1/* 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//config:config LSOF 10//config: bool "lsof (3.4 kb)" 11//config: default y 12//config: help 13//config: Show open files in the format of: 14//config: PID <TAB> /path/to/executable <TAB> /path/to/opened/file 15 16//applet:IF_LSOF(APPLET(lsof, BB_DIR_USR_BIN, BB_SUID_DROP)) 17 18//kbuild:lib-$(CONFIG_LSOF) += lsof.o 19 20//usage:#define lsof_trivial_usage 21//usage: "" 22//usage:#define lsof_full_usage "\n\n" 23//usage: "Show all open files" 24 25#include "libbb.h" 26 27/* 28 * Examples of "standard" lsof output: 29 * 30 * COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME 31 * init 1 root cwd DIR 8,5 4096 2 / 32 * init 1 root rtd DIR 8,5 4096 2 / 33 * init 1 root txt REG 8,5 872400 63408 /app/busybox-1.19.2/busybox 34 * rpc.portm 1064 root mem REG 8,5 43494 47451 /app/glibc-2.11/lib/libnss_files-2.11.so 35 * rpc.portm 1064 root 3u IPv4 2178 UDP *:111 36 * rpc.portm 1064 root 4u IPv4 1244 TCP *:111 (LISTEN) 37 * runsvdir 1116 root 0r CHR 1,3 1214 /dev/null 38 * runsvdir 1116 root 1w CHR 1,3 1214 /dev/null 39 * runsvdir 1116 root 2w CHR 1,3 1214 /dev/null 40 * runsvdir 1116 root 3r DIR 8,6 1560 58359 /.local/var/service 41 * gpm 1128 root 4u unix 0xffff88007c09ccc0 1302 /dev/gpmctl 42 */ 43 44int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 45int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) 46{ 47 procps_status_t *proc = NULL; 48 49 while ((proc = procps_scan(proc, PSSCAN_PID|PSSCAN_EXE)) != NULL) { 50 char name[sizeof("/proc/%u/fd/0123456789") + sizeof(int)*3]; 51 unsigned baseofs; 52 DIR *d_fd; 53 char *fdlink; 54 struct dirent *entry; 55 56 if (getpid() == proc->pid) 57 continue; 58 59 baseofs = sprintf(name, "/proc/%u/fd/", proc->pid); 60 d_fd = opendir(name); 61 if (d_fd) { 62 while ((entry = readdir(d_fd)) != NULL) { 63 /* Skip entries '.' and '..' (and any hidden file) */ 64 if (entry->d_name[0] == '.') 65 continue; 66 67 safe_strncpy(name + baseofs, entry->d_name, 10); 68 if ((fdlink = xmalloc_readlink(name)) != NULL) { 69 printf("%d\t%s\t%s\n", proc->pid, proc->exe, fdlink); 70 free(fdlink); 71 } 72 } 73 closedir(d_fd); 74 } 75 } 76 77 return EXIT_SUCCESS; 78} 79