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 370e5d5bc2SKonstantin Belousov #include "opt_compat.h" 38efaa6588SAlfred Perlstein #include "opt_posix.h" 39efaa6588SAlfred Perlstein 40efaa6588SAlfred Perlstein #include <sys/param.h> 41a9d2f8d8SRobert Watson #include <sys/capability.h> 426bc1e9cdSJohn Baldwin #include <sys/condvar.h> 436bc1e9cdSJohn Baldwin #include <sys/fcntl.h> 446bc1e9cdSJohn Baldwin #include <sys/file.h> 456bc1e9cdSJohn Baldwin #include <sys/filedesc.h> 466bc1e9cdSJohn Baldwin #include <sys/fnv_hash.h> 47efaa6588SAlfred Perlstein #include <sys/kernel.h> 486aeb05d7STom Rhodes #include <sys/ksem.h> 496bc1e9cdSJohn Baldwin #include <sys/lock.h> 506bc1e9cdSJohn Baldwin #include <sys/malloc.h> 516bc1e9cdSJohn Baldwin #include <sys/module.h> 526bc1e9cdSJohn Baldwin #include <sys/mutex.h> 53acd3428bSRobert Watson #include <sys/priv.h> 54efaa6588SAlfred Perlstein #include <sys/proc.h> 556aeb05d7STom Rhodes #include <sys/posix4.h> 566aeb05d7STom Rhodes #include <sys/_semaphore.h> 576bc1e9cdSJohn Baldwin #include <sys/stat.h> 586bc1e9cdSJohn Baldwin #include <sys/syscall.h> 596bc1e9cdSJohn Baldwin #include <sys/syscallsubr.h> 606bc1e9cdSJohn Baldwin #include <sys/sysctl.h> 616bc1e9cdSJohn Baldwin #include <sys/sysent.h> 626bc1e9cdSJohn Baldwin #include <sys/sysproto.h> 636bc1e9cdSJohn Baldwin #include <sys/systm.h> 646bc1e9cdSJohn Baldwin #include <sys/sx.h> 656bc1e9cdSJohn Baldwin #include <sys/vnode.h> 66efaa6588SAlfred Perlstein 67aed55708SRobert Watson #include <security/mac/mac_framework.h> 68aed55708SRobert Watson 699a253c10SAlexander Leidinger FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support"); 706bc1e9cdSJohn Baldwin /* 716bc1e9cdSJohn Baldwin * TODO 726bc1e9cdSJohn Baldwin * 736bc1e9cdSJohn Baldwin * - Resource limits? 746bc1e9cdSJohn Baldwin * - Update fstat(1) 756bc1e9cdSJohn Baldwin * - Replace global sem_lock with mtx_pool locks? 766bc1e9cdSJohn Baldwin * - Add a MAC check_create() hook for creating new named semaphores. 776bc1e9cdSJohn Baldwin */ 78efaa6588SAlfred Perlstein 79efaa6588SAlfred Perlstein #ifndef SEM_MAX 80efaa6588SAlfred Perlstein #define SEM_MAX 30 81efaa6588SAlfred Perlstein #endif 82efaa6588SAlfred Perlstein 83c814aa3fSAlfred Perlstein #ifdef SEM_DEBUG 84c814aa3fSAlfred Perlstein #define DP(x) printf x 85c814aa3fSAlfred Perlstein #else 86c814aa3fSAlfred Perlstein #define DP(x) 87c814aa3fSAlfred Perlstein #endif 88c814aa3fSAlfred Perlstein 896bc1e9cdSJohn Baldwin struct ksem_mapping { 906bc1e9cdSJohn Baldwin char *km_path; 916bc1e9cdSJohn Baldwin Fnv32_t km_fnv; 926bc1e9cdSJohn Baldwin struct ksem *km_ksem; 936bc1e9cdSJohn Baldwin LIST_ENTRY(ksem_mapping) km_link; 946bc1e9cdSJohn Baldwin }; 956bc1e9cdSJohn Baldwin 966bc1e9cdSJohn Baldwin static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor"); 976bc1e9cdSJohn Baldwin static LIST_HEAD(, ksem_mapping) *ksem_dictionary; 986bc1e9cdSJohn Baldwin static struct sx ksem_dict_lock; 996bc1e9cdSJohn Baldwin static struct mtx ksem_count_lock; 1006bc1e9cdSJohn Baldwin static struct mtx sem_lock; 1016bc1e9cdSJohn Baldwin static u_long ksem_hash; 1026bc1e9cdSJohn Baldwin static int ksem_dead; 1036bc1e9cdSJohn Baldwin 1046bc1e9cdSJohn Baldwin #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash]) 1056bc1e9cdSJohn Baldwin 1066bc1e9cdSJohn Baldwin static int nsems = 0; 1076bc1e9cdSJohn Baldwin SYSCTL_DECL(_p1003_1b); 1086bc1e9cdSJohn Baldwin SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0, 1096bc1e9cdSJohn Baldwin "Number of active kernel POSIX semaphores"); 1106bc1e9cdSJohn Baldwin 1116bc1e9cdSJohn Baldwin static int kern_sem_wait(struct thread *td, semid_t id, int tryflag, 1126bc1e9cdSJohn Baldwin struct timespec *abstime); 1136bc1e9cdSJohn Baldwin static int ksem_access(struct ksem *ks, struct ucred *ucred); 1146bc1e9cdSJohn Baldwin static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode, 1156bc1e9cdSJohn Baldwin unsigned int value); 1166bc1e9cdSJohn Baldwin static int ksem_create(struct thread *td, const char *path, 1176bc1e9cdSJohn Baldwin semid_t *semidp, mode_t mode, unsigned int value, 1180e5d5bc2SKonstantin Belousov int flags, int compat32); 1196bc1e9cdSJohn Baldwin static void ksem_drop(struct ksem *ks); 120a9d2f8d8SRobert Watson static int ksem_get(struct thread *td, semid_t id, cap_rights_t rights, 121a9d2f8d8SRobert Watson struct file **fpp); 1226bc1e9cdSJohn Baldwin static struct ksem *ksem_hold(struct ksem *ks); 1236bc1e9cdSJohn Baldwin static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks); 1246bc1e9cdSJohn Baldwin static struct ksem *ksem_lookup(char *path, Fnv32_t fnv); 1256bc1e9cdSJohn Baldwin static void ksem_module_destroy(void); 1266bc1e9cdSJohn Baldwin static int ksem_module_init(void); 1276bc1e9cdSJohn Baldwin static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred); 1286bc1e9cdSJohn Baldwin static int sem_modload(struct module *module, int cmd, void *arg); 1296bc1e9cdSJohn Baldwin 1306bc1e9cdSJohn Baldwin static fo_rdwr_t ksem_read; 1316bc1e9cdSJohn Baldwin static fo_rdwr_t ksem_write; 1326bc1e9cdSJohn Baldwin static fo_truncate_t ksem_truncate; 1336bc1e9cdSJohn Baldwin static fo_ioctl_t ksem_ioctl; 1346bc1e9cdSJohn Baldwin static fo_poll_t ksem_poll; 1356bc1e9cdSJohn Baldwin static fo_kqfilter_t ksem_kqfilter; 1366bc1e9cdSJohn Baldwin static fo_stat_t ksem_stat; 1376bc1e9cdSJohn Baldwin static fo_close_t ksem_closef; 1389c00bb91SKonstantin Belousov static fo_chmod_t ksem_chmod; 1399c00bb91SKonstantin Belousov static fo_chown_t ksem_chown; 1406bc1e9cdSJohn Baldwin 1416bc1e9cdSJohn Baldwin /* File descriptor operations. */ 1426bc1e9cdSJohn Baldwin static struct fileops ksem_ops = { 1436bc1e9cdSJohn Baldwin .fo_read = ksem_read, 1446bc1e9cdSJohn Baldwin .fo_write = ksem_write, 1456bc1e9cdSJohn Baldwin .fo_truncate = ksem_truncate, 1466bc1e9cdSJohn Baldwin .fo_ioctl = ksem_ioctl, 1476bc1e9cdSJohn Baldwin .fo_poll = ksem_poll, 1486bc1e9cdSJohn Baldwin .fo_kqfilter = ksem_kqfilter, 1496bc1e9cdSJohn Baldwin .fo_stat = ksem_stat, 1506bc1e9cdSJohn Baldwin .fo_close = ksem_closef, 1519c00bb91SKonstantin Belousov .fo_chmod = ksem_chmod, 1529c00bb91SKonstantin Belousov .fo_chown = ksem_chown, 1536bc1e9cdSJohn Baldwin .fo_flags = DFLAG_PASSABLE 1546bc1e9cdSJohn Baldwin }; 1556bc1e9cdSJohn Baldwin 