79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini lsof implementation for busybox
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*
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* Copyright (C) 2012 by Sven Oliver 'SvOlli' Moll <svolli@svolli.de>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config LSOF
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//config: bool "lsof (3.6 kb)"
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//config: default y
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//config: help
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//config: Show open files in the format of:
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//config: PID <TAB> /path/to/executable <TAB> /path/to/opened/file
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//applet:IF_LSOF(APPLET(lsof, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_LSOF) += lsof.o
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//usage:#define lsof_trivial_usage
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//usage: ""
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//usage:#define lsof_full_usage "\n\n"
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//usage: "Show all open files"
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#include "libbb.h"
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/*
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* Examples of "standard" lsof output:
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*
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* COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
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* init 1 root cwd DIR 8,5 4096 2 /
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* init 1 root rtd DIR 8,5 4096 2 /
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* init 1 root txt REG 8,5 872400 63408 /app/busybox-1.19.2/busybox
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* rpc.portm 1064 root mem REG 8,5 43494 47451 /app/glibc-2.11/lib/libnss_files-2.11.so
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* rpc.portm 1064 root 3u IPv4 2178 UDP *:111
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* rpc.portm 1064 root 4u IPv4 1244 TCP *:111 (LISTEN)
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* runsvdir 1116 root 0r CHR 1,3 1214 /dev/null
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* runsvdir 1116 root 1w CHR 1,3 1214 /dev/null
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* runsvdir 1116 root 2w CHR 1,3 1214 /dev/null
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* runsvdir 1116 root 3r DIR 8,6 1560 58359 /.local/var/service
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* gpm 1128 root 4u unix 0xffff88007c09ccc0 1302 /dev/gpmctl
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*/
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int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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procps_status_t *proc = NULL;
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while ((proc = procps_scan(proc, PSSCAN_PID|PSSCAN_EXE)) != NULL) {
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char name[sizeof("/proc/%u/fd/0123456789") + sizeof(int)*3];
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unsigned baseofs;
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DIR *d_fd;
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char *fdlink;
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struct dirent *entry;
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if (getpid() == proc->pid)
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continue;
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baseofs = sprintf(name, "/proc/%u/fd/", proc->pid);
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d_fd = opendir(name);
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if (d_fd) {
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while ((entry = readdir(d_fd)) != NULL) {
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/* Skip entries '.' and '..' (and any hidden file) */
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if (entry->d_name[0] == '.')
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continue;
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safe_strncpy(name + baseofs, entry->d_name, 10);
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if ((fdlink = xmalloc_readlink(name)) != NULL) {
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printf("%d\t%s\t%s\n", proc->pid, proc->exe, fdlink);
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free(fdlink);
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}
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}
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closedir(d_fd);
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}
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}
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return EXIT_SUCCESS;
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}
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