source: MondoRescue/branches/3.3/mindi-busybox/procps/pwdx.c@ 3909

/* vi: set sw=4 ts=4: */
/*
 * pwdx implementation for busybox
 *
 * Copyright (c) 2004 Nicholas Miell
 * ported from procps by Pere Orga <gotrunks@gmail.com> 2011
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */

//config:config PWDX
//config:   bool "pwdx"
//config:   default y
//config:   help
//config:     Report current working directory of a process

//applet:IF_PWDX(APPLET(pwdx, BB_DIR_USR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_PWDX) += pwdx.o

//usage:#define pwdx_trivial_usage
//usage:       "PID..."
//usage:#define pwdx_full_usage "\n\n"
//usage:       "Show current directory for PIDs"

#include "libbb.h"

int pwdx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pwdx_main(int argc UNUSED_PARAM, char **argv)
{
    opt_complementary = "-1";
    getopt32(argv, "");
    argv += optind;

    do {
        char buf[sizeof("/proc/%u/cwd") + sizeof(int)*3];
        unsigned pid;
        char *s;
        char *arg = *argv;

        // Allowed on the command line:
        // /proc/NUM
        // NUM
        if (is_prefixed_with(arg, "/proc/"))
            arg += 6;

        pid = bb_strtou(arg, NULL, 10);
        if (errno)
            bb_error_msg_and_die("invalid process id: '%s'", arg);

        sprintf(buf, "/proc/%u/cwd", pid);

        s = xmalloc_readlink(buf);
        // "pwdx /proc/1" says "/proc/1: DIR", not "1: DIR"
        printf("%s: %s\n", *argv, s ? s : strerror(errno == ENOENT ? ESRCH : errno));
        free(s);
    } while (*++argv);

    return EXIT_SUCCESS;
}