xref: /openbmc/linux/fs/proc/array.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 /*
2  *  linux/fs/proc/array.c
3  *
4  *  Copyright (C) 1992  by Linus Torvalds
5  *  based on ideas by Darren Senn
6  *
7  * Fixes:
8  * Michael. K. Johnson: stat,statm extensions.
9  *                      <johnsonm@stolaf.edu>
10  *
11  * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
12  *                      make sure SET_PROCTITLE works. Also removed
13  *                      bad '!' which forced address recalculation for
14  *                      EVERY character on the current page.
15  *                      <middelin@polyware.iaf.nl>
16  *
17  * Danny ter Haar    :	added cpuinfo
18  *			<dth@cistron.nl>
19  *
20  * Alessandro Rubini :  profile extension.
21  *                      <rubini@ipvvis.unipv.it>
22  *
23  * Jeff Tranter      :  added BogoMips field to cpuinfo
24  *                      <Jeff_Tranter@Mitel.COM>
25  *
26  * Bruno Haible      :  remove 4K limit for the maps file
27  *			<haible@ma2s2.mathematik.uni-karlsruhe.de>
28  *
29  * Yves Arrouye      :  remove removal of trailing spaces in get_array.
30  *			<Yves.Arrouye@marin.fdn.fr>
31  *
32  * Jerome Forissier  :  added per-CPU time information to /proc/stat
33  *                      and /proc/<pid>/cpu extension
34  *                      <forissier@isia.cma.fr>
35  *			- Incorporation and non-SMP safe operation
36  *			of forissier patch in 2.1.78 by
37  *			Hans Marcus <crowbar@concepts.nl>
38  *
39  * aeb@cwi.nl        :  /proc/partitions
40  *
41  *
42  * Alan Cox	     :  security fixes.
43  *			<Alan.Cox@linux.org>
44  *
45  * Al Viro           :  safe handling of mm_struct
46  *
47  * Gerhard Wichert   :  added BIGMEM support
48  * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
49  *
50  * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
51  *			 :  proc_misc.c. The rest may eventually go into
52  *			 :  base.c too.
53  */
54 
55 #include <linux/types.h>
56 #include <linux/errno.h>
57 #include <linux/time.h>
58 #include <linux/kernel.h>
59 #include <linux/kernel_stat.h>
60 #include <linux/tty.h>
61 #include <linux/string.h>
62 #include <linux/mman.h>
63 #include <linux/proc_fs.h>
64 #include <linux/ioport.h>
65 #include <linux/mm.h>
66 #include <linux/hugetlb.h>
67 #include <linux/pagemap.h>
68 #include <linux/swap.h>
69 #include <linux/slab.h>
70 #include <linux/smp.h>
71 #include <linux/signal.h>
72 #include <linux/highmem.h>
73 #include <linux/file.h>
74 #include <linux/times.h>
75 #include <linux/cpuset.h>
76 #include <linux/rcupdate.h>
77 #include <linux/delayacct.h>
78 
79 #include <asm/uaccess.h>
80 #include <asm/pgtable.h>
81 #include <asm/io.h>
82 #include <asm/processor.h>
83 #include "internal.h"
84 
85 /* Gcc optimizes away "strlen(x)" for constant x */
86 #define ADDBUF(buffer, string) \
87 do { memcpy(buffer, string, strlen(string)); \
88      buffer += strlen(string); } while (0)
89 
90 static inline char * task_name(struct task_struct *p, char * buf)
91 {
92 	int i;
93 	char * name;
94 	char tcomm[sizeof(p->comm)];
95 
96 	get_task_comm(tcomm, p);
97 
98 	ADDBUF(buf, "Name:\t");
99 	name = tcomm;
100 	i = sizeof(tcomm);
101 	do {
102 		unsigned char c = *name;
103 		name++;
104 		i--;
105 		*buf = c;
106 		if (!c)
107 			break;
108 		if (c == '\\') {
109 			buf[1] = c;
110 			buf += 2;
111 			continue;
112 		}
113 		if (c == '\n') {
114 			buf[0] = '\\';
115 			buf[1] = 'n';
116 			buf += 2;
117 			continue;
118 		}
119 		buf++;
120 	} while (i);
121 	*buf = '\n';
122 	return buf+1;
123 }
124 
125 /*
126  * The task state array is a strange "bitmap" of
127  * reasons to sleep. Thus "running" is zero, and
128  * you can test for combinations of others with
129  * simple bit tests.
