Contents of /tags/mkinitrd-6_3_2/busybox/procps/fuser.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
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File size: 6086 byte(s)
Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 6086 byte(s)
tagged 'mkinitrd-6_3_2'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * tiny fuser implementation |
4 | * |
5 | * Copyright 2004 Tony J. White |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | |
12 | #define MAX_LINE 255 |
13 | |
14 | #define OPTION_STRING "mks64" |
15 | enum { |
16 | OPT_MOUNT = (1 << 0), |
17 | OPT_KILL = (1 << 1), |
18 | OPT_SILENT = (1 << 2), |
19 | OPT_IP6 = (1 << 3), |
20 | OPT_IP4 = (1 << 4), |
21 | }; |
22 | |
23 | typedef struct inode_list { |
24 | struct inode_list *next; |
25 | ino_t inode; |
26 | dev_t dev; |
27 | } inode_list; |
28 | |
29 | typedef struct pid_list { |
30 | struct pid_list *next; |
31 | pid_t pid; |
32 | } pid_list; |
33 | |
34 | |
35 | struct globals { |
36 | pid_list *pid_list_head; |
37 | inode_list *inode_list_head; |
38 | }; |
39 | #define G (*(struct globals*)&bb_common_bufsiz1) |
40 | #define INIT_G() do { } while (0) |
41 | |
42 | |
43 | static void add_pid(const pid_t pid) |
44 | { |
45 | pid_list **curr = &G.pid_list_head; |
46 | |
47 | while (*curr) { |
48 | if ((*curr)->pid == pid) |
49 | return; |
50 | curr = &(*curr)->next; |
51 | } |
52 | |
53 | *curr = xzalloc(sizeof(pid_list)); |
54 | (*curr)->pid = pid; |
55 | } |
56 | |
57 | static void add_inode(const struct stat *st) |
58 | { |
59 | inode_list **curr = &G.inode_list_head; |
60 | |
61 | while (*curr) { |
62 | if ((*curr)->dev == st->st_dev |
63 | && (*curr)->inode == st->st_ino |
64 | ) { |
65 | return; |
66 | } |
67 | curr = &(*curr)->next; |
68 | } |
69 | |
70 | *curr = xzalloc(sizeof(inode_list)); |
71 | (*curr)->dev = st->st_dev; |
72 | (*curr)->inode = st->st_ino; |
73 | } |
74 | |
75 | static void scan_proc_net(const char *path, unsigned port) |
76 | { |
77 | char line[MAX_LINE + 1]; |
78 | long long uint64_inode; |
79 | unsigned tmp_port; |
80 | FILE *f; |
81 | struct stat st; |
82 | int fd; |
83 | |
84 | /* find socket dev */ |
85 | st.st_dev = 0; |
86 | fd = socket(AF_INET, SOCK_DGRAM, 0); |
87 | if (fd >= 0) { |
88 | fstat(fd, &st); |
89 | close(fd); |
90 | } |
91 | |
92 | f = fopen_for_read(path); |
93 | if (!f) |
94 | return; |
95 | |
96 | while (fgets(line, MAX_LINE, f)) { |
97 | char addr[68]; |
98 | if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x " |
99 | "%*x:%*x %*x %*d %*d %llu", |
100 | addr, &tmp_port, &uint64_inode) == 3 |
101 | ) { |
102 | int len = strlen(addr); |
103 | if (len == 8 && (option_mask32 & OPT_IP6)) |
104 | continue; |
105 | if (len > 8 && (option_mask32 & OPT_IP4)) |
106 | continue; |
107 | if (tmp_port == port) { |
108 | st.st_ino = uint64_inode; |
109 | add_inode(&st); |
110 | } |
111 | } |
112 | } |
113 | fclose(f); |
114 | } |
115 | |
116 | static int search_dev_inode(const struct stat *st) |
117 | { |
118 | inode_list *ilist = G.inode_list_head; |
119 | |
120 | while (ilist) { |
121 | if (ilist->dev == st->st_dev) { |
122 | if (option_mask32 & OPT_MOUNT) |
123 | return 1; |
124 | if (ilist->inode == st->st_ino) |
125 | return 1; |
126 | } |
127 | ilist = ilist->next; |
128 | } |
129 | return 0; |
130 | } |
131 | |
132 | static void scan_pid_maps(const char *fname, pid_t pid) |
133 | { |
134 | FILE *file; |
135 | char line[MAX_LINE + 1]; |
136 | int major, minor; |
137 | long long uint64_inode; |
138 | struct stat st; |
139 | |
140 | file = fopen_for_read(fname); |
141 | if (!file) |
142 | return; |
143 | |
144 | while (fgets(line, MAX_LINE, file)) { |
145 | if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3) |
146 | continue; |
147 | st.st_ino = uint64_inode; |
148 | if (major == 0 && minor == 0 && st.st_ino == 0) |
149 | continue; |
150 | st.st_dev = makedev(major, minor); |
151 | if (search_dev_inode(&st)) |
152 | add_pid(pid); |
153 | } |
154 | fclose(file); |
155 | } |
156 | |
157 | static void scan_link(const char *lname, pid_t pid) |
158 | { |
159 | struct stat st; |
160 | |
