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60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* pwdx implementation for busybox
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*
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* Copyright (c) 2004 Nicholas Miell
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* ported from procps by Pere Orga <gotrunks@gmail.com> 2011
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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 PWDX
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//config: bool "pwdx (3.7 kb)"
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//config: default y
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//config: help
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//config: Report current working directory of a process
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//applet:IF_PWDX(APPLET_NOFORK(pwdx, pwdx, BB_DIR_USR_BIN, BB_SUID_DROP, pwdx))
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//kbuild:lib-$(CONFIG_PWDX) += pwdx.o
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//usage:#define pwdx_trivial_usage
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//usage: "PID..."
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//usage:#define pwdx_full_usage "\n\n"
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//usage: "Show current directory for PIDs"
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#include "libbb.h"
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int pwdx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int pwdx_main(int argc UNUSED_PARAM, char **argv)
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{
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getopt32(argv, "^" "" "\0" "-1");
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argv += optind;
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do {
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char buf[sizeof("/proc/%u/cwd") + sizeof(int)*3];
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unsigned pid;
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char *s;
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char *arg = *argv;
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// Allowed on the command line:
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// /proc/NUM
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// NUM
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if (is_prefixed_with(arg, "/proc/"))
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arg += 6;
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pid = bb_strtou(arg, NULL, 10);
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if (errno)
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bb_error_msg_and_die("invalid process id: '%s'", arg);
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sprintf(buf, "/proc/%u/cwd", pid);
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/* NOFORK: only one alloc is allowed; must free */
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s = xmalloc_readlink(buf);
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// "pwdx /proc/1" says "/proc/1: DIR", not "1: DIR"
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printf("%s: %s\n", *argv, s ? s : strerror(errno == ENOENT ? ESRCH : errno));
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free(s);
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} while (*++argv);
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return EXIT_SUCCESS;
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}
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