1 /* vi: set sw=4 ts=4: */
3 * tiny fuser implementation
5 * Copyright 2004 Tony J. White
7 * Licensed under GPLv2, see file LICENSE in this tarball for details.
14 #define OPTION_STRING "mks64"
18 OPT_SILENT = (1 << 2),
23 typedef struct inode_list {
24 struct inode_list *next;
29 typedef struct pid_list {
30 struct pid_list *next;
34 static dev_t find_socket_dev(void)
36 int fd = socket(AF_INET, SOCK_DGRAM, 0);
39 int r = fstat(fd, &buf);
47 static int file_to_dev_inode(const char *filename, dev_t *dev, ino_t *inode)
50 if (stat(filename, &f_stat))
52 *inode = f_stat.st_ino;
57 static char *parse_net_arg(const char *arg, unsigned *port)
59 char path[20], tproto[5];
61 if (sscanf(arg, "%u/%4s", port, tproto) != 2)
63 sprintf(path, "/proc/net/%s", tproto);
64 if (access(path, R_OK) != 0)
66 return xstrdup(tproto);
69 static pid_list *add_pid(pid_list *plist, pid_t pid)
71 pid_list *curr = plist;
72 while (curr != NULL) {
77 curr = xmalloc(sizeof(pid_list));
83 static inode_list *add_inode(inode_list *ilist, dev_t dev, ino_t inode)
85 inode_list *curr = ilist;
86 while (curr != NULL) {
87 if (curr->inode == inode && curr->dev == dev)
91 curr = xmalloc(sizeof(inode_list));
98 static inode_list *scan_proc_net(const char *proto,
99 unsigned port, inode_list *ilist)
101 char path[20], line[MAX_LINE + 1];
104 long long uint64_inode;
108 tmp_dev = find_socket_dev();
110 sprintf(path, "/proc/net/%s", proto);
111 f = fopen_for_read(path);
115 while (fgets(line, MAX_LINE, f)) {
117 if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
118 "%*x:%*x %*x %*d %*d %llu",
119 addr, &tmp_port, &uint64_inode) == 3
121 int len = strlen(addr);
122 if (len == 8 && (option_mask32 & OPT_IP6))
124 if (len > 8 && (option_mask32 & OPT_IP4))
126 if (tmp_port == port) {
127 tmp_inode = uint64_inode;
128 ilist = add_inode(ilist, tmp_dev, tmp_inode);
136 static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
139 if (ilist->dev == dev) {
140 if (option_mask32 & OPT_MOUNT)
142 if (ilist->inode == inode)
150 static pid_list *scan_pid_maps(const char *fname, pid_t pid,
151 inode_list *ilist, pid_list *plist)
154 char line[MAX_LINE + 1];
157 long long uint64_inode;
160 file = fopen_for_read(fname);
163 while (fgets(line, MAX_LINE, file)) {
164 if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
166 inode = uint64_inode;
167 if (major == 0 && minor == 0 && inode == 0)
169 dev = makedev(major, minor);
170 if (search_dev_inode(ilist, dev, inode))
171 plist = add_pid(plist, pid);
177 static pid_list *scan_link(const char *lname, pid_t pid,
178 inode_list *ilist, pid_list *plist)
183 if (!file_to_dev_inode(lname, &dev, &inode))
185 if (search_dev_inode(ilist, dev, inode))
186 plist = add_pid(plist, pid);
190 static pid_list *scan_dir_links(const char *dname, pid_t pid,
191 inode_list *ilist, pid_list *plist)
200 while ((de = readdir(d)) != NULL) {
201 lname = concat_subpath_file(dname, de->d_name);
204 plist = scan_link(lname, pid, ilist, plist);
211 /* NB: does chdir internally */
212 static pid_list *scan_proc_pids(inode_list *ilist)
220 d = opendir("/proc");
225 while ((de = readdir(d)) != NULL) {
226 pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
229 if (chdir(de->d_name) < 0)
231 plist = scan_link("cwd", pid, ilist, plist);
232 plist = scan_link("exe", pid, ilist, plist);
233 plist = scan_link("root", pid, ilist, plist);
234 plist = scan_dir_links("fd", pid, ilist, plist);
235 plist = scan_dir_links("lib", pid, ilist, plist);
236 plist = scan_dir_links("mmap", pid, ilist, plist);
237 plist = scan_pid_maps("maps", pid, ilist, plist);
244 static int print_pid_list(pid_list *plist)
246 while (plist != NULL) {
247 printf("%u ", (unsigned)plist->pid);
254 static int kill_pid_list(pid_list *plist, int sig)
256 pid_t mypid = getpid();
259 while (plist != NULL) {
260 if (plist->pid != mypid) {
261 if (kill(plist->pid, sig) != 0) {
262 bb_perror_msg("kill pid %u", (unsigned)plist->pid);
271 int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
272 int fuser_main(int argc UNUSED_PARAM, char **argv)
284 fuser [options] FILEs or PORT/PROTOs
285 Find processes which use FILEs or PORTs
286 -m Find processes which use same fs as FILEs
287 -4 Search only IPv4 space
288 -6 Search only IPv6 space
289 -s Silent: just exit with 0 if any processes are found
290 -k Kill found processes (otherwise display PIDs)
291 -SIGNAL Signal to send (default: TERM)
293 /* Handle -SIGNAL. Oh my... */
300 if (arg[1] == '-' && arg[2] == '\0') /* "--" */
302 if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
303 continue; /* it's "-4" or "-6" */
304 opt = get_signum(&arg[1]);
307 /* "-SIGNAL" option found. Remove it and bail out */
316 opt = getopt32(argv, OPTION_STRING);
322 char *proto = parse_net_arg(*pp, &port);
323 if (proto) { /* PORT/PROTO */
324 ilist = scan_proc_net(proto, port, ilist);
327 if (!file_to_dev_inode(*pp, &dev, &inode))
328 bb_perror_msg_and_die("can't open '%s'", *pp);
329 ilist = add_inode(ilist, dev, inode);
334 plist = scan_proc_pids(ilist); /* changes dir to "/proc" */
339 if (opt & OPT_KILL) {
340 success = kill_pid_list(plist, killsig);
341 } else if (!(opt & OPT_SILENT)) {
342 success = print_pid_list(plist);
344 return (success != 1); /* 0 == success */