blob: 7e0ffa4e5ecb6035ee0bbaec973b5f93eed5b145 [file] [log] [blame]
Sven Oliver Moll1c12b672012-04-01 16:23:23 +02001/* vi: set sw=4 ts=4: */
2/*
3 * Mini lsof implementation for busybox
4 *
5 * Copyright (C) 2012 by Sven Oliver 'SvOlli' Moll <svolli@svolli.de>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9
10//config:config LSOF
11//config: bool "lsof"
12//config: default y
13//config: help
14//config: Show open files in the format of:
15//config: PID <TAB> /path/to/executable <TAB> /path/to/opened/file
16
17//applet:IF_LSOF(APPLET(lsof, BB_DIR_USR_BIN, BB_SUID_DROP))
18
19//kbuild:lib-$(CONFIG_LSOF) += lsof.o
20
21//usage:#define lsof_trivial_usage
22//usage: ""
23//usage:#define lsof_full_usage "\n\n"
24//usage: "Show all open files"
25
26#include "libbb.h"
27
28/*
29 * Examples of "standard" lsof output:
30 *
31 * COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
32 * init 1 root cwd DIR 8,5 4096 2 /
33 * init 1 root rtd DIR 8,5 4096 2 /
34 * init 1 root txt REG 8,5 872400 63408 /app/busybox-1.19.2/busybox
35 * rpc.portm 1064 root mem REG 8,5 43494 47451 /app/glibc-2.11/lib/libnss_files-2.11.so
36 * rpc.portm 1064 root 3u IPv4 2178 UDP *:111
37 * rpc.portm 1064 root 4u IPv4 1244 TCP *:111 (LISTEN)
38 * runsvdir 1116 root 0r CHR 1,3 1214 /dev/null
39 * runsvdir 1116 root 1w CHR 1,3 1214 /dev/null
40 * runsvdir 1116 root 2w CHR 1,3 1214 /dev/null
41 * runsvdir 1116 root 3r DIR 8,6 1560 58359 /.local/var/service
42 * gpm 1128 root 4u unix 0xffff88007c09ccc0 1302 /dev/gpmctl
43 */
44
45int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
46int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
47{
48 procps_status_t *proc = NULL;
49
50 while ((proc = procps_scan(proc, PSSCAN_PID|PSSCAN_EXE)) != NULL) {
51 char name[sizeof("/proc/%u/fd/0123456789") + sizeof(int)*3];
52 unsigned baseofs;
53 DIR *d_fd;
54 char *fdlink;
55 struct dirent *entry;
56
57 if (getpid() == proc->pid)
58 continue;
59
60 baseofs = sprintf(name, "/proc/%u/fd/", proc->pid);
61 d_fd = opendir(name);
62 if (d_fd) {
63 while ((entry = readdir(d_fd)) != NULL) {
64 if (entry->d_type == DT_LNK) {
65 safe_strncpy(name + baseofs, entry->d_name, 10);
66 fdlink = xmalloc_readlink(name);
67 printf("%d\t%s\t%s\n", proc->pid, proc->exe, fdlink);
68 free(fdlink);
69 }
70 }
71 closedir(d_fd);
72 }
73 }
74
75 return EXIT_SUCCESS;
76}