161 | if (stat(lname, &st) >= 0) { |
162 | if (search_dev_inode(&st)) |
163 | add_pid(pid); |
164 | } |
165 | } |
166 | |
167 | static void scan_dir_links(const char *dname, pid_t pid) |
168 | { |
169 | DIR *d; |
170 | struct dirent *de; |
171 | char *lname; |
172 | |
173 | d = opendir(dname); |
174 | if (!d) |
175 | return; |
176 | |
177 | while ((de = readdir(d)) != NULL) { |
178 | lname = concat_subpath_file(dname, de->d_name); |
179 | if (lname == NULL) |
180 | continue; |
181 | scan_link(lname, pid); |
182 | free(lname); |
183 | } |
184 | closedir(d); |
185 | } |
186 | |
187 | /* NB: does chdir internally */ |
188 | static void scan_proc_pids(void) |
189 | { |
190 | DIR *d; |
191 | struct dirent *de; |
192 | pid_t pid; |
193 | |
194 | xchdir("/proc"); |
195 | d = opendir("/proc"); |
196 | if (!d) |
197 | return; |
198 | |
199 | while ((de = readdir(d)) != NULL) { |
200 | pid = (pid_t)bb_strtou(de->d_name, NULL, 10); |
201 | if (errno) |
202 | continue; |
203 | if (chdir(de->d_name) < 0) |
204 | continue; |
205 | scan_link("cwd", pid); |
206 | scan_link("exe", pid); |
207 | scan_link("root", pid); |
208 | |
209 | scan_dir_links("fd", pid); |
210 | scan_dir_links("lib", pid); |
211 | scan_dir_links("mmap", pid); |
212 | |
213 | scan_pid_maps("maps", pid); |
214 | xchdir("/proc"); |
215 | } |
216 | closedir(d); |
217 | } |
218 | |
219 | int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
220 | int fuser_main(int argc UNUSED_PARAM, char **argv) |
221 | { |
222 | pid_list *plist; |
223 | pid_t mypid; |
224 | char **pp; |
225 | struct stat st; |
226 | unsigned port; |
227 | int opt; |
228 | int exitcode; |
229 | int killsig; |
230 | /* |
231 | fuser [OPTIONS] FILE or PORT/PROTO |
232 | Find processes which use FILEs or PORTs |
233 | -m Find processes which use same fs as FILEs |
234 | -4 Search only IPv4 space |
235 | -6 Search only IPv6 space |
236 | -s Don't display PIDs |
237 | -k Kill found processes |
238 | -SIGNAL Signal to send (default: KILL) |
239 | */ |
240 | /* Handle -SIGNAL. Oh my... */ |
241 | killsig = SIGKILL; /* yes, the default is not SIGTERM */ |
242 | pp = argv; |
243 | while (*++pp) { |
244 | char *arg = *pp; |
245 | if (arg[0] != '-') |
246 | continue; |
247 | if (arg[1] == '-' && arg[2] == '\0') /* "--" */ |
248 | break; |
249 | if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0') |
250 | continue; /* it's "-4" or "-6" */ |
251 | opt = get_signum(&arg[1]); |
252 | if (opt < 0) |
253 | continue; |
254 | /* "-SIGNAL" option found. Remove it and bail out */ |
255 | killsig = opt; |
256 | do { |
257 | pp[0] = arg = pp[1]; |
258 | pp++; |
259 | } while (arg); |
260 | break; |
261 | } |
262 | |
263 | opt_complementary = "-1"; /* at least one param */ |
264 | opt = getopt32(argv, OPTION_STRING); |
265 | argv += optind; |
266 | |
267 | pp = argv; |
268 | while (*pp) { |
269 | /* parse net arg */ |
270 | char path[20], tproto[5]; |
271 | if (sscanf(*pp, "%u/%4s", &port, tproto) != 2) |
272 | goto file; |
273 | sprintf(path, "/proc/net/%s", tproto); |
274 | if (access(path, R_OK) != 0) { /* PORT/PROTO */ |
275 | scan_proc_net(path, port); |
276 | } else { /* FILE */ |
277 | file: |
278 | xstat(*pp, &st); |
279 | add_inode(&st); |
280 | } |
281 | pp++; |
282 | } |
283 | |
284 | scan_proc_pids(); /* changes dir to "/proc" */ |
285 | |
286 | mypid = getpid(); |
287 | plist = G.pid_list_head; |
288 | while (1) { |
289 | if (!plist) |
290 | return EXIT_FAILURE; |
291 | if (plist->pid != mypid) |
292 | break; |
293 | plist = plist->next; |
294 | } |
295 | |
296 | exitcode = EXIT_SUCCESS; |
297 | do { |
298 | if (plist->pid != mypid) { |
299 | if (opt & OPT_KILL) { |
300 | if (kill(plist->pid, killsig) != 0) { |
301 | bb_perror_msg("kill pid %u", (unsigned)plist->pid); |
302 | exitcode = EXIT_FAILURE; |
303 | } |
304 | } |
305 | if (!(opt & OPT_SILENT)) { |
306 | printf("%u ", (unsigned)plist->pid); |
307 | } |
308 | } |
309 | plist = plist->next; |
310 | } while (plist); |
311 | |
312 | if (!(opt & (OPT_SILENT))) { |
313 | bb_putchar('\n'); |
314 | } |
315 | |
316 | return exitcode; |
317 | } |