1 /*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifdef INCLUDE_SA_ATTACH
26
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <signal.h>
31 #include <errno.h>
32 #include <elf.h>
33 #include <sys/types.h>
34 #include <sys/wait.h>
35 #include <sys/ptrace.h>
36 #include <sys/uio.h>
37 #include "libproc_impl.h"
38
39 #if defined(x86_64) && !defined(amd64)
40 #define amd64 1
41 #endif
42
43 #ifndef __WALL
44 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h
45 #endif
46
47 // This file has the libproc implementation specific to live process
48 // For core files, refer to ps_core.c
49
50 static inline uintptr_t align(uintptr_t ptr, size_t size) {
51 return (ptr & ~(size - 1));
52 }
53
54 // ---------------------------------------------
55 // ptrace functions
56 // ---------------------------------------------
203 break;
204 case ECHILD:
205 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid);
206 break;
207 case EINVAL:
208 print_debug("waitpid() failed. Invalid options argument.\n");
209 break;
210 default:
211 print_debug("waitpid() failed. Unexpected error %d\n",errno);
212 break;
213 }
214 return false;
215 }
216 }
217 }
218
219 // attach to a process/thread specified by "pid"
220 static bool ptrace_attach(pid_t pid, char* err_buf, size_t err_buf_len) {
221 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) {
222 char buf[200];
223 char* msg = strerror_r(errno, buf, sizeof(buf));
224 snprintf(err_buf, err_buf_len, "ptrace(PTRACE_ATTACH, ..) failed for %d: %s", pid, msg);
225 print_debug("%s\n", err_buf);
226 return false;
227 } else {
228 return ptrace_waitpid(pid);
229 }
230 }
231
232 // -------------------------------------------------------
233 // functions for obtaining library information
234 // -------------------------------------------------------
235
236 /*
237 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring
238 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_.
239 * RETURN VALUE: total number of substrings (always <= _n_)
240 * NOTE: string _str_ is modified if _delim_!=_new_delim_
241 */
242 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim)
243 {
244 int i;
245 for(i = 0; i < n; i++) ptrs[i] = NULL;
384 print_debug("%s\n", err_buf);
385 return NULL;
386 }
387
388 if (ptrace_attach(pid, err_buf, err_buf_len) != true) {
389 free(ph);
390 return NULL;
391 }
392
393 // initialize ps_prochandle
394 ph->pid = pid;
395
396 // initialize vtable
397 ph->ops = &process_ops;
398
399 // read library info and symbol tables, must do this before attaching threads,
400 // as the symbols in the pthread library will be used to figure out
401 // the list of threads within the same process.
402 read_lib_info(ph);
403
404 // read thread info
405 read_thread_info(ph, add_new_thread);
406
407 // attach to the threads
408 thr = ph->threads;
409 while (thr) {
410 // don't attach to the main thread again
411 if (ph->pid != thr->lwp_id && ptrace_attach(thr->lwp_id, err_buf, err_buf_len) != true) {
412 // even if one attach fails, we get return NULL
413 Prelease(ph);
414 return NULL;
415 }
416 thr = thr->next;
417 }
418 return ph;
419 }
420
421 #endif // INCLUDE_SA_ATTACH
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1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <signal.h>
29 #include <errno.h>
30 #include <elf.h>
31 #include <sys/types.h>
32 #include <sys/wait.h>
33 #include <sys/ptrace.h>
34 #include <sys/uio.h>
35 #ifndef INCLUDE_SA_ATTACH
36 #include <dirent.h>
37 #endif
38 #include "libproc_impl.h"
39
40 #if defined(x86_64) && !defined(amd64)
41 #define amd64 1
42 #endif
43
44 #ifndef __WALL
45 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h
46 #endif
47
48 // This file has the libproc implementation specific to live process
49 // For core files, refer to ps_core.c
50
51 static inline uintptr_t align(uintptr_t ptr, size_t size) {
52 return (ptr & ~(size - 1));
53 }
54
55 // ---------------------------------------------
56 // ptrace functions
57 // ---------------------------------------------
204 break;
205 case ECHILD:
206 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid);
207 break;
208 case EINVAL:
209 print_debug("waitpid() failed. Invalid options argument.\n");
210 break;
211 default:
212 print_debug("waitpid() failed. Unexpected error %d\n",errno);
213 break;
214 }
215 return false;
216 }
217 }
218 }
219
220 // attach to a process/thread specified by "pid"
221 static bool ptrace_attach(pid_t pid, char* err_buf, size_t err_buf_len) {
222 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) {
223 char buf[200];
224 if (strerror_r(errno, buf, sizeof(buf) == 0)) {
225 snprintf(err_buf, err_buf_len,
226 "ptrace(PTRACE_ATTACH, ..) failed for %d: %s", pid, buf);
227 print_debug("%s\n", err_buf);
228 }
229 return false;
230 } else {
231 return ptrace_waitpid(pid);
232 }
233 }
234
235 // -------------------------------------------------------
236 // functions for obtaining library information
237 // -------------------------------------------------------
238
239 /*
240 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring
241 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_.
242 * RETURN VALUE: total number of substrings (always <= _n_)
243 * NOTE: string _str_ is modified if _delim_!=_new_delim_
244 */
245 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim)
246 {
247 int i;
248 for(i = 0; i < n; i++) ptrs[i] = NULL;
387 print_debug("%s\n", err_buf);
388 return NULL;
389 }
390
391 if (ptrace_attach(pid, err_buf, err_buf_len) != true) {
392 free(ph);
393 return NULL;
394 }
395
396 // initialize ps_prochandle
397 ph->pid = pid;
398
399 // initialize vtable
400 ph->ops = &process_ops;
401
402 // read library info and symbol tables, must do this before attaching threads,
403 // as the symbols in the pthread library will be used to figure out
404 // the list of threads within the same process.
405 read_lib_info(ph);
406
407 #ifdef INCLUDE_SA_ATTACH
408 // read thread info
409 read_thread_info(ph, add_new_thread);
410
411 // attach to the threads
412 thr = ph->threads;
413 while (thr) {
414 // don't attach to the main thread again
415 if (pid != thr->lwp_id && ptrace_attach(thr->lwp_id, err_buf, err_buf_len) != true) {
416 // even if one attach fails, we get return NULL
417 Prelease(ph);
418 return NULL;
419 }
420 thr = thr->next;
421 }
422 #else
423 DIR *dir = NULL;
424 struct dirent *ent = NULL;
425 char taskpath[80];
426
427 // Find the lwpids to attach to by traversing the /proc/<pid>/task/ directory,
428 // and attach to those.
429 snprintf (taskpath, sizeof (taskpath), "/proc/%ld/task", (unsigned long) pid);
430 if ((dir = opendir(taskpath)) != NULL) {
431 while ((ent = readdir (dir)) != NULL) {
432 unsigned long lwp;
433
434 if ((lwp = strtoul (ent->d_name, NULL, 10)) != 0) {
435 add_new_thread (ph, 0, lwp);
436
437 // Don't attach to the main thread again
438 if (lwp == (unsigned long) pid) {
439 continue;
440 }
441
442 if (ptrace_attach(lwp, err_buf, err_buf_len) != true) {
443 Prelease(ph);
444 closedir (dir);
445 return NULL;
446 }
447 }
448 }
449 } else {
450 print_debug("Could not open /proc/%ld/task.\n", (unsigned long) pid);
451 Prelease(ph);
452 return NULL;
453 }
454
455 closedir (dir);
456 #endif
457 return ph;
458 }
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