Mercurial > hg > truffle
annotate agent/src/os/linux/ps_proc.c @ 3228:b95c8fa99e8c
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author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Wed, 20 Jul 2011 18:50:39 +0200 |
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children | 2394a89e89f4 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #include <stdio.h> | |
26 #include <stdlib.h> | |
27 #include <string.h> | |
28 #include <errno.h> | |
29 #include <sys/ptrace.h> | |
30 #include "libproc_impl.h" | |
31 | |
32 #if defined(x86_64) && !defined(amd64) | |
33 #define amd64 1 | |
34 #endif | |
35 | |
36 #ifndef __WALL | |
37 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h | |
38 #endif | |
39 | |
40 // This file has the libproc implementation specific to live process | |
41 // For core files, refer to ps_core.c | |
42 | |
43 static inline uintptr_t align(uintptr_t ptr, size_t size) { | |
44 return (ptr & ~(size - 1)); | |
45 } | |
46 | |
47 // --------------------------------------------- | |
48 // ptrace functions | |
49 // --------------------------------------------- | |
50 | |
51 // read "size" bytes of data from "addr" within the target process. | |
52 // unlike the standard ptrace() function, process_read_data() can handle | |
53 // unaligned address - alignment check, if required, should be done | |
54 // before calling process_read_data. | |
55 | |
56 static bool process_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
57 long rslt; | |
58 size_t i, words; | |
59 uintptr_t end_addr = addr + size; | |
60 uintptr_t aligned_addr = align(addr, sizeof(long)); | |
61 | |
62 if (aligned_addr != addr) { | |
63 char *ptr = (char *)&rslt; | |
64 errno = 0; | |
65 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
66 if (errno) { | |
67 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
68 return false; | |
69 } | |
70 for (; aligned_addr != addr; aligned_addr++, ptr++); | |
71 for (; ((intptr_t)aligned_addr % sizeof(long)) && aligned_addr < end_addr; | |
72 aligned_addr++) | |
73 *(buf++) = *(ptr++); | |
74 } | |
75 | |
76 words = (end_addr - aligned_addr) / sizeof(long); | |
77 | |
78 // assert((intptr_t)aligned_addr % sizeof(long) == 0); | |
79 for (i = 0; i < words; i++) { | |
80 errno = 0; | |
81 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
82 if (errno) { | |
83 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
84 return false; | |
85 } | |
86 *(long *)buf = rslt; | |
87 buf += sizeof(long); | |
88 aligned_addr += sizeof(long); | |
89 } | |
90 | |
91 if (aligned_addr != end_addr) { | |
92 char *ptr = (char *)&rslt; | |
93 errno = 0; | |
94 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
95 if (errno) { | |
96 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
97 return false; | |
98 } | |
99 for (; aligned_addr != end_addr; aligned_addr++) | |
100 *(buf++) = *(ptr++); | |
101 } | |
102 return true; | |
103 } | |
104 | |
105 // null implementation for write | |
106 static bool process_write_data(struct ps_prochandle* ph, | |
107 uintptr_t addr, const char *buf , size_t size) { | |
108 return false; | |
109 } | |
110 | |
111 // "user" should be a pointer to a user_regs_struct | |
112 static bool process_get_lwp_regs(struct ps_prochandle* ph, pid_t pid, struct user_regs_struct *user) { | |
113 // we have already attached to all thread 'pid's, just use ptrace call | |
114 // to get regset now. Note that we don't cache regset upfront for processes. | |
115 // Linux on x86 and sparc are different. On x86 ptrace(PTRACE_GETREGS, ...) | |
116 // uses pointer from 4th argument and ignores 3rd argument. On sparc it uses | |
117 // pointer from 3rd argument and ignores 4th argument | |
118 #if defined(sparc) || defined(sparcv9) | |