1566bc1e9cdSJohn Baldwin FEATURE(posix_sem, "POSIX semaphores"); 1576bc1e9cdSJohn Baldwin 1586bc1e9cdSJohn Baldwin static int 1596bc1e9cdSJohn Baldwin ksem_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 1606bc1e9cdSJohn Baldwin int flags, struct thread *td) 161efaa6588SAlfred Perlstein { 162efaa6588SAlfred Perlstein 1636bc1e9cdSJohn Baldwin return (EOPNOTSUPP); 164efaa6588SAlfred Perlstein } 165efaa6588SAlfred Perlstein 166c3053131SPoul-Henning Kamp static int 1676bc1e9cdSJohn Baldwin ksem_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 1686bc1e9cdSJohn Baldwin int flags, struct thread *td) 169efaa6588SAlfred Perlstein { 1706bc1e9cdSJohn Baldwin 1716bc1e9cdSJohn Baldwin return (EOPNOTSUPP); 1726bc1e9cdSJohn Baldwin } 1736bc1e9cdSJohn Baldwin 1746bc1e9cdSJohn Baldwin static int 1756bc1e9cdSJohn Baldwin ksem_truncate(struct file *fp, off_t length, struct ucred *active_cred, 1766bc1e9cdSJohn Baldwin struct thread *td) 1776bc1e9cdSJohn Baldwin { 1786bc1e9cdSJohn Baldwin 1796bc1e9cdSJohn Baldwin return (EINVAL); 1806bc1e9cdSJohn Baldwin } 1816bc1e9cdSJohn Baldwin 1826bc1e9cdSJohn Baldwin static int 1836bc1e9cdSJohn Baldwin ksem_ioctl(struct file *fp, u_long com, void *data, 1846bc1e9cdSJohn Baldwin struct ucred *active_cred, struct thread *td) 1856bc1e9cdSJohn Baldwin { 1866bc1e9cdSJohn Baldwin 1876bc1e9cdSJohn Baldwin return (EOPNOTSUPP); 1886bc1e9cdSJohn Baldwin } 1896bc1e9cdSJohn Baldwin 1906bc1e9cdSJohn Baldwin static int 1916bc1e9cdSJohn Baldwin ksem_poll(struct file *fp, int events, struct ucred *active_cred, 1926bc1e9cdSJohn Baldwin struct thread *td) 1936bc1e9cdSJohn Baldwin { 1946bc1e9cdSJohn Baldwin 1956bc1e9cdSJohn Baldwin return (EOPNOTSUPP); 1966bc1e9cdSJohn Baldwin } 1976bc1e9cdSJohn Baldwin 1986bc1e9cdSJohn Baldwin static int 1996bc1e9cdSJohn Baldwin ksem_kqfilter(struct file *fp, struct knote *kn) 2006bc1e9cdSJohn Baldwin { 2016bc1e9cdSJohn Baldwin 2026bc1e9cdSJohn Baldwin return (EOPNOTSUPP); 2036bc1e9cdSJohn Baldwin } 2046bc1e9cdSJohn Baldwin 2056bc1e9cdSJohn Baldwin static int 2066bc1e9cdSJohn Baldwin ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 2076bc1e9cdSJohn Baldwin struct thread *td) 2086bc1e9cdSJohn Baldwin { 2096bc1e9cdSJohn Baldwin struct ksem *ks; 2106bc1e9cdSJohn Baldwin #ifdef MAC 2116bc1e9cdSJohn Baldwin int error; 2126bc1e9cdSJohn Baldwin #endif 2136bc1e9cdSJohn Baldwin 2146bc1e9cdSJohn Baldwin ks = fp->f_data; 2156bc1e9cdSJohn Baldwin 2166bc1e9cdSJohn Baldwin #ifdef MAC 2176bc1e9cdSJohn Baldwin error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks); 2186bc1e9cdSJohn Baldwin if (error) 2196bc1e9cdSJohn Baldwin return (error); 2206bc1e9cdSJohn Baldwin #endif 2216bc1e9cdSJohn Baldwin 2226bc1e9cdSJohn Baldwin /* 2236bc1e9cdSJohn Baldwin * Attempt to return sanish values for fstat() on a semaphore 2246bc1e9cdSJohn Baldwin * file descriptor. 2256bc1e9cdSJohn Baldwin */ 2266bc1e9cdSJohn Baldwin bzero(sb, sizeof(*sb)); 2276bc1e9cdSJohn Baldwin 2289c00bb91SKonstantin Belousov mtx_lock(&sem_lock); 229510ea843SEd Schouten sb->st_atim = ks->ks_atime; 230510ea843SEd Schouten sb->st_ctim = ks->ks_ctime; 231510ea843SEd Schouten sb->st_mtim = ks->ks_mtime; 232510ea843SEd Schouten sb->st_birthtim = ks->ks_birthtime; 2336bc1e9cdSJohn Baldwin sb->st_uid = ks->ks_uid; 2346bc1e9cdSJohn Baldwin sb->st_gid = ks->ks_gid; 2359c00bb91SKonstantin Belousov sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */ 2369c00bb91SKonstantin Belousov mtx_unlock(&sem_lock); 2376bc1e9cdSJohn Baldwin 2386bc1e9cdSJohn Baldwin return (0); 2396bc1e9cdSJohn Baldwin } 2406bc1e9cdSJohn Baldwin 2416bc1e9cdSJohn Baldwin static int 2429c00bb91SKonstantin Belousov ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 2439c00bb91SKonstantin Belousov struct thread *td) 2449c00bb91SKonstantin Belousov { 2459c00bb91SKonstantin Belousov struct ksem *ks; 2469c00bb91SKonstantin Belousov int error; 2479c00bb91SKonstantin Belousov 2489c00bb91SKonstantin Belousov error = 0; 2499c00bb91SKonstantin Belousov ks = fp->f_data; 2509c00bb91SKonstantin Belousov mtx_lock(&sem_lock); 2519c00bb91SKonstantin Belousov #ifdef MAC 2529c00bb91SKonstantin Belousov error = mac_posixsem_check_setmode(active_cred, ks, mode); 2539c00bb91SKonstantin Belousov if (error != 0) 2549c00bb91SKonstantin Belousov goto out; 2559c00bb91SKonstantin Belousov #endif 2569c00bb91SKonstantin Belousov error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN, 2579c00bb91SKonstantin Belousov active_cred, NULL); 2589c00bb91SKonstantin Belousov if (error != 0) 2599c00bb91SKonstantin Belousov goto out; 2609c00bb91SKonstantin Belousov ks->ks_mode = mode & ACCESSPERMS; 2619c00bb91SKonstantin Belousov out: 2629c00bb91SKonstantin Belousov mtx_unlock(&sem_lock); 2639c00bb91SKonstantin Belousov return (error); 2649c00bb91SKonstantin Belousov } 2659c00bb91SKonstantin Belousov 2669c00bb91SKonstantin Belousov static int 2679c00bb91SKonstantin Belousov ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 2689c00bb91SKonstantin Belousov struct thread *td) 2699c00bb91SKonstantin Belousov { 2709c00bb91SKonstantin Belousov struct ksem *ks; 2719c00bb91SKonstantin Belousov int error; 2729c00bb91SKonstantin Belousov 2739c00bb91SKonstantin Belousov ks = fp->f_data; 2749c00bb91SKonstantin Belousov mtx_lock(&sem_lock); 2759c00bb91SKonstantin Belousov #ifdef MAC 2769c00bb91SKonstantin Belousov error = mac_posixsem_check_setowner(active_cred, ks, uid, gid); 2779c00bb91SKonstantin Belousov if (error != 0) 2789c00bb91SKonstantin Belousov goto out; 2799c00bb91SKonstantin Belousov #endif 2809c00bb91SKonstantin Belousov if (uid == (uid_t)-1) 2819c00bb91SKonstantin Belousov uid = ks->ks_uid; 2829c00bb91SKonstantin Belousov if (gid == (gid_t)-1) 2839c00bb91SKonstantin Belousov gid = ks->ks_gid; 2849c00bb91SKonstantin Belousov if (((uid != ks->ks_uid && uid != active_cred->cr_uid) || 2859c00bb91SKonstantin Belousov (gid != ks->ks_gid && !groupmember(gid, active_cred))) && 2869c00bb91SKonstantin Belousov (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 2879c00bb91SKonstantin Belousov goto out; 2889c00bb91SKonstantin Belousov ks->ks_uid = uid; 2899c00bb91SKonstantin Belousov ks->ks_gid = gid; 2909c00bb91SKonstantin Belousov out: 2919c00bb91SKonstantin Belousov mtx_unlock(&sem_lock); 2929c00bb91SKonstantin Belousov return (error); 2939c00bb91SKonstantin Belousov } 2949c00bb91SKonstantin Belousov 2959c00bb91SKonstantin Belousov static int 2966bc1e9cdSJohn Baldwin ksem_closef(struct file *fp, struct thread *td) 2976bc1e9cdSJohn Baldwin { 2986bc1e9cdSJohn Baldwin struct ksem *ks; 2996bc1e9cdSJohn Baldwin 3006bc1e9cdSJohn Baldwin ks = fp->f_data; 3016bc1e9cdSJohn Baldwin fp->f_data = NULL; 3026bc1e9cdSJohn Baldwin ksem_drop(ks); 3036bc1e9cdSJohn Baldwin 3046bc1e9cdSJohn Baldwin return (0); 3056bc1e9cdSJohn Baldwin } 3066bc1e9cdSJohn Baldwin 3076bc1e9cdSJohn Baldwin /* 3086bc1e9cdSJohn Baldwin * ksem object management including creation and reference counting 3096bc1e9cdSJohn Baldwin * routines. 