LXR busybox/procps/pwdx.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * pwdx implementation for busybox
   4 *
   5 * Copyright (c) 2004 Nicholas Miell
   6 * ported from procps by Pere Orga <gotrunks@gmail.com> 2011
   7 *
   8 * Licensed under GPLv2, see file LICENSE in this source tree.
   9 */
  10
  11//config:config PWDX
  12//config:       bool "pwdx"
  13//config:       default y
  14//config:       help
  15//config:         Report current working directory of a process
  16
  17//applet:IF_PWDX(APPLET(pwdx, BB_DIR_USR_BIN, BB_SUID_DROP))
  18
  19//kbuild:lib-$(CONFIG_PWDX) += pwdx.o
  20
  21//usage:#define pwdx_trivial_usage
  22//usage:       "PID..."
  23//usage:#define pwdx_full_usage "\n\n"
  24//usage:       "Show current directory for PIDs"
  25
  26#include "libbb.h"
  27
  28int pwdx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  29int pwdx_main(int argc UNUSED_PARAM, char **argv)
  30{
  31        opt_complementary = "-1";
  32        getopt32(argv, "");
  33        argv += optind;
  34
  35        do {
  36                char buf[sizeof("/proc/%u/cwd") + sizeof(int)*3];
  37                unsigned pid;
  38                char *s;
  39                char *arg = *argv;
  40
  41                // Allowed on the command line:
  42                // /proc/NUM
  43                // NUM
  44                if (is_prefixed_with(arg, "/proc/"))
  45                        arg += 6;
  46
  47                pid = bb_strtou(arg, NULL, 10);
  48                if (errno)
  49                        bb_error_msg_and_die("invalid process id: '%s'", arg);
  50
  51                sprintf(buf, "/proc/%u/cwd", pid);
  52
  53                s = xmalloc_readlink(buf);
  54                // "pwdx /proc/1" says "/proc/1: DIR", not "1: DIR"
  55                printf("%s: %s\n", *argv, s ? s : strerror(errno == ENOENT ? ESRCH : errno));
  56                free(s);
  57        } while (*++argv);
  58
  59        return EXIT_SUCCESS;
  60}
  61