119 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, addr, data) | |
120 #else | |
121 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, data, addr) | |
122 #endif | |
123 | |
1990 | 124 #if defined(_LP64) && defined(PTRACE_GETREGS64) |
0 | 125 #define PTRACE_GETREGS_REQ PTRACE_GETREGS64 |
1990 | 126 #elif defined(PTRACE_GETREGS) |
127 #define PTRACE_GETREGS_REQ PTRACE_GETREGS | |
128 #elif defined(PT_GETREGS) | |
129 #define PTRACE_GETREGS_REQ PT_GETREGS | |
0 | 130 #endif |
131 | |
132 #ifdef PTRACE_GETREGS_REQ | |
133 if (ptrace_getregs(PTRACE_GETREGS_REQ, pid, user, NULL) < 0) { | |
134 print_debug("ptrace(PTRACE_GETREGS, ...) failed for lwp %d\n", pid); | |
135 return false; | |
136 } | |
137 return true; | |
138 #else | |
139 print_debug("ptrace(PTRACE_GETREGS, ...) not supported\n"); | |
140 return false; | |
141 #endif | |
142 | |
143 } | |
144 | |
145 // attach to a process/thread specified by "pid" | |
146 static bool ptrace_attach(pid_t pid) { | |
147 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { | |
148 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); | |
149 return false; | |
150 } else { | |
151 int ret; | |
152 int status; | |
153 do { | |
154 // Wait for debuggee to stop. | |
155 ret = waitpid(pid, &status, 0); | |
156 if (ret == -1 && errno == ECHILD) { | |
157 // try cloned process. | |
158 ret = waitpid(pid, &status, __WALL); | |
159 } | |
160 if (ret >= 0) { | |
161 if (WIFSTOPPED(status)) { | |
162 // Debuggee stopped. | |
163 return true; | |
164 } else { | |
165 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status); | |
166 return false; | |
167 } | |
168 } else { | |
169 switch (errno) { | |
170 case EINTR: | |
171 continue; | |
172 break; | |
173 case ECHILD: | |
174 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid); | |
175 break; | |
176 case EINVAL: | |
177 print_debug("waitpid() failed. Invalid options argument.\n"); | |
178 break; | |
179 default: | |
180 print_debug("waitpid() failed. Unexpected error %d\n",errno); | |
181 } | |
182 return false; | |
183 } | |
184 } while(true); | |
185 } | |
186 } | |
187 | |
188 // ------------------------------------------------------- | |
189 // functions for obtaining library information | |
190 // ------------------------------------------------------- | |
191 | |
192 /* | |
193 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring | |
194 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_. | |
195 * RETURN VALUE: total number of substrings (always <= _n_) | |
196 * NOTE: string _str_ is modified if _delim_!=_new_delim_ | |
197 */ | |
198 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim) | |
199 { | |
200 int i; | |
201 for(i = 0; i < n; i++) ptrs[i] = NULL; | |
202 if (str == NULL || n < 1 ) return 0; | |
203 | |
204 i = 0; | |
205 | |
206 // skipping leading blanks | |
207 while(*str&&*str==delim) str++; | |
208 | |
209 while(*str&&i<n){ | |
210 ptrs[i++] = str; | |
211 while(*str&&*str!=delim) str++; | |
212 while(*str&&*str==delim) *(str++) = new_delim; | |
213 } | |
214 | |
215 return i; | |
216 } | |
217 | |
218 /* | |
219 * fgets without storing '\n' at the end of the string | |
220 */ | |
221 static char * fgets_no_cr(char * buf, int n, FILE *fp) | |
222 { | |
223 char * rslt = fgets(buf, n, fp); | |
224 if (rslt && buf && *buf){ | |
225 char *p = strchr(buf, '\0'); | |
226 if (*--p=='\n') *p='\0'; | |
227 } | |
228 return rslt; | |
229 } | |
230 | |
231 // callback for read_thread_info | |
232 static bool add_new_thread(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { | |
233 return add_thread_info(ph, pthread_id, lwp_id) != NULL; | |
234 } | |
235 | |
236 static bool read_lib_info(struct ps_prochandle* ph) { | |
