summaryrefslogtreecommitdiff
path: root/procps/ps.c
blob: be11a1b6771ded2e54b2ada1983a563851e4d1db (plain)
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
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
/* vi: set sw=4 ts=4: */
/*
 * Mini ps implementation(s) for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
 *                         (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
 */

#include "libbb.h"

/* Absolute maximum on output line length */
enum { MAX_WIDTH = 2*1024 };

#if ENABLE_DESKTOP

#include <sys/times.h> /* for times() */
#ifndef AT_CLKTCK
#define AT_CLKTCK 17
#endif


#if ENABLE_SELINUX
#define SELINUX_O_PREFIX "label,"
#define DEFAULT_O_STR    (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#else
#define DEFAULT_O_STR    ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
#endif

typedef struct {
	uint16_t width;
	char name6[6];
	const char *header;
	void (*f)(char *buf, int size, const procps_status_t *ps);
	int ps_flags;
} ps_out_t;

struct globals {
	ps_out_t* out;
	int out_cnt;
	int print_header;
	int need_flags;
	char *buffer;
	unsigned terminal_width;
#if ENABLE_FEATURE_PS_TIME
	unsigned kernel_HZ;
	unsigned long long seconds_since_boot;
#endif
	char default_o[sizeof(DEFAULT_O_STR)];
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define out                (G.out               )
#define out_cnt            (G.out_cnt           )
#define print_header       (G.print_header      )
#define need_flags         (G.need_flags        )
#define buffer             (G.buffer            )
#define terminal_width     (G.terminal_width    )
#define kernel_HZ          (G.kernel_HZ         )
#define seconds_since_boot (G.seconds_since_boot)
#define default_o          (G.default_o         )
#define INIT_G() do { } while (0)

#if ENABLE_FEATURE_PS_TIME
/* for ELF executables, notes are pushed before environment and args */
static ptrdiff_t find_elf_note(ptrdiff_t findme)
{
	ptrdiff_t *ep = (ptrdiff_t *) environ;

	while (*ep++);
	while (*ep) {
		if (ep[0] == findme) {
			return ep[1];
		}
		ep += 2;
	}
	return -1;
}

#if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
static unsigned get_HZ_by_waiting(void)
{
	struct timeval tv1, tv2;
	unsigned t1, t2, r, hz;
	unsigned cnt = cnt; /* for compiler */
	int diff;

	r = 0;

	/* Wait for times() to reach new tick */
	t1 = times(NULL);
	do {
		t2 = times(NULL);
	} while (t2 == t1);
	gettimeofday(&tv2, NULL);

	do {
		t1 = t2;
		tv1.tv_usec = tv2.tv_usec;

		/* Wait exactly one times() tick */
		do {
			t2 = times(NULL);
		} while (t2 == t1);
		gettimeofday(&tv2, NULL);

		/* Calculate ticks per sec, rounding up to even */
		diff = tv2.tv_usec - tv1.tv_usec;
		if (diff <= 0) diff += 1000000;
		hz = 1000000u / (unsigned)diff;
		hz = (hz+1) & ~1;

		/* Count how many same hz values we saw */
		if (r != hz) {
			r = hz;
			cnt = 0;
		}
		cnt++;
	} while (cnt < 3); /* exit if saw 3 same values */

	return r;
}
#else
static inline unsigned get_HZ_by_waiting(void)
{
	/* Better method? */
	return 100;
}
#endif

static unsigned get_kernel_HZ(void)
{
	//char buf[64];
	struct sysinfo info;

	if (kernel_HZ)
		return kernel_HZ;

	/* Works for ELF only, Linux 2.4.0+ */
	kernel_HZ = find_elf_note(AT_CLKTCK);
	if (kernel_HZ == (unsigned)-1)
		kernel_HZ = get_HZ_by_waiting();