3106bc1e9cdSJohn Baldwin */ 3116bc1e9cdSJohn Baldwin static struct ksem * 3126bc1e9cdSJohn Baldwin ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value) 3136bc1e9cdSJohn Baldwin { 3146bc1e9cdSJohn Baldwin struct ksem *ks; 3156bc1e9cdSJohn Baldwin 3166bc1e9cdSJohn Baldwin mtx_lock(&ksem_count_lock); 3176bc1e9cdSJohn Baldwin if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) { 3186bc1e9cdSJohn Baldwin mtx_unlock(&ksem_count_lock); 3196bc1e9cdSJohn Baldwin return (NULL); 3206bc1e9cdSJohn Baldwin } 3216bc1e9cdSJohn Baldwin nsems++; 3226bc1e9cdSJohn Baldwin mtx_unlock(&ksem_count_lock); 3236bc1e9cdSJohn Baldwin ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO); 3246bc1e9cdSJohn Baldwin ks->ks_uid = ucred->cr_uid; 3256bc1e9cdSJohn Baldwin ks->ks_gid = ucred->cr_gid; 3266bc1e9cdSJohn Baldwin ks->ks_mode = mode; 3276bc1e9cdSJohn Baldwin ks->ks_value = value; 3286bc1e9cdSJohn Baldwin cv_init(&ks->ks_cv, "ksem"); 3296bc1e9cdSJohn Baldwin vfs_timestamp(&ks->ks_birthtime); 3306bc1e9cdSJohn Baldwin ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime; 3316bc1e9cdSJohn Baldwin refcount_init(&ks->ks_ref, 1); 3326bc1e9cdSJohn Baldwin #ifdef MAC 3336bc1e9cdSJohn Baldwin mac_posixsem_init(ks); 3346bc1e9cdSJohn Baldwin mac_posixsem_create(ucred, ks); 3356bc1e9cdSJohn Baldwin #endif 3366bc1e9cdSJohn Baldwin 3376bc1e9cdSJohn Baldwin return (ks); 3386bc1e9cdSJohn Baldwin } 3396bc1e9cdSJohn Baldwin 3406bc1e9cdSJohn Baldwin static struct ksem * 3416bc1e9cdSJohn Baldwin ksem_hold(struct ksem *ks) 3426bc1e9cdSJohn Baldwin { 3436bc1e9cdSJohn Baldwin 3446bc1e9cdSJohn Baldwin refcount_acquire(&ks->ks_ref); 3456bc1e9cdSJohn Baldwin return (ks); 3466bc1e9cdSJohn Baldwin } 3476bc1e9cdSJohn Baldwin 3486bc1e9cdSJohn Baldwin static void 3496bc1e9cdSJohn Baldwin ksem_drop(struct ksem *ks) 3506bc1e9cdSJohn Baldwin { 3516bc1e9cdSJohn Baldwin 3526bc1e9cdSJohn Baldwin if (refcount_release(&ks->ks_ref)) { 3536bc1e9cdSJohn Baldwin #ifdef MAC 3546bc1e9cdSJohn Baldwin mac_posixsem_destroy(ks); 3556bc1e9cdSJohn Baldwin #endif 3566bc1e9cdSJohn Baldwin cv_destroy(&ks->ks_cv); 3576bc1e9cdSJohn Baldwin free(ks, M_KSEM); 3586bc1e9cdSJohn Baldwin mtx_lock(&ksem_count_lock); 3596bc1e9cdSJohn Baldwin nsems--; 3606bc1e9cdSJohn Baldwin mtx_unlock(&ksem_count_lock); 3616bc1e9cdSJohn Baldwin } 3626bc1e9cdSJohn Baldwin } 3636bc1e9cdSJohn Baldwin 3646bc1e9cdSJohn Baldwin /* 3656bc1e9cdSJohn Baldwin * Determine if the credentials have sufficient permissions for read 3666bc1e9cdSJohn Baldwin * and write access. 3676bc1e9cdSJohn Baldwin */ 3686bc1e9cdSJohn Baldwin static int 3696bc1e9cdSJohn Baldwin ksem_access(struct ksem *ks, struct ucred *ucred) 3706bc1e9cdSJohn Baldwin { 371efaa6588SAlfred Perlstein int error; 372efaa6588SAlfred Perlstein 3736bc1e9cdSJohn Baldwin error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, 3746bc1e9cdSJohn Baldwin VREAD | VWRITE, ucred, NULL); 3756bc1e9cdSJohn Baldwin if (error) 3766bc1e9cdSJohn Baldwin error = priv_check_cred(ucred, PRIV_SEM_WRITE, 0); 377efaa6588SAlfred Perlstein return (error); 378efaa6588SAlfred Perlstein } 379efaa6588SAlfred Perlstein 3806bc1e9cdSJohn Baldwin /* 3816bc1e9cdSJohn Baldwin * Dictionary management. We maintain an in-kernel dictionary to map 3826bc1e9cdSJohn Baldwin * paths to semaphore objects. We use the FNV hash on the path to 3836bc1e9cdSJohn Baldwin * store the mappings in a hash table. 3846bc1e9cdSJohn Baldwin */ 3856bc1e9cdSJohn Baldwin static struct ksem * 3866bc1e9cdSJohn Baldwin ksem_lookup(char *path, Fnv32_t fnv) 3876bc1e9cdSJohn Baldwin { 3886bc1e9cdSJohn Baldwin struct ksem_mapping *map; 3896bc1e9cdSJohn Baldwin 3906bc1e9cdSJohn Baldwin LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { 3916bc1e9cdSJohn Baldwin if (map->km_fnv != fnv) 3926bc1e9cdSJohn Baldwin continue; 3936bc1e9cdSJohn Baldwin if (strcmp(map->km_path, path) == 0) 3946bc1e9cdSJohn Baldwin return (map->km_ksem); 3956bc1e9cdSJohn Baldwin } 3966bc1e9cdSJohn Baldwin 3976bc1e9cdSJohn Baldwin return (NULL); 3986bc1e9cdSJohn Baldwin } 3996bc1e9cdSJohn Baldwin 4006bc1e9cdSJohn Baldwin static void 4016bc1e9cdSJohn Baldwin ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks) 4026bc1e9cdSJohn Baldwin { 4036bc1e9cdSJohn Baldwin struct ksem_mapping *map; 4046bc1e9cdSJohn Baldwin 4056bc1e9cdSJohn Baldwin map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK); 4066bc1e9cdSJohn Baldwin map->km_path = path; 4076bc1e9cdSJohn Baldwin map->km_fnv = fnv; 4086bc1e9cdSJohn Baldwin map->km_ksem = ksem_hold(ks); 4096bc1e9cdSJohn Baldwin LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link); 4106bc1e9cdSJohn Baldwin } 4116bc1e9cdSJohn Baldwin 4126bc1e9cdSJohn Baldwin static int 4136bc1e9cdSJohn Baldwin ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred) 4146bc1e9cdSJohn Baldwin { 4156bc1e9cdSJohn Baldwin struct ksem_mapping *map; 4166bc1e9cdSJohn Baldwin int error; 4176bc1e9cdSJohn Baldwin 4186bc1e9cdSJohn Baldwin LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { 4196bc1e9cdSJohn Baldwin if (map->km_fnv != fnv) 4206bc1e9cdSJohn Baldwin continue; 4216bc1e9cdSJohn Baldwin if (strcmp(map->km_path, path) == 0) { 4226bc1e9cdSJohn Baldwin #ifdef MAC 4236bc1e9cdSJohn Baldwin error = mac_posixsem_check_unlink(ucred, map->km_ksem); 4246bc1e9cdSJohn Baldwin if (error) 4256bc1e9cdSJohn Baldwin return (error); 4266bc1e9cdSJohn Baldwin #endif 4276bc1e9cdSJohn Baldwin error = ksem_access(map->km_ksem, ucred); 4286bc1e9cdSJohn Baldwin if (error) 4296bc1e9cdSJohn Baldwin return (error); 4306bc1e9cdSJohn Baldwin LIST_REMOVE(map, km_link); 4316bc1e9cdSJohn Baldwin