busybox/procps/ps.c

/* vi: set sw=4 ts=4: */
/*
 * Mini ps implementation(s) for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
 */

#include "busybox.h"

#if ENABLE_DESKTOP

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

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

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

void func_args(char *buf, int size, const procps_status_t *ps)
{
	buf[0] = '\0';
	if (ps->cmd)
		safe_strncpy(buf, ps->cmd, size+1);
	else if (size >= 2)
		snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
}

void func_pid(char *buf, int size, const procps_status_t *ps)
{
	snprintf(buf, size+1, "%*u", size, ps->pid);
}

void func_ppid(char *buf, int size, const procps_status_t *ps)
{
	snprintf(buf, size+1, "%*u", size, ps->ppid);
}

void func_pgid(char *buf, int size, const procps_status_t *ps)
{
	snprintf(buf, size+1, "%*u", size, ps->pgid);
}

void func_rss(char *buf, int size, const procps_status_t *ps)
{
	char buf5[5];
	smart_ulltoa5( ((unsigned long long)ps->rss) << 10, buf5);
	snprintf(buf, size+1, "%.*s", size, buf5);
}

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

void func_etime(char *buf, int size, const procps_status_t *ps)
{
	elapled time [[dd-]hh:]mm:ss
}

void func_time(char *buf, int size, const procps_status_t *ps)
{
	cumulative time [[dd-]hh:]mm:ss
}

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

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

typedef struct {
	char name[8];
	const char *header;
	void (*f)(char *buf, int size, const procps_status_t *ps);
	int ps_flags;
	int width;
} ps_out_t;

static const ps_out_t out_spec[] = {
// Mandated by POSIX:
	{ "user"  ,"USER"   ,func_user  ,PSSCAN_UIDGID,8                   },
	{ "comm"  ,"COMMAND",func_comm  ,PSSCAN_COMM  ,16                  },
	{ "args"  ,"COMMAND",func_args  ,PSSCAN_CMD|PSSCAN_COMM,256        },
	{ "pid"   ,"PID"    ,func_pid   ,PSSCAN_PID   ,5                   },
	{ "ppid"  ,"PPID"   ,func_ppid  ,PSSCAN_PPID  ,5                   },
	{ "pgid"  ,"PGID"   ,func_pgid  ,PSSCAN_PGID  ,5                   },
//	{ "etime" ,"ELAPSED",func_etime ,PSSCAN_      ,sizeof("ELAPSED")-1 },
//	{ "group" ,"GROUP"  ,func_group ,PSSCAN_UIDGID,sizeof("GROUP"  )-1 },
//	{ "nice"  ,"NI"     ,func_nice  ,PSSCAN_      ,sizeof("NI"     )-1 },
//	{ "pcpu"  ,"%CPU"   ,func_pcpu  ,PSSCAN_      ,sizeof("%CPU"   )-1 },
//	{ "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
//	{ "ruser" ,"RUSER"  ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER"  )-1 },
//	{ "time"  ,"TIME"   ,func_time  ,PSSCAN_      ,sizeof("TIME"   )-1 },
//	{ "tty"   ,"TT"     ,func_tty   ,PSSCAN_      ,sizeof("TT"     )-1 },
//	{ "vsz"   ,"VSZ"    ,func_vsz   ,PSSCAN_VSZ   ,4                   },
// Not mandated by POSIX:
	{ "rss"   ,"RSS"    ,func_rss   ,PSSCAN_RSS   ,4                   },
};

#define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )

static ps_out_t* out;
static int out_cnt;
static int print_header;
static int ps_flags;
static char *buffer;
static unsigned terminal_width;


static ps_out_t* new_out_t(void)
{
	int i = out_cnt++;
	out = xrealloc(out, out_cnt * sizeof(*out));
	return &out[i];
}

static const ps_out_t* find_out_spec(const char *name)
{
	int i;
	for (i = 0; i < VEC_SIZE(out_spec); i++) {
		if (!strcmp(name, out_spec[i].name))
			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;
	}
	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 post_process(void)
{
	int i;
	int width = 0;
	for (i = 0; i < out_cnt; i++) {
		ps_flags |= out[i].ps_flags;
		if (out[i].header[0]) {
			print_header = 1;
		}
		width += out[i].width + 1; /* "FIELD " */
	}
	buffer = xmalloc(width + 1); /* for trailing \0 */
}

static void format_header(void)
{
	int i;
	ps_out_t* op;
	char *p = buffer;
	if (!print_header)
		return;
	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);
}

