source: branches/minix3-book/servers/pm/misc.c@ 4

Last change on this file since 4 was 4, checked in by Mattia Monga, 14 years ago

Importazione sorgenti libro
File size: 9.6 KB
Line 
1/* Miscellaneous system calls. Author: Kees J. Bot
2 * 31 Mar 2000
3 * The entry points into this file are:
4 * do_reboot: kill all processes, then reboot system
5 * do_svrctl: process manager control
6 * do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
7 * do_getprocnr: lookup process slot number (Jorrit N. Herder)
8 * do_memalloc: allocate a chunk of memory (Jorrit N. Herder)
9 * do_memfree: deallocate a chunk of memory (Jorrit N. Herder)
10 * do_getsetpriority: get/set process priority
11 */
12
13#include "pm.h"
14#include <minix/callnr.h>
15#include <signal.h>
16#include <sys/svrctl.h>
17#include <sys/resource.h>
18#include <minix/com.h>
19#include <string.h>
20#include "mproc.h"
21#include "param.h"
22
23/*===========================================================================*
24 * do_allocmem *
25 *===========================================================================*/
26PUBLIC int do_allocmem()
27{
28 vir_clicks mem_clicks;
29 phys_clicks mem_base;
30
31 mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
32 mem_base = alloc_mem(mem_clicks);
33 if (mem_base == NO_MEM) return(ENOMEM);
34 mp->mp_reply.membase = (phys_bytes) (mem_base << CLICK_SHIFT);
35 return(OK);
36}
37
38/*===========================================================================*
39 * do_freemem *
40 *===========================================================================*/
41PUBLIC int do_freemem()
42{
43 vir_clicks mem_clicks;
44 phys_clicks mem_base;
45
46 mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
47 mem_base = (m_in.membase + CLICK_SIZE -1 ) >> CLICK_SHIFT;
48 free_mem(mem_base, mem_clicks);
49 return(OK);
50}
51
52/*===========================================================================*
53 * do_getsysinfo *
54 *===========================================================================*/
55PUBLIC int do_getsysinfo()
56{
57 struct mproc *proc_addr;
58 vir_bytes src_addr, dst_addr;
59 struct kinfo kinfo;
60 size_t len;
61 int s;
62
63 switch(m_in.info_what) {
64 case SI_KINFO: /* kernel info is obtained via PM */
65 sys_getkinfo(&kinfo);
66 src_addr = (vir_bytes) &kinfo;
67 len = sizeof(struct kinfo);
68 break;
69 case SI_PROC_ADDR: /* get address of PM process table */
70 proc_addr = &mproc[0];
71 src_addr = (vir_bytes) &proc_addr;
72 len = sizeof(struct mproc *);
73 break;
74 case SI_PROC_TAB: /* copy entire process table */
75 src_addr = (vir_bytes) mproc;
76 len = sizeof(struct mproc) * NR_PROCS;
77 break;
78 default:
79 return(EINVAL);
80 }
81
82 dst_addr = (vir_bytes) m_in.info_where;
83 if (OK != (s=sys_datacopy(SELF, src_addr, who, dst_addr, len)))
84 return(s);
85 return(OK);
86}
87
88/*===========================================================================*
89 * do_getprocnr *
90 *===========================================================================*/
91PUBLIC int do_getprocnr()
92{
93 register struct mproc *rmp;
94 static char search_key[PROC_NAME_LEN+1];
95 int key_len;
96 int s;
97
98 if (m_in.pid >= 0) { /* lookup process by pid */
99 for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
100 if ((rmp->mp_flags & IN_USE) && (rmp->mp_pid==m_in.pid)) {
101 mp->mp_reply.procnr = (int) (rmp - mproc);
102 return(OK);
103 }
104 }
105 return(ESRCH);
106 } else if (m_in.namelen > 0) { /* lookup process by name */
107 key_len = MIN(m_in.namelen, PROC_NAME_LEN);
108 if (OK != (s=sys_datacopy(who, (vir_bytes) m_in.addr,
109 SELF, (vir_bytes) search_key, key_len)))
110 return(s);
111 search_key[key_len] = '\0'; /* terminate for safety */
112 for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
113 if ((rmp->mp_flags & IN_USE) &&
114 strncmp(rmp->mp_name, search_key, key_len)==0) {
115 mp->mp_reply.procnr = (int) (rmp - mproc);
116 return(OK);
117 }
118 }
119 return(ESRCH);
120 } else { /* return own process number */
121 mp->mp_reply.procnr = who;
122 }
123 return(OK);
124}
125
126/*===========================================================================*
127 * do_reboot *
128 *===========================================================================*/
129#define REBOOT_CODE "delay; boot"
130PUBLIC int do_reboot()
131{
132 char monitor_code[32*sizeof(char *)];
133 int code_len;
134 int abort_flag;
135
136 if (mp->mp_effuid != SUPER_USER) return(EPERM);
137
138 switch (m_in.reboot_flag) {
139 case RBT_HALT:
140 case RBT_PANIC:
141 case RBT_RESET:
142 abort_flag = m_in.reboot_flag;
143 break;
144 case RBT_REBOOT:
145 code_len = strlen(REBOOT_CODE) + 1;
146 strncpy(monitor_code, REBOOT_CODE, code_len);
147 abort_flag = RBT_MONITOR;
148 break;
149 case RBT_MONITOR:
150 code_len = m_in.reboot_strlen + 1;
151 if (code_len > sizeof(monitor_code)) return(EINVAL);
152 if (sys_datacopy(who, (vir_bytes) m_in.reboot_code,
153 PM_PROC_NR, (vir_bytes) monitor_code,
154 (phys_bytes) (code_len)) != OK) return(EFAULT);
155 if (monitor_code[code_len-1] != 0) return(EINVAL);
156 abort_flag = RBT_MONITOR;
157 break;
158 default:
159 return(EINVAL);
160 }
161
162 check_sig(-1, SIGKILL); /* kill all processes except init */
163 tell_fs(REBOOT,0,0,0); /* tell FS to prepare for shutdown */
164
165 /* Ask the kernel to abort. All system services, including the PM, will
166 * get a HARD_STOP notification. Await the notification in the main loop.