130  */
131 static const char *task_state_array[] = {
132 	"R (running)",		/*  0 */
133 	"S (sleeping)",		/*  1 */
134 	"D (disk sleep)",	/*  2 */
135 	"T (stopped)",		/*  4 */
136 	"T (tracing stop)",	/*  8 */
137 	"Z (zombie)",		/* 16 */
138 	"X (dead)"		/* 32 */
139 };
140 
141 static inline const char * get_task_state(struct task_struct *tsk)
142 {
143 	unsigned int state = (tsk->state & (TASK_RUNNING |
144 					    TASK_INTERRUPTIBLE |
145 					    TASK_UNINTERRUPTIBLE |
146 					    TASK_STOPPED |
147 					    TASK_TRACED)) |
148 			(tsk->exit_state & (EXIT_ZOMBIE |
149 					    EXIT_DEAD));
150 	const char **p = &task_state_array[0];
151 
152 	while (state) {
153 		p++;
154 		state >>= 1;
155 	}
156 	return *p;
157 }
158 
159 static inline char * task_state(struct task_struct *p, char *buffer)
160 {
161 	struct group_info *group_info;
162 	int g;
163 	struct fdtable *fdt = NULL;
164 
165 	rcu_read_lock();
166 	buffer += sprintf(buffer,
167 		"State:\t%s\n"
168 		"SleepAVG:\t%lu%%\n"
169 		"Tgid:\t%d\n"
170 		"Pid:\t%d\n"
171 		"PPid:\t%d\n"
172 		"TracerPid:\t%d\n"
173 		"Uid:\t%d\t%d\t%d\t%d\n"
174 		"Gid:\t%d\t%d\t%d\t%d\n",
175 		get_task_state(p),
176 		(p->sleep_avg/1024)*100/(1020000000/1024),
177 	       	p->tgid, p->pid,
178 	       	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
179 		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
180 		p->uid, p->euid, p->suid, p->fsuid,
181 		p->gid, p->egid, p->sgid, p->fsgid);
182 
183 	task_lock(p);
184 	if (p->files)
185 		fdt = files_fdtable(p->files);
186 	buffer += sprintf(buffer,
187 		"FDSize:\t%d\n"
188 		"Groups:\t",
189 		fdt ? fdt->max_fds : 0);
190 	rcu_read_unlock();
191 
192 	group_info = p->group_info;
193 	get_group_info(group_info);
194 	task_unlock(p);
195 
196 	for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
197 		buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
198 	put_group_info(group_info);
199 
200 	buffer += sprintf(buffer, "\n");
201 	return buffer;
202 }
203 
204 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
205 {
206 	int i, len;
207 
208 	len = strlen(header);
209 	memcpy(buffer, header, len);
210 	buffer += len;
211 
212 	i = _NSIG;
213 	do {
214 		int x = 0;
215 
216 		i -= 4;
217 		if (sigismember(set, i+1)) x |= 1;
218 		if (sigismember(set, i+2)) x |= 2;
219 		if (sigismember(set, i+3)) x |= 4;
220 		if (sigismember(set, i+4)) x |= 8;
221 		*buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
222 	} while (i >= 4);
223 
224 	*buffer++ = '\n';
225 	*buffer = 0;
226 	return buffer;
227 }
228 
229 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
230 				    sigset_t *catch)
231 {
232 	struct k_sigaction *k;
233 	int i;
234 
235 	k = p->sighand->action;
236 	for (i = 1; i <= _NSIG; ++i, ++k) {
237 		if (k->sa.sa_handler == SIG_IGN)
238 			sigaddset(ign, i);
239 		else if (k->sa.sa_handler != SIG_DFL)
240 			sigaddset(catch, i);
241 	}
242 }
243 
244 static inline char * task_sig(struct task_struct *p, char *buffer)
245 {
246 	unsigned long flags;
247 	sigset_t pending, shpending, blocked, ignored, caught;
248 	int num_threads = 0;
249 	unsigned long qsize = 0;
250 	unsigned long qlim = 0;
251 
252 	sigemptyset(&pending);
253 	sigemptyset(&shpending);
254 	sigemptyset(&blocked);
255 	sigemptyset(&ignored);
256 	sigemptyset(&caught);
257 
258 	rcu_read_lock();
