1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
|
/** \file builtin_ulimit.c Functions defining the ulimit builtin
Functions used for implementing the ulimit builtin.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <errno.h>
#include "fallback.h"
#include "util.h"
#include "builtin.h"
#include "common.h"
#include "wgetopt.h"
/**
Struct describing a resource limit
*/
struct resource_t
{
/**
Resource id
*/
int resource;
/**
Description of resource
*/
const wchar_t *desc;
/**
Switch used on commandline to specify resource
*/
wchar_t switch_char;
/**
The implicit multiplier used when setting getting values
*/
int multiplier;
}
;
/**
Array of resource_t structs, describing all known resource types.
*/
static const struct resource_t resource_arr[] =
{
{
RLIMIT_CORE, L"Maximum size of core files created", L'c', 1024
}
,
{
RLIMIT_DATA, L"Maximum size of a process’s data segment", L'd', 1024
}
,
{
RLIMIT_FSIZE, L"Maximum size of files created by the shell", L'f', 1024
}
,
#ifdef RLIMIT_MEMLOCK
{
RLIMIT_MEMLOCK, L"Maximum size that may be locked into memory", L'l', 1024
}
,
#endif
#ifdef RLIMIT_RSS
{
RLIMIT_RSS, L"Maximum resident set size", L'm', 1024
}
,
#endif
{
RLIMIT_NOFILE, L"Maximum number of open file descriptors", L'n', 1
}
,
{
RLIMIT_STACK, L"Maximum stack size", L's', 1024
}
,
{
RLIMIT_CPU, L"Maximum amount of cpu time in seconds", L't', 1
}
,
#ifdef RLIMIT_NPROC
{
RLIMIT_NPROC, L"Maximum number of processes available to a single user", L'u', 1
}
,
#endif
#ifdef RLIMIT_AS
{
RLIMIT_AS, L"Maximum amount of virtual memory available to the shell", L'v', 1024
}
,
#endif
{
0, 0, 0, 0
}
}
;
/**
Get the implicit multiplication factor for the specified resource limit
*/
static int get_multiplier(int what)
{
int i;
for (i=0; resource_arr[i].desc; i++)
{
if (resource_arr[i].resource == what)
{
return resource_arr[i].multiplier;
}
}
return -1;
}
/**
Return the value for the specified resource limit. This function
does _not_ multiply the limit value by the multiplier constant used
by the commandline ulimit.
*/
static rlim_t get(int resource, int hard)
{
struct rlimit ls;
getrlimit(resource, &ls);
return hard ? ls.rlim_max:ls.rlim_cur;
}
/**
Print the value of the specified resource limit
*/
static void print(int resource, int hard)
{
rlim_t l = get(resource, hard);
if (l == RLIM_INFINITY)
stdout_buffer.append(L"unlimited\n");
else
append_format(stdout_buffer, L"%d\n", l / get_multiplier(resource));
}
/**
Print values of all resource limits
*/
static void print_all(int hard)
{
int i;
int w=0;
for (i=0; resource_arr[i].desc; i++)
{
w=maxi(w, my_wcswidth(resource_arr[i].desc));
}
for (i=0; resource_arr[i].desc; i++)
{
struct rlimit ls;
rlim_t l;
getrlimit(resource_arr[i].resource, &ls);
l = hard ? ls.rlim_max:ls.rlim_cur;
const wchar_t *unit = ((resource_arr[i].resource==RLIMIT_CPU)?L"(seconds, ":(get_multiplier(resource_arr[i].resource)==1?L"(":L"(kB, "));
append_format(stdout_buffer,
L"%-*ls %10ls-%lc) ",
w,
resource_arr[i].desc,
unit,
resource_arr[i].switch_char);
if (l == RLIM_INFINITY)
{
stdout_buffer.append(L"unlimited\n");
}
else
{
append_format(stdout_buffer, L"%d\n", l/get_multiplier(resource_arr[i].resource));
}
}
}
/**
Returns the description for the specified resource limit
*/
static const wchar_t *get_desc(int what)
{
int i;
for (i=0; resource_arr[i].desc; i++)
{
if (resource_arr[i].resource == what)
{
return resource_arr[i].desc;
}
}
return L"Not a resource";
}
/**
Set the new value of the specified resource limit. This function
does _not_ multiply the limit value by the multiplier constant used
by the commandline ulimit.
*/
static int set(int resource, int hard, int soft, rlim_t value)
{
struct rlimit ls;
getrlimit(resource, &ls);
if (hard)
{
ls.rlim_max = value;
}
if (soft)
{
ls.rlim_cur = value;
/*
Do not attempt to set the soft limit higher than the hard limit
*/
if ((value == RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY) ||
(value != RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY && value > ls.rlim_max))
{
ls.rlim_cur = ls.rlim_max;
}
}
if (setrlimit(resource, &ls))
{
if (errno == EPERM)
append_format(stderr_buffer, L"ulimit: Permission denied when changing resource of type '%ls'\n", get_desc(resource));
else
builtin_wperror(L"ulimit");
return 1;
}
return 0;
}
/**
The ulimit builtin, used for setting resource limits. Defined in
builtin_ulimit.c.