ksem_drop(map->km_ksem); 4326bc1e9cdSJohn Baldwin free(map->km_path, M_KSEM); 4336bc1e9cdSJohn Baldwin free(map, M_KSEM); 4346bc1e9cdSJohn Baldwin return (0); 4356bc1e9cdSJohn Baldwin } 4366bc1e9cdSJohn Baldwin } 4376bc1e9cdSJohn Baldwin 4386bc1e9cdSJohn Baldwin return (ENOENT); 4396bc1e9cdSJohn Baldwin } 4406bc1e9cdSJohn Baldwin 4410e5d5bc2SKonstantin Belousov static int 4420e5d5bc2SKonstantin Belousov ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd, 4430e5d5bc2SKonstantin Belousov int compat32) 4440e5d5bc2SKonstantin Belousov { 4450e5d5bc2SKonstantin Belousov semid_t semid; 4460e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 4470e5d5bc2SKonstantin Belousov int32_t semid32; 4480e5d5bc2SKonstantin Belousov #endif 4490e5d5bc2SKonstantin Belousov void *ptr; 4500e5d5bc2SKonstantin Belousov size_t ptrs; 4510e5d5bc2SKonstantin Belousov 4520e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 4530e5d5bc2SKonstantin Belousov if (compat32) { 4540e5d5bc2SKonstantin Belousov semid32 = fd; 4550e5d5bc2SKonstantin Belousov ptr = &semid32; 4560e5d5bc2SKonstantin Belousov ptrs = sizeof(semid32); 4570e5d5bc2SKonstantin Belousov } else { 4580e5d5bc2SKonstantin Belousov #endif 4590e5d5bc2SKonstantin Belousov semid = fd; 4600e5d5bc2SKonstantin Belousov ptr = &semid; 4610e5d5bc2SKonstantin Belousov ptrs = sizeof(semid); 4620e5d5bc2SKonstantin Belousov compat32 = 0; /* silence gcc */ 4630e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 4640e5d5bc2SKonstantin Belousov } 4650e5d5bc2SKonstantin Belousov #endif 4660e5d5bc2SKonstantin Belousov 4670e5d5bc2SKonstantin Belousov return (copyout(ptr, semidp, ptrs)); 4680e5d5bc2SKonstantin Belousov } 4690e5d5bc2SKonstantin Belousov 4706bc1e9cdSJohn Baldwin /* Other helper routines. */ 4716bc1e9cdSJohn Baldwin static int 4726bc1e9cdSJohn Baldwin ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode, 4730e5d5bc2SKonstantin Belousov unsigned int value, int flags, int compat32) 4746bc1e9cdSJohn Baldwin { 4756bc1e9cdSJohn Baldwin struct filedesc *fdp; 4766bc1e9cdSJohn Baldwin struct ksem *ks; 4776bc1e9cdSJohn Baldwin struct file *fp; 4786bc1e9cdSJohn Baldwin char *path; 4796bc1e9cdSJohn Baldwin Fnv32_t fnv; 4806bc1e9cdSJohn Baldwin int error, fd; 4816bc1e9cdSJohn Baldwin 4826bc1e9cdSJohn Baldwin if (value > SEM_VALUE_MAX) 4836bc1e9cdSJohn Baldwin return (EINVAL); 4846bc1e9cdSJohn Baldwin 4856bc1e9cdSJohn Baldwin fdp = td->td_proc->p_fd; 4866bc1e9cdSJohn Baldwin mode = (mode & ~fdp->fd_cmask) & ACCESSPERMS; 4871fe80828SKonstantin Belousov error = falloc(td, &fp, &fd, 0); 4886bc1e9cdSJohn Baldwin if (error) { 4896bc1e9cdSJohn Baldwin if (name == NULL) 4906bc1e9cdSJohn Baldwin error = ENOSPC; 4916bc1e9cdSJohn Baldwin return (error); 4926bc1e9cdSJohn Baldwin } 4936bc1e9cdSJohn Baldwin 4946bc1e9cdSJohn Baldwin /* 4956bc1e9cdSJohn Baldwin * Go ahead and copyout the file descriptor now. This is a bit 4966bc1e9cdSJohn Baldwin * premature, but it is a lot easier to handle errors as opposed 4976bc1e9cdSJohn Baldwin * to later when we've possibly created a new semaphore, etc. 4986bc1e9cdSJohn Baldwin */ 4990e5d5bc2SKonstantin Belousov error = ksem_create_copyout_semid(td, semidp, fd, compat32); 5006bc1e9cdSJohn Baldwin if (error) { 5016bc1e9cdSJohn Baldwin fdclose(fdp, fp, fd, td); 5026bc1e9cdSJohn Baldwin fdrop(fp, td); 5036bc1e9cdSJohn Baldwin return (error); 5046bc1e9cdSJohn Baldwin } 5056bc1e9cdSJohn Baldwin 5066bc1e9cdSJohn Baldwin if (name == NULL) { 5076bc1e9cdSJohn Baldwin /* Create an anonymous semaphore. */ 5086bc1e9cdSJohn Baldwin ks = ksem_alloc(td->td_ucred, mode, value); 5096bc1e9cdSJohn Baldwin if (ks == NULL) 5106bc1e9cdSJohn Baldwin error = ENOSPC; 5116bc1e9cdSJohn Baldwin else 5126bc1e9cdSJohn Baldwin ks->ks_flags |= KS_ANONYMOUS; 5136bc1e9cdSJohn Baldwin } else { 5146bc1e9cdSJohn Baldwin path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK); 5156bc1e9cdSJohn Baldwin error = copyinstr(name, path, MAXPATHLEN, NULL); 5166bc1e9cdSJohn Baldwin 5176bc1e9cdSJohn Baldwin /* Require paths to start with a '/' character. */ 5186bc1e9cdSJohn Baldwin if (error == 0 && path[0] != '/') 5196bc1e9cdSJohn Baldwin error = EINVAL; 5206bc1e9cdSJohn Baldwin if (error) { 5216bc1e9cdSJohn Baldwin fdclose(fdp, fp, fd, td); 5226bc1e9cdSJohn Baldwin fdrop(fp, td); 5236bc1e9cdSJohn Baldwin free(path, M_KSEM); 5246bc1e9cdSJohn Baldwin return (error); 5256bc1e9cdSJohn Baldwin } 5266bc1e9cdSJohn Baldwin 5276bc1e9cdSJohn Baldwin fnv = fnv_32_str(path, FNV1_32_INIT); 5286bc1e9cdSJohn Baldwin sx_xlock(&ksem_dict_lock); 5296bc1e9cdSJohn Baldwin ks = ksem_lookup(path, fnv); 5306bc1e9cdSJohn Baldwin if (ks == NULL) { 5316bc1e9cdSJohn Baldwin /* Object does not exist, create it if requested. */ 5326bc1e9cdSJohn Baldwin if (flags & O_CREAT) { 5336bc1e9cdSJohn Baldwin ks = ksem_alloc(td->td_ucred, mode, value); 5346bc1e9cdSJohn Baldwin if (ks == NULL) 5356bc1e9cdSJohn Baldwin error = ENFILE; 5366bc1e9cdSJohn Baldwin else { 5376bc1e9cdSJohn Baldwin ksem_insert(path, fnv, ks); 5386bc1e9cdSJohn Baldwin path = NULL; 5396bc1e9cdSJohn Baldwin } 5406bc1e9cdSJohn Baldwin } else 5416bc1e9cdSJohn Baldwin error = ENOENT; 5426bc1e9cdSJohn Baldwin } else { 5436bc1e9cdSJohn Baldwin /* 5446bc1e9cdSJohn Baldwin * Object already exists, obtain a new 5456bc1e9cdSJohn Baldwin * reference if requested and permitted. 5466bc1e9cdSJohn Baldwin */ 5476bc1e9cdSJohn Baldwin if ((flags & (O_CREAT | O_EXCL)) == 5486bc1e9cdSJohn Baldwin (O_CREAT | O_EXCL)) 5496bc1e9cdSJohn Baldwin error = EEXIST; 5506bc1e9cdSJohn Baldwin else { 5516bc1e9cdSJohn Baldwin #ifdef MAC 5526bc1e9cdSJohn Baldwin error = mac_posixsem_check_open(td->td_ucred, 5536bc1e9cdSJohn Baldwin ks); 5546bc1e9cdSJohn Baldwin if (error == 0) 5556bc1e9cdSJohn Baldwin #endif 5566bc1e9cdSJohn Baldwin error = ksem_access(ks, td->td_ucred); 5576bc1e9cdSJohn Baldwin } 5586bc1e9cdSJohn Baldwin if (error == 0) 5596bc1e9cdSJohn Baldwin ksem_hold(ks); 5606bc1e9cdSJohn Baldwin #ifdef INVARIANTS 5616bc1e9cdSJohn Baldwin else 5626bc1e9cdSJohn Baldwin ks = NULL; 5636bc1e9cdSJohn Baldwin #endif 5646bc1e9cdSJohn Baldwin } 5656bc1e9cdSJohn Baldwin sx_xunlock(&ksem_dict_lock); 5666bc1e9cdSJohn Baldwin if (path) 5676bc1e9cdSJohn Baldwin free(path, M_KSEM); 5686bc1e9cdSJohn Baldwin } 5696bc1e9cdSJohn Baldwin 5706bc1e9cdSJohn