fuser: code shrink, fixing default signal, exitcode and PID display
Defult signal is KILL, not TERM. We used to not display PIDs with -k but without -s, but upstream (fuser from PSmisc 22.7) still shows PIDs. Filtering out of our own PID was buggy. function old new delta fuser_main 669 918 +249 search_dev_inode 67 74 +7 add_pid 38 39 +1 scan_pid_maps 225 222 -3 add_inode 91 88 -3 packed_usage 27047 27039 -8 scan_dir_links 102 76 -26 scan_link 78 46 -32 file_to_dev_inode 64 - -64 scan_proc_net 307 - -307 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 3/5 up/down: 257/-443) Total: -186 bytes Signed-off-by: Maksym Kryzhanovskyy <xmaks@email.cz> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Maksym Kryzhanovskyy
Denys Vlasenko
parent
8391c4800c
commit
fef9ee7072
@ -1474,9 +1474,9 @@
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"\n -m Find processes which use same fs as FILEs" \
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"\n -4 Search only IPv4 space" \
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"\n -6 Search only IPv6 space" \
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"\n -s Silent: just exit with 0 if any processes are found" \
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"\n -k Kill found processes (otherwise display PIDs)" \
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"\n -SIGNAL Signal to send (default: TERM)" \
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"\n -s Don't display PIDs" \
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"\n -k Kill found processes" \
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"\n -SIGNAL Signal to send (default: KILL)" \
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#define getenforce_trivial_usage NOUSAGE_STR
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#define getenforce_full_usage ""
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258
procps/fuser.c
258
procps/fuser.c
@ -31,6 +31,15 @@ typedef struct pid_list {
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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 dev_t find_socket_dev(void)
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{
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int fd = socket(AF_INET, SOCK_DGRAM, 0);
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@ -44,16 +53,6 @@ static dev_t find_socket_dev(void)
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return 0;
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}
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static int file_to_dev_inode(const char *filename, dev_t *dev, ino_t *inode)
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{
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struct stat f_stat;
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if (stat(filename, &f_stat))
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return 0;
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*inode = f_stat.st_ino;
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*dev = f_stat.st_dev;
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return 1;
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}
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static char *parse_net_arg(const char *arg, unsigned *port)
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{
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char path[20], tproto[5];
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@ -63,54 +62,54 @@ static char *parse_net_arg(const char *arg, unsigned *port)
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sprintf(path, "/proc/net/%s", tproto);
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if (access(path, R_OK) != 0)
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return NULL;
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return xstrdup(tproto);
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return xstrdup(path);
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}
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static pid_list *add_pid(pid_list *plist, pid_t pid)
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static void add_pid(const pid_t pid)
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{
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pid_list *curr = plist;
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while (curr != NULL) {
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if (curr->pid == pid)
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return plist;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(pid_list));
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curr->pid = pid;
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curr->next = plist;
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return curr;
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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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static inode_list *add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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{
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inode_list *curr = ilist;
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while (curr != NULL) {
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if (curr->inode == inode && curr->dev == dev)
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return ilist;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(inode_list));
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curr->dev = dev;
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curr->inode = inode;
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curr->next = ilist;
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return curr;
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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 inode_list *scan_proc_net(const char *proto,
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unsigned port, inode_list *ilist)
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static void add_inode(const struct stat *st)
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{
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char path[20], line[MAX_LINE + 1];
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ino_t tmp_inode;
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dev_t tmp_dev;
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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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tmp_dev = find_socket_dev();
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st.st_dev = find_socket_dev();
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sprintf(path, "/proc/net/%s", proto);
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f = fopen_for_read(path);
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if (!f)
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return ilist;
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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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@ -124,22 +123,23 @@ static inode_list *scan_proc_net(const char *proto,
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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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tmp_inode = uint64_inode;
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ilist = add_inode(ilist, tmp_dev, tmp_inode);
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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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return ilist;
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}
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static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
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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 == dev) {
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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 == inode)
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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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@ -147,48 +147,42 @@ static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
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return 0;
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}
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static pid_list *scan_pid_maps(const char *fname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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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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ino_t inode;
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long long uint64_inode;
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dev_t dev;
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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 plist;
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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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inode = uint64_inode;
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if (major == 0 && minor == 0 && inode == 0)
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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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dev = makedev(major, minor);
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if (search_dev_inode(ilist, dev, inode))
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plist = add_pid(plist, pid);
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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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return plist;
