1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * pwdx implementation for busybox
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4 | *
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5 | * Copyright (c) 2004 Nicholas Miell
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6 | * ported from procps by Pere Orga <gotrunks@gmail.com> 2011
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7 | *
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8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | //config:config PWDX
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12 | //config: bool "pwdx"
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13 | //config: default y
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14 | //config: help
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15 | //config: Report current working directory of a process
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16 |
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17 | //applet:IF_PWDX(APPLET(pwdx, BB_DIR_USR_BIN, BB_SUID_DROP))
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18 |
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19 | //kbuild:lib-$(CONFIG_PWDX) += pwdx.o
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20 |
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21 | //usage:#define pwdx_trivial_usage
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22 | //usage: "PID..."
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23 | //usage:#define pwdx_full_usage "\n\n"
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24 | //usage: "Show current directory for PIDs"
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25 |
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26 | #include "libbb.h"
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27 |
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28 | int pwdx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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29 | int pwdx_main(int argc UNUSED_PARAM, char **argv)
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30 | {
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31 | opt_complementary = "-1";
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32 | getopt32(argv, "");
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33 | argv += optind;
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34 |
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35 | do {
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36 | char buf[sizeof("/proc/%u/cwd") + sizeof(int)*3];
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37 | unsigned pid;
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38 | char *s;
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39 | char *arg = *argv;
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40 |
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41 | // Allowed on the command line:
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42 | // /proc/NUM
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43 | // NUM
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44 | if (is_prefixed_with(arg, "/proc/"))
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45 | arg += 6;
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46 |
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47 | pid = bb_strtou(arg, NULL, 10);
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48 | if (errno)
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49 | bb_error_msg_and_die("invalid process id: '%s'", arg);
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50 |
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51 | sprintf(buf, "/proc/%u/cwd", pid);
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52 |
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53 | s = xmalloc_readlink(buf);
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54 | // "pwdx /proc/1" says "/proc/1: DIR", not "1: DIR"
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55 | printf("%s: %s\n", *argv, s ? s : strerror(errno == ENOENT ? ESRCH : errno));
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56 | free(s);
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57 | } while (*++argv);
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58 |
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59 | return EXIT_SUCCESS;
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60 | }
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