Baldwin if (error) { 5716bc1e9cdSJohn Baldwin KASSERT(ks == NULL, ("ksem_create error with a ksem")); 5726bc1e9cdSJohn Baldwin fdclose(fdp, fp, fd, td); 5736bc1e9cdSJohn Baldwin fdrop(fp, td); 5746bc1e9cdSJohn Baldwin return (error); 5756bc1e9cdSJohn Baldwin } 5766bc1e9cdSJohn Baldwin KASSERT(ks != NULL, ("ksem_create w/o a ksem")); 5776bc1e9cdSJohn Baldwin 5786bc1e9cdSJohn Baldwin finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops); 5796bc1e9cdSJohn Baldwin 5806bc1e9cdSJohn Baldwin FILEDESC_XLOCK(fdp); 5816bc1e9cdSJohn Baldwin if (fdp->fd_ofiles[fd] == fp) 5826bc1e9cdSJohn Baldwin fdp->fd_ofileflags[fd] |= UF_EXCLOSE; 5836bc1e9cdSJohn Baldwin FILEDESC_XUNLOCK(fdp); 5846bc1e9cdSJohn Baldwin fdrop(fp, td); 5856bc1e9cdSJohn Baldwin 5866bc1e9cdSJohn Baldwin return (0); 5876bc1e9cdSJohn Baldwin } 5886bc1e9cdSJohn Baldwin 5896bc1e9cdSJohn Baldwin static int 590a9d2f8d8SRobert Watson ksem_get(struct thread *td, semid_t id, cap_rights_t rights, struct file **fpp) 5916bc1e9cdSJohn Baldwin { 5926bc1e9cdSJohn Baldwin struct ksem *ks; 5936bc1e9cdSJohn Baldwin struct file *fp; 5946bc1e9cdSJohn Baldwin int error; 5956bc1e9cdSJohn Baldwin 596a9d2f8d8SRobert Watson error = fget(td, id, rights, &fp); 5976bc1e9cdSJohn Baldwin if (error) 5986bc1e9cdSJohn Baldwin return (EINVAL); 5996bc1e9cdSJohn Baldwin if (fp->f_type != DTYPE_SEM) { 6006bc1e9cdSJohn Baldwin fdrop(fp, td); 6016bc1e9cdSJohn Baldwin return (EINVAL); 6026bc1e9cdSJohn Baldwin } 6036bc1e9cdSJohn Baldwin ks = fp->f_data; 6046bc1e9cdSJohn Baldwin if (ks->ks_flags & KS_DEAD) { 6056bc1e9cdSJohn Baldwin fdrop(fp, td); 6066bc1e9cdSJohn Baldwin return (EINVAL); 6076bc1e9cdSJohn Baldwin } 6086bc1e9cdSJohn Baldwin *fpp = fp; 6096bc1e9cdSJohn Baldwin return (0); 6106bc1e9cdSJohn Baldwin } 6116bc1e9cdSJohn Baldwin 6126bc1e9cdSJohn Baldwin /* System calls. */ 613efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 614efaa6588SAlfred Perlstein struct ksem_init_args { 615efaa6588SAlfred Perlstein unsigned int value; 616efaa6588SAlfred Perlstein semid_t *idp; 617efaa6588SAlfred Perlstein }; 618efaa6588SAlfred Perlstein #endif 619efaa6588SAlfred Perlstein int 620c1250af6SRobert Watson ksem_init(struct thread *td, struct ksem_init_args *uap) 621efaa6588SAlfred Perlstein { 622efaa6588SAlfred Perlstein 6236bc1e9cdSJohn Baldwin return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 6240e5d5bc2SKonstantin Belousov 0, 0)); 625efaa6588SAlfred Perlstein } 626efaa6588SAlfred Perlstein 627efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 628efaa6588SAlfred Perlstein struct ksem_open_args { 629efaa6588SAlfred Perlstein char *name; 630efaa6588SAlfred Perlstein int oflag; 631efaa6588SAlfred Perlstein mode_t mode; 632efaa6588SAlfred Perlstein unsigned int value; 633efaa6588SAlfred Perlstein semid_t *idp; 634efaa6588SAlfred Perlstein }; 635efaa6588SAlfred Perlstein #endif 636efaa6588SAlfred Perlstein int 637c1250af6SRobert Watson ksem_open(struct thread *td, struct ksem_open_args *uap) 638efaa6588SAlfred Perlstein { 639efaa6588SAlfred Perlstein 640b2966a5aSBruce M Simpson DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid)); 641b2966a5aSBruce M Simpson 6426bc1e9cdSJohn Baldwin if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) 643b3890a1cSAlfred Perlstein return (EINVAL); 6446bc1e9cdSJohn Baldwin return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, 6450e5d5bc2SKonstantin Belousov uap->oflag, 0)); 646efaa6588SAlfred Perlstein } 647efaa6588SAlfred Perlstein 648efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 649efaa6588SAlfred Perlstein struct ksem_unlink_args { 650efaa6588SAlfred Perlstein char *name; 651efaa6588SAlfred Perlstein }; 652efaa6588SAlfred Perlstein #endif 653efaa6588SAlfred Perlstein int 654c1250af6SRobert Watson ksem_unlink(struct thread *td, struct ksem_unlink_args *uap) 655efaa6588SAlfred Perlstein { 6566bc1e9cdSJohn Baldwin char *path; 6576bc1e9cdSJohn Baldwin Fnv32_t fnv; 658efaa6588SAlfred Perlstein int error; 659efaa6588SAlfred Perlstein 6606bc1e9cdSJohn Baldwin path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 6616bc1e9cdSJohn Baldwin error = copyinstr(uap->name, path, MAXPATHLEN, NULL); 66252648411SRobert Watson if (error) { 6636bc1e9cdSJohn Baldwin free(path, M_TEMP); 66452648411SRobert Watson return (error); 66552648411SRobert Watson } 6666bc1e9cdSJohn Baldwin 6676bc1e9cdSJohn Baldwin fnv = fnv_32_str(path, FNV1_32_INIT); 6686bc1e9cdSJohn Baldwin sx_xlock(&ksem_dict_lock); 6696bc1e9cdSJohn Baldwin error = ksem_remove(path, fnv, td->td_ucred); 6706bc1e9cdSJohn Baldwin sx_xunlock(&ksem_dict_lock); 6716bc1e9cdSJohn Baldwin free(path, M_TEMP); 6726bc1e9cdSJohn Baldwin 673efaa6588SAlfred Perlstein return (error); 674efaa6588SAlfred Perlstein } 675efaa6588SAlfred Perlstein 676efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 677efaa6588SAlfred Perlstein struct ksem_close_args { 678efaa6588SAlfred Perlstein semid_t id; 679efaa6588SAlfred Perlstein }; 680efaa6588SAlfred Perlstein #endif 681efaa6588SAlfred Perlstein int 682efaa6588SAlfred Perlstein ksem_close(struct thread *td, struct ksem_close_args *uap) 683efaa6588SAlfred Perlstein { 684efaa6588SAlfred Perlstein struct ksem *ks; 6856bc1e9cdSJohn Baldwin struct file *fp; 686efaa6588SAlfred Perlstein int error; 687efaa6588SAlfred Perlstein 688a9d2f8d8SRobert Watson /* No capability rights required to close a semaphore. */ 689a9d2f8d8SRobert Watson error = ksem_get(td, uap->id, 0, &fp); 6906bc1e9cdSJohn Baldwin if (error) 6916bc1e9cdSJohn Baldwin return (error); 6926bc1e9cdSJohn Baldwin ks = fp->f_data; 6936bc1e9cdSJohn Baldwin if (ks->ks_flags & KS_ANONYMOUS) { 6946bc1e9cdSJohn Baldwin fdrop(fp, td); 6956bc1e9cdSJohn Baldwin return (EINVAL); 6966bc1e9cdSJohn Baldwin } 6976bc1e9cdSJohn Baldwin error = kern_close(td, uap->id); 6986bc1e9cdSJohn Baldwin fdrop(fp, td); 699b3890a1cSAlfred Perlstein return (error); 700efaa6588SAlfred Perlstein } 701efaa6588SAlfred Perlstein 702efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 703efaa6588SAlfred Perlstein struct ksem_post_args { 704efaa6588SAlfred Perlstein semid_t id; 705efaa6588SAlfred Perlstein }; 706efaa6588SAlfred Perlstein #endif 707efaa6588SAlfred Perlstein int 708c1250af6SRobert Watson ksem_post(struct thread *td, struct ksem_post_args *uap) 