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-rw-r--r-- | procps/pwdx.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/procps/pwdx.c b/procps/pwdx.c new file mode 100644 index 0000000..7818104 --- /dev/null +++ b/procps/pwdx.c @@ -0,0 +1,60 @@ +/* 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\n" + +#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 (strncmp(arg, "/proc/", 6) == 0) + 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; +} |