167 */
168 sys_abort(abort_flag, PM_PROC_NR, monitor_code, code_len);
169 return(SUSPEND); /* don't reply to killed process */
170}
171
172/*===========================================================================*
173 * do_getsetpriority *
174 *===========================================================================*/
175PUBLIC int do_getsetpriority()
176{
177 int arg_which, arg_who, arg_pri;
178 int rmp_nr;
179 struct mproc *rmp;
180
181 arg_which = m_in.m1_i1;
182 arg_who = m_in.m1_i2;
183 arg_pri = m_in.m1_i3; /* for SETPRIORITY */
184
185 /* Code common to GETPRIORITY and SETPRIORITY. */
186
187 /* Only support PRIO_PROCESS for now. */
188 if (arg_which != PRIO_PROCESS)
189 return(EINVAL);
190
191 if (arg_who == 0)
192 rmp_nr = who;
193 else
194 if ((rmp_nr = proc_from_pid(arg_who)) < 0)
195 return(ESRCH);
196
197 rmp = &mproc[rmp_nr];
198
199 if (mp->mp_effuid != SUPER_USER &&
200 mp->mp_effuid != rmp->mp_effuid && mp->mp_effuid != rmp->mp_realuid)
201 return EPERM;
202
203 /* If GET, that's it. */
204 if (call_nr == GETPRIORITY) {
205 return(rmp->mp_nice - PRIO_MIN);
206 }
207
208 /* Only root is allowed to reduce the nice level. */
209 if (rmp->mp_nice > arg_pri && mp->mp_effuid != SUPER_USER)
210 return(EACCES);
211
212 /* We're SET, and it's allowed. Do it and tell kernel. */
213 rmp->mp_nice = arg_pri;
214 return sys_nice(rmp_nr, arg_pri);
215}
216
217/*===========================================================================*
218 * do_svrctl *
219 *===========================================================================*/
220PUBLIC int do_svrctl()
221{
222 int s, req;
223 vir_bytes ptr;
224#define MAX_LOCAL_PARAMS 2
225 static struct {
226 char name[30];
227 char value[30];
228 } local_param_overrides[MAX_LOCAL_PARAMS];
229 static int local_params = 0;
230
231 req = m_in.svrctl_req;
232 ptr = (vir_bytes) m_in.svrctl_argp;
233
234 /* Is the request indeed for the MM? */
235 if (((req >> 8) & 0xFF) != 'M') return(EINVAL);
236
237 /* Control operations local to the PM. */
238 switch(req) {
239 case MMSETPARAM:
240 case MMGETPARAM: {
241 struct sysgetenv sysgetenv;
242 char search_key[64];
243 char *val_start;
244 size_t val_len;
245 size_t copy_len;
246
247 /* Copy sysgetenv structure to PM. */
248 if (sys_datacopy(who, ptr, SELF, (vir_bytes) &sysgetenv,
249 sizeof(sysgetenv)) != OK) return(EFAULT);
250
251 /* Set a param override? */
252 if (req == MMSETPARAM) {
253 if (local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
254 if (sysgetenv.keylen <= 0
255 || sysgetenv.keylen >=
256 sizeof(local_param_overrides[local_params].name)
257 || sysgetenv.vallen <= 0
258 || sysgetenv.vallen >=
259 sizeof(local_param_overrides[local_params].value))
260 return EINVAL;
261
262 if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.key,
263 SELF, (vir_bytes) local_param_overrides[local_params].name,
264 sysgetenv.keylen)) != OK)
265 return s;
266 if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.val,
267 SELF, (vir_bytes) local_param_overrides[local_params].value,
268 sysgetenv.keylen)) != OK)
269 return s;
270 local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
271 local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
272
273 local_params++;
274
275 return OK;
276 }
277
278 if (sysgetenv.keylen == 0) { /* copy all parameters */
279 val_start = monitor_params;
280 val_len = sizeof(monitor_params);
281 }
282 else { /* lookup value for key */
283 int p;
284 /* Try to get a copy of the requested key. */
285 if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
286 if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.key,
287 SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
288 return(s);
289
290 /* Make sure key is null-terminated and lookup value.
291 * First check local overrides.
292 */
293 search_key[sysgetenv.keylen-1]= '\0';
294 for(p = 0; p < local_params; p++) {
295 if (!strcmp(search_key, local_param_overrides[p].name)) {
296 val_start = local_param_overrides[p].value;
297 break;
298 }
299 }
300 if (p >= local_params && (val_start = find_param(search_key)) == NULL)
301 return(ESRCH);
302 val_len = strlen(val_start) + 1;
303 }
304
305 /* See if it fits in the client's buffer. */
306 if (val_len > sysgetenv.vallen)
307 return E2BIG;
308
309 /* Value found, make the actual copy (as far as possible). */
310 copy_len = MIN(val_len, sysgetenv.vallen);
311 if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
312 who, (vir_bytes) sysgetenv.val, copy_len)) != OK)
313 return(s);
314
315 return OK;
316 }
317 default:
318 return(EINVAL);
319 }
320}
Note: See TracBrowser for help on using the repository browser.