfred Perlstein ks = sem_lookup_byname(name); 560efaa6588SAlfred Perlstein if (ks == NULL) 561efaa6588SAlfred Perlstein error = ENOENT; 562efaa6588SAlfred Perlstein else 563b2546660SJohn Baldwin error = sem_perm(td, ks); 564c814aa3fSAlfred Perlstein DP(("sem_unlink: '%s' ks = %p, error = %d\n", name, ks, error)); 565efaa6588SAlfred Perlstein if (error == 0) { 566efaa6588SAlfred Perlstein LIST_REMOVE(ks, ks_entry); 567efaa6588SAlfred Perlstein LIST_INSERT_HEAD(&ksem_deadhead, ks, ks_entry); 568efaa6588SAlfred Perlstein sem_rel(ks); 569efaa6588SAlfred Perlstein } 570efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 571efaa6588SAlfred Perlstein return (error); 572efaa6588SAlfred Perlstein } 573efaa6588SAlfred Perlstein 574efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 575efaa6588SAlfred Perlstein struct ksem_close_args { 576efaa6588SAlfred Perlstein semid_t id; 577efaa6588SAlfred Perlstein }; 578efaa6588SAlfred Perlstein int ksem_close(struct thread *td, struct ksem_close_args *uap); 579efaa6588SAlfred Perlstein #endif 580efaa6588SAlfred Perlstein 581efaa6588SAlfred Perlstein int 582efaa6588SAlfred Perlstein ksem_close(struct thread *td, struct ksem_close_args *uap) 583efaa6588SAlfred Perlstein { 584efaa6588SAlfred Perlstein 585efaa6588SAlfred Perlstein return (kern_sem_close(td, uap->id)); 586efaa6588SAlfred Perlstein } 587efaa6588SAlfred Perlstein 588c3053131SPoul-Henning Kamp static int 589efaa6588SAlfred Perlstein kern_sem_close(td, id) 590efaa6588SAlfred Perlstein struct thread *td; 591efaa6588SAlfred Perlstein semid_t id; 592efaa6588SAlfred Perlstein { 593efaa6588SAlfred Perlstein struct ksem *ks; 594efaa6588SAlfred Perlstein int error; 595efaa6588SAlfred Perlstein 596efaa6588SAlfred Perlstein error = EINVAL; 597efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 598efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 599efaa6588SAlfred Perlstein /* this is not a valid operation for unnamed sems */ 600efaa6588SAlfred Perlstein if (ks != NULL && ks->ks_name != NULL) 601b3890a1cSAlfred Perlstein error = sem_leave(td->td_proc, ks); 602efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 603b3890a1cSAlfred Perlstein return (error); 604efaa6588SAlfred Perlstein } 605efaa6588SAlfred Perlstein 606efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 607efaa6588SAlfred Perlstein struct ksem_post_args { 608efaa6588SAlfred Perlstein semid_t id; 609efaa6588SAlfred Perlstein }; 610efaa6588SAlfred Perlstein int ksem_post(struct thread *td, struct ksem_post_args *uap); 611efaa6588SAlfred Perlstein #endif 612efaa6588SAlfred Perlstein int 613efaa6588SAlfred Perlstein ksem_post(td, uap) 614efaa6588SAlfred Perlstein struct thread *td; 615efaa6588SAlfred Perlstein struct ksem_post_args *uap; 616efaa6588SAlfred Perlstein { 617efaa6588SAlfred Perlstein 618efaa6588SAlfred Perlstein return (kern_sem_post(td, uap->id)); 619efaa6588SAlfred Perlstein } 620efaa6588SAlfred Perlstein 621c3053131SPoul-Henning Kamp static int 622efaa6588SAlfred Perlstein kern_sem_post(td, id) 623efaa6588SAlfred Perlstein struct thread *td; 624efaa6588SAlfred Perlstein semid_t id; 625efaa6588SAlfred Perlstein { 626efaa6588SAlfred Perlstein struct ksem *ks; 627efaa6588SAlfred Perlstein int error; 628efaa6588SAlfred Perlstein 629efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 630efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 631b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks)) { 632efaa6588SAlfred Perlstein error = EINVAL; 633efaa6588SAlfred Perlstein goto err; 634efaa6588SAlfred Perlstein } 635efaa6588SAlfred Perlstein if (ks->ks_value == SEM_VALUE_MAX) { 636efaa6588SAlfred Perlstein error = EOVERFLOW; 637efaa6588SAlfred Perlstein goto err; 638efaa6588SAlfred Perlstein } 639efaa6588SAlfred Perlstein ++ks->ks_value; 640efaa6588SAlfred Perlstein if (ks->ks_waiters > 0) 641efaa6588SAlfred Perlstein cv_signal(&ks->ks_cv); 642efaa6588SAlfred Perlstein error = 0; 643efaa6588SAlfred Perlstein err: 644efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 645efaa6588SAlfred Perlstein return (error); 646efaa6588SAlfred Perlstein } 647efaa6588SAlfred Perlstein 648efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 649efaa6588SAlfred Perlstein struct ksem_wait_args { 650efaa6588SAlfred Perlstein semid_t id; 651efaa6588SAlfred Perlstein }; 652efaa6588SAlfred Perlstein int ksem_wait(struct thread *td, struct ksem_wait_args *uap); 653efaa6588SAlfred Perlstein #endif 654efaa6588SAlfred Perlstein 655efaa6588SAlfred Perlstein int 656efaa6588SAlfred Perlstein ksem_wait(td, uap) 657efaa6588SAlfred Perlstein struct thread *td; 658efaa6588SAlfred Perlstein struct ksem_wait_args *uap; 659efaa6588SAlfred Perlstein { 660efaa6588SAlfred Perlstein 661aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, NULL)); 662aae94fbbSDaniel Eischen } 663aae94fbbSDaniel Eischen 664aae94fbbSDaniel Eischen #ifndef _SYS_SYSPROTO_H_ 665aae94fbbSDaniel Eischen struct ksem_timedwait_args { 666aae94fbbSDaniel Eischen semid_t id; 667aae94fbbSDaniel Eischen struct timespec *abstime; 668aae94fbbSDaniel Eischen }; 669aae94fbbSDaniel Eischen int ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap); 670aae94fbbSDaniel Eischen #endif 671aae94fbbSDaniel Eischen int 672aae94fbbSDaniel Eischen ksem_timedwait(td, uap) 673aae94fbbSDaniel Eischen struct thread *td; 674aae94fbbSDaniel Eischen struct ksem_timedwait_args *uap; 675aae94fbbSDaniel Eischen { 676aae94fbbSDaniel Eischen struct timespec abstime; 677aae94fbbSDaniel Eischen struct timespec *ts; 678aae94fbbSDaniel Eischen int error; 679aae94fbbSDaniel Eischen 680aae94fbbSDaniel Eischen /* We allow a null timespec (wait forever). */ 681aae94fbbSDaniel Eischen if (uap->abstime == NULL) 682aae94fbbSDaniel Eischen ts = NULL; 683aae94fbbSDaniel Eischen else { 684aae94fbbSDaniel Eischen error = copyin(uap->abstime, &abstime, sizeof(abstime)); 685aae94fbbSDaniel Eischen if (error != 0) 686aae94fbbSDaniel Eischen return (error); 687aae94fbbSDaniel Eischen if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 688aae94fbbSDaniel Eischen return (EINVAL); 689aae94fbbSDaniel Eischen ts = &abstime; 690aae94fbbSDaniel Eischen } 691aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, ts)); 692efaa6588SAlfred Perlstein } 693efaa6588SAlfred Perlstein 694efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 695efaa6588SAlfred Perlstein struct ksem_trywait_args { 696efaa6588SAlfred Perlstein semid_t id; 697efaa6588SAlfred Perlstein }; 698efaa6588SAlfred Perlstein int ksem_trywait(struct thread *td, struct ksem_trywait_args *uap); 699efaa6588SAlfred Perlstein #endif 700efaa6588SAlfred Perlstein int 701efaa6588SAlfred Perlstein ksem_trywait(td, uap) 702efaa6588SAlfred Perlstein struct thread *td; 703efaa6588SAlfred Perlstein struct ksem_trywait_args *uap; 704efaa6588SAlfred Perlstein { 705efaa6588SAlfred Perlstein 706aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 1, NULL)); 707efaa6588SAlfred Perlstein } 708efaa6588SAlfred Perlstein 709c3053131SPoul-Henning Kamp static int 710aae94fbbSDaniel Eischen kern_sem_wait(td, id, tryflag, abstime) 711efaa6588SAlfred Perlstein struct thread *td; 712efaa6588SAlfred Perlstein semid_t id; 713efaa6588SAlfred Perlstein int tryflag; 714aae94fbbSDaniel Eischen struct timespec *abstime; 715efaa6588SAlfred Perlstein { 716aae94fbbSDaniel Eischen struct timespec ts1, ts2; 717aae94fbbSDaniel Eischen struct timeval tv; 718efaa6588SAlfred Perlstein struct ksem *ks; 719efaa6588SAlfred Perlstein int error; 720efaa6588SAlfred Perlstein 721c814aa3fSAlfred Perlstein DP((">>> kern_sem_wait entered!\n")); 722efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 723efaa6588SAlfred Perlstein ks = ID_TO_SEM(id); 724efaa6588SAlfred Perlstein if (ks == NULL) { 725c814aa3fSAlfred Perlstein DP(("kern_sem_wait ks == NULL\n")); 726efaa6588SAlfred Perlstein error = EINVAL; 727efaa6588SAlfred Perlstein goto err; 728efaa6588SAlfred Perlstein } 729efaa6588SAlfred Perlstein sem_ref(ks); 730b2546660SJohn Baldwin if (!sem_hasopen(td, ks)) { 731c814aa3fSAlfred Perlstein DP(("kern_sem_wait hasopen failed\n")); 732efaa6588SAlfred Perlstein error = EINVAL; 733efaa6588SAlfred Perlstein goto err; 734efaa6588SAlfred Perlstein } 735c814aa3fSAlfred Perlstein DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); 736efaa6588SAlfred Perlstein if (ks->ks_value == 0) { 737efaa6588SAlfred Perlstein ks->ks_waiters++; 738aae94fbbSDaniel Eischen if (tryflag != 0) 739aae94fbbSDaniel Eischen error = EAGAIN; 740aae94fbbSDaniel Eischen else if (abstime == NULL) 741aae94fbbSDaniel Eischen error = cv_wait_sig(&ks->ks_cv, &sem_lock); 742aae94fbbSDaniel Eischen else { 743aae94fbbSDaniel Eischen for (;;) { 744aae94fbbSDaniel Eischen ts1 = *abstime; 745aae94fbbSDaniel Eischen getnanotime(&ts2); 746aae94fbbSDaniel Eischen timespecsub(&ts1, &ts2); 747aae94fbbSDaniel Eischen TIMESPEC_TO_TIMEVAL(&tv, &ts1); 748aae94fbbSDaniel Eischen if (tv.tv_sec < 0) { 749aae94fbbSDaniel Eischen error = ETIMEDOUT; 750aae94fbbSDaniel Eischen break; 751aae94fbbSDaniel Eischen } 752aae94fbbSDaniel Eischen error = cv_timedwait_sig(&ks->ks_cv, 753aae94fbbSDaniel Eischen &sem_lock, tvtohz(&tv)); 754aae94fbbSDaniel Eischen if (error != EWOULDBLOCK) 755aae94fbbSDaniel Eischen break; 756aae94fbbSDaniel Eischen } 757aae94fbbSDaniel Eischen } 758efaa6588SAlfred Perlstein ks->ks_waiters--; 759efaa6588SAlfred Perlstein if (error) 760efaa6588SAlfred Perlstein goto err; 761efaa6588SAlfred Perlstein } 762efaa6588SAlfred Perlstein ks->ks_value--; 763efaa6588SAlfred Perlstein error = 0; 764efaa6588SAlfred Perlstein err: 765efaa6588SAlfred Perlstein if (ks != NULL) 766efaa6588SAlfred Perlstein sem_rel(ks); 767efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 768c814aa3fSAlfred Perlstein DP(("<<< kern_sem_wait leaving, error = %d\n", error)); 769efaa6588SAlfred Perlstein return (error); 770efaa6588SAlfred Perlstein } 771efaa6588SAlfred