/* Cannot be const: parse_o() will choke */
static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";

int ps_main(int argc, char **argv)
{
	procps_status_t *p;
	llist_t* opt_o = NULL;

	// 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 distplay
	/* We allow (and ignore) most of the above. FIXME */
	opt_complementary = "o::";
	getopt32(argc, argv, "o:aAdefl", &opt_o);
	if (opt_o) {
		opt_o = rev_llist(opt_o);
		do {
			parse_o(opt_o->data);
			opt_o = opt_o->link;
		} while (opt_o);
	} else
		parse_o(default_o);
	post_process();

	terminal_width = INT_MAX;
	if (isatty(1)) {
		get_terminal_width_height(1, &terminal_width, NULL);
		terminal_width--;
	}
	format_header();

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

	return EXIT_SUCCESS;
}


#else /* !ENABLE_DESKTOP */


int ps_main(int argc, char **argv)
{
	procps_status_t *p = NULL;
	int i, len;
	SKIP_SELINUX(const) int use_selinux = 0;
	USE_SELINUX(security_context_t sid = NULL;)
#if !ENABLE_FEATURE_PS_WIDE
	enum { terminal_width = 79 };
#else
	int terminal_width;
	int w_count = 0;
#endif

#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
#if ENABLE_FEATURE_PS_WIDE
	opt_complementary = "-:ww";
	USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("c") "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 : INT_MAX;
	} else {
		get_terminal_width_height(1, &terminal_width, NULL);
		/* Go one less... */
		terminal_width--;
	}
#else /* only ENABLE_SELINUX */
	i = getopt32(argc, argv, "c");
#endif
#if ENABLE_SELINUX
	if ((i & 1) && is_selinux_enabled())
		use_selinux = 1;
#endif
#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */

	if (use_selinux)
		puts("  PID Context                          Stat Command");
	else
		puts("  PID  Uid     VmSize Stat Command");

	while ((p = procps_scan(p, 0
			| PSSCAN_PID
			| PSSCAN_UIDGID
			| PSSCAN_STATE
			| PSSCAN_RSS
			| PSSCAN_CMD
	))) {
		char *namecmd = p->cmd;
#if ENABLE_SELINUX
		if (use_selinux) {
			char sbuf[128];
			len = sizeof(sbuf);

			if (is_selinux_enabled()) {
				if (getpidcon(p->pid, &sid) < 0)
					sid = NULL;
			}

			if (sid) {
				/* I assume sid initialized with NULL */
				len = strlen(sid) + 1;
				safe_strncpy(sbuf, sid, len);
				freecon(sid);
				sid = NULL;
			} else {
				safe_strncpy(sbuf, "unknown", 7);
			}
			len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
		} else
#endif
		{
			const char *user = get_cached_username(p->uid);
			if (p->rss == 0)
				len = printf("%5u %-8s        %s ",
					p->pid, user, p->state);
			else
				len = printf("%5u %-8s %6ld %s ",
					p->pid, user, p->rss, p->state);
		}

		i = terminal_width-len;

		if (namecmd && namecmd[0]) {
			if (i < 0)
				i = 0;
			if (strlen(namecmd) > (size_t)i)
				namecmd[i] = 0;
			puts(namecmd);
		} else {
			namecmd = p->comm;
			if (i < 2)
				i = 2;
			if (strlen(namecmd) > ((size_t)i-2))
				namecmd[i-2] = 0;
			printf("[%s]\n", namecmd);
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		clear_username_cache();
	return EXIT_SUCCESS;
}

