1 /* vi: set sw=4 ts=4: */
3 * tiny fuser implementation
5 * Copyright 2004 Tony J. White
7 * May be distributed under the conditions of the
8 * GNU Library General Public License
15 #define OPTION_STRING "mks64"
19 OPT_SILENT = (1 << 2),
24 typedef struct inode_list {
25 struct inode_list *next;
30 typedef struct pid_list {
31 struct pid_list *next;
35 static dev_t find_socket_dev(void)
37 int fd = socket(AF_INET, SOCK_DGRAM, 0);
40 int r = fstat(fd, &buf);
48 static int file_to_dev_inode(const char *filename, dev_t *dev, ino_t *inode)
51 if (stat(filename, &f_stat))
53 *inode = f_stat.st_ino;
58 static char *parse_net_arg(const char *arg, unsigned *port)
60 char path[20], tproto[5];
62 if (sscanf(arg, "%u/%4s", port, tproto) != 2)
64 sprintf(path, "/proc/net/%s", tproto);
65 if (access(path, R_OK) != 0)
67 return xstrdup(tproto);
70 static pid_list *add_pid(pid_list *plist, pid_t pid)
72 pid_list *curr = plist;
73 while (curr != NULL) {
78 curr = xmalloc(sizeof(pid_list));
84 static inode_list *add_inode(inode_list *ilist, dev_t dev, ino_t inode)
86 inode_list *curr = ilist;
87 while (curr != NULL) {
88 if (curr->inode == inode && curr->dev == dev)
92 curr = xmalloc(sizeof(inode_list));
99 static inode_list *scan_proc_net(const char *proto,
100 unsigned port, inode_list *ilist)
102 char path[20], line[MAX_LINE + 1];
105 long long uint64_inode;
109 tmp_dev = find_socket_dev();
111 sprintf(path, "/proc/net/%s", proto);
112 f = fopen_for_read(path);
116 while (fgets(line, MAX_LINE, f)) {
118 if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
119 "%*x:%*x %*x %*d %*d %llu",
120 addr, &tmp_port, &uint64_inode) == 3
122 int len = strlen(addr);
123 if (len == 8 && (option_mask32 & OPT_IP6))
125 if (len > 8 && (option_mask32 & OPT_IP4))
127 if (tmp_port == port) {
128 tmp_inode = uint64_inode;
129 ilist = add_inode(ilist, tmp_dev, tmp_inode);
137 static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
140 if (ilist->dev == dev) {
141 if (option_mask32 & OPT_MOUNT)
143 if (ilist->inode == inode)
151 static pid_list *scan_pid_maps(const char *fname, pid_t pid,
152 inode_list *ilist, pid_list *plist)
155 char line[MAX_LINE + 1];
158 long long uint64_inode;
161 file = fopen_for_read(fname);
164 while (fgets(line, MAX_LINE, file)) {
165 if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
167 inode = uint64_inode;
168 if (major == 0 && minor == 0 && inode == 0)
170 dev = makedev(major, minor);
171 if (search_dev_inode(ilist, dev, inode))
172 plist = add_pid(plist, pid);
178 static pid_list *scan_link(const char *lname, pid_t pid,
179 inode_list *ilist, pid_list *plist)
184 if (!file_to_dev_inode(lname, &dev, &inode))
186 if (search_dev_inode(ilist, dev, inode))
187 plist = add_pid(plist, pid);
191 static pid_list *scan_dir_links(const char *dname, pid_t pid,
192 inode_list *ilist, pid_list *plist)
201 while ((de = readdir(d)) != NULL) {
202 lname = concat_subpath_file(dname, de->d_name);
205 plist = scan_link(lname, pid, ilist, plist);
212 /* NB: does chdir internally */
213 static pid_list *scan_proc_pids(inode_list *ilist)
221 d = opendir("/proc");
226 while ((de = readdir(d)) != NULL) {
227 pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
230 if (chdir(de->d_name) < 0)
232 plist = scan_link("cwd", pid, ilist, plist);
233 plist = scan_link("exe", pid, ilist, plist);
234 plist = scan_link("root", pid, ilist, plist);
235 plist = scan_dir_links("fd", pid, ilist, plist);
236 plist = scan_dir_links("lib", pid, ilist, plist);
237 plist = scan_dir_links("mmap", pid, ilist, plist);
238 plist = scan_pid_maps("maps", pid, ilist, plist);
245 static int print_pid_list(pid_list *plist)
247 while (plist != NULL) {
248 printf("%u ", (unsigned)plist->pid);
255 static int kill_pid_list(pid_list *plist, int sig)
257 pid_t mypid = getpid();
260 while (plist != NULL) {
261 if (plist->pid != mypid) {
262 if (kill(plist->pid, sig) != 0) {
263 bb_perror_msg("kill pid %u", (unsigned)plist->pid);
272 int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
273 int fuser_main(int argc UNUSED_PARAM, char **argv)
285 fuser [options] FILEs or PORT/PROTOs
286 Find processes which use FILEs or PORTs
287 -m Find processes which use same fs as FILEs
288 -4 Search only IPv4 space
289 -6 Search only IPv6 space
290 -s Silent: just exit with 0 if any processes are found
291 -k Kill found processes (otherwise display PIDs)
292 -SIGNAL Signal to send (default: TERM)
294 /* Handle -SIGNAL. Oh my... */
301 if (arg[1] == '-' && arg[2] == '\0') /* "--" */
303 if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
304 continue; /* it's "-4" or "-6" */
305 opt = get_signum(&arg[1]);
308 /* "-SIGNAL" option found. Remove it and bail out */
317 opt = getopt32(argv, OPTION_STRING);
323 char *proto = parse_net_arg(*pp, &port);
324 if (proto) { /* PORT/PROTO */
325 ilist = scan_proc_net(proto, port, ilist);
328 if (!file_to_dev_inode(*pp, &dev, &inode))
329 bb_perror_msg_and_die("can't open %s", *pp);
330 ilist = add_inode(ilist, dev, inode);
335 plist = scan_proc_pids(ilist); /* changes dir to "/proc" */
340 if (opt & OPT_KILL) {
341 success = kill_pid_list(plist, killsig);
342 } else if (!(opt & OPT_SILENT)) {
343 success = print_pid_list(plist);
345 return (success != 1); /* 0 == success */