	//if (open_read_close("/proc/uptime", buf, sizeof(buf) <= 0)
	//	bb_perror_msg_and_die("can't read %s", "/proc/uptime");
	//buf[sizeof(buf)-1] = '\0';
	///sscanf(buf, "%llu", &seconds_since_boot);
	sysinfo(&info);
	seconds_since_boot = info.uptime;

	return kernel_HZ;
}
#endif

/* Print value to buf, max size+1 chars (including trailing '\0') */

static void func_user(char *buf, int size, const procps_status_t *ps)
{
#if 1
	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
#else
	/* "compatible" version, but it's larger */
	/* procps 2.18 shows numeric UID if name overflows the field */
	/* TODO: get_cached_username() returns numeric string if
	 * user has no passwd record, we will display it
	 * left-justified here; too long usernames are shown
	 * as _right-justified_ IDs. Is it worth fixing? */
	const char *user = get_cached_username(ps->uid);
	if (strlen(user) <= size)
		safe_strncpy(buf, user, size+1);
	else
		sprintf(buf, "%*u", size, (unsigned)ps->uid);
#endif
}

static void func_group(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
}

static void func_comm(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, ps->comm, size+1);
}

static void func_args(char *buf, int size, const procps_status_t *ps)
{
	read_cmdline(buf, size+1, ps->pid, ps->comm);
}

static void func_pid(char *buf, int size, const procps_status_t *ps)
{
	sprintf(buf, "%*u", size, ps->pid);
}

static void func_ppid(char *buf, int size, const procps_status_t *ps)
{
	sprintf(buf, "%*u", size, ps->ppid);
}

static void func_pgid(char *buf, int size, const procps_status_t *ps)
{
	sprintf(buf, "%*u", size, ps->pgid);
}

static void put_lu(char *buf, int size, unsigned long u)
{
	char buf4[5];

	/* see http://en.wikipedia.org/wiki/Tera */
	smart_ulltoa4(u, buf4, " mgtpezy");
	buf4[4] = '\0';
	sprintf(buf, "%.*s", size, buf4);
}

static void func_vsz(char *buf, int size, const procps_status_t *ps)
{
	put_lu(buf, size, ps->vsz);
}

static void func_rss(char *buf, int size, const procps_status_t *ps)
{
	put_lu(buf, size, ps->rss);
}

static void func_tty(char *buf, int size, const procps_status_t *ps)
{
	buf[0] = '?';
	buf[1] = '\0';
	if (ps->tty_major) /* tty field of "0" means "no tty" */
		snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
}


#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS

static void func_rgroup(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
}

static void func_ruser(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
}

static void func_nice(char *buf, int size, const procps_status_t *ps)
{
	sprintf(buf, "%*d", size, ps->niceness);
}

#endif /* FEATURE_PS_ADDITIONAL_COLUMNS */

#if ENABLE_FEATURE_PS_TIME
static void func_etime(char *buf, int size, const procps_status_t *ps)
{
	/* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
	unsigned long mm;
	unsigned ss;

	mm = ps->start_time / get_kernel_HZ();
	/* must be after get_kernel_HZ()! */
	mm = seconds_since_boot - mm;
	ss = mm % 60;
	mm /= 60;
	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}

static void func_time(char *buf, int size, const procps_status_t *ps)
{
	/* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
	unsigned long mm;
	unsigned ss;

	mm = (ps->utime + ps->stime) / get_kernel_HZ();
	ss = mm % 60;
	mm /= 60;
	snprintf(buf, size+1, "%3lu:%02u", mm, ss);
}
#endif

#if ENABLE_SELINUX
static void func_label(char *buf, int size, const procps_status_t *ps)
{
	safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
}
#endif

/*
static void func_nice(char *buf, int size, const procps_status_t *ps)
{
	ps->???
}

static void func_pcpu(char *buf, int size, const procps_status_t *ps)
{
}
*/

static const ps_out_t out_spec[] = {
// Mandated by POSIX:
	{ 8                  , "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID  },
	{ 8                  , "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID  },
	{ 16                 , "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM    },
	{ MAX_WIDTH          , "args"  ,"COMMAND",func_args  ,PSSCAN_COMM    },
	{ 5                  , "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID     },
	{ 5                  , "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID    },
	{ 5                  , "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID    },
#if ENABLE_FEATURE_PS_TIME
	{ sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
#endif
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
	{ 5                  , "nice"  ,"NI"     ,func_nice  ,PSSCAN_NICE    },
	{ 8                  , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
	{ 8                  , "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_RUIDGID },
//	{ 5                  , "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_        },
#endif
#if ENABLE_FEATURE_PS_TIME
	{ 6                  , "time"  ,"TIME"   ,func_time  ,PSSCAN_STIME | PSSCAN_UTIME },
#endif
	{ 6                  , "tty"   ,"TT"     ,func_tty   ,PSSCAN_TTY     },
	{ 4                  , "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ     },
// Not mandated by POSIX, but useful:
	{ 4                  , "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS     },
#if ENABLE_SELINUX
	{ 35                 , "label" ,"LABEL"  ,func_label ,PSSCAN_CONTEXT },
#endif
};

