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function old new delta fuser_main 918 871 -47 Signed-off-by: Maksym Kryzhanovskyy <xmaks@email.cz> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
318 lines
5.9 KiB
C
318 lines
5.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tiny fuser implementation
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*
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* Copyright 2004 Tony J. White
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#define MAX_LINE 255
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#define OPTION_STRING "mks64"
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enum {
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OPT_MOUNT = (1 << 0),
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OPT_KILL = (1 << 1),
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OPT_SILENT = (1 << 2),
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OPT_IP6 = (1 << 3),
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OPT_IP4 = (1 << 4),
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};
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typedef struct inode_list {
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struct inode_list *next;
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ino_t inode;
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dev_t dev;
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} inode_list;
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typedef struct pid_list {
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struct pid_list *next;
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pid_t pid;
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} pid_list;
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struct globals {
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pid_list *pid_list_head;
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inode_list *inode_list_head;
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { } while (0)
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static void add_pid(const pid_t pid)
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{
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pid_list **curr = &G.pid_list_head;
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while (*curr) {
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if ((*curr)->pid == pid)
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return;
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curr = &(*curr)->next;
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}
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*curr = xzalloc(sizeof(pid_list));
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(*curr)->pid = pid;
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}
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static void add_inode(const struct stat *st)
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{
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inode_list **curr = &G.inode_list_head;
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while (*curr) {
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if ((*curr)->dev == st->st_dev
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&& (*curr)->inode == st->st_ino
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) {
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return;
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}
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curr = &(*curr)->next;
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}
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*curr = xzalloc(sizeof(inode_list));
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(*curr)->dev = st->st_dev;
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(*curr)->inode = st->st_ino;
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}
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static void scan_proc_net(const char *path, unsigned port)
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{
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char line[MAX_LINE + 1];
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long long uint64_inode;
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unsigned tmp_port;
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FILE *f;
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struct stat st;
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int fd;
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/* find socket dev */
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st.st_dev = 0;
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd >= 0) {
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fstat(fd, &st);
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close(fd);
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}
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f = fopen_for_read(path);
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if (!f)
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return;
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while (fgets(line, MAX_LINE, f)) {
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char addr[68];
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if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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"%*x:%*x %*x %*d %*d %llu",
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addr, &tmp_port, &uint64_inode) == 3
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) {
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int len = strlen(addr);
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if (len == 8 && (option_mask32 & OPT_IP6))
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continue;
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if (len > 8 && (option_mask32 & OPT_IP4))
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continue;
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if (tmp_port == port) {
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st.st_ino = uint64_inode;
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add_inode(&st);
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}
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}
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}
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fclose(f);
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}
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static int search_dev_inode(const struct stat *st)
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{
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inode_list *ilist = G.inode_list_head;
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while (ilist) {
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if (ilist->dev == st->st_dev) {
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if (option_mask32 & OPT_MOUNT)
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return 1;
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if (ilist->inode == st->st_ino)
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return 1;
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}
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ilist = ilist->next;
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}
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return 0;
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}
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static void scan_pid_maps(const char *fname, pid_t pid)
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{
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FILE *file;
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char line[MAX_LINE + 1];
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int major, minor;
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long long uint64_inode;
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struct stat st;
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file = fopen_for_read(fname);
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if (!file)
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return;
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while (fgets(line, MAX_LINE, file)) {
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if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
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continue;
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st.st_ino = uint64_inode;
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if (major == 0 && minor == 0 && st.st_ino == 0)
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continue;
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st.st_dev = makedev(major, minor);
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if (search_dev_inode(&st))
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add_pid(pid);
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}
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fclose(file);
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}
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static void scan_link(const char *lname, pid_t pid)
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{
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struct stat st;
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if (stat(lname, &st) >= 0) {
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if (search_dev_inode(&st))
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add_pid(pid);
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}
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}
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static void scan_dir_links(const char *dname, pid_t pid)
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{
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DIR *d;
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struct dirent *de;
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char *lname;
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d = opendir(dname);
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if (!d)
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return;
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while ((de = readdir(d)) != NULL) {
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lname = concat_subpath_file(dname, de->d_name);
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if (lname == NULL)
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continue;
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scan_link(lname, pid);
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free(lname);
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}
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closedir(d);
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}
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/* NB: does chdir internally */
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static void scan_proc_pids(void)
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{
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DIR *d;
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struct dirent *de;
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pid_t pid;
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xchdir("/proc");
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d = opendir("/proc");
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if (!d)
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return;
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while ((de = readdir(d)) != NULL) {
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pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
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if (errno)
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continue;
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if (chdir(de->d_name) < 0)
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continue;
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scan_link("cwd", pid);
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scan_link("exe", pid);
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scan_link("root", pid);
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scan_dir_links("fd", pid);
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scan_dir_links("lib", pid);
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scan_dir_links("mmap", pid);
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scan_pid_maps("maps", pid);
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xchdir("/proc");
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}
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closedir(d);
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}
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int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fuser_main(int argc UNUSED_PARAM, char **argv)
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{
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pid_list *plist;
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pid_t mypid;
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char **pp;
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struct stat st;
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unsigned port;
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int opt;
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int exitcode;
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int killsig;
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/*
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fuser [OPTIONS] FILE or PORT/PROTO
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Find processes which use FILEs or PORTs
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-m Find processes which use same fs as FILEs
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-4 Search only IPv4 space
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-6 Search only IPv6 space
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-s Don't display PIDs
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-k Kill found processes
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-SIGNAL Signal to send (default: KILL)
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*/
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/* Handle -SIGNAL. Oh my... */
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killsig = SIGKILL; /* yes, the default is not SIGTERM */
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pp = argv;
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while (*++pp) {
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char *arg = *pp;
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if (arg[0] != '-')
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continue;
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if (arg[1] == '-' && arg[2] == '\0') /* "--" */
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break;
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if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
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continue; /* it's "-4" or "-6" */
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opt = get_signum(&arg[1]);
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if (opt < 0)
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continue;
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/* "-SIGNAL" option found. Remove it and bail out */
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killsig = opt;
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do {
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pp[0] = arg = pp[1];
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pp++;
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} while (arg);
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break;
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}
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opt_complementary = "-1"; /* at least one param */
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opt = getopt32(argv, OPTION_STRING);
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argv += optind;
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pp = argv;
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while (*pp) {
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/* parse net arg */
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char path[20], tproto[5];
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if (sscanf(*pp, "%u/%4s", &port, tproto) != 2)
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goto file;
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sprintf(path, "/proc/net/%s", tproto);
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if (access(path, R_OK) != 0) { /* PORT/PROTO */
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scan_proc_net(path, port);
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} else { /* FILE */
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file:
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xstat(*pp, &st);
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add_inode(&st);
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}
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pp++;
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}
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scan_proc_pids(); /* changes dir to "/proc" */
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mypid = getpid();
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plist = G.pid_list_head;
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while (1) {
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if (!plist)
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return EXIT_FAILURE;
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if (plist->pid != mypid)
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break;
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plist = plist->next;
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}
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exitcode = EXIT_SUCCESS;
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do {
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if (plist->pid != mypid) {
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if (opt & OPT_KILL) {
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if (kill(plist->pid, killsig) != 0) {
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bb_perror_msg("kill pid %u", (unsigned)plist->pid);
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exitcode = EXIT_FAILURE;
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}
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}
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if (!(opt & OPT_SILENT)) {
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printf("%u ", (unsigned)plist->pid);
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}
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}
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plist = plist->next;
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} while (plist);
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if (!(opt & (OPT_SILENT))) {
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bb_putchar('\n');
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}
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return exitcode;
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}
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