709efaa6588SAlfred Perlstein { 7106bc1e9cdSJohn Baldwin struct file *fp; 711efaa6588SAlfred Perlstein struct ksem *ks; 712efaa6588SAlfred Perlstein int error; 713efaa6588SAlfred Perlstein 714a9d2f8d8SRobert Watson error = ksem_get(td, uap->id, CAP_SEM_POST, &fp); 7156bc1e9cdSJohn Baldwin if (error) 7166bc1e9cdSJohn Baldwin return (error); 7176bc1e9cdSJohn Baldwin ks = fp->f_data; 7186bc1e9cdSJohn Baldwin 719efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 72052648411SRobert Watson #ifdef MAC 7216bc1e9cdSJohn Baldwin error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks); 72252648411SRobert Watson if (error) 72352648411SRobert Watson goto err; 72452648411SRobert Watson #endif 725efaa6588SAlfred Perlstein if (ks->ks_value == SEM_VALUE_MAX) { 726efaa6588SAlfred Perlstein error = EOVERFLOW; 727efaa6588SAlfred Perlstein goto err; 728efaa6588SAlfred Perlstein } 729efaa6588SAlfred Perlstein ++ks->ks_value; 730efaa6588SAlfred Perlstein if (ks->ks_waiters > 0) 731efaa6588SAlfred Perlstein cv_signal(&ks->ks_cv); 732efaa6588SAlfred Perlstein error = 0; 7336bc1e9cdSJohn Baldwin vfs_timestamp(&ks->ks_ctime); 734efaa6588SAlfred Perlstein err: 735efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 7366bc1e9cdSJohn Baldwin fdrop(fp, td); 737efaa6588SAlfred Perlstein return (error); 738efaa6588SAlfred Perlstein } 739efaa6588SAlfred Perlstein 740efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 741efaa6588SAlfred Perlstein struct ksem_wait_args { 742efaa6588SAlfred Perlstein semid_t id; 743efaa6588SAlfred Perlstein }; 744efaa6588SAlfred Perlstein #endif 745efaa6588SAlfred Perlstein int 746c1250af6SRobert Watson ksem_wait(struct thread *td, struct ksem_wait_args *uap) 747efaa6588SAlfred Perlstein { 748efaa6588SAlfred Perlstein 749aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, NULL)); 750aae94fbbSDaniel Eischen } 751aae94fbbSDaniel Eischen 752aae94fbbSDaniel Eischen #ifndef _SYS_SYSPROTO_H_ 753aae94fbbSDaniel Eischen struct ksem_timedwait_args { 754aae94fbbSDaniel Eischen semid_t id; 755d60e86c8SStefan Farfeleder const struct timespec *abstime; 756aae94fbbSDaniel Eischen }; 757aae94fbbSDaniel Eischen #endif 758aae94fbbSDaniel Eischen int 759c1250af6SRobert Watson ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap) 760aae94fbbSDaniel Eischen { 761aae94fbbSDaniel Eischen struct timespec abstime; 762aae94fbbSDaniel Eischen struct timespec *ts; 763aae94fbbSDaniel Eischen int error; 764aae94fbbSDaniel Eischen 7658e230e30SRobert Watson /* 7668e230e30SRobert Watson * We allow a null timespec (wait forever). 7678e230e30SRobert Watson */ 768aae94fbbSDaniel Eischen if (uap->abstime == NULL) 769aae94fbbSDaniel Eischen ts = NULL; 770aae94fbbSDaniel Eischen else { 771aae94fbbSDaniel Eischen error = copyin(uap->abstime, &abstime, sizeof(abstime)); 772aae94fbbSDaniel Eischen if (error != 0) 773aae94fbbSDaniel Eischen return (error); 774aae94fbbSDaniel Eischen if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 775aae94fbbSDaniel Eischen return (EINVAL); 776aae94fbbSDaniel Eischen ts = &abstime; 777aae94fbbSDaniel Eischen } 778aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 0, ts)); 779efaa6588SAlfred Perlstein } 780efaa6588SAlfred Perlstein 781efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 782efaa6588SAlfred Perlstein struct ksem_trywait_args { 783efaa6588SAlfred Perlstein semid_t id; 784efaa6588SAlfred Perlstein }; 785efaa6588SAlfred Perlstein #endif 786efaa6588SAlfred Perlstein int 787c1250af6SRobert Watson ksem_trywait(struct thread *td, struct ksem_trywait_args *uap) 788efaa6588SAlfred Perlstein { 789efaa6588SAlfred Perlstein 790aae94fbbSDaniel Eischen return (kern_sem_wait(td, uap->id, 1, NULL)); 791efaa6588SAlfred Perlstein } 792efaa6588SAlfred Perlstein 793c3053131SPoul-Henning Kamp static int 794c1250af6SRobert Watson kern_sem_wait(struct thread *td, semid_t id, int tryflag, 795c1250af6SRobert Watson struct timespec *abstime) 796efaa6588SAlfred Perlstein { 797aae94fbbSDaniel Eischen struct timespec ts1, ts2; 798aae94fbbSDaniel Eischen struct timeval tv; 7996bc1e9cdSJohn Baldwin struct file *fp; 800efaa6588SAlfred Perlstein struct ksem *ks; 801efaa6588SAlfred Perlstein int error; 802efaa6588SAlfred Perlstein 803b2966a5aSBruce M Simpson DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid)); 804a9d2f8d8SRobert Watson error = ksem_get(td, id, CAP_SEM_WAIT, &fp); 8056bc1e9cdSJohn Baldwin if (error) 8066bc1e9cdSJohn Baldwin return (error); 8076bc1e9cdSJohn Baldwin ks = fp->f_data; 808efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 809b2966a5aSBruce M Simpson DP((">>> kern_sem_wait critical section entered! pid=%d\n", 810b2966a5aSBruce M Simpson (int)td->td_proc->p_pid)); 81152648411SRobert Watson #ifdef MAC 8126bc1e9cdSJohn Baldwin error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks); 81352648411SRobert Watson if (error) { 81452648411SRobert Watson DP(("kern_sem_wait mac failed\n")); 81552648411SRobert Watson goto err; 81652648411SRobert Watson } 81752648411SRobert Watson #endif 818c814aa3fSAlfred Perlstein DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); 8196bc1e9cdSJohn Baldwin vfs_timestamp(&ks->ks_atime); 82077d8bf9cSBruce M Simpson while (ks->ks_value == 0) { 821efaa6588SAlfred Perlstein ks->ks_waiters++; 822aae94fbbSDaniel Eischen if (tryflag != 0) 823aae94fbbSDaniel Eischen error = EAGAIN; 824aae94fbbSDaniel Eischen else if (abstime == NULL) 825aae94fbbSDaniel Eischen error = cv_wait_sig(&ks->ks_cv, &sem_lock); 826aae94fbbSDaniel Eischen else { 827aae94fbbSDaniel Eischen for (;;) { 828aae94fbbSDaniel Eischen ts1 = *abstime; 829aae94fbbSDaniel Eischen getnanotime(&ts2); 830aae94fbbSDaniel Eischen timespecsub(&ts1, &ts2); 831aae94fbbSDaniel Eischen TIMESPEC_TO_TIMEVAL(&tv, &ts1); 832aae94fbbSDaniel Eischen if (tv.tv_sec < 0) { 833aae94fbbSDaniel Eischen error = ETIMEDOUT; 834aae94fbbSDaniel Eischen break; 835aae94fbbSDaniel Eischen } 836aae94fbbSDaniel Eischen error = cv_timedwait_sig(&ks->ks_cv, 837aae94fbbSDaniel Eischen &sem_lock, tvtohz(&tv)); 838aae94fbbSDaniel Eischen if (error != EWOULDBLOCK) 839aae94fbbSDaniel Eischen break; 840aae94fbbSDaniel Eischen } 841aae94fbbSDaniel Eischen } 842efaa6588SAlfred Perlstein ks->ks_waiters--; 843efaa6588SAlfred Perlstein if (error) 