259 	if (lock_task_sighand(p, &flags)) {
260 		pending = p->pending.signal;
261 		shpending = p->signal->shared_pending.signal;
262 		blocked = p->blocked;
263 		collect_sigign_sigcatch(p, &ignored, &caught);
264 		num_threads = atomic_read(&p->signal->count);
265 		qsize = atomic_read(&p->user->sigpending);
266 		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
267 		unlock_task_sighand(p, &flags);
268 	}
269 	rcu_read_unlock();
270 
271 	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
272 	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
273 
274 	/* render them all */
275 	buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
276 	buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
277 	buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
278 	buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
279 	buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
280 
281 	return buffer;
282 }
283 
284 static inline char *task_cap(struct task_struct *p, char *buffer)
285 {
286     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
287 			    "CapPrm:\t%016x\n"
288 			    "CapEff:\t%016x\n",
289 			    cap_t(p->cap_inheritable),
290 			    cap_t(p->cap_permitted),
291 			    cap_t(p->cap_effective));
292 }
293 
294 int proc_pid_status(struct task_struct *task, char * buffer)
295 {
296 	char * orig = buffer;
297 	struct mm_struct *mm = get_task_mm(task);
298 
299 	buffer = task_name(task, buffer);
300 	buffer = task_state(task, buffer);
301 
302 	if (mm) {
303 		buffer = task_mem(mm, buffer);
304 		mmput(mm);
305 	}
306 	buffer = task_sig(task, buffer);
307 	buffer = task_cap(task, buffer);
308 	buffer = cpuset_task_status_allowed(task, buffer);
309 #if defined(CONFIG_S390)
310 	buffer = task_show_regs(task, buffer);
311 #endif
312 	return buffer - orig;
313 }
314 
315 static int do_task_stat(struct task_struct *task, char * buffer, int whole)
316 {
317 	unsigned long vsize, eip, esp, wchan = ~0UL;
318 	long priority, nice;
319 	int tty_pgrp = -1, tty_nr = 0;
320 	sigset_t sigign, sigcatch;
321 	char state;
322 	int res;
323  	pid_t ppid = 0, pgid = -1, sid = -1;
324 	int num_threads = 0;
325 	struct mm_struct *mm;
326 	unsigned long long start_time;
327 	unsigned long cmin_flt = 0, cmaj_flt = 0;
328 	unsigned long  min_flt = 0,  maj_flt = 0;
329 	cputime_t cutime, cstime, utime, stime;
330 	unsigned long rsslim = 0;
331 	char tcomm[sizeof(task->comm)];
332 	unsigned long flags;
333 
334 	state = *get_task_state(task);
335 	vsize = eip = esp = 0;
336 	mm = get_task_mm(task);
337 	if (mm) {
338 		vsize = task_vsize(mm);
339 		eip = KSTK_EIP(task);
340 		esp = KSTK_ESP(task);
341 	}
342 
343 	get_task_comm(tcomm, task);
344 
345 	sigemptyset(&sigign);
346 	sigemptyset(&sigcatch);
347 	cutime = cstime = utime = stime = cputime_zero;
348 
349 	rcu_read_lock();
350 	if (lock_task_sighand(task, &flags)) {
351 		struct signal_struct *sig = task->signal;
352 
353 		if (sig->tty) {
354 			tty_pgrp = pid_nr(sig->tty->pgrp);
355 			tty_nr = new_encode_dev(tty_devnum(sig->tty));
356 		}
357 
358 		num_threads = atomic_read(&sig->count);
359 		collect_sigign_sigcatch(task, &sigign, &sigcatch);
360 
361 		cmin_flt = sig->cmin_flt;
362 		cmaj_flt = sig->cmaj_flt;
363 		cutime = sig->cutime;
364 		cstime = sig->cstime;
365 		rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
366 
367 		/* add up live thread stats at the group level */
