lsof: new applet

   text    data     bss     dec     hex filename
    221       0       0     221      dd lsof.o

Signed-off-by: Sven Oliver Moll <busybox@svol.li>
Signed-off-by: souf <souf_oued@yahoo.fr>
Signed-off-by: Tito Ragusa <farmatito@tiscali.it>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/procps/lsof.c b/procps/lsof.c
new file mode 100644 (file)
index 0000000..7e0ffa4
--- /dev/null
+++ b/procps/lsof.c
@@ -0,0 +1,76 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini lsof implementation for busybox
+ *
+ * Copyright (C) 2012 by Sven Oliver 'SvOlli' Moll <svolli@svolli.de>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//config:config LSOF
+//config:      bool "lsof"
+//config:      default y
+//config:      help
+//config:        Show open files in the format of:
+//config:        PID <TAB> /path/to/executable <TAB> /path/to/opened/file
+
+//applet:IF_LSOF(APPLET(lsof, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_LSOF) += lsof.o
+
+//usage:#define lsof_trivial_usage
+//usage:       ""
+//usage:#define lsof_full_usage "\n\n"
+//usage:       "Show all open files"
+
+#include "libbb.h"
+
+/*
+ * Examples of "standard" lsof output:
+ *
+ * COMMAND    PID USER   FD   TYPE             DEVICE     SIZE       NODE NAME
+ * init         1 root  cwd    DIR                8,5     4096          2 /
+ * init         1 root  rtd    DIR                8,5     4096          2 /
+ * init         1 root  txt    REG                8,5   872400      63408 /app/busybox-1.19.2/busybox
+ * rpc.portm 1064 root  mem    REG                8,5    43494      47451 /app/glibc-2.11/lib/libnss_files-2.11.so
+ * rpc.portm 1064 root    3u  IPv4               2178                 UDP *:111
+ * rpc.portm 1064 root    4u  IPv4               1244                 TCP *:111 (LISTEN)
+ * runsvdir  1116 root    0r   CHR                1,3                1214 /dev/null
+ * runsvdir  1116 root    1w   CHR                1,3                1214 /dev/null
+ * runsvdir  1116 root    2w   CHR                1,3                1214 /dev/null
+ * runsvdir  1116 root    3r   DIR                8,6     1560      58359 /.local/var/service
+ * gpm       1128 root    4u  unix 0xffff88007c09ccc0                1302 /dev/gpmctl
+ */
+
+int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+       procps_status_t *proc = NULL;
+
+       while ((proc = procps_scan(proc, PSSCAN_PID|PSSCAN_EXE)) != NULL) {
+               char name[sizeof("/proc/%u/fd/0123456789") + sizeof(int)*3];
+               unsigned baseofs;
+               DIR *d_fd;
+               char *fdlink;
+               struct dirent *entry;
+
+               if (getpid() == proc->pid)
+                       continue;
+
+               baseofs = sprintf(name, "/proc/%u/fd/", proc->pid);
+               d_fd = opendir(name);
+               if (d_fd) {
+                       while ((entry = readdir(d_fd)) != NULL) {
+                               if (entry->d_type == DT_LNK) {
+                                       safe_strncpy(name + baseofs, entry->d_name, 10);
+                                       fdlink = xmalloc_readlink(name);
+                                       printf("%d\t%s\t%s\n", proc->pid, proc->exe, fdlink);
+                                       free(fdlink);
+                               }
+                       }
+                       closedir(d_fd);
+               }
+       }
+
+       return EXIT_SUCCESS;
+}