844efaa6588SAlfred Perlstein goto err; 845efaa6588SAlfred Perlstein } 846efaa6588SAlfred Perlstein ks->ks_value--; 847b2966a5aSBruce M Simpson DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value)); 848efaa6588SAlfred Perlstein error = 0; 849efaa6588SAlfred Perlstein err: 850efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 8516bc1e9cdSJohn Baldwin fdrop(fp, td); 852b2966a5aSBruce M Simpson DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n", 853b2966a5aSBruce M Simpson (int)td->td_proc->p_pid, error)); 854efaa6588SAlfred Perlstein return (error); 855efaa6588SAlfred Perlstein } 856efaa6588SAlfred Perlstein 857efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 858efaa6588SAlfred Perlstein struct ksem_getvalue_args { 859efaa6588SAlfred Perlstein semid_t id; 860efaa6588SAlfred Perlstein int *val; 861efaa6588SAlfred Perlstein }; 862efaa6588SAlfred Perlstein #endif 863efaa6588SAlfred Perlstein int 864c1250af6SRobert Watson ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap) 865efaa6588SAlfred Perlstein { 8666bc1e9cdSJohn Baldwin struct file *fp; 867efaa6588SAlfred Perlstein struct ksem *ks; 868efaa6588SAlfred Perlstein int error, val; 869efaa6588SAlfred Perlstein 870a9d2f8d8SRobert Watson error = ksem_get(td, uap->id, CAP_SEM_GETVALUE, &fp); 8716bc1e9cdSJohn Baldwin if (error) 8726bc1e9cdSJohn Baldwin return (error); 8736bc1e9cdSJohn Baldwin ks = fp->f_data; 8746bc1e9cdSJohn Baldwin 875efaa6588SAlfred Perlstein mtx_lock(&sem_lock); 87652648411SRobert Watson #ifdef MAC 8776bc1e9cdSJohn Baldwin error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks); 87852648411SRobert Watson if (error) { 87952648411SRobert Watson mtx_unlock(&sem_lock); 8806bc1e9cdSJohn Baldwin fdrop(fp, td); 88152648411SRobert Watson return (error); 88252648411SRobert Watson } 88352648411SRobert Watson #endif 884efaa6588SAlfred Perlstein val = ks->ks_value; 8856bc1e9cdSJohn Baldwin vfs_timestamp(&ks->ks_atime); 886efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 8876bc1e9cdSJohn Baldwin fdrop(fp, td); 888efaa6588SAlfred Perlstein error = copyout(&val, uap->val, sizeof(val)); 889efaa6588SAlfred Perlstein return (error); 890efaa6588SAlfred Perlstein } 891efaa6588SAlfred Perlstein 892efaa6588SAlfred Perlstein #ifndef _SYS_SYSPROTO_H_ 893efaa6588SAlfred Perlstein struct ksem_destroy_args { 894efaa6588SAlfred Perlstein semid_t id; 895efaa6588SAlfred Perlstein }; 896efaa6588SAlfred Perlstein #endif 897efaa6588SAlfred Perlstein int 898c1250af6SRobert Watson ksem_destroy(struct thread *td, struct ksem_destroy_args *uap) 899efaa6588SAlfred Perlstein { 9006bc1e9cdSJohn Baldwin struct file *fp; 901efaa6588SAlfred Perlstein struct ksem *ks; 902efaa6588SAlfred Perlstein int error; 903efaa6588SAlfred Perlstein 904a9d2f8d8SRobert Watson /* No capability rights required to close a semaphore. */ 905a9d2f8d8SRobert Watson error = ksem_get(td, uap->id, 0, &fp); 9066bc1e9cdSJohn Baldwin if (error) 9076bc1e9cdSJohn Baldwin return (error); 9086bc1e9cdSJohn Baldwin ks = fp->f_data; 9096bc1e9cdSJohn Baldwin if (!(ks->ks_flags & KS_ANONYMOUS)) { 9106bc1e9cdSJohn Baldwin fdrop(fp, td); 9116bc1e9cdSJohn Baldwin return (EINVAL); 912efaa6588SAlfred Perlstein } 9136bc1e9cdSJohn Baldwin mtx_lock(&sem_lock); 914efaa6588SAlfred Perlstein if (ks->ks_waiters != 0) { 9156bc1e9cdSJohn Baldwin mtx_unlock(&sem_lock); 916efaa6588SAlfred Perlstein error = EBUSY; 917efaa6588SAlfred Perlstein goto err; 918efaa6588SAlfred Perlstein } 9196bc1e9cdSJohn Baldwin ks->ks_flags |= KS_DEAD; 920efaa6588SAlfred Perlstein mtx_unlock(&sem_lock); 9216bc1e9cdSJohn Baldwin 9226bc1e9cdSJohn Baldwin error = kern_close(td, uap->id); 9236bc1e9cdSJohn Baldwin err: 9246bc1e9cdSJohn Baldwin fdrop(fp, td); 925efaa6588SAlfred Perlstein return (error); 926efaa6588SAlfred Perlstein } 927efaa6588SAlfred Perlstein 9280e5d5bc2SKonstantin Belousov static struct syscall_helper_data ksem_syscalls[] = { 9290e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_init), 9300e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_open), 9310e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_unlink), 9320e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_close), 9330e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_post), 9340e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_wait), 9350e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_timedwait), 9360e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_trywait), 9370e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_getvalue), 9380e5d5bc2SKonstantin Belousov SYSCALL_INIT_HELPER(ksem_destroy), 9390e5d5bc2SKonstantin Belousov SYSCALL_INIT_LAST 9400e5d5bc2SKonstantin Belousov }; 9416bc1e9cdSJohn Baldwin 9420e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 9430e5d5bc2SKonstantin Belousov #include <compat/freebsd32/freebsd32.h> 9440e5d5bc2SKonstantin Belousov #include <compat/freebsd32/freebsd32_proto.h> 9450e5d5bc2SKonstantin Belousov #include <compat/freebsd32/freebsd32_signal.h> 9460e5d5bc2SKonstantin Belousov #include <compat/freebsd32/freebsd32_syscall.h> 9470e5d5bc2SKonstantin Belousov #include <compat/freebsd32/freebsd32_util.h> 9486bc1e9cdSJohn Baldwin 9490e5d5bc2SKonstantin Belousov int 9500e5d5bc2SKonstantin Belousov freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap) 9510e5d5bc2SKonstantin Belousov { 9526bc1e9cdSJohn Baldwin 9530e5d5bc2SKonstantin Belousov return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 9540e5d5bc2SKonstantin Belousov 0, 1)); 9550e5d5bc2SKonstantin Belousov } 9560e5d5bc2SKonstantin Belousov 9570e5d5bc2SKonstantin Belousov int 9580e5d5bc2SKonstantin Belousov freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap) 9590e5d5bc2SKonstantin Belousov { 9600e5d5bc2SKonstantin Belousov 9610e5d5bc2SKonstantin Belousov if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) 9620e5d5bc2SKonstantin Belousov return (EINVAL); 9630e5d5bc2SKonstantin Belousov return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, 9640e5d5bc2SKonstantin Belousov uap->oflag, 1)); 9650e5d5bc2SKonstantin Belousov } 9660e5d5bc2SKonstantin Belousov 9670e5d5bc2SKonstantin Belousov int 9680e5d5bc2SKonstantin Belousov freebsd32_ksem_timedwait(struct thread *td, 9690e5d5bc2SKonstantin Belousov struct freebsd32_ksem_timedwait_args *uap) 9700e5d5bc2SKonstantin Belousov { 9710e5d5bc2SKonstantin Belousov struct timespec32 abstime32; 9720e5d5bc2SKonstantin Belousov struct timespec *ts, abstime; 9730e5d5bc2SKonstantin Belousov int error; 9740e5d5bc2SKonstantin Belousov 9750e5d5bc2SKonstantin Belousov /* 9760e5d5bc2SKonstantin Belousov * We allow a null timespec (wait forever). 