source: MondoRescue/branches/2.2.5/mindi-busybox/procps/ps.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 10.5 KB
Line 
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 * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
7 (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
8 *
9 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
10 */
11
12#include "libbb.h"
13
14/* Absolute maximum on output line length */
15enum { MAX_WIDTH = 2*1024 };
16
17#if ENABLE_DESKTOP
18
19/* Print value to buf, max size+1 chars (including trailing '\0') */
20
21static void func_user(char *buf, int size, const procps_status_t *ps)
22{
23 safe_strncpy(buf, get_cached_username(ps->uid), size+1);
24}
25
26static void func_comm(char *buf, int size, const procps_status_t *ps)
27{
28 safe_strncpy(buf, ps->comm, size+1);
29}
30
31static void func_args(char *buf, int size, const procps_status_t *ps)
32{
33 read_cmdline(buf, size, ps->pid, ps->comm);
34}
35
36static void func_pid(char *buf, int size, const procps_status_t *ps)
37{
38 sprintf(buf, "%*u", size, ps->pid);
39}
40
41static void func_ppid(char *buf, int size, const procps_status_t *ps)
42{
43 sprintf(buf, "%*u", size, ps->ppid);
44}
45
46static void func_pgid(char *buf, int size, const procps_status_t *ps)
47{
48 sprintf(buf, "%*u", size, ps->pgid);
49}
50
51static void put_u(char *buf, int size, unsigned u)
52{
53 char buf5[5];
54 smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
55 sprintf(buf, "%.*s", size, buf5);
56}
57
58static void func_vsz(char *buf, int size, const procps_status_t *ps)
59{
60 put_u(buf, size, ps->vsz);
61}
62
63static void func_rss(char *buf, int size, const procps_status_t *ps)
64{
65 put_u(buf, size, ps->rss);
66}
67
68static void func_tty(char *buf, int size, const procps_status_t *ps)
69{
70 buf[0] = '?';
71 buf[1] = '\0';
72 if (ps->tty_major) /* tty field of "0" means "no tty" */
73 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
74}
75
76#if ENABLE_SELINUX
77static void func_label(char *buf, int size, const procps_status_t *ps)
78{
79 safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
80}
81#endif
82
83/*
84static void func_nice(char *buf, int size, const procps_status_t *ps)
85{
86 ps->???
87}
88
89static void func_etime(char *buf, int size, const procps_status_t *ps)
90{
91 elapled time [[dd-]hh:]mm:ss
92}
93
94static void func_time(char *buf, int size, const procps_status_t *ps)
95{
96 cumulative time [[dd-]hh:]mm:ss
97}
98
99static void func_pcpu(char *buf, int size, const procps_status_t *ps)
100{
101}
102*/
103
104typedef struct {
105 uint16_t width;
106 char name[6];
107 const char *header;
108 void (*f)(char *buf, int size, const procps_status_t *ps);
109 int ps_flags;
110} ps_out_t;
111
112static const ps_out_t out_spec[] = {
113// Mandated by POSIX:
114 { 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
115 { 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
116 { 256 , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
117 { 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
118 { 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
119 { 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
120// { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_ },
121// { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
122// { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
123// { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
124// { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
125// { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
126// { sizeof("TIME" )-1, "time" ,"TIME" ,func_time ,PSSCAN_ },
127 { 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
128 { 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
129// Not mandated by POSIX, but useful:
130 { 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
131#if ENABLE_SELINUX
132 { 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
133#endif
134};
135
136#if ENABLE_SELINUX
137#define SELINIX_O_PREFIX "label,"