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}
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static pid_list *scan_link(const char *lname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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static void scan_link(const char *lname, pid_t pid)
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{
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ino_t inode;
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dev_t dev;
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struct stat st;
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if (!file_to_dev_inode(lname, &dev, &inode))
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return plist;
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if (search_dev_inode(ilist, dev, inode))
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plist = add_pid(plist, pid);
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return plist;
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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 pid_list *scan_dir_links(const char *dname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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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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@ -196,102 +190,73 @@ static pid_list *scan_dir_links(const char *dname, pid_t pid,
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d = opendir(dname);
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if (!d)
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return plist;
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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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plist = scan_link(lname, pid, ilist, plist);
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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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return plist;
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}
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/* NB: does chdir internally */
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static pid_list *scan_proc_pids(inode_list *ilist)
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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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pid_list *plist;
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xchdir("/proc");
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d = opendir("/proc");
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if (!d)
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return NULL;
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return;
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plist = NULL;
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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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plist = scan_link("cwd", pid, ilist, plist);
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plist = scan_link("exe", pid, ilist, plist);
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plist = scan_link("root", pid, ilist, plist);
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plist = scan_dir_links("fd", pid, ilist, plist);
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plist = scan_dir_links("lib", pid, ilist, plist);
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plist = scan_dir_links("mmap", pid, ilist, plist);
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plist = scan_pid_maps("maps", pid, ilist, plist);
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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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return plist;
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}
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static int print_pid_list(pid_list *plist)
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{
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while (plist != NULL) {
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printf("%u ", (unsigned)plist->pid);
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plist = plist->next;
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}
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bb_putchar('\n');
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return 1;
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}
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static int kill_pid_list(pid_list *plist, int sig)
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{
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pid_t mypid = getpid();
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int success = 1;
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while (plist != NULL) {
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if (plist->pid != mypid) {
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if (kill(plist->pid, sig) != 0) {
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bb_perror_msg("kill pid %u", (unsigned)plist->pid);
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success = 0;
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}
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}
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plist = plist->next;
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}
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return success;
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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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inode_list *ilist;
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pid_t mypid;
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char **pp;
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dev_t dev;
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ino_t inode;
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struct stat st;
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unsigned port;
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int opt;
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int success;
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int exitcode;
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int killsig;
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/*
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fuser [options] FILEs or PORT/PROTOs
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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 Silent: just exit with 0 if any processes are found
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-k Kill found processes (otherwise display PIDs)
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-SIGNAL Signal to send (default: TERM)
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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 = SIGTERM;
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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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@ -313,33 +278,54 @@ Find processes which use FILEs or PORTs
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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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ilist = NULL;
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pp = argv;
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while (*pp) {
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char *proto = parse_net_arg(*pp, &port);
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if (proto) { /* PORT/PROTO */
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ilist = scan_proc_net(proto, port, ilist);
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free(proto);
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char *path = parse_net_arg(*pp, &port);
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if (path) { /* PORT/PROTO */
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scan_proc_net(path, port);
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free(path);
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} else { /* FILE */
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if (!file_to_dev_inode(*pp, &dev, &inode))
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bb_perror_msg_and_die("can't open '%s'", *pp);
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ilist = add_inode(ilist, dev, inode);
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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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plist = scan_proc_pids(ilist); /* changes dir to "/proc" */
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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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success = 1;
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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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success = kill_pid_list(plist, killsig);
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} else if (!(opt & OPT_SILENT)) {
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success = print_pid_list(plist);
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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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return (success != 1); /* 0 == success */
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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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