368 		if (whole) {
369 			struct task_struct *t = task;
370 			do {
371 				min_flt += t->min_flt;
372 				maj_flt += t->maj_flt;
373 				utime = cputime_add(utime, t->utime);
374 				stime = cputime_add(stime, t->stime);
375 				t = next_thread(t);
376 			} while (t != task);
377 
378 			min_flt += sig->min_flt;
379 			maj_flt += sig->maj_flt;
380 			utime = cputime_add(utime, sig->utime);
381 			stime = cputime_add(stime, sig->stime);
382 		}
383 
384 		sid = signal_session(sig);
385 		pgid = process_group(task);
386 		ppid = rcu_dereference(task->real_parent)->tgid;
387 
388 		unlock_task_sighand(task, &flags);
389 	}
390 	rcu_read_unlock();
391 
392 	if (!whole || num_threads<2)
393 		wchan = get_wchan(task);
394 	if (!whole) {
395 		min_flt = task->min_flt;
396 		maj_flt = task->maj_flt;
397 		utime = task->utime;
398 		stime = task->stime;
399 	}
400 
401 	/* scale priority and nice values from timeslices to -20..20 */
402 	/* to make it look like a "normal" Unix priority/nice value  */
403 	priority = task_prio(task);
404 	nice = task_nice(task);
405 
406 	/* Temporary variable needed for gcc-2.96 */
407 	/* convert timespec -> nsec*/
408 	start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC
409 				+ task->start_time.tv_nsec;
410 	/* convert nsec -> ticks */
411 	start_time = nsec_to_clock_t(start_time);
412 
413 	res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %lu \
414 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
415 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
416 		task->pid,
417 		tcomm,
418 		state,
419 		ppid,
420 		pgid,
421 		sid,
422 		tty_nr,
423 		tty_pgrp,
424 		task->flags,
425 		min_flt,
426 		cmin_flt,
427 		maj_flt,
428 		cmaj_flt,
429 		cputime_to_clock_t(utime),
430 		cputime_to_clock_t(stime),
431 		cputime_to_clock_t(cutime),
432 		cputime_to_clock_t(cstime),
433 		priority,
434 		nice,
435 		num_threads,
436 		start_time,
437 		vsize,
438 		mm ? get_mm_rss(mm) : 0,
439 	        rsslim,
440 		mm ? mm->start_code : 0,
441 		mm ? mm->end_code : 0,
442 		mm ? mm->start_stack : 0,
443 		esp,
444 		eip,
445 		/* The signal information here is obsolete.
446 		 * It must be decimal for Linux 2.0 compatibility.
447 		 * Use /proc/#/status for real-time signals.
448 		 */
449 		task->pending.signal.sig[0] & 0x7fffffffUL,
450 		task->blocked.sig[0] & 0x7fffffffUL,
451 		sigign      .sig[0] & 0x7fffffffUL,
452 		sigcatch    .sig[0] & 0x7fffffffUL,
453 		wchan,
454 		0UL,
455 		0UL,
456 		task->exit_signal,
457 		task_cpu(task),
458 		task->rt_priority,
459 		task->policy,
460 		(unsigned long long)delayacct_blkio_ticks(task));
461 	if(mm)
462 		mmput(mm);
463 	return res;
464 }
465 
466 int proc_tid_stat(struct task_struct *task, char * buffer)
467 {
468 	return do_task_stat(task, buffer, 0);
469 }
470 
471 int proc_tgid_stat(struct task_struct *task, char * buffer)
472 {
473 	return do_task_stat(task, buffer, 1);
474 }
475 
476 int proc_pid_statm(struct task_struct *task, char *buffer)
477 {
478 	int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
479 	struct mm_struct *mm = get_task_mm(task);
480 
481 	if (mm) {
482 		size = task_statm(mm, &shared, &text, &data, &resident);
483 		mmput(mm);
484 	}
485 
486 	return sprintf(buffer,"%d %d %d %d %d %d %d\n",
487 		       size, resident, shared, text, lib, data, 0);
488 }
489