static ps_out_t* new_out_t(void)
{
	out = xrealloc_vector(out, 2, out_cnt);
	return &out[out_cnt++];
}

static const ps_out_t* find_out_spec(const char *name)
{
	unsigned i;
	for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
		if (!strncmp(name, out_spec[i].name6, 6))
			return &out_spec[i];
	}
	bb_error_msg_and_die("bad -o argument '%s'", name);
}

static void parse_o(char* opt)
{
	ps_out_t* new;
	// POSIX: "-o is blank- or comma-separated list" (FIXME)
	char *comma, *equal;
	while (1) {
		comma = strchr(opt, ',');
		equal = strchr(opt, '=');
		if (comma && (!equal || equal > comma)) {
			*comma = '\0';
			*new_out_t() = *find_out_spec(opt);
			*comma = ',';
			opt = comma + 1;
			continue;
		}
		break;
	}
	// opt points to last spec in comma separated list.
	// This one can have =HEADER part.
	new = new_out_t();
	if (equal)
		*equal = '\0';
	*new = *find_out_spec(opt);
	if (equal) {
		*equal = '=';
		new->header = equal + 1;
		// POSIX: the field widths shall be ... at least as wide as
		// the header text (default or overridden value).
		// If the header text is null, such as -o user=,
		// the field width shall be at least as wide as the
		// default header text
		if (new->header[0]) {
			new->width = strlen(new->header);
			print_header = 1;
		}
	} else
		print_header = 1;
}

static void alloc_line_buffer(void)
{
	int i;
	int width = 0;
	for (i = 0; i < out_cnt; i++) {
		need_flags |= out[i].ps_flags;
		if (out[i].header[0]) {
			print_header = 1;
		}
		width += out[i].width + 1; /* "FIELD " */
		if ((int)(width - terminal_width) > 0) {
			/* The rest does not fit on the screen */
			//out[i].width -= (width - terminal_width - 1);
			out_cnt = i + 1;
			break;
		}
	}
#if ENABLE_SELINUX
	if (!is_selinux_enabled())
		need_flags &= ~PSSCAN_CONTEXT;
#endif
	buffer = xmalloc(width + 1); /* for trailing \0 */
}

static void format_header(void)
{
	int i;
	ps_out_t* op;
	char *p;

	if (!print_header)
		return;
	p = buffer;
	i = 0;
	if (out_cnt) {
		while (1) {
			op = &out[i];
			if (++i == out_cnt) /* do not pad last field */
				break;
			p += sprintf(p, "%-*s ", op->width, op->header);
		}
		strcpy(p, op->header);
	}
	printf("%.*s\n", terminal_width, buffer);
}

static void format_process(const procps_status_t *ps)
{
	int i, len;
	char *p = buffer;
	i = 0;
	if (out_cnt) while (1) {
		out[i].f(p, out[i].width, ps);
		// POSIX: Any field need not be meaningful in all
		// implementations. In such a case a hyphen ( '-' )
		// should be output in place of the field value.
		if (!p[0]) {
			p[0] = '-';
			p[1] = '\0';
		}
		len = strlen(p);
		p += len;
		len = out[i].width - len + 1;
		if (++i == out_cnt) /* do not pad last field */
			break;
		p += sprintf(p, "%*s", len, "");
	}
	printf("%.*s\n", terminal_width, buffer);
}

int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv)
{
	procps_status_t *p;
	llist_t* opt_o = NULL;
	int opt;
	enum {
		OPT_Z = (1 << 0),
		OPT_o = (1 << 1),
		OPT_a = (1 << 2),
		OPT_A = (1 << 3),
		OPT_d = (1 << 4),
		OPT_e = (1 << 5),
		OPT_f = (1 << 6),
		OPT_l = (1 << 7),
		OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
	};

	INIT_G();

