2 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $DragonFly: src/sys/kern/imgact_resident.c,v 1.4 2004/06/03 18:17:43 hmp Exp $
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/sysproto.h>
34 #include <sys/imgact.h>
35 #include <sys/imgact_aout.h>
38 #include <sys/resourcevar.h>
39 #include <sys/sysent.h>
40 #include <sys/systm.h>
42 #include <sys/vnode.h>
43 #include <sys/inflate.h>
44 #include <sys/sysctl.h>
46 #include <sys/resident.h>
49 #include <vm/vm_param.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_kern.h>
53 #include <vm/vm_extern.h>
55 static int exec_res_id = 0;
57 static TAILQ_HEAD(,vmresident) exec_res_list;
59 static MALLOC_DEFINE(M_EXEC_RES, "vmresident", "resident execs");
61 /* lockmgr lock for protecting the exec_res_list */
62 static struct lock exec_list_lock;
65 vm_resident_init(void *__dummy)
67 lockinit(&exec_list_lock, 0, "vmres", 0, 0);
68 TAILQ_INIT(&exec_res_list);
70 SYSINIT(vmres, SI_SUB_VM, SI_ORDER_ANY, vm_resident_init, 0);
73 fill_xresident(struct vmresident *vr, struct xresident *in, struct thread *td)
81 in->res_entry_addr = vr->vr_entry_addr;
82 in->res_id = vr->vr_id;
84 char *freepath, *fullpath;
85 error = vn_fullpath(td->td_proc, vrtmp, &fullpath, &freepath);
87 /* could not retrieve cached path, return zero'ed string */
88 bzero(in->res_file, MAXPATHLEN);
91 bcopy(fullpath, in->res_file, MAXPATHLEN);
92 free(freepath, M_TEMP);
95 /* indicate that we are using the vnode */
96 error = vget(vrtmp, NULL, LK_EXCLUSIVE, td);
100 /* retrieve underlying stat information and release vnode */
101 error = vn_stat(vrtmp, &st, td);
111 printf("fill_xresident, error = %d\n", error);
116 sysctl_vm_resident(SYSCTL_HANDLER_ARGS)
118 struct vmresident *vmres;
123 /* only super-user should call this sysctl */
125 if ((suser(td)) != 0)
130 if (exec_res_id == 0)
133 /* client queried for number of resident binaries */
135 return SYSCTL_OUT(req, 0, exec_res_id);
137 lockmgr(&exec_list_lock, LK_SHARED, NULL, td);
138 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
139 struct xresident xres;
140 error = fill_xresident(vmres, &xres, td);
144 error = SYSCTL_OUT(req, (void *)&xres,
145 sizeof(struct xresident));
149 lockmgr(&exec_list_lock, LK_RELEASE, NULL, td);
153 SYSCTL_PROC(_vm, OID_AUTO, resident, CTLTYPE_OPAQUE|CTLFLAG_RD, 0, 0,
154 sysctl_vm_resident, "S,xresident", "resident executables (sys/resident.h)");
157 exec_resident_imgact(struct image_params *imgp)
159 struct vmresident *vmres;
162 * resident image activator
164 if ((vmres = imgp->vp->v_resident) == NULL)
166 exec_new_vmspace(imgp, vmres->vr_vmspace);
168 imgp->interpreted = 0;
169 imgp->proc->p_sysent = vmres->vr_sysent;
170 imgp->entry_addr = vmres->vr_entry_addr;
175 * exec_sys_register(entry)
177 * Register ourselves for resident execution. Only root can do this. This
178 * will snapshot the vmspace and cause future exec's of the specified binary
179 * to use the snapshot directly rather then load & relocate a new copy.
182 exec_sys_register(struct exec_sys_register_args *uap)
184 struct vmresident *vmres;
190 if ((error = suser(p->p_thread)) != 0)
192 if ((vp = p->p_textvp) == NULL)
197 vmres = malloc(sizeof(*vmres), M_EXEC_RES, M_WAITOK);
198 vp->v_resident = vmres;
199 vmres->vr_vnode = vp;
200 vmres->vr_sysent = p->p_sysent;
201 vmres->vr_id = ++exec_res_id;
202 vmres->vr_entry_addr = (intptr_t)uap->entry;
203 vmres->vr_vmspace = vmspace_fork(p->p_vmspace); /* XXX order */
205 lockmgr(&exec_list_lock, LK_EXCLUSIVE, NULL, curthread);
206 TAILQ_INSERT_TAIL(&exec_res_list, vmres, vr_link);
207 lockmgr(&exec_list_lock, LK_RELEASE, NULL, curthread);
213 * exec_sys_unregister(id)
215 * Unregister the specified id. If an id of -1 is used unregister
216 * the registration associated with the current process. An id of -2
217 * unregisters everything.
220 exec_sys_unregister(struct exec_sys_unregister_args *uap)
222 struct vmresident *vmres;
229 if ((error = suser(p->p_thread)) != 0)
233 * If id is -1, unregister ourselves
235 if ((id = uap->id) == -1 && p->p_textvp && p->p_textvp->v_resident)
236 id = p->p_textvp->v_resident->vr_id;
239 * Look for the registration
244 lockmgr(&exec_list_lock, LK_EXCLUSIVE, NULL, curthread);
246 TAILQ_FOREACH(vmres, &exec_res_list, vr_link) {
247 if (id == -2 || vmres->vr_id == id) {
248 TAILQ_REMOVE(&exec_res_list, vmres, vr_link);
249 if (vmres->vr_vnode) {
250 vmres->vr_vnode->v_resident = NULL;
251 vdrop(vmres->vr_vnode);
252 vmres->vr_vnode = NULL;
254 if (vmres->vr_vmspace) {
255 vmspace_free(vmres->vr_vmspace);
256 vmres->vr_vmspace = NULL;
258 free(vmres, M_EXEC_RES);
265 lockmgr(&exec_list_lock, LK_RELEASE, NULL, curthread);
267 uap->sysmsg_result = count;