#endif /* ENABLE_DESKTOP */
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini ps implementation(s) for busybox
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	*
7	* Licensed under the GPL version 2, see the file LICENSE in this tarball.
8	*/
9
10	#include "busybox.h"
11
12	#if ENABLE_DESKTOP
13
14	/* Print value to buf, max size+1 chars (including trailing '\0') */
15
16	void func_user(char buf, int size, const procps_status_t ps)
17	{
18	safe_strncpy(buf, get_cached_username(ps->uid), size+1);
19	}
20
21	void func_comm(char buf, int size, const procps_status_t ps)
22	{
23	safe_strncpy(buf, ps->comm, size+1);
24	}
25
26	void func_args(char buf, int size, const procps_status_t ps)
27	{
28	buf[0] = '\0';
29	if (ps->cmd)
30	safe_strncpy(buf, ps->cmd, size+1);
31	else if (size >= 2)
32	snprintf(buf, size+1, "[%.*s]", size-2, ps->comm);
33	}
34
35	void func_pid(char buf, int size, const procps_status_t ps)
36	{
37	snprintf(buf, size+1, "%*u", size, ps->pid);
38	}
39
40	void func_ppid(char buf, int size, const procps_status_t ps)
41	{
42	snprintf(buf, size+1, "%*u", size, ps->ppid);
43	}
44
45	void func_pgid(char buf, int size, const procps_status_t ps)
46	{
47	snprintf(buf, size+1, "%*u", size, ps->pgid);
48	}
49
50	void func_rss(char buf, int size, const procps_status_t ps)
51	{
52	char buf5[5];
53	smart_ulltoa5( ((unsigned long long)ps->rss) << 10, buf5);
54	snprintf(buf, size+1, "%.*s", size, buf5);
55	}
56
57	/*
58	void func_nice(char buf, int size, const procps_status_t ps)
59	{
60	ps->???
61	}
62
63	void func_etime(char buf, int size, const procps_status_t ps)
64	{
65	elapled time [[dd-]hh:]mm:ss
66	}
67
68	void func_time(char buf, int size, const procps_status_t ps)
69	{
70	cumulative time [[dd-]hh:]mm:ss
71	}
72
73	void func_pcpu(char buf, int size, const procps_status_t ps)
74	{
75	}
76
77	void func_tty(char buf, int size, const procps_status_t ps)
78	{
79	}
80	*/
81
82	typedef struct {
83	char name[8];
84	const char *header;
85	void (f)(char buf, int size, const procps_status_t *ps);
86	int ps_flags;
87	int width;
88	} ps_out_t;
89
90	static const ps_out_t out_spec[] = {
91	// Mandated by POSIX:
92	{ "user" ,"USER" ,func_user ,PSSCAN_UIDGID,8 },
93	{ "comm" ,"COMMAND",func_comm ,PSSCAN_COMM ,16 },
94	{ "args" ,"COMMAND",func_args ,PSSCAN_CMD\|PSSCAN_COMM,256 },
95	{ "pid" ,"PID" ,func_pid ,PSSCAN_PID ,5 },
96	{ "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID ,5 },
97	{ "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID ,5 },
98	// { "etime" ,"ELAPSED",func_etime ,PSSCAN_ ,sizeof("ELAPSED")-1 },
99	// { "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID,sizeof("GROUP" )-1 },
100	// { "nice" ,"NI" ,func_nice ,PSSCAN_ ,sizeof("NI" )-1 },
101	// { "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ ,sizeof("%CPU" )-1 },
102	// { "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID,sizeof("RGROUP" )-1 },
103	// { "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID,sizeof("RUSER" )-1 },
104	// { "time" ,"TIME" ,func_time ,PSSCAN_ ,sizeof("TIME" )-1 },
105	// { "tty" ,"TT" ,func_tty ,PSSCAN_ ,sizeof("TT" )-1 },
106	// { "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ ,4 },
107	// Not mandated by POSIX:
108	{ "rss" ,"RSS" ,func_rss ,PSSCAN_RSS ,4 },
109	};
110
111	#define VEC_SIZE(v) ( sizeof(v) / sizeof((v)[0]) )
112
113	static ps_out_t* out;