237 char fname[32]; | |
238 char buf[256]; | |
239 FILE *fp = NULL; | |
240 | |
241 sprintf(fname, "/proc/%d/maps", ph->pid); | |
242 fp = fopen(fname, "r"); | |
243 if (fp == NULL) { | |
244 print_debug("can't open /proc/%d/maps file\n", ph->pid); | |
245 return false; | |
246 } | |
247 | |
248 while(fgets_no_cr(buf, 256, fp)){ | |
249 char * word[6]; | |
250 int nwords = split_n_str(buf, 6, word, ' ', '\0'); | |
251 if (nwords > 5 && find_lib(ph, word[5]) == false) { | |
252 intptr_t base; | |
253 lib_info* lib; | |
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254 #ifdef _LP64 |
0 | 255 sscanf(word[0], "%lx", &base); |
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256 #else |
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257 sscanf(word[0], "%x", &base); |
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258 #endif |
0 | 259 if ((lib = add_lib_info(ph, word[5], (uintptr_t)base)) == NULL) |
260 continue; // ignore, add_lib_info prints error | |
261 | |
262 // we don't need to keep the library open, symtab is already | |
263 // built. Only for core dump we need to keep the fd open. | |
264 close(lib->fd); | |
265 lib->fd = -1; | |
266 } | |
267 } | |
268 fclose(fp); | |
269 return true; | |
270 } | |
271 | |
272 // detach a given pid | |
273 static bool ptrace_detach(pid_t pid) { | |
274 if (pid && ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0) { | |
275 print_debug("ptrace(PTRACE_DETACH, ..) failed for %d\n", pid); | |
276 return false; | |
277 } else { | |
278 return true; | |
279 } | |
280 } | |
281 | |
282 // detach all pids of a ps_prochandle | |
283 static void detach_all_pids(struct ps_prochandle* ph) { | |
284 thread_info* thr = ph->threads; | |
285 while (thr) { | |
286 ptrace_detach(thr->lwp_id); | |
287 thr = thr->next; | |
288 } | |
289 } | |
290 | |
291 static void process_cleanup(struct ps_prochandle* ph) { | |
292 detach_all_pids(ph); | |
293 } | |
294 | |
295 static ps_prochandle_ops process_ops = { | |
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296 .release= process_cleanup, |
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297 .p_pread= process_read_data, |
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298 .p_pwrite= process_write_data, |
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299 .get_lwp_regs= process_get_lwp_regs |
0 | 300 }; |
301 | |
302 // attach to the process. One and only one exposed stuff | |
303 struct ps_prochandle* Pgrab(pid_t pid) { | |
304 struct ps_prochandle* ph = NULL; | |
305 thread_info* thr = NULL; | |
306 | |
307 if ( (ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle))) == NULL) { | |
308 print_debug("can't allocate memory for ps_prochandle\n"); | |
309 return NULL; | |
310 } | |
311 | |
312 if (ptrace_attach(pid) != true) { | |
313 free(ph); | |
314 return NULL; | |
315 } | |
316 | |
317 // initialize ps_prochandle | |
318 ph->pid = pid; | |
319 | |
320 // initialize vtable | |
321 ph->ops = &process_ops; | |
322 | |
323 // read library info and symbol tables, must do this before attaching threads, | |
324 // as the symbols in the pthread library will be used to figure out | |
325 // the list of threads within the same process. | |
326 read_lib_info(ph); | |
327 | |
328 // read thread info | |
329 read_thread_info(ph, add_new_thread); | |
330 | |
331 // attach to the threads | |
332 thr = ph->threads; | |
333 while (thr) { | |
334 // don't attach to the main thread again | |
335 if (ph->pid != thr->lwp_id && ptrace_attach(thr->lwp_id) != true) { | |
336 // even if one attach fails, we get return NULL | |
337 Prelease(ph); | |
338 return NULL; | |
339 } | |
340 thr = thr->next; | |
341 } | |
342 return ph; | |
343 } |