	// POSIX:
	// -a  Write information for all processes associated with terminals
	//     Implementations may omit session leaders from this list
	// -A  Write information for all processes
	// -d  Write information for all processes, except session leaders
	// -e  Write information for all processes (equivalent to -A)
	// -f  Generate a full listing
	// -l  Generate a long listing
	// -o col1,col2,col3=header
	//     Select which columns to display
	/* We allow (and ignore) most of the above. FIXME */
	opt_complementary = "o::";
	opt = getopt32(argv, "Zo:aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
	if (opt_o) {
		do {
			parse_o(llist_pop(&opt_o));
		} while (opt_o);
	} else {
		/* Below: parse_o() needs char*, NOT const char*... */
#if ENABLE_SELINUX
		if (!(opt & OPT_Z) || !is_selinux_enabled()) {
			/* no -Z or no SELinux: do not show LABEL */
			strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
		} else
#endif
		{
			strcpy(default_o, DEFAULT_O_STR);
		}
		parse_o(default_o);
	}
#if ENABLE_FEATURE_SHOW_THREADS
	if (opt & OPT_T)
		need_flags |= PSSCAN_TASKS;
#endif

	/* Was INT_MAX, but some libc's go belly up with printf("%.*s")
	 * and such large widths */
	terminal_width = MAX_WIDTH;
	if (isatty(1)) {
		get_terminal_width_height(0, &terminal_width, NULL);
		if (--terminal_width > MAX_WIDTH)
			terminal_width = MAX_WIDTH;
	}
	alloc_line_buffer();
	format_header();

	p = NULL;
	while ((p = procps_scan(p, need_flags)) != NULL) {
		format_process(p);
	}

	return EXIT_SUCCESS;
}


#else /* !ENABLE_DESKTOP */


int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
	procps_status_t *p;
	int len;
	int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
			| PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
#if !ENABLE_FEATURE_PS_WIDE
	enum { terminal_width = 79 };
#else
	unsigned terminal_width;
#endif

#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
	int opts;
# if ENABLE_FEATURE_PS_WIDE
	int w_count = 0;
	opt_complementary = "-:ww";
	opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")"w", &w_count);
	/* if w is given once, GNU ps sets the width to 132,
	 * if w is given more than once, it is "unlimited"
	 */
	if (w_count) {
		terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
	} else {
		get_terminal_width_height(0, &terminal_width, NULL);
		/* Go one less... */
		if (--terminal_width > MAX_WIDTH)
			terminal_width = MAX_WIDTH;
	}
# else /* only ENABLE_SELINUX */
	opts = getopt32(argv, "Z"IF_FEATURE_SHOW_THREADS("T"));
# endif
# if ENABLE_SELINUX
	if ((opts & 1) && is_selinux_enabled())
		psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
				| PSSCAN_STATE | PSSCAN_COMM;
# endif
# if ENABLE_FEATURE_SHOW_THREADS
	if (opts & (1 << ENABLE_SELINUX))
		psscan_flags |= PSSCAN_TASKS;
# endif
#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */

	if (psscan_flags & PSSCAN_CONTEXT)
		puts("  PID CONTEXT                          STAT COMMAND");
	else
		puts("  PID USER       VSZ STAT COMMAND");

	p = NULL;
	while ((p = procps_scan(p, psscan_flags)) != NULL) {
#if ENABLE_SELINUX
		if (psscan_flags & PSSCAN_CONTEXT) {
			len = printf("%5u %-32.32s %s  ",
					p->pid,
					p->context ? p->context : "unknown",
					p->state);
		} else
#endif
		{
			const char *user = get_cached_username(p->uid);
			//if (p->vsz == 0)
			//	len = printf("%5u %-8.8s        %s ",
			//		p->pid, user, p->state);
			//else
			{
				char buf6[6];
				smart_ulltoa5(p->vsz, buf6, " mgtpezy");
				buf6[5] = '\0';
				len = printf("%5u %-8.8s %s %s  ",
					p->pid, user, buf6, p->state);
			}
		}

		{
			int sz = terminal_width - len;
			char buf[sz + 1];
			read_cmdline(buf, sz, p->pid, p->comm);
			puts(buf);
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		clear_username_cache();
	return EXIT_SUCCESS;
}

#endif /* ENABLE_DESKTOP */