114	static int out_cnt;
115	static int print_header;
116	static int ps_flags;
117	static char *buffer;
118	static unsigned terminal_width;
119
120
121	static ps_out_t* new_out_t(void)
122	{
123	int i = out_cnt++;
124	out = xrealloc(out, out_cnt * sizeof(*out));
125	return &out[i];
126	}
127
128	static const ps_out_t* find_out_spec(const char *name)
129	{
130	int i;
131	for (i = 0; i < VEC_SIZE(out_spec); i++) {
132	if (!strcmp(name, out_spec[i].name))
133	return &out_spec[i];
134	}
135	bb_error_msg_and_die("bad -o argument '%s'", name);
136	}
137
138	static void parse_o(char* opt)
139	{
140	ps_out_t* new;
141	// POSIX: "-o is blank- or comma-separated list" (FIXME)
142	char comma, equal;
143	while (1) {
144	comma = strchr(opt, ',');
145	equal = strchr(opt, '=');
146	if (comma && (!equal \|\| equal > comma)) {
147	*comma = '\0';
148	new_out_t() = find_out_spec(opt);
149	*comma = ',';
150	opt = comma + 1;
151	continue;
152	}
153	break;
154	}
155	new = new_out_t();
156	if (equal)
157	*equal = '\0';
158	new = find_out_spec(opt);
159	if (equal) {
160	*equal = '=';
161	new->header = equal + 1;
162	// POSIX: the field widths shall be ... at least as wide as
163	// the header text (default or overridden value).
164	// If the header text is null, such as -o user=,
165	// the field width shall be at least as wide as the
166	// default header text
167	if (new->header[0]) {
168	new->width = strlen(new->header);
169	print_header = 1;
170	}
171	} else
172	print_header = 1;
173	}
174
175	static void post_process(void)
176	{
177	int i;
178	int width = 0;
179	for (i = 0; i < out_cnt; i++) {
180	ps_flags \|= out[i].ps_flags;
181	if (out[i].header[0]) {
182	print_header = 1;
183	}
184	width += out[i].width + 1; /* "FIELD " */
185	}
186	buffer = xmalloc(width + 1); /* for trailing \0 */
187	}
188
189	static void format_header(void)
190	{
191	int i;
192	ps_out_t* op;
193	char *p = buffer;
194	if (!print_header)
195	return;
196	i = 0;
197	if (out_cnt) {
198	while (1) {
199	op = &out[i];
200	if (++i == out_cnt) /* do not pad last field */
201	break;
202	p += sprintf(p, "%-*s ", op->width, op->header);
203	}
204	strcpy(p, op->header);
205	}
206	printf("%.*s\n", terminal_width, buffer);
207	}
208
209	static void format_process(const procps_status_t *ps)
210	{
211	int i, len;
212	char *p = buffer;
213	i = 0;
214	if (out_cnt) while (1) {
215	out[i].f(p, out[i].width, ps);
216	// POSIX: Any field need not be meaningful in all
217	// implementations. In such a case a hyphen ( '-' )
218	// should be output in place of the field value.
219	if (!p[0]) {
220	p[0] = '-';
221	p[1] = '\0';
222	}
223	len = strlen(p);
224	p += len;
225	len = out[i].width - len + 1;
226	if (++i == out_cnt) /* do not pad last field */
227	break;
228	p += sprintf(p, "%*s", len, "");
229	}
230	printf("%.*s\n", terminal_width, buffer);
231	}
232
233	/* Cannot be const: parse_o() will choke */
234	static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";
235
236	int ps_main(int argc, char **argv)
237	{
238	procps_status_t *p;
239	llist_t* opt_o = NULL;
240
241	// POSIX:
242	// -a Write information for all processes associated with terminals
243	// Implementations may omit session leaders from this list
244	// -A Write information for all processes
245	// -d Write information for all processes, except session leaders
