LXR busybox/procps/lsof.c

   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