*/
static int builtin_ulimit(parser_t &parser, wchar_t ** argv)
{
int hard=0;
int soft=0;
int what = RLIMIT_FSIZE;
int report_all = 0;
int argc = builtin_count_args(argv);
woptind=0;
while (1)
{
static const struct woption
long_options[] =
{
{
L"all", no_argument, 0, 'a'
}
,
{
L"hard", no_argument, 0, 'H'
}
,
{
L"soft", no_argument, 0, 'S'
}
,
{
L"core-size", no_argument, 0, 'c'
}
,
{
L"data-size", no_argument, 0, 'd'
}
,
{
L"file-size", no_argument, 0, 'f'
}
,
{
L"lock-size", no_argument, 0, 'l'
}
,
{
L"resident-set-size", no_argument, 0, 'm'
}
,
{
L"file-descriptor-count", no_argument, 0, 'n'
}
,
{
L"stack-size", no_argument, 0, 's'
}
,
{
L"cpu-time", no_argument, 0, 't'
}
,
{
L"process-count", no_argument, 0, 'u'
}
,
{
L"virtual-memory-size", no_argument, 0, 'v'
}
,
{
L"help", no_argument, 0, 'h'
}
,
{
0, 0, 0, 0
}
}
;
int opt_index = 0;
int opt = wgetopt_long(argc,
argv,
L"aHScdflmnstuvh",
long_options,
&opt_index);
if (opt == -1)
break;
switch (opt)
{
case 0:
if (long_options[opt_index].flag != 0)
break;
append_format(stderr_buffer,
BUILTIN_ERR_UNKNOWN,
argv[0],
long_options[opt_index].name);
builtin_print_help(parser, argv[0], stderr_buffer);
return 1;
case L'a':
report_all=1;
break;
case L'H':
hard=1;
break;
case L'S':
soft=1;
break;
case L'c':
what=RLIMIT_CORE;
break;
case L'd':
what=RLIMIT_DATA;
break;
case L'f':
what=RLIMIT_FSIZE;
break;
#ifdef RLIMIT_MEMLOCK
case L'l':
what=RLIMIT_MEMLOCK;
break;
#endif
#ifdef RLIMIT_RSS
case L'm':
what=RLIMIT_RSS;
break;
#endif
case L'n':
what=RLIMIT_NOFILE;
break;
case L's':
what=RLIMIT_STACK;
break;
case L't':
what=RLIMIT_CPU;
break;
#ifdef RLIMIT_NPROC
case L'u':
what=RLIMIT_NPROC;
break;
#endif
#ifdef RLIMIT_AS
case L'v':
what=RLIMIT_AS;
break;
#endif
case L'h':
builtin_print_help(parser, argv[0], stdout_buffer);
return 0;
case L'?':
builtin_unknown_option(parser, argv[0], argv[woptind-1]);
return 1;
}
}
if (report_all)
{
if (argc - woptind == 0)
{
print_all(hard);
}
else
{
stderr_buffer.append(argv[0]);
stderr_buffer.append(L": Too many arguments\n");
builtin_print_help(parser, argv[0], stderr_buffer);
return 1;
}
return 0;
}
switch (argc - woptind)
{
case 0:
{
/*
Show current limit value
*/
print(what, hard);
break;
}
case 1:
{
/*
Change current limit value
*/
rlim_t new_limit;
wchar_t *end;
/*
Set both hard and soft limits if nothing else was specified
*/
if (!(hard+soft))
{
hard=soft=1;
}
if (wcscasecmp(argv[woptind], L"unlimited")==0)
{
new_limit = RLIM_INFINITY;
}
else if (wcscasecmp(argv[woptind], L"hard")==0)
{
new_limit = get(what, 1);
}
else if (wcscasecmp(argv[woptind], L"soft")==0)
{
new_limit = get(what, soft);
}
else
{
errno=0;
new_limit = wcstol(argv[woptind], &end, 10);
if (errno || *end)
{
append_format(stderr_buffer,
L"%ls: Invalid limit '%ls'\n",
argv[0],
argv[woptind]);
builtin_print_help(parser, argv[0], stderr_buffer);
return 1;
}
new_limit *= get_multiplier(what);
}
return set(what, hard, soft, new_limit);
}
default:
{
stderr_buffer.append(argv[0]);
stderr_buffer.append(L": Too many arguments\n");
builtin_print_help(parser, argv[0], stderr_buffer);
return 1;
}
}
return 0;
}
|