246	// -e Write information for all processes (equivalent to -A.)
247	// -f Generate a full listing
248	// -l Generate a long listing
249	// -o col1,col2,col3=header
250	// Select which columns to distplay
251	/* We allow (and ignore) most of the above. FIXME */
252	opt_complementary = "o::";
253	getopt32(argc, argv, "o:aAdefl", &opt_o);
254	if (opt_o) {
255	opt_o = rev_llist(opt_o);
256	do {
257	parse_o(opt_o->data);
258	opt_o = opt_o->link;
259	} while (opt_o);
260	} else
261	parse_o(default_o);
262	post_process();
263
264	terminal_width = INT_MAX;
265	if (isatty(1)) {
266	get_terminal_width_height(1, &terminal_width, NULL);
267	terminal_width--;
268	}
269	format_header();
270
271	p = NULL;
272	while ((p = procps_scan(p, ps_flags))) {
273	format_process(p);
274	}
275
276	return EXIT_SUCCESS;
277	}
278
279
280	#else /* !ENABLE_DESKTOP */
281
282
283	int ps_main(int argc, char **argv)
284	{
285	procps_status_t *p = NULL;
286	int i, len;
287	SKIP_SELINUX(const) int use_selinux = 0;
288	USE_SELINUX(security_context_t sid = NULL;)
289	#if !ENABLE_FEATURE_PS_WIDE
290	enum { terminal_width = 79 };
291	#else
292	int terminal_width;
293	int w_count = 0;
294	#endif
295
296	#if ENABLE_FEATURE_PS_WIDE \|\| ENABLE_SELINUX
297	#if ENABLE_FEATURE_PS_WIDE
298	opt_complementary = "-:ww";
299	USE_SELINUX(i =) getopt32(argc, argv, USE_SELINUX("c") "w", &w_count);
300	/* if w is given once, GNU ps sets the width to 132,
301	* if w is given more than once, it is "unlimited"
302	*/
303	if (w_count) {
304	terminal_width = (w_count==1) ? 132 : INT_MAX;
305	} else {
306	get_terminal_width_height(1, &terminal_width, NULL);
307	/* Go one less... */
308	terminal_width--;
309	}
310	#else /* only ENABLE_SELINUX */
311	i = getopt32(argc, argv, "c");
312	#endif
313	#if ENABLE_SELINUX
314	if ((i & 1) && is_selinux_enabled())
315	use_selinux = 1;
316	#endif
317	#endif /* ENABLE_FEATURE_PS_WIDE \|\| ENABLE_SELINUX */
318
319	if (use_selinux)
320	puts(" PID Context Stat Command");
321	else
322	puts(" PID Uid VmSize Stat Command");
323
324	while ((p = procps_scan(p, 0
325	\| PSSCAN_PID
326	\| PSSCAN_UIDGID
327	\| PSSCAN_STATE
328	\| PSSCAN_RSS
329	\| PSSCAN_CMD
330	))) {
331	char *namecmd = p->cmd;
332	#if ENABLE_SELINUX
333	if (use_selinux) {
334	char sbuf[128];
335	len = sizeof(sbuf);
336
337	if (is_selinux_enabled()) {
338	if (getpidcon(p->pid, &sid) < 0)
339	sid = NULL;
340	}
341
342	if (sid) {
343	/* I assume sid initialized with NULL */
344	len = strlen(sid) + 1;
345	safe_strncpy(sbuf, sid, len);
346	freecon(sid);
347	sid = NULL;
348	} else {
349	safe_strncpy(sbuf, "unknown", 7);
350	}
351	len = printf("%5u %-32s %s ", p->pid, sbuf, p->state);
352	} else
353	#endif
354	{
355	const char *user = get_cached_username(p->uid);
356	if (p->rss == 0)
357	len = printf("%5u %-8s %s ",
358	p->pid, user, p->state);
359	else
360	len = printf("%5u %-8s %6ld %s ",
361	p->pid, user, p->rss, p->state);
362	}
363
364	i = terminal_width-len;
365
366	if (namecmd && namecmd[0]) {
367	if (i < 0)
368	i = 0;
369	if (strlen(namecmd) > (size_t)i)
370	namecmd[i] = 0;
371	puts(namecmd);
372	} else {
373	namecmd = p->comm;
374	if (i < 2)
375	i = 2;
376	if (strlen(namecmd) > ((size_t)i-2))
377	namecmd[i-2] = 0;
378	printf("[%s]\n", namecmd);
379	}
380	}
381	if (ENABLE_FEATURE_CLEAN_UP)
382	clear_username_cache();
383	return EXIT_SUCCESS;
384	}
385
386	#endif /* ENABLE_DESKTOP */