138#define DEFAULT_O_STR SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
139#else
140#define DEFAULT_O_STR "pid,user" /* TODO: ,vsz,stat */ ",args"
141#endif
142
143struct globals {
144 ps_out_t* out;
145 int out_cnt;
146 int print_header;
147 int need_flags;
148 char *buffer;
149 unsigned terminal_width;
150 char default_o[sizeof(DEFAULT_O_STR)];
151};
152#define G (*(struct globals*)&bb_common_bufsiz1)
153#define out (G.out )
154#define out_cnt (G.out_cnt )
155#define print_header (G.print_header )
156#define need_flags (G.need_flags )
157#define buffer (G.buffer )
158#define terminal_width (G.terminal_width)
159#define default_o (G.default_o )
160
161static ps_out_t* new_out_t(void)
162{
163 int i = out_cnt++;
164 out = xrealloc(out, out_cnt * sizeof(*out));
165 return &out[i];
166}
167
168static const ps_out_t* find_out_spec(const char *name)
169{
170 int i;
171 for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
172 if (!strcmp(name, out_spec[i].name))
173 return &out_spec[i];
174 }
175 bb_error_msg_and_die("bad -o argument '%s'", name);
176}
177
178static void parse_o(char* opt)
179{
180 ps_out_t* new;
181 // POSIX: "-o is blank- or comma-separated list" (FIXME)
182 char *comma, *equal;
183 while (1) {
184 comma = strchr(opt, ',');
185 equal = strchr(opt, '=');
186 if (comma && (!equal || equal > comma)) {
187 *comma = '\0';
188 *new_out_t() = *find_out_spec(opt);
189 *comma = ',';
190 opt = comma + 1;
191 continue;
192 }
193 break;
194 }
195 // opt points to last spec in comma separated list.
196 // This one can have =HEADER part.
197 new = new_out_t();
198 if (equal)
199 *equal = '\0';
200 *new = *find_out_spec(opt);
201 if (equal) {
202 *equal = '=';
203 new->header = equal + 1;
204 // POSIX: the field widths shall be ... at least as wide as
205 // the header text (default or overridden value).
206 // If the header text is null, such as -o user=,
207 // the field width shall be at least as wide as the
208 // default header text
209 if (new->header[0]) {
210 new->width = strlen(new->header);
211 print_header = 1;
212 }
213 } else
214 print_header = 1;
215}
216
217static void post_process(void)
218{
219 int i;
220 int width = 0;
221 for (i = 0; i < out_cnt; i++) {
222 need_flags |= out[i].ps_flags;
223 if (out[i].header[0]) {
224 print_header = 1;
225 }
226 width += out[i].width + 1; /* "FIELD " */
227 }
228#if ENABLE_SELINUX
229 if (!is_selinux_enabled())
230 need_flags &= ~PSSCAN_CONTEXT;
231#endif
232 buffer = xmalloc(width + 1); /* for trailing \0 */
233}
234
235static void format_header(void)
236{
237 int i;
238 ps_out_t* op;
239 char *p;
240
241 if (!print_header)
242 return;
243 p = buffer;
244 i = 0;
245 if (out_cnt) {
246 while (1) {
247 op = &out[i];
248 if (++i == out_cnt) /* do not pad last field */
249 break;
250 p += sprintf(p, "%-*s ", op->width, op->header);
251 }
252 strcpy(p, op->header);
253 }
254 printf("%.*s\n", terminal_width, buffer);
255}
256
257static void format_process(const procps_status_t *ps)
258{
259 int i, len;
260 char *p = buffer;
261 i = 0;
262 if (out_cnt) while (1) {
263 out[i].f(p, out[i].width, ps);
264 // POSIX: Any field need not be meaningful in all
265 // implementations. In such a case a hyphen ( '-' )
266 // should be output in place of the field value.
267 if (!p[0]) {
268 p[0] = '-';
269 p[1] = '\0';
270 }
271 len = strlen(p);
272 p += len;
273 len = out[i].width - len + 1;
274 if (++i == out_cnt) /* do not pad last field */
275 break;
276 p += sprintf(p, "%*s", len, "");
277 }
278 printf("%.*s\n", terminal_width, buffer);
279}
280
281int ps_main(int argc, char **argv);
282int ps_main(int argc, char **argv)
283{
284 procps_status_t *p;
285 llist_t* opt_o = NULL;
286 USE_SELINUX(int opt;)
287
288 // POSIX:
289 // -a Write information for all processes associated with terminals
290 // Implementations may omit session leaders from this list
291 // -A Write information for all processes
292 // -d Write information for all processes, except session leaders
293 // -e Write information for all processes (equivalent to -A.)
