diff options
Diffstat (limited to 'sys/kern/sysv_shm.c')
-rw-r--r-- | sys/kern/sysv_shm.c | 1406 |
1 files changed, 1406 insertions, 0 deletions
diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c new file mode 100644 index 0000000..5c35514 --- /dev/null +++ b/sys/kern/sysv_shm.c @@ -0,0 +1,1406 @@ +/* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */ +/*- + * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Adam Glass and Charles + * Hannum. + * 4. The names of the authors may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +/*- + * Copyright (c) 2003-2005 McAfee, Inc. + * All rights reserved. + * + * This software was developed for the FreeBSD Project in part by McAfee + * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR + * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research + * program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_compat.h" +#include "opt_sysvipc.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/sysctl.h> +#include <sys/shm.h> +#include <sys/proc.h> +#include <sys/malloc.h> +#include <sys/mman.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/racct.h> +#include <sys/resourcevar.h> +#include <sys/stat.h> +#include <sys/syscall.h> +#include <sys/syscallsubr.h> +#include <sys/sysent.h> +#include <sys/sysproto.h> +#include <sys/jail.h> + +#include <security/mac/mac_framework.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> +#include <vm/vm_object.h> +#include <vm/vm_map.h> +#include <vm/vm_page.h> +#include <vm/vm_pager.h> + +FEATURE(sysv_shm, "System V shared memory segments support"); + +static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); + +static int shmget_allocate_segment(struct thread *td, + struct shmget_args *uap, int mode); +static int shmget_existing(struct thread *td, struct shmget_args *uap, + int mode, int segnum); + +#define SHMSEG_FREE 0x0200 +#define SHMSEG_REMOVED 0x0400 +#define SHMSEG_ALLOCATED 0x0800 +#define SHMSEG_WANTED 0x1000 + +static int shm_last_free, shm_nused, shmalloced; +vm_size_t shm_committed; +static struct shmid_kernel *shmsegs; + +struct shmmap_state { + vm_offset_t va; + int shmid; +}; + +static void shm_deallocate_segment(struct shmid_kernel *); +static int shm_find_segment_by_key(key_t); +static struct shmid_kernel *shm_find_segment_by_shmid(int); +static struct shmid_kernel *shm_find_segment_by_shmidx(int); +static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *); +static void shmrealloc(void); +static int shminit(void); +static int sysvshm_modload(struct module *, int, void *); +static int shmunload(void); +static void shmexit_myhook(struct vmspace *vm); +static void shmfork_myhook(struct proc *p1, struct proc *p2); +static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS); + +/* + * Tuneable values. + */ +#ifndef SHMMAXPGS +#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ +#endif +#ifndef SHMMAX +#define SHMMAX (SHMMAXPGS*PAGE_SIZE) +#endif +#ifndef SHMMIN +#define SHMMIN 1 +#endif +#ifndef SHMMNI +#define SHMMNI 192 +#endif +#ifndef SHMSEG +#define SHMSEG 128 +#endif +#ifndef SHMALL +#define SHMALL (SHMMAXPGS) +#endif + +struct shminfo shminfo = { + SHMMAX, + SHMMIN, + SHMMNI, + SHMSEG, + SHMALL +}; + +static int shm_use_phys; +static int shm_allow_removed; + +SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0, + "Maximum shared memory segment size"); +SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0, + "Minimum shared memory segment size"); +SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, + "Number of shared memory identifiers"); +SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, + "Number of segments per process"); +SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0, + "Maximum number of pages available for shared memory"); +SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW, + &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); +SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW, + &shm_allow_removed, 0, + "Enable/Disable attachment to attached segments marked for removal"); +SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD, + NULL, 0, sysctl_shmsegs, "", + "Current number of shared memory segments allocated"); + +static int +shm_find_segment_by_key(key) + key_t key; +{ + int i; + + for (i = 0; i < shmalloced; i++) + if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && + shmsegs[i].u.shm_perm.key == key) + return (i); + return (-1); +} + +static struct shmid_kernel * +shm_find_segment_by_shmid(int shmid) +{ + int segnum; + struct shmid_kernel *shmseg; + + segnum = IPCID_TO_IX(shmid); + if (segnum < 0 || segnum >= shmalloced) + return (NULL); + shmseg = &shmsegs[segnum]; + if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || + (!shm_allow_removed && + (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || + shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid)) + return (NULL); + return (shmseg); +} + +static struct shmid_kernel * +shm_find_segment_by_shmidx(int segnum) +{ + struct shmid_kernel *shmseg; + + if (segnum < 0 || segnum >= shmalloced) + return (NULL); + shmseg = &shmsegs[segnum]; + if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || + (!shm_allow_removed && + (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0)) + return (NULL); + return (shmseg); +} + +static void +shm_deallocate_segment(shmseg) + struct shmid_kernel *shmseg; +{ + vm_size_t size; + + GIANT_REQUIRED; + + vm_object_deallocate(shmseg->object); + shmseg->object = NULL; + size = round_page(shmseg->u.shm_segsz); + shm_committed -= btoc(size); + shm_nused--; + shmseg->u.shm_perm.mode = SHMSEG_FREE; +#ifdef MAC + mac_sysvshm_cleanup(shmseg); +#endif + racct_sub_cred(shmseg->cred, RACCT_NSHM, 1); + racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size); + crfree(shmseg->cred); + shmseg->cred = NULL; +} + +static int +shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) +{ + struct shmid_kernel *shmseg; + int segnum, result; + vm_size_t size; + + GIANT_REQUIRED; + + segnum = IPCID_TO_IX(shmmap_s->shmid); + shmseg = &shmsegs[segnum]; + size = round_page(shmseg->u.shm_segsz); + result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); + if (result != KERN_SUCCESS) + return (EINVAL); + shmmap_s->shmid = -1; + shmseg->u.shm_dtime = time_second; + if ((--shmseg->u.shm_nattch <= 0) && + (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { + shm_deallocate_segment(shmseg); + shm_last_free = segnum; + } + return (0); +} + +#ifndef _SYS_SYSPROTO_H_ +struct shmdt_args { + const void *shmaddr; +}; +#endif +int +sys_shmdt(td, uap) + struct thread *td; + struct shmdt_args *uap; +{ + struct proc *p = td->td_proc; + struct shmmap_state *shmmap_s; +#ifdef MAC + struct shmid_kernel *shmsegptr; +#endif + int i; + int error = 0; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + mtx_lock(&Giant); + shmmap_s = p->p_vmspace->vm_shm; + if (shmmap_s == NULL) { + error = EINVAL; + goto done2; + } + for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { + if (shmmap_s->shmid != -1 && + shmmap_s->va == (vm_offset_t)uap->shmaddr) { + break; + } + } + if (i == shminfo.shmseg) { + error = EINVAL; + goto done2; + } +#ifdef MAC + shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; + error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); + if (error != 0) + goto done2; +#endif + error = shm_delete_mapping(p->p_vmspace, shmmap_s); +done2: + mtx_unlock(&Giant); + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct shmat_args { + int shmid; + const void *shmaddr; + int shmflg; +}; +#endif +int +kern_shmat(td, shmid, shmaddr, shmflg) + struct thread *td; + int shmid; + const void *shmaddr; + int shmflg; +{ + struct proc *p = td->td_proc; + int i, flags; + struct shmid_kernel *shmseg; + struct shmmap_state *shmmap_s = NULL; + vm_offset_t attach_va; + vm_prot_t prot; + vm_size_t size; + int rv; + int error = 0; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + mtx_lock(&Giant); + shmmap_s = p->p_vmspace->vm_shm; + if (shmmap_s == NULL) { + shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), + M_SHM, M_WAITOK); + for (i = 0; i < shminfo.shmseg; i++) + shmmap_s[i].shmid = -1; + p->p_vmspace->vm_shm = shmmap_s; + } + shmseg = shm_find_segment_by_shmid(shmid); + if (shmseg == NULL) { + error = EINVAL; + goto done2; + } + error = ipcperm(td, &shmseg->u.shm_perm, + (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); + if (error) + goto done2; +#ifdef MAC + error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); + if (error != 0) + goto done2; +#endif + for (i = 0; i < shminfo.shmseg; i++) { + if (shmmap_s->shmid == -1) + break; + shmmap_s++; + } + if (i >= shminfo.shmseg) { + error = EMFILE; + goto done2; + } + size = round_page(shmseg->u.shm_segsz); + prot = VM_PROT_READ; + if ((shmflg & SHM_RDONLY) == 0) + prot |= VM_PROT_WRITE; + flags = MAP_ANON | MAP_SHARED; + if (shmaddr) { + flags |= MAP_FIXED; + if (shmflg & SHM_RND) { + attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); + } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) { + attach_va = (vm_offset_t)shmaddr; + } else { + error = EINVAL; + goto done2; + } + } else { + /* + * This is just a hint to vm_map_find() about where to + * put it. + */ + PROC_LOCK(p); + attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + + lim_max(p, RLIMIT_DATA)); + PROC_UNLOCK(p); + } + + vm_object_reference(shmseg->object); + rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, + 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE : + VMFS_ANY_SPACE, prot, prot, MAP_INHERIT_SHARE); + if (rv != KERN_SUCCESS) { + vm_object_deallocate(shmseg->object); + error = ENOMEM; + goto done2; + } + + shmmap_s->va = attach_va; + shmmap_s->shmid = shmid; + shmseg->u.shm_lpid = p->p_pid; + shmseg->u.shm_atime = time_second; + shmseg->u.shm_nattch++; + td->td_retval[0] = attach_va; +done2: + mtx_unlock(&Giant); + return (error); +} + +int +sys_shmat(td, uap) + struct thread *td; + struct shmat_args *uap; +{ + return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg); +} + +int +kern_shmctl(td, shmid, cmd, buf, bufsz) + struct thread *td; + int shmid; + int cmd; + void *buf; + size_t *bufsz; +{ + int error = 0; + struct shmid_kernel *shmseg; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + + mtx_lock(&Giant); + switch (cmd) { + /* + * It is possible that kern_shmctl is being called from the Linux ABI + * layer, in which case, we will need to implement IPC_INFO. It should + * be noted that other shmctl calls will be funneled through here for + * Linix binaries as well. + * + * NB: The Linux ABI layer will convert this data to structure(s) more + * consistent with the Linux ABI. + */ + case IPC_INFO: + memcpy(buf, &shminfo, sizeof(shminfo)); + if (bufsz) + *bufsz = sizeof(shminfo); + td->td_retval[0] = shmalloced; + goto done2; + case SHM_INFO: { + struct shm_info shm_info; + shm_info.used_ids = shm_nused; + shm_info.shm_rss = 0; /*XXX where to get from ? */ + shm_info.shm_tot = 0; /*XXX where to get from ? */ + shm_info.shm_swp = 0; /*XXX where to get from ? */ + shm_info.swap_attempts = 0; /*XXX where to get from ? */ + shm_info.swap_successes = 0; /*XXX where to get from ? */ + memcpy(buf, &shm_info, sizeof(shm_info)); + if (bufsz) + *bufsz = sizeof(shm_info); + td->td_retval[0] = shmalloced; + goto done2; + } + } + if (cmd == SHM_STAT) + shmseg = shm_find_segment_by_shmidx(shmid); + else + shmseg = shm_find_segment_by_shmid(shmid); + if (shmseg == NULL) { + error = EINVAL; + goto done2; + } +#ifdef MAC + error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); + if (error != 0) + goto done2; +#endif + switch (cmd) { + case SHM_STAT: + case IPC_STAT: + error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); + if (error) + goto done2; + memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); + if (bufsz) + *bufsz = sizeof(struct shmid_ds); + if (cmd == SHM_STAT) + td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm); + break; + case IPC_SET: { + struct shmid_ds *shmid; + + shmid = (struct shmid_ds *)buf; + error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); + if (error) + goto done2; + shmseg->u.shm_perm.uid = shmid->shm_perm.uid; + shmseg->u.shm_perm.gid = shmid->shm_perm.gid; + shmseg->u.shm_perm.mode = + (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | + (shmid->shm_perm.mode & ACCESSPERMS); + shmseg->u.shm_ctime = time_second; + break; + } + case IPC_RMID: + error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); + if (error) + goto done2; + shmseg->u.shm_perm.key = IPC_PRIVATE; + shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; + if (shmseg->u.shm_nattch <= 0) { + shm_deallocate_segment(shmseg); + shm_last_free = IPCID_TO_IX(shmid); + } + break; +#if 0 + case SHM_LOCK: + case SHM_UNLOCK: +#endif + default: + error = EINVAL; + break; + } +done2: + mtx_unlock(&Giant); + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct shmctl_args { + int shmid; + int cmd; + struct shmid_ds *buf; +}; +#endif +int +sys_shmctl(td, uap) + struct