Perlstein 772efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 773efaa6588SAlfred Perlstein struct ksem_getvalue_args { 774efaa6588SAlfred Perlstein semid_t id; 775efaa6588SAlfred Perlstein int *val; 776efaa6588SAlfred Perlstein }; 777efaa6588SAlfred Perlstein int ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap); 778efaa6588SAlfred Perlstein #endif 779efaa6588SAlfred Perlstein int 780efaa6588SAlfred Perlstein ksem_getvalue(td, uap) 781efaa6588SAlfred Perlstein struct thread *td; 782efaa6588SAlfred Perlstein struct ksem_getvalue_args *uap; 783efaa6588SAlfred Perlstein { 784efaa6588SAlfred Perlstein struct ksem *ks; 785efaa6588SAlfred Perlstein int error, val; 786efaa6588SAlfred Perlstein 787efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 788efaa6588SAlfred Perlstein ks = ID_TO_SEM(uap->id); 789b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks)) { 790efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 791efaa6588SAlfred Perlstein return (EINVAL); 792efaa6588SAlfred Perlstein } 793efaa6588SAlfred Perlstein val = ks->ks_value; 794efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 795efaa6588SAlfred Perlstein error = copyout(&val, uap->val, sizeof(val)); 796efaa6588SAlfred Perlstein return (error); 797efaa6588SAlfred Perlstein } 798efaa6588SAlfred Perlstein 799efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 800efaa6588SAlfred Perlstein struct ksem_destroy_args { 801efaa6588SAlfred Perlstein semid_t id; 802efaa6588SAlfred Perlstein }; 803efaa6588SAlfred Perlstein int ksem_destroy(struct thread *td, struct ksem_destroy_args *uap); 804efaa6588SAlfred Perlstein #endif 805efaa6588SAlfred Perlstein int 806efaa6588SAlfred Perlstein ksem_destroy(td, uap) 807efaa6588SAlfred Perlstein struct thread *td; 808efaa6588SAlfred Perlstein struct ksem_destroy_args *uap; 809efaa6588SAlfred Perlstein { 810efaa6588SAlfred Perlstein struct ksem *ks; 811efaa6588SAlfred Perlstein int error; 812efaa6588SAlfred Perlstein 813efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 814efaa6588SAlfred Perlstein ks = ID_TO_SEM(uap->id); 815b2546660SJohn Baldwin if (ks == NULL || !sem_hasopen(td, ks) || 816efaa6588SAlfred Perlstein ks->ks_name != NULL) { 817efaa6588SAlfred Perlstein error = EINVAL; 818efaa6588SAlfred Perlstein goto err; 819efaa6588SAlfred Perlstein } 820efaa6588SAlfred Perlstein if (ks->ks_waiters != 0) { 821efaa6588SAlfred Perlstein error = EBUSY; 822efaa6588SAlfred Perlstein goto err; 823efaa6588SAlfred Perlstein } 824efaa6588SAlfred Perlstein sem_rel(ks); 825efaa6588SAlfred Perlstein error = 0; 826efaa6588SAlfred Perlstein err: 827efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 828efaa6588SAlfred Perlstein return (error); 829efaa6588SAlfred Perlstein } 830efaa6588SAlfred Perlstein 831c3053131SPoul-Henning Kamp static void 83275b8b3b2SJohn Baldwin sem_exithook(arg, p) 83375b8b3b2SJohn Baldwin void *arg; 834efaa6588SAlfred Perlstein struct proc *p; 835efaa6588SAlfred Perlstein { 836efaa6588SAlfred Perlstein struct ksem *ks, *ksnext; 837efaa6588SAlfred Perlstein 838efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 839efaa6588SAlfred Perlstein ks = LIST_FIRST(&ksem_head); 840efaa6588SAlfred Perlstein while (ks != NULL) { 841efaa6588SAlfred Perlstein ksnext = LIST_NEXT(ks, ks_entry); 