9770e5d5bc2SKonstantin Belousov */ 9780e5d5bc2SKonstantin Belousov if (uap->abstime == NULL) 9790e5d5bc2SKonstantin Belousov ts = NULL; 9800e5d5bc2SKonstantin Belousov else { 9810e5d5bc2SKonstantin Belousov error = copyin(uap->abstime, &abstime32, sizeof(abstime32)); 9820e5d5bc2SKonstantin Belousov if (error != 0) 9830e5d5bc2SKonstantin Belousov return (error); 9840e5d5bc2SKonstantin Belousov CP(abstime32, abstime, tv_sec); 9850e5d5bc2SKonstantin Belousov CP(abstime32, abstime, tv_nsec); 9860e5d5bc2SKonstantin Belousov if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) 9870e5d5bc2SKonstantin Belousov return (EINVAL); 9880e5d5bc2SKonstantin Belousov ts = &abstime; 9890e5d5bc2SKonstantin Belousov } 9900e5d5bc2SKonstantin Belousov return (kern_sem_wait(td, uap->id, 0, ts)); 9910e5d5bc2SKonstantin Belousov } 9920e5d5bc2SKonstantin Belousov 9930e5d5bc2SKonstantin Belousov static struct syscall_helper_data ksem32_syscalls[] = { 9940e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(freebsd32_ksem_init), 9950e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(freebsd32_ksem_open), 9960e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_unlink), 9970e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_close), 9980e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_post), 9990e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_wait), 10000e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait), 10010e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_trywait), 10020e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_getvalue), 10030e5d5bc2SKonstantin Belousov SYSCALL32_INIT_HELPER(ksem_destroy), 10040e5d5bc2SKonstantin Belousov SYSCALL_INIT_LAST 10050e5d5bc2SKonstantin Belousov }; 10060e5d5bc2SKonstantin Belousov #endif 10076bc1e9cdSJohn Baldwin 1008590f242cSRobert Watson static int 10096bc1e9cdSJohn Baldwin ksem_module_init(void) 1010590f242cSRobert Watson { 10116bc1e9cdSJohn Baldwin int error; 1012590f242cSRobert Watson 10136bc1e9cdSJohn Baldwin mtx_init(&sem_lock, "sem", NULL, MTX_DEF); 10146bc1e9cdSJohn Baldwin mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF); 10156bc1e9cdSJohn Baldwin sx_init(&ksem_dict_lock, "ksem dictionary"); 10166bc1e9cdSJohn Baldwin ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash); 10172e7758a8SJohn Baldwin p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L); 10186bc1e9cdSJohn Baldwin p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX); 10196bc1e9cdSJohn Baldwin p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX); 1020590f242cSRobert Watson 10210e5d5bc2SKonstantin Belousov error = syscall_helper_register(ksem_syscalls); 10220e5d5bc2SKonstantin Belousov if (error) 10230e5d5bc2SKonstantin Belousov return (error); 10240e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 10250e5d5bc2SKonstantin Belousov error = syscall32_helper_register(ksem32_syscalls); 10260e5d5bc2SKonstantin Belousov if (error) 10270e5d5bc2SKonstantin Belousov return (error); 10280e5d5bc2SKonstantin Belousov #endif 10296bc1e9cdSJohn Baldwin return (0); 1030590f242cSRobert Watson } 1031590f242cSRobert Watson 1032c3053131SPoul-Henning Kamp static void 10336bc1e9cdSJohn Baldwin ksem_module_destroy(void) 1034993182e5SAlexander Leidinger { 1035993182e5SAlexander Leidinger 10360e5d5bc2SKonstantin Belousov #ifdef COMPAT_FREEBSD32 10370e5d5bc2SKonstantin Belousov syscall32_helper_unregister(ksem32_syscalls); 10380e5d5bc2SKonstantin Belousov #endif 10390e5d5bc2SKonstantin Belousov syscall_helper_unregister(ksem_syscalls); 1040efaa6588SAlfred Perlstein 10412e7758a8SJohn Baldwin p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0); 10426bc1e9cdSJohn Baldwin hashdestroy(ksem_dictionary, M_KSEM, ksem_hash); 10436bc1e9cdSJohn Baldwin sx_destroy(&ksem_dict_lock); 10446bc1e9cdSJohn Baldwin mtx_destroy(&ksem_count_lock); 10456bc1e9cdSJohn Baldwin mtx_destroy(&sem_lock); 104632863754SKonstantin Belousov p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX); 104732863754SKonstantin Belousov p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX); 1048efaa6588SAlfred Perlstein } 1049efaa6588SAlfred Perlstein 1050efaa6588SAlfred Perlstein static int 1051efaa6588SAlfred Perlstein sem_modload(struct module *module, int cmd, void *arg) 1052efaa6588SAlfred Perlstein { 1053efaa6588SAlfred Perlstein int error = 0; 1054efaa6588SAlfred Perlstein 1055efaa6588SAlfred Perlstein switch (cmd) { 1056efaa6588SAlfred Perlstein case MOD_LOAD: 10576bc1e9cdSJohn Baldwin error = ksem_module_init(); 10586bc1e9cdSJohn Baldwin if (error) 10596bc1e9cdSJohn Baldwin ksem_module_destroy(); 1060efaa6588SAlfred Perlstein break; 10618e230e30SRobert Watson 1062efaa6588SAlfred Perlstein case MOD_UNLOAD: 10636bc1e9cdSJohn Baldwin mtx_lock(&ksem_count_lock); 1064efaa6588SAlfred Perlstein if (nsems != 0) { 1065efaa6588SAlfred Perlstein error = EOPNOTSUPP; 10666bc1e9cdSJohn Baldwin mtx_unlock(&ksem_count_lock); 1067efaa6588SAlfred Perlstein break; 1068efaa6588SAlfred Perlstein } 10696bc1e9cdSJohn Baldwin ksem_dead = 1; 10706bc1e9cdSJohn Baldwin mtx_unlock(&ksem_count_lock); 10716bc1e9cdSJohn Baldwin ksem_module_destroy(); 1072efaa6588SAlfred Perlstein break; 10738e230e30SRobert Watson 1074efaa6588SAlfred Perlstein case MOD_SHUTDOWN: 1075efaa6588SAlfred Perlstein break; 1076efaa6588SAlfred Perlstein default: 1077efaa6588SAlfred Perlstein error = EINVAL; 1078efaa6588SAlfred Perlstein break; 1079efaa6588SAlfred Perlstein } 1080efaa6588SAlfred Perlstein return (error); 1081efaa6588SAlfred Perlstein } 1082efaa6588SAlfred Perlstein 1083efaa6588SAlfred Perlstein static moduledata_t sem_mod = { 1084efaa6588SAlfred Perlstein "sem", 1085efaa6588SAlfred Perlstein &sem_modload, 1086efaa6588SAlfred Perlstein NULL 1087efaa6588SAlfred Perlstein }; 1088efaa6588SAlfred Perlstein 1089efaa6588SAlfred Perlstein DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST); 1090efaa6588SAlfred Perlstein MODULE_VERSION(sem, 1); 1091