thread *td; + struct shmctl_args *uap; +{ + int error = 0; + struct shmid_ds buf; + size_t bufsz; + + /* + * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support + * Linux binaries. If we see the call come through the FreeBSD ABI, + * return an error back to the user since we do not to support this. + */ + if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || + uap->cmd == SHM_STAT) + return (EINVAL); + + /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ + if (uap->cmd == IPC_SET) { + if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) + goto done; + } + + error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); + if (error) + goto done; + + /* Cases in which we need to copyout */ + switch (uap->cmd) { + case IPC_STAT: + error = copyout(&buf, uap->buf, bufsz); + break; + } + +done: + if (error) { + /* Invalidate the return value */ + td->td_retval[0] = -1; + } + return (error); +} + + +static int +shmget_existing(td, uap, mode, segnum) + struct thread *td; + struct shmget_args *uap; + int mode; + int segnum; +{ + struct shmid_kernel *shmseg; + int error; + + shmseg = &shmsegs[segnum]; + if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) { + /* + * This segment is in the process of being allocated. Wait + * until it's done, and look the key up again (in case the + * allocation failed or it was freed). + */ + shmseg->u.shm_perm.mode |= SHMSEG_WANTED; + error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0); + if (error) + return (error); + return (EAGAIN); + } + if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) + return (EEXIST); +#ifdef MAC + error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); + if (error != 0) + return (error); +#endif + if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) + return (EINVAL); + td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); + return (0); +} + +static int +shmget_allocate_segment(td, uap, mode) + struct thread *td; + struct shmget_args *uap; + int mode; +{ + int i, segnum, shmid; + size_t size; + struct ucred *cred = td->td_ucred; + struct shmid_kernel *shmseg; + vm_object_t shm_object; + + GIANT_REQUIRED; + + if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) + return (EINVAL); + if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ + return (ENOSPC); + size = round_page(uap->size); + if (shm_committed + btoc(size) > shminfo.shmall) + return (ENOMEM); + if (shm_last_free < 0) { + shmrealloc(); /* Maybe expand the shmsegs[] array. */ + for (i = 0; i < shmalloced; i++) + if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) + break; + if (i == shmalloced) + return (ENOSPC); + segnum = i; + } else { + segnum = shm_last_free; + shm_last_free = -1; + } + shmseg = &shmsegs[segnum]; +#ifdef RACCT + PROC_LOCK(td->td_proc); + if (racct_add(td->td_proc, RACCT_NSHM, 1)) { + PROC_UNLOCK(td->td_proc); + return (ENOSPC); + } + if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { + racct_sub(td->td_proc, RACCT_NSHM, 1); + PROC_UNLOCK(td->td_proc); + return (ENOMEM); + } + PROC_UNLOCK(td->td_proc); +#endif + /* + * In case we sleep in malloc(), mark the segment present but deleted + * so that noone else tries to create the same key. + */ + shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; + shmseg->u.shm_perm.key = uap->key; + shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; + shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); + + /* + * We make sure that we have allocated a pager before we need + * to. + */ + shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, + 0, size, VM_PROT_DEFAULT, 0, cred); + if (shm_object == NULL) { +#ifdef RACCT + PROC_LOCK(td->td_proc); + racct_sub(td->td_proc, RACCT_NSHM, 1); + racct_sub(td->td_proc, RACCT_SHMSIZE, size); + PROC_UNLOCK(td->td_proc); +#endif + return (ENOMEM); + } + VM_OBJECT_LOCK(shm_object); + vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); + vm_object_set_flag(shm_object, OBJ_NOSPLIT); + VM_OBJECT_UNLOCK(shm_object); + + shmseg->object = shm_object; + shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; + shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; + shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) | + (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; + shmseg->cred = crhold(cred); + shmseg->u.shm_segsz = uap->size; + shmseg->u.shm_cpid = td->td_proc->p_pid; + shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; + shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; +#ifdef MAC + mac_sysvshm_create(cred, shmseg); +#endif + shmseg->u.shm_ctime = time_second; + shm_committed += btoc(size); + shm_nused++; + if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) { + /* + * Somebody else wanted this key while we were asleep. Wake + * them up now. + */ + shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED; + wakeup(shmseg); + } + td->td_retval[0] = shmid; + return (0); +} + +#ifndef _SYS_SYSPROTO_H_ +struct shmget_args { + key_t key; + size_t size; + int shmflg; +}; +#endif +int +sys_shmget(td, uap) + struct thread *td; + struct shmget_args *uap; +{ + int segnum, mode; + int error; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + mtx_lock(&Giant); + mode = uap->shmflg & ACCESSPERMS; + if (uap->key != IPC_PRIVATE) { + again: + segnum = shm_find_segment_by_key(uap->key); + if (segnum >= 0) { + error = shmget_existing(td, uap, mode, segnum); + if (error == EAGAIN) + goto again; + goto done2; + } + if ((uap->shmflg & IPC_CREAT) == 0) { + error = ENOENT; + goto done2; + } + } + error = shmget_allocate_segment(td, uap, mode); +done2: + mtx_unlock(&Giant); + return (error); +} + +static void +shmfork_myhook(p1, p2) + struct proc *p1, *p2; +{ + struct shmmap_state *shmmap_s; + size_t size; + int i; + + mtx_lock(&Giant); + size = shminfo.shmseg * sizeof(struct shmmap_state); + shmmap_s = malloc(size, M_SHM, M_WAITOK); + bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); + p2->p_vmspace->vm_shm = shmmap_s; + for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) + if (shmmap_s->shmid != -1) + shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; + mtx_unlock(&Giant); +} + +static void +shmexit_myhook(struct vmspace *vm) +{ + struct shmmap_state *base, *shm; + int i; + + if ((base = vm->vm_shm) != NULL) { + vm->vm_shm = NULL; + mtx_lock(&Giant); + for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { + if (shm->shmid != -1) + shm_delete_mapping(vm, shm); + } + mtx_unlock(&Giant); + free(base, M_SHM); + } +} + +static void +shmrealloc(void) +{ + int i; + struct shmid_kernel *newsegs; + + if (shmalloced >= shminfo.shmmni) + return; + + newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); + if (newsegs == NULL) + return; + for (i = 0; i < shmalloced; i++) + bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); + for (; i < shminfo.shmmni; i++) { + shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; + shmsegs[i].u.shm_perm.seq = 0; +#ifdef MAC + mac_sysvshm_init(&shmsegs[i]); +#endif + } + free(shmsegs, M_SHM); + shmsegs = newsegs; + shmalloced = shminfo.shmmni; +} + +static struct syscall_helper_data shm_syscalls[] = { + SYSCALL_INIT_HELPER(shmat), + SYSCALL_INIT_HELPER(shmctl), + SYSCALL_INIT_HELPER(shmdt), + SYSCALL_INIT_HELPER(shmget), +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) + SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), +#endif +#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) + SYSCALL_INIT_HELPER(shmsys), +#endif + SYSCALL_INIT_LAST +}; + +#ifdef COMPAT_FREEBSD32 +#include <compat/freebsd32/freebsd32.h> +#include <compat/freebsd32/freebsd32_ipc.h> +#include <compat/freebsd32/freebsd32_proto.h> +#include <compat/freebsd32/freebsd32_signal.h> +#include <compat/freebsd32/freebsd32_syscall.h> +#include <compat/freebsd32/freebsd32_util.h> + +static struct syscall_helper_data shm32_syscalls[] = { + SYSCALL32_INIT_HELPER_COMPAT(shmat), + SYSCALL32_INIT_HELPER_COMPAT(shmdt), + SYSCALL32_INIT_HELPER_COMPAT(shmget), + SYSCALL32_INIT_HELPER(freebsd32_shmsys), + SYSCALL32_INIT_HELPER(freebsd32_shmctl), +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) + SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), +#endif + SYSCALL_INIT_LAST +}; +#endif + +static int +shminit() +{ + int i, error; + +#ifndef BURN_BRIDGES + if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) + printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); +#endif + TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall); + if (!TUNABLE_ULONG_FETCH("kern.ipc.shmmax", &shminfo.shmmax)) { + /* Initialize shmmax dealing with possible overflow. */ + for (i = PAGE_SIZE; i > 0; i--) { + shminfo.shmmax = shminfo.shmall * i; + if (shminfo.shmmax >= shminfo.shmall) + break; + } + } + TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin); + TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni); + TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg); + TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys); + + shmalloced = shminfo.shmmni; + shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); + for (i = 0; i < shmalloced; i++) { + shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; + shmsegs[i].u.shm_perm.seq = 0; +#ifdef MAC + mac_sysvshm_init(&shmsegs[i]); +#endif + } + shm_last_free = 0; + shm_nused = 0; + shm_committed = 0; + shmexit_hook = &shmexit_myhook; + shmfork_hook = &shmfork_myhook; + + error = syscall_helper_register(shm_syscalls); + if (error != 0) + return (error); +#ifdef COMPAT_FREEBSD32 + error = syscall32_helper_register(shm32_syscalls); + if (error != 0) + return (error); +#endif + return (0); +} + +static int +shmunload() +{ + int i; + + if (shm_nused > 0) + return (EBUSY); + +#ifdef COMPAT_FREEBSD32 + syscall32_helper_unregister(shm32_syscalls); +#endif + syscall_helper_unregister(shm_syscalls); + + for (i = 0; i < shmalloced; i++) { +#ifdef MAC + mac_sysvshm_destroy(&shmsegs[i]); +#endif + /* + * Objects might be still mapped into the processes + * address spaces. Actual free would happen on the + * last mapping destruction. + */ + if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) + vm_object_deallocate(shmsegs[i].object); + } + free(shmsegs, M_SHM); + shmexit_hook = NULL; + shmfork_hook = NULL; + return (0); +} + +static int +sysctl_shmsegs(SYSCTL_HANDLER_ARGS) +{ + + return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0]))); +} + +#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) +struct oshmid_ds { + struct ipc_perm_old shm_perm; /* operation perms */ + int shm_segsz; /* size of segment (bytes) */ + u_short shm_cpid; /* pid, creator */ + u_short shm_lpid; /* pid, last operation */ + short shm_nattch; /* no. of current attaches */ + time_t shm_atime; /* last attach time */ + time_t shm_dtime; /* last detach time */ + time_t shm_ctime; /* last change time */ + void *shm_handle; /* internal handle for shm segment */ +}; + +struct oshmctl_args { + int shmid; + int cmd; + struct oshmid_ds *ubuf; +}; + +static int +oshmctl(struct thread *td, struct oshmctl_args *uap) +{ +#ifdef COMPAT_43 + int error = 0; + struct shmid_kernel *shmseg; + struct oshmid_ds outbuf; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + mtx_lock(&Giant); + shmseg = shm_find_segment_by_shmid(uap->shmid); + if (shmseg == NULL) { + error = EINVAL; + goto done2; + } + switch (uap->cmd) { + case IPC_STAT: + error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); + if (error) + goto done2; +#ifdef MAC + error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); + if (error != 0) + goto done2; +#endif + ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); + outbuf.shm_segsz = shmseg->u.shm_segsz; + outbuf.shm_cpid = shmseg->u.shm_cpid; + outbuf.shm_lpid = shmseg->u.shm_lpid; + outbuf.shm_nattch = shmseg->u.shm_nattch; + outbuf.shm_atime = shmseg->u.shm_atime; + outbuf.shm_dtime = shmseg->u.shm_dtime; + outbuf.shm_ctime = shmseg->u.shm_ctime; + outbuf.shm_handle = shmseg->object; + error = copyout(&outbuf, uap->ubuf, sizeof(outbuf)); + if (error) + goto done2; + break; + default: + error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap); + break; + } +done2: + mtx_unlock(&Giant); + return (error); +#else + return (EINVAL); +#endif +} + +/* XXX casting to (sy_call_t *) is bogus, as usual. */ +static sy_call_t *shmcalls[] = { + (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, + (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, + (sy_call_t *)freebsd7_shmctl +}; + +int +sys_shmsys(td, uap) + struct thread *td; + /* XXX actually varargs. */ + struct shmsys_args /* { + int which; + int a2; + int a3; + int a4; + } */ *uap; +{ + int error; + + if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) + return (ENOSYS); + if (uap->which < 0 || + uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) + return (EINVAL); + mtx_lock(&Giant); + error = (*shmcalls[uap->which])(td, &uap->a2); + mtx_unlock(&Giant); + return (error); +} + +#endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ + +#ifdef COMPAT_FREEBSD32 + +int +freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) +{ + +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) + switch (uap->which) { + case 0: { /* shmat */ + struct shmat_args ap; + + ap.shmid = uap->a2; + ap.shmaddr = PTRIN(uap->a3); + ap.shmflg = uap->a4; + return (sysent[SYS_shmat].sy_call(td, &ap)); + } + case 2: { /* shmdt */ + struct shmdt_args ap; + + ap.shmaddr = PTRIN(uap->a2); + return (sysent[SYS_shmdt].sy_call(td, &ap)); + } + case 3: { /* shmget */ + struct shmget_args ap; + + ap.key = uap->a2; + ap.size = uap->a3; + ap.shmflg = uap->a4; + return (sysent[SYS_shmget].sy_call(td, &ap)); + } + case 4: { /* shmctl */ + struct freebsd7_freebsd32_shmctl_args ap; + + ap.shmid = uap->a2; + ap.cmd = uap->a3; + ap.buf = PTRIN(uap->a4); + return (freebsd7_freebsd32_shmctl(td, &ap)); + } + case 1: /* oshmctl */ + default: + return (EINVAL); + } +#else + return (nosys(td, NULL)); +#endif +} + +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) +int +freebsd7_freebsd32_shmctl(struct thread *td, + struct freebsd7_freebsd32_shmctl_args *uap) +{ + int error = 0; + union { + struct shmid_ds shmid_ds; + struct shm_info shm_info; + struct shminfo shminfo; + } u; + union { + struct shmid_ds32_old shmid_ds32; + struct shm_info32 shm_info32; + struct shminfo32 shminfo32; + } u32; + size_t sz; + + if (uap->cmd == IPC_SET) { + if ((error = copyin(uap->buf, &u32.shmid_ds32, + sizeof(u32.shmid_ds32)))) + goto done; + freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, + &u.shmid_ds.shm_perm); + CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); + CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); + CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); + CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); + CP(u32.shmid_ds32, u.shmid_ds, shm_atime); + CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); + CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); + } + + error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); + if (error) + goto done; + + /* Cases in which we need to copyout */ + switch (uap->cmd) { + case IPC_INFO: + CP(u.shminfo, u32.shminfo32, shmmax); + CP(u.shminfo, u32.shminfo32, shmmin); + CP(u.shminfo, u32.shminfo32, shmmni); + CP(u.shminfo, u32.shminfo32, shmseg); + CP(u.shminfo, u32.shminfo32, shmall); + error = copyout(&u32.shminfo32, uap->buf, + sizeof(u32.shminfo32)); + break; + case SHM_INFO: + CP(u.shm_info, u32.shm_info32, used_ids); + CP(u.shm_info, u32.shm_info32, shm_rss); + CP(u.shm_info, u32.shm_info32, shm_tot); + CP(u.shm_info, u32.shm_info32, shm_swp); + CP(u.shm_info, u32.shm_info32, swap_attempts); + CP(u.shm_info, u32.shm_info32, swap_successes); + error = copyout(&u32.shm_info32, uap->buf, + sizeof(u32.shm_info32)); + break; + case SHM_STAT: + case IPC_STAT: + freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, + &u32.shmid_ds32.shm_perm); + if (u.shmid_ds.shm_segsz > INT32_MAX) + u32.shmid_ds32.shm_segsz = INT32_MAX; + else + CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); + CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); + CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); + CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); + CP(u.shmid_ds, u32.shmid_ds32, shm_atime); + CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); + CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); + u32.shmid_ds32.shm_internal = 0; + error = copyout(&u32.shmid_ds32, uap->buf, + sizeof(u32.shmid_ds32)); + break; + } + +done: + if (error) { + /* Invalidate the return value */ + td->td_retval[0] = -1; + } + return (error); +} +#endif + +int +freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) +{ + int error = 0; + union { + struct shmid_ds shmid_ds; + struct shm_info shm_info; + struct shminfo shminfo; + } u; + union { + struct shmid_ds32 shmid_ds32; + struct shm_info32 shm_info32; + struct shminfo32 shminfo32; + } u32; + size_t sz; + + if (uap->cmd == IPC_SET) { + if ((error = copyin(uap->buf, &u32.shmid_ds32, + sizeof(u32.shmid_ds32)))) + goto done; + freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, + &u.shmid_ds.shm_perm); + CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); + CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); + CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); + CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); + CP(u32.shmid_ds32, u.shmid_ds, shm_atime); + CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); + CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); + } + + error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); + if (error) + goto done; + + /* Cases in which we need to copyout */ + switch (uap->cmd) { + case IPC_INFO: + CP(u.shminfo, u32.shminfo32, shmmax); + CP(u.shminfo, u32.shminfo32, shmmin); + CP(u.shminfo, u32.shminfo32, shmmni); + CP(u.shminfo, u32.shminfo32, shmseg); + CP(u.shminfo, u32.shminfo32, shmall); + error = copyout(&u32.shminfo32, uap->buf, + sizeof(u32.shminfo32)); + break; + case SHM_INFO: + CP(u.shm_info, u32.shm_info32, used_ids); + CP(u.shm_info, u32.shm_info32, shm_rss); + CP(u.shm_info, u32.shm_info32, shm_tot); + CP(u.shm_info, u32.shm_info32, shm_swp); + CP(u.shm_info, u32.shm_info32, swap_attempts); + CP(u.shm_info, u32.shm_info32, swap_successes); + error = copyout(&u32.shm_info32, uap->buf, + sizeof(u32.shm_info32)); + break; + case SHM_STAT: + case IPC_STAT: + freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, + &u32.shmid_ds32.shm_perm); + if (u.shmid_ds.shm_segsz > INT32_MAX) + u32.shmid_ds32.shm_segsz = INT32_MAX; + else + CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); + CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); + CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); + CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); + CP(u.shmid_ds, u32.shmid_ds32, shm_atime); + CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); + CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); + error = copyout(&u32.shmid_ds32, uap->buf, + sizeof(u32.shmid_ds32)); + break; + } + +done: + if (error) { + /* Invalidate the return value */ + td->td_retval[0] = -1; + } + return (error); +} +#endif + +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) + +#ifndef CP +#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) +#endif + +#ifndef _SYS_SYSPROTO_H_ +struct freebsd7_shmctl_args { + int shmid; + int cmd; + struct shmid_ds_old *buf; +}; +#endif +int +freebsd7_shmctl(td, uap) + struct thread *td; + struct freebsd7_shmctl_args *uap; +{ + int error = 0; + struct shmid_ds_old old; + struct shmid_ds buf; + size_t bufsz; + + /* + * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support + * Linux binaries. If we see the call come through the FreeBSD ABI, + * return an error back to the user since we do not to support this. + */ + if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || + uap->cmd == SHM_STAT) + return (EINVAL); + + /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ + if (uap->cmd == IPC_SET) { + if ((error = copyin(uap->buf, &old, sizeof(old)))) + goto done; + ipcperm_old2new(&old.shm_perm, &buf.shm_perm); + CP(old, buf, shm_segsz); + CP(old, buf, shm_lpid); + CP(old, buf, shm_cpid); + CP(old, buf, shm_nattch); + CP(old, buf, shm_atime); + CP(old, buf, shm_dtime); + CP(old, buf, shm_ctime); + } + + error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); + if (error) + goto done; + + /* Cases in which we need to copyout */ + switch (uap->cmd) { + case IPC_STAT: + ipcperm_new2old(&buf.shm_perm, &old.shm_perm); + if (buf.shm_segsz > INT_MAX) + old.shm_segsz = INT_MAX; + else + CP(buf, old, shm_segsz); + CP(buf, old, shm_lpid); + CP(buf, old, shm_cpid); + if (buf.shm_nattch > SHRT_MAX) + old.shm_nattch = SHRT_MAX; + else + CP(buf, old, shm_nattch); + CP(buf, old, shm_atime); + CP(buf, old, shm_dtime); + CP(buf, old, shm_ctime); + old.shm_internal = NULL; + error = copyout(&old, uap->buf, sizeof(old)); + break; + } + +done: + if (error) { + /* Invalidate the return value */ + td->td_retval[0] = -1; + } + return (error); +} + +#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || + COMPAT_FREEBSD7 */ + +static int +sysvshm_modload(struct module *module, int cmd, void *arg) +{ + int error = 0; + + switch (cmd) { + case MOD_LOAD: + error = shminit(); + if (error != 0) + shmunload(); + break; + case MOD_UNLOAD: + error = shmunload(); + break; + case MOD_SHUTDOWN: + break; + default: + error = EINVAL; + break; + } + return (error); +} + +static moduledata_t sysvshm_mod = { + "sysvshm", + &sysvshm_modload, + NULL +}; + +DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); +MODULE_VERSION(sysvshm, 1); |