842efaa6588SAlfred Perlstein sem_leave(p, ks); 843efaa6588SAlfred Perlstein ks = ksnext; 844efaa6588SAlfred Perlstein } 845efaa6588SAlfred Perlstein ks = LIST_FIRST(&ksem_deadhead); 846efaa6588SAlfred Perlstein while (ks != NULL) { 847efaa6588SAlfred Perlstein ksnext = LIST_NEXT(ks, ks_entry); 848efaa6588SAlfred Perlstein sem_leave(p, ks); 849efaa6588SAlfred Perlstein ks = ksnext; 850efaa6588SAlfred Perlstein } 851efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 852efaa6588SAlfred Perlstein } 853efaa6588SAlfred Perlstein 854efaa6588SAlfred Perlstein static int 855efaa6588SAlfred Perlstein sem_modload(struct module *module, int cmd, void *arg) 856efaa6588SAlfred Perlstein { 857efaa6588SAlfred Perlstein int error = 0; 858efaa6588SAlfred Perlstein 859efaa6588SAlfred Perlstein switch (cmd) { 860efaa6588SAlfred Perlstein case MOD_LOAD: 861efaa6588SAlfred Perlstein mtx_init(&sem_lock, "sem", "semaphore", MTX_DEF); 862efaa6588SAlfred Perlstein p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX); 863efaa6588SAlfred Perlstein p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX); 86475b8b3b2SJohn Baldwin sem_exit_tag = EVENTHANDLER_REGISTER(process_exit, sem_exithook, 86575b8b3b2SJohn Baldwin NULL, EVENTHANDLER_PRI_ANY); 86675b8b3b2SJohn Baldwin sem_exec_tag = EVENTHANDLER_REGISTER(process_exec, sem_exithook, 86775b8b3b2SJohn Baldwin NULL, EVENTHANDLER_PRI_ANY); 868efaa6588SAlfred Perlstein break; 869efaa6588SAlfred Perlstein case MOD_UNLOAD: 870efaa6588SAlfred Perlstein if (nsems != 0) { 871efaa6588SAlfred Perlstein error = EOPNOTSUPP; 872efaa6588SAlfred Perlstein break; 873efaa6588SAlfred Perlstein } 87475b8b3b2SJohn Baldwin EVENTHANDLER_DEREGISTER(process_exit, sem_exit_tag); 87575b8b3b2SJohn Baldwin EVENTHANDLER_DEREGISTER(process_exec, sem_exec_tag); 876efaa6588SAlfred Perlstein mtx_destroy(&sem_lock); 877efaa6588SAlfred Perlstein break; 878efaa6588SAlfred Perlstein case MOD_SHUTDOWN: 879efaa6588SAlfred Perlstein break; 880efaa6588SAlfred Perlstein default: 881efaa6588SAlfred Perlstein error = EINVAL; 882efaa6588SAlfred Perlstein break; 883efaa6588SAlfred Perlstein } 884efaa6588SAlfred Perlstein return (error); 885efaa6588SAlfred Perlstein } 886efaa6588SAlfred Perlstein 887efaa6588SAlfred Perlstein static moduledata_t sem_mod = { 888efaa6588SAlfred Perlstein "sem", 889efaa6588SAlfred Perlstein &sem_modload, 890efaa6588SAlfred Perlstein NULL 891efaa6588SAlfred Perlstein }; 892efaa6588SAlfred Perlstein 893efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_init); 894efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_open); 895efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_unlink); 896efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_close); 897efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_post); 898efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_wait); 899aae94fbbSDaniel Eischen SYSCALL_MODULE_HELPER(ksem_timedwait); 900efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_trywait); 901efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_getvalue); 902efaa6588SAlfred Perlstein SYSCALL_MODULE_HELPER(ksem_destroy); 903efaa6588SAlfred Perlstein 904efaa6588SAlfred Perlstein DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST); 905efaa6588SAlfred Perlstein MODULE_VERSION(sem, 1); 906