1 /* List dynamic shared objects linked into given process.
2 Copyright (C) 2011, 2012 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
35 #include <sys/ptrace.h>
41 /* Global variables. */
42 extern char *program_invocation_short_name;
43 #define PACKAGE _libc_intl_domainname
45 /* External functions. */
46 extern void *xmalloc (size_t n)
47 __attribute_malloc__ __attribute_alloc_size (1);
48 extern void *xrealloc (void *o, size_t n)
49 __attribute_malloc__ __attribute_alloc_size (2);
51 /* Name and version of program. */
52 static void print_version (FILE *stream, struct argp_state *state);
53 void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
55 /* Function to print some extra text in the help message. */
56 static char *more_help (int key, const char *text, void *input);
58 /* Definitions of arguments for argp functions. */
59 static const struct argp_option options[] =
61 { NULL, 0, NULL, 0, NULL }
64 /* Short description of program. */
65 static const char doc[] = N_("\
66 List dynamic shared objects loaded into process.");
68 /* Strings for arguments in help texts. */
69 static const char args_doc[] = N_("PID");
71 /* Prototype for option handler. */
72 static error_t parse_opt (int key, char *arg, struct argp_state *state);
74 /* Data structure to communicate with argp functions. */
75 static struct argp argp =
77 options, parse_opt, args_doc, doc, NULL, more_help, NULL
80 // File descriptor of /proc/*/mem file.
83 /* Name of the executable */
86 /* Local functions. */
87 static int get_process_info (int dfd, long int pid);
91 main (int argc, char *argv[])
93 /* Parse and process arguments. */
95 argp_parse (&argp, argc, argv, 0, &remaining, NULL);
97 if (remaining != argc - 1)
100 gettext ("Exactly one parameter with process ID required.\n"));
101 argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
105 assert (sizeof (pid_t) == sizeof (int)
106 || sizeof (pid_t) == sizeof (long int));
109 long int pid = strtol (argv[remaining], &endp, 10);
110 if (pid < 0 || (pid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
111 || (sizeof (pid_t) < sizeof (pid) && pid > INT_MAX))
112 error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
115 /* Determine the program name. */
116 char buf[7 + 3 * sizeof (pid)];
117 snprintf (buf, sizeof (buf), "/proc/%lu", pid);
118 int dfd = open (buf, O_RDONLY | O_DIRECTORY);
120 error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf);
122 size_t exesize = 1024;
126 exe = alloca (exesize);
128 while ((nexe = readlinkat (dfd, "exe", exe, exesize)) == exesize)
129 extend_alloca (exe, exesize, 2 * exesize);
131 exe = (char *) "<program name undetermined>";
135 /* Stop all threads since otherwise the list of loaded modules might
136 change while we are reading it. */
140 struct thread_list *next;
141 } *thread_list = NULL;
143 int taskfd = openat (dfd, "task", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
145 error (EXIT_FAILURE, errno, gettext ("cannot open %s/task"), buf);
146 DIR *dir = fdopendir (taskfd);
148 error (EXIT_FAILURE, errno, gettext ("cannot prepare reading %s/task"),
152 while ((d = readdir64 (dir)) != NULL)
154 if (! isdigit (d->d_name[0]))
158 long int tid = strtol (d->d_name, &endp, 10);
159 if (tid < 0 || (tid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
160 || (sizeof (pid_t) < sizeof (pid) && tid > INT_MAX))
161 error (EXIT_FAILURE, 0, gettext ("invalid thread ID '%s'"),
164 if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0)
166 /* There might be a race between reading the directory and
167 threads terminating. Ignore errors attaching to unknown
168 threads unless this is the main thread. */
169 if (errno == ESRCH && tid != pid)
172 error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
176 struct thread_list *newp = alloca (sizeof (*newp));
178 newp->next = thread_list;
184 int status = get_process_info (dfd, pid);
186 assert (thread_list != NULL);
189 ptrace (PTRACE_DETACH, thread_list->tid, NULL, NULL);
190 thread_list = thread_list->next;
192 while (thread_list != NULL);
200 /* Handle program arguments. */
202 parse_opt (int key, char *arg, struct argp_state *state)
207 return ARGP_ERR_UNKNOWN;
213 /* Print bug-reporting information in the help message. */
215 more_help (int key, const char *text, void *input)
220 case ARGP_KEY_HELP_EXTRA:
221 /* We print some extra information. */
222 if (asprintf (&tp, gettext ("\
223 For bug reporting instructions, please see:\n\
224 %s.\n"), REPORT_BUGS_TO) < 0)
230 return (char *) text;
233 /* Print the version information. */
235 print_version (FILE *stream, struct argp_state *state)
237 fprintf (stream, "pldd %s%s\n", PKGVERSION, VERSION);
238 fprintf (stream, gettext ("\
239 Copyright (C) %s Free Software Foundation, Inc.\n\
240 This is free software; see the source for copying conditions. There is NO\n\
241 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
243 fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
254 get_process_info (int dfd, long int pid)
256 memfd = openat (dfd, "mem", O_RDONLY);
260 int fd = openat (dfd, "exe", O_RDONLY);
264 error (0, errno, gettext ("cannot get information about process %lu"),
269 char e_ident[EI_NIDENT];
270 if (read (fd, e_ident, EI_NIDENT) != EI_NIDENT)
275 if (memcmp (e_ident, ELFMAG, SELFMAG) != 0)
277 error (0, 0, gettext ("process %lu is no ELF program"), pid);
281 fd = openat (dfd, "auxv", O_RDONLY);
285 size_t auxv_size = 0;
290 auxv = xrealloc (auxv, auxv_size);
292 ssize_t n = pread (fd, auxv, auxv_size, 0);
305 if (e_ident[EI_CLASS] == ELFCLASS32)
306 retval = find_maps32 (pid, auxv, auxv_size);
308 retval = find_maps64 (pid, auxv, auxv_size);