294 // -f Generate a full listing
295 // -l Generate a long listing
296 // -o col1,col2,col3=header
297 // Select which columns to display
298 /* We allow (and ignore) most of the above. FIXME */
299 opt_complementary = "o::";
300 USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
301 if (opt_o) {
302 do {
303 parse_o(opt_o->data);
304 opt_o = opt_o->link;
305 } while (opt_o);
306 } else {
307 /* Below: parse_o() needs char*, NOT const char*... */
308#if ENABLE_SELINUX
309 if (!(opt & 1) || !is_selinux_enabled()) {
310 /* no -Z or no SELinux: do not show LABEL */
311 strcpy(default_o, DEFAULT_O_STR + sizeof(SELINIX_O_PREFIX)-1);
312 } else
313#endif
314 {
315 strcpy(default_o, DEFAULT_O_STR);
316 }
317 parse_o(default_o);
318 }
319 post_process();
320
321 /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
322 * and such large widths */
323 terminal_width = MAX_WIDTH;
324 if (isatty(1)) {
325 get_terminal_width_height(0, &terminal_width, NULL);
326 if (--terminal_width > MAX_WIDTH)
327 terminal_width = MAX_WIDTH;
328 }
329 format_header();
330
331 p = NULL;
332 while ((p = procps_scan(p, need_flags))) {
333 format_process(p);
334 }
335
336 return EXIT_SUCCESS;
337}
338
339
340#else /* !ENABLE_DESKTOP */
341
342
343int ps_main(int argc, char **argv);
344int ps_main(int argc, char **argv)
345{
346 procps_status_t *p = NULL;
347 int len;
348 SKIP_SELINUX(const) int use_selinux = 0;
349 USE_SELINUX(int i;)
350#if !ENABLE_FEATURE_PS_WIDE
351 enum { terminal_width = 79 };
352#else
353 int terminal_width;
354 int w_count = 0;
355#endif
356
357#if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
358#if ENABLE_FEATURE_PS_WIDE
359 opt_complementary = "-:ww";
360 USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
361 /* if w is given once, GNU ps sets the width to 132,
362 * if w is given more than once, it is "unlimited"
363 */
364 if (w_count) {
365 terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
366 } else {
367 get_terminal_width_height(0, &terminal_width, NULL);
368 /* Go one less... */
369 if (--terminal_width > MAX_WIDTH)
370 terminal_width = MAX_WIDTH;
371 }
372#else /* only ENABLE_SELINUX */
373 i = getopt32(argv, "Z");
374#endif
375#if ENABLE_SELINUX
376 if ((i & 1) && is_selinux_enabled())
377 use_selinux = PSSCAN_CONTEXT;
378#endif
379#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
380
381 if (use_selinux)
382 puts(" PID Context Stat Command");
383 else
384 puts(" PID Uid VSZ Stat Command");
385
386 while ((p = procps_scan(p, 0
387 | PSSCAN_PID
388 | PSSCAN_UIDGID
389 | PSSCAN_STATE
390 | PSSCAN_VSZ
391 | PSSCAN_COMM
392 | use_selinux
393 ))) {
394#if ENABLE_SELINUX
395 if (use_selinux) {
396 len = printf("%5u %-32s %s ",
397 p->pid,
398 p->context ? p->context : "unknown",
399 p->state);
400 } else
401#endif
402 {
403 const char *user = get_cached_username(p->uid);
404 if (p->vsz == 0)
405 len = printf("%5u %-8s %s ",
406 p->pid, user, p->state);
407 else
408 len = printf("%5u %-8s %6u %s ",
409 p->pid, user, p->vsz, p->state);
410 }
411
412 {
413 int sz = terminal_width - len;
414 char buf[sz + 1];
415 read_cmdline(buf, sz, p->pid, p->comm);
416 puts(buf);
417 }
418 }
419 if (ENABLE_FEATURE_CLEAN_UP)
420 clear_username_cache();
421 return EXIT_SUCCESS;
422}
423